TestMethodforElectricalSafetyof InformationTechnologyEquipment TTAStandard Enactedon:31Dec.1998...
Transcript of TestMethodforElectricalSafetyof InformationTechnologyEquipment TTAStandard Enactedon:31Dec.1998...
TTA Standard Enacted on : 31 Dec. 1998
TTAS.KO-09.0018/R1 Revised on : 23 Dec. 2004
Test Method for Electrical Safety of
Information Technology Equipment
Telecommunications TechnologyAssociation
TTA Standard Enacted on : 31 Dec. 1998
TTAS.KO-09.0018/R1 Revised on : 23 Dec. 2004
Test Method for Electrical Safety of
information Technology Equipment
Telecommunications TechnologyAssociation
TTAS.KO-09.0018/R1(2004.12)i
Preface
1. Summary
This test procedure provides measurement guide to comply with safety
requirements of information technology equipment.
2. References
2.1 International Standards(Recommendations) : None
2.2 Domestic Standards : None
2.3 Other : None
3. The Comparison of Other Standard (International Recommendation or Standard,
Domestic Standard, or etc.)
3.1 The Relation of International Standard (Recommendation) : None
3.2 Additional Items to International Standard (Recommendation) : None
4. Related Items to Intellectual Property Right
None
5. Related Items to Conformance Certification
Applicable to electrical safety requirements for information technology
equipment.
TTAS.KO-09.0018/R1(2004.12)ii
6. History
Version Issue Date Contents
1 1998. 12. 31 Established
2 2004. 12. 23. Revision
TTAS.KO-09.0018/R1(2004.12)iii
Contents
1. Test procedure and pre checking items ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 12. Input test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 43. Permanence of marking test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 64. Capacitor discharge test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 85. Humidity test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 116. Working voltage measurement‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 127. Limited current circuit test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 198. Ground continuity test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 249. Limited power source test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 2710. Strain relief test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 3211. Stability test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 3412. Impact test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 3613. Drop test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 3914. Direct plug-in moment test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 4115. Lithium battery reverse current test‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 4416. Heating test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 4717. Leakage test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 5618. Electric strength test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 6119. Abnormal test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 6920. Transformer abnormal test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 7621. Ball pressure test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 8122. TNV voltage measurement test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 8523. Telephone ringing signal test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 9024. Operating voltages generated Externally for TNV-2 and TNV-3 circuit ‥‥ 9925. Separation of the telecommunication network from earth ‥‥‥‥‥‥‥‥ 10226. Leakage current to a telecommunication network ‥‥‥‥‥‥‥‥‥‥‥‥ 10427. Impulse test for TNV circuits ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 10828. Electric strength for TNV circuits ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 11029. Flammability test for fire enclosures of movable and stationary equipment(exceeding 18kg) ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 113
TTAS.KO-09.0018/R1(2004.12)iv
30. Flammability test for fire enclosures of movable and stationary equipment(not exceeding 18kg) ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 116
31. High current arcing ignition test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 11932. Hot wire ignition test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 12233. Hot flaming oil test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 12534. Flammability test for classifying Materials V-0, V-1 or V-2 ‥‥‥‥‥‥ 12735. Flammability test for classifying HF-1, HF-2 or HBF ‥‥‥‥‥‥‥‥‥‥ 13236. Flammability test for classifying Materials HB ‥‥‥‥‥‥‥‥‥‥‥‥‥ 13737. Flammability test for classifying Materials 5V ‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 14038. Motor tests under abnormal concitions ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 14739. Ionizing radiation test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 15640. Test for thermal controls ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 158
Annex I Opening a court particulars from 2nd petal ‥‥‥‥‥‥‥‥‥‥‥‥ 161
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1. Test procedure and pre checking items
1.1 Test procedure
<Table 1-1> Test procedure table
Document check1. Operating manual2. Circuit diagram3. Parts list4. Specification of parts
Correspondingitem ofTechnical Standard
Structuraltest
Operatingtest
Partstest
1.5 Suitability test1.6 Label inspectionT3 Label endurancetest
T2 Input rating test 1.5 Non-approvedpart test
T15 Lithium battery testT39 X-ray emission test
3.2 Non-approved powercord test
T29 Fire-resistance over 18kgT30 Fire-resistance less than 18kgT31 Current Arc testT32 Heating wire ignition testT33 Ignition oil testT34 V-0,1,2 fire-resistanceT35 HF-1,2,HBF fire-resistanceT36 HB fire resistanceT37 5V fire resistance
3.1 Wiring inspection3.2 Power cordsuitability inspectionT10 Inspection of a powercord of fixed type3.3 Inspection ofterminal for power
2.1 Accessibility test2.2 Decision of insulation2.3 SELV circuit inspection2.6 Breaking device inspection2.7 Protecting device inspection2.8 Safety interlock inspection2.9 Insulation distance
inspection2.10 Inspection of connectionbetween equipments
T11 Stability test4.2 External force test4.2.6. Stress releasing test4.2.8 CRT test4.3 Structural testT12 Strong ball shock testT13 Drop testT14 Direct connecting test
T16 TemperatureIncreasing test
T17 Current leakage testT18 Withstanding voltage testT19 Abnormal state test
T6 Operating voltagemeasurementT5 Constant temperature &humidity testT4 Capacitancedischarging testT7 Current limit testT8 Ground continuity testT9 Power limit test
T20 Transformerabnormal state testT38 Motor abnormalstate testT40 Temperaturecontroller testT21 Ball pressure test
T22 TNV voltage measuring testT23 Telephone call signal testT24 TNV-2,-3 circuit testT25 Isolation test betweenelectrical communicationnetwork and groundT26 Current leakage test toelectric communication networkT27 TNV circuit impulse testT28 TNV circuit withstandingvoltage test
The numbers after T are the corresponding numbers of the table of contents of page 1,
and the underlined items are the tests that the equipments may be broken after the tests.
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1.2 Documents submission and EUT inspection.
<Table 1-2> Documents submission and EUT inspection items
No. Item Description and the related parts Check
1 Application formCheck if all information is filled out on the basisof a proper form.
2 Block diagram To check the outline of a product
3 Circuit diagramCircuit diagram of whole equipments (Inparticular, all parts related to a power supplyand TNV are prerequisite.
4 Product label Labels actually used - 3 sheets
5 Parts list
To list all of the replacement parts .1. All parts of power supply parts and motors,transformers.2. Parts for electric communication networkcircuit
6Certificate of parts(IEC, EN, KS, Authorized testinstitution)
1. Power cord2. Inlet3. Switch4. Fuse, fuse holder5. Thermal fuse6. X,Y capacitor7. Socket outlet8. Photocoupler9. Surge absorber device (varistor)10. CRT: cathode lay tube
7 Specification of parts
1. Discharging resistor2. Noise filter (winding type)3. Bridge diode4. FET5. Triac6. Windings7. Motors (including solenoid)8. Degaussing coil
8
List of plastic parts(manufacturer and model) andcertificate (in case of thecertified products)
1. Enclosure2. PCB (printed circuit board)3. Diverse insulated sheet4. Power connectors
9 Preparatory EUT and quantity
1. Finished products under test - Over 12. Power supply - Over 2 sets3. Transformer, impregnation over 2,
non-impregnation over 24. High voltage parts (EBT, high voltage cable)
- 1 Each5. Replacement parts for abnormal state test1) Fuse - Over 10 ea2) Bridge diode - 5 ea3) FET - 5 ea4) Other parts which can be damaged inopen/short circuit test - Over 5 ea (diodes, ICs,capacitors etc.)6. Motors - Over 2 ea
10Other documents (differentaccording to products)
* The above items are the listed-up parts which can be used for information and communication
products in general, items which are not related to EUT may be ignored.
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2. Input rating test
2.1 Corresponding Clause of Technical Standard : 1.6.1
2.2 Purpose of test
To test suitability of the given electric rating.
2.3 Test instruments
A. Voltage regulator : 1-250 VAC, 60 , 15A or equivalent
B. Power analyzer or VAW meter
C. Electronic load or additional loading equipment
D. Connecting cable
2.4 Test method and procedure
A. Apply the rated voltage and highest or lowest limit value of the rated
voltage to EUT respectively.
B. Set EUT condition at its worst (state of highest power consumption) in
normal operating state.
In case that there are extra slots or external terminals, test it in state that a
load is applied according to specification presented by a manufacturer.
Example :
- Monitor : Test in full white, max brightness, max contrast mode.
- Printer : Test in state that it continues to print out "H" letter.
- Facsimile : If it has COPY mode, continue to copy by using CCIT No3 Test
Form.
C. Measure input current and power consumption in normal state (after 10
minute in power-on state generally).
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2.5 Decision of suitability
Input current or power should not exceed 10 % of the rated current or power
in state of normal load.
2.6 Preparation of test certificate
<Table 2-1> Electric data
1.6 Table : Electric data (normal state) 1.1.
Fuse
#
Rated I or P
(A)or(W)U(V) P(W) I(mA) Ifuse(mA) Condition/State
F1 1.5A 220V 220W 1.0A 1.0ACCIT NO.3 used,sequential copy
A. Fuse# : Record part number of a fuse which is used in primary circuit of a power
supply (ex : F1).
B. Rated I or P : Record the rated current or the power consumption marked on a
label.
C. U(V) : Record the voltage applied in test
D. P(W) : Record the measured power consumption.
E. I(mA) : Record the measured input current.
F. Ifuse(mA) : If a fuse is used in primary circuit, measure and record the current
which flows through the fuse.
G. Condition/State : Record operating condition and state of an equipment used in the
test.
Fill with the recorded values as shown above in the corresponding blanks of a test
certificate of Clause 1.6.
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3. Permanence of marking test
3.1 Corresponding Clause of Technical Standard : 1.7.15
3.2 Purpose of test
To check solidity and endurance of label.
3.3 Test instruments
A. Stop Watch
B. Rag
C. Kerosene, water
* As a fatty solvent nucleic acid, kerosene is to be the one that maximum
volumetric contents of perfume is 0.1%, kauri-butanol is 29, primary boiling
point is around 65 , dry point is around 69 , and specific gravity is
around 0.7 Kg/I.
3.4 Test method and procedure
A. Rub the label with a wet rag for 15 seconds.
B. Rub the label again with a reg wet with kerosene for 15 seconds.
C. Check printing state of label.
3.5 Decision of suitability
A. After the test as mentioned above, it should be possible to read the label
finely and the label should not be separated and be curled up.
B. As a part which can be separated, if the trace can cause misunderstanding
by replacing the part, a label required in the technical standard should not
be attached in the part which can be separated.
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3.6 Preparation of test certificate
Record the test results in the corresponding blanks of a test certificate format
of Clause 1.7.15.
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4. Capacitor discharge test
4.1 Corresponding Clause of Technical Standard : 2.1.10
4.2 Purpose of test
To prevent the electric shock by the electric charge in a capacitance
connected to the power supply circuit at the point that external power source is
disconnected.
4.3 Test instruments
A. Storage oscilloscope (minimum input impedance : 10 )
B. Timer
C. Scope probe
D. Switch
4.4 Test method and procedure
Note : If the total line capacitance is less than 0.1 uF, this test is not
required.
A. In storage oscilloscope, a probe with impedance of at least over 10
should be used.
B. It is recommended to use the probe of 100:1 rather than 10:1 to minimize
influence from a specific equipment.
C. Test should be done in both states that the switch of an equipment is
turned on and off in consideration of the possibility that power is broken
wherever the switch of an equipment is.
D. Connect EUT as shown in the following figure.
E. Set the switch to position 1 and start EUT.
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F. Disconnect the switch from 1, and one second later, set the switch to
position 2 and then store the waveform in the Oscilloscope (measure at
Storage Mode of oscilloscope), and after one second, measure the peak
value.
G. Repeat F. procedure and find maximum peak value.
EUT
Oscilloscope
(Fig. 4-1) Block diagram of capacitor discharging test
4.5 Decision of suitability
A. Calculating method
If EUT has a discharging circuit whose time constant does not exceed the
value as follows, EUT is regarded as suitable.
- In case of A type plug connecting equipment : 1 second
- In case of permanent connecting equipment and B type plug connecting
equipment : 10 second
The time constant is the value that rms capacitance in uF is multiplied by
rms discharging resistance in M .Ω
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B. Actual measuring method
Voltage attenuates to 37% of the initial value at the time constant of 1.
Thus, the measured voltage should attenuate within 37% of the initial value
when the test is done on the basis of the above Clause 4.4.
* Reference : V = U exp-t/RC (U: peak voltage of line, R: discharging
resistance, C: line capacitance)
4.6 Preparation of test certificate.
Record the test result in the corresponding blanks of a test certificate format
of Clause 2.1.10.
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5. Humidity test
5.1 Corresponding Clause of Technical Standard : 2.2.2, 2.2.3, 5.3
5.2 Purpose of test
To measure the degree of humidity-proof regarding humidity inside of an
equipment.
5.3 Test instrument
A. Thermohygrostat
B. Withstanding voltage tester
5.4 Test method and procedure
A. Put EUT in a thermohygrostat.
B. Pull the measuring point out of the thermohygrostat for test withstanding
voltage.
C. Turn on the power switch of EUT for withstanding voltage test.
D. Set a thermohygrostat to relative humidity at 91%-95% and temperature at
20 -30 .
E. Keep EUT for 48 hours in the above state.
F. Do not apply voltage to parts or part assemblies during the test.
G. After 48 hours, put the EUT in the thermohygrostat or in a room at the
regulated temperature and conduct withstanding voltage test on the basis of
the related standard of Clause 5.3.
5.5 Decision of suitability
When the test is done on the basis of Clause 5.3 of Technical Standard,
insulation break-down should not happen.
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A. When test voltage is applied, if current increases rapidly beyond control, that
is, if insulation can not limit the current to less than a certain value, it is
regarded as insulation breakdown.
B. Corona discharge or instant flashover is not regarded as insulation
breakdown.
5.6 Preparation of test certificate
Record the test result in the corresponding blanks of a test certificate format of
Clause 2.2.2 and 2.2.3.
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6. Working voltage measurement
6.1 Corresponding Clause of Technical Standard : 2.2.7
6.2 Purpose of test
To utilize as fundamental material in test for creepage distance, space
distance, distance through insulation and withstanding voltage.
6.3 Test instruments
A. Voltage regulator : 1-250 VAC, 60 , 15 A or equivalent.
B. True rms meter
C. Storage oscilloscope
D. Power analyzer or VAW meter
E. Electronic load or additional load devices
F. Connecting cable
6.4 Test method and procedure
A. Connect EUT to the rated voltage or maximum value of rated voltage range.
B. Set EUT condition at its worst (highest power consumption) in state of
normal operating.
In case that there are extra slots or external terminals, test it in state that
maximum load is applied according to specification presented by a
manufacturer.
C. Assume that the conductor part, which is not grounded but accessible, is
grounded.
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D. If a transformer winding and other parts are not connected to a circuit,
which has potential regarding the ground, and are isolated, these are
regarded as grounded at the point that maximum operating voltage is
measured.
E. In case of dual insulation, the operating voltage of both ends of the
primary insulation is decided by assuming that the circuit of both ends of
the secondary insulation is shorted, and the inversion can be made. In case
of a transformer winding, it is assumed that the primary insulation or
secondary insulation is shorted at the highest voltage point at both ends of
other insulations.
F. In the insulation between 2 windings of a transformer, in consideration of
the external voltage which winding can be connected, maximum voltage
between arbitrary 2 points at both ends of 2 windings is used.
G. In insulation between the winding of a transformer and other parts,
maximum voltage between a point of the winding and other part is used.
H. In case that voltage is applied to the space distance of a primary circuit :
- DC voltage includes the peak value of the pulsating current which is
superposed.
- Non-repetitive transient phenomenon (ex : the one by air disturbance) is
disregarded.
- The voltage of ELV circuit , SELV circuit or TNV circuit is regarded as 0.
For proper application of Table 4 of Technical Standard :
- Regarding the repetitive peak voltage which exceeds the peak value of
main power supply, use repetitive maximum peak value.
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I. In case that the voltage is applied to the space distance of the secondary
circuit :
- DC current includes the peak value of the superposed ripple.
- In case of non-sine wave, use the peak value.
J. In case that voltage is applied to creepage distance :
- Use actual rms value or DC value.
- In case that DC value is used, the superposed ripple is disregarded.
- The condition of short time (ex : call signal of TNV circuit) is disregarded.
K. In case that voltage is appled to the withstanding voltage test :
In a operating voltage used to decide the withstanding test voltage regulated
in Clause 5.3 of Technical Standard, use DC current value for DC voltage
and use the peak value for other voltage.
L. Measuring position :
Except that insulation is inspected by other method as functional insulation
on the basis of Clause 2.2.6 of Technical Standard, measure and record the
voltages of the rms values (true rms) and peak values regarding all points
that insulation is required.
For example : Both ends of all parts which are close to primary circuit and
a ground, all parts and insulation which isolate primary circuit
from secondary circuit. (For example : In case of a transformer,
voltage is measured regarding all combination of primary pins
and secondary pins.)
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Description on the application of operating voltage
The voltage of ELV and SELV circuit should be considered if operating voltageregarding a creepage distance is decided. But these are ignored if operating voltageregarding space distance and withstanding voltage are decided.
Discharge through space depends on maximum voltage value (peak value). Short spacedistance can cause flashover when transient voltage is generated. The repetitive peakvalue is considered in Table 4 of Technical Standard. Creepage distance should not beshorter than space distance. Creepage distance depends on the voltage which showsskin effect for a long time. Accordingly, creepage distance depends on DC voltage andrms voltage, and is not affected by transient voltage and instant peak voltage.
Minimum operating voltage of a circuit
Nominal power source voltage is used for minimum operating voltage to decidegrounding with primary circuit or non-grounded metallic part, creepage distancebetween secondary circuits, or space distance and withstanding voltage test voltage.
For example, the above regulation is applied because a phase line and a neutral lineare connected crossly due to a socket outlet for a home, which wires are connectedwrongly, or terminals for power connection which are provided without polarity mark.
Actually, a neutral line is regarded as a phase line when accessibility to a switchingpower source and a space distance are decided.
Operating voltage between primary and secondary
When creepage distance between a point of primary circuit and a point of secondarycircuit is decided, the voltage between a point of primary circuit and a point ofsecondary circuit should be considered instead of maximum primary voltage which canbe generated between 2 points of primary circuit. For example, voltage differencebetween the collector of a switching transistor and (-)DC rail can be up to maximum 2times of the voltage between (+)DC rail and (-)DC rail. But, this voltage is not usedwhen creepage distance between primary circuit and secondary circuit is decided.Intension of this measurement is to find actual voltage that insulation system can coverfor the ground.In creepage distance between a collector and secondary circuit, or between otherarbitrary points of primary circuit and secondary circuit, rms (true rms) voltage betweenthese points should be used.
In case of space distance, additional space distance of Table 4 in Technical Standardbased on maximum repetitive peak voltage should be added to the space distancepresented in Table 3 of Technical Standard.
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Measuring instrument
In measuring rms voltage, a measuring instrument should be able to measure rms valueof sine wave and non-sine wave and should be suitable for high frequency of aswitching power supply.
Frequency Bandwidth : At least over 5 times of switching frequencyMemory of Oscilloscope : Minimum 3 cycles of the input voltage.Crest factor : Maximum peak value measuring capability = Maximum voltage measuring
range × Crest factor(ex : It is possible to measure maximum 750 V if crest factor is 3 and max range 250V meter.)
6.5 Decision of suitability
This test is used as fundamental materials for the test of creepage distance,
space distance, distance through insulation and withstanding voltage.
6.6 Preparation of test certificate
Example of operating voltage measurement in power supply PCB
Accessible metallic part
Ground part connectedto a protecting ground
Example)Primarycircuit part
Secondarycircuit part
(Fig. 6-1) Measurement of insulation
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Measure rms voltage and peak voltage at both ends of each part from to① ⑨
in the above figure and record them in test certificate form as follows. However,
if the measured voltage is lower than nominal voltage of a power supply,
recording is omitted and creepage distance and space distance can be applied
on the basis of the nominal voltage of a power supply.
Measure voltage of the parts, whose insulation is required, on the upper side of
a PCB whose parts are mounted on, as mentioned above and record them in the
following format.
<Table 6-1) Measurement of space distance and creepage distance
2.9.2 and 2.9.3 Table : Measurement of space distance, creepage distance
Measuring part ofspace distance andcreepage distance
Operatingvoltage(peakvalue: V)
Operatingvoltage(averagevalue: V)
Referencespacedistance(mm)
Spacedistancevalue(mm)
Referencecreepagedistance(mm)
Creepagedistancevalue(mm)
Transformer pin 3,pin 10
420V 4.0 X.X 6.4 X.X
A. Measuring part of space distance and creepage distance : Record the
measured part and the required insulation.
(ex : between C1 soldering part and ground (B))
B. Operating voltage (peak value, V) : Record the measured peak voltage.
C. Operating voltage (rms value, V) : Record the measured rms voltage(True
rms).
D. Reference space distance : Record the reference distance calculated on
the basis of Table 3, 4, 5 of Technical Standard.
E. Space distance value : Record the space distance measured actually at
both ends of a measuring part.
TTAS.KO-09.0018/R1(2004.12)18
F. Reference creepage distance : Record the reference distance calculated on
the basis of Table 6 of Technical Standard.
G. Creepage distance value : Record the creepage distance measured actually
at both ends of a measuring part.
Compare the measured distance value with the reference value and record in the blank
of decision.
Record also in the corresponding blank of Clause 2.9 of a test certificate.
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7. Limited current circuit test
7.1 Corresponding Clause of Technical Standard : 2.4.1
7.2 Purpose of test
To secure safety in state of normal operating and insulation breakdown or parts
trouble regarding the part where high voltage is applied and a user or a service
man can access.
7.3 Test instruments
A. 2 non-inductive resistor
B. Storage oscilloscope
C. Proper capacitor measuring instrument (LCR meter)
7.4 Test method and procedure
Measurement 1
A. Connect a non-inductive resistor of 2 to 2 arbitrary parts of a current
limit circuit or an arbitrary point of a current limit circuit.
(The equipments which a current limit circuit is applied to : LCD inverter
circuit of a note-book PC, FBR output circuit of a copy machine or a laser
beam printer)
B. Connect an equipment to the disadvantageous voltage of -10% or +6% of
the rated input voltage.
C. Operate an equipment in most disadvantageous condition during normal
operating.
D. Measure voltage and frequency at both ends by using a storage
oscilloscope and convert them into current.
E. Repeat procedure A. to D. in state that primary insulation or secondary
insulation is shorted (state of single trouble).
TTAS.KO-09.0018/R1(2004.12)20
Other circuit Current limitcircuit
Oscilloscope
(Fig. 7-1) Block diagram of measurement of current limit circuit
Measurement 2
A. Measure capacitance ( F) of the described part of A. item of Measurement 1μ
by using a proper instrument (ex: LCR meter) which can measure capacitance
in state of power-off.
B. Measure maximum operating voltage on the basis of the method described in
Measurement 1 in state that a resistor of 2 is not connected at the
identical part where the capacitance is measured.
C. Use the following formulas to decide if the measured voltage is suitable to
Technical Standard.
- 450 V peak or DC part : Apply the measured capacitance (uF) as it is.≥
- 450 V peak or DC part 15,000 V peak or DC :< ≤
Stored charge = C = ( F)V.μ μ
- 15,000 V peak of DC part : Energy = J = 1/2 CV< 2=5×(10)-7 ( F) Vμ 2
7.5 Decision of suitability
A. Allowed current value based on Measurement 1 :
- If frequency 1 K : it should not exceed 0.7 mA peak or 2 mA DC.≤
- If frequency > 1 K : it should not exceed 0.7 mA peak x K .
However, maximum allowable current is 70 mA.
TTAS.KO-09.0018/R1(2004.12)21
B. Requirements of Measurement 2 :
- 450 V peak or DC part : Capacitance of circuit should not exceed 0.1≥ μ
F.
- 450 V peak or DC < part 15,000 V peak or DC : Stored charge should≤
not exceed 45 C.μ
- 15,000 V peak or DC < part : Energy should not exceed 350 mJ.
7.6 Preparation of test certificate
A. Record the corresponding items in Clause 2.4 of a test certificate.
B. If the measured points are many, it is desirable to write "note #" in the
corresponding blank of a test certificate and record the details of test result
in "note #".
Note #1 ex :
Current through 2 K resistor :① Ω
Measuredpart
Condition
Measured voltage(V peak or DC)
Measuredfrequency(K )
Calculated current(mA peak or DC)
Allowable current(mA peak or DC)
Measurement of capacitance :②
Measuredpart
ConditionMeasured voltage(V peak or DC)
Capacitance( F)μ
Stored charge( C)μ
Energy(mJ)
- Measured part : Record both ends whose voltage is measured.
(ex : pin 3 and 4 of a connector CN1)
TTAS.KO-09.0018/R1(2004.12)22
- Condition : Record the state of operating, if it is done in normal state, or if
it is done in a single trouble, such as short or open of a part.
(ex : C1 short)
- Measured voltage : Record the measured voltage.
- Measured frequency : Record the measured frequency.
- Calculated current : Divide the measured voltage by 2000 and record it.
- Allowable current : consider the frequency and record permission
standard. (ex : It should be 14 mA if the measured frequency is 20 K .)
- Capacitance : Record the value in F which is measured with a properμ
instrument or LCR meter.
- Stored charge : Record by calculating as C = ( F)V.μ μ
- Energy : Record by calculating as J = 5(10)-7 ( F)Vμ 2.
Record the corresponding blank only according to the voltage, and record the
rest as "-".
TTAS.KO-09.0018/R1(2004.12)23
8. Ground continuity test
8.1 Corresponding Clause of Technical Standard : 2.5
8.2 Purpose of test
To decide the suitability of protecting ground used for an equipment.
8.3 Test instruments
A. AC or DC power supply of 0-12V, 0-25A
B. True rms voltmeter, ammeters
C. a connecting cable and connecting terminals
D. Or an integrated ground continuity test instrument which integrates all of
above items
8.4 Test method and procedure
A. Apply test current between the point which a grounded parts can be
activated electrically by breakdown of primary insulation and a protecting
ground terminal or a protecting ground contact.
B. Apply 1.5 times of current capacity of a certain hazard voltage circuit at the
point where the grounded part can be activated electrically in breakdown of
primary insulation. However, test voltage should not exceed 12 V, and test
current should not exceed maximum 25 A whether it is AC or DC.
TTAS.KO-09.0018/R1(2004.12)24
Description
In the above B. item, current capacity depends on fuse etc. of primary power supplymostly. For example, if a main fuse of 1 A is used, the current capacity of the circuitcan be regarded as 1 A. In the figure as shown blow;
Secondarycircuit
Primarycircuit
Fuse (F1, 1A)
Ground
(Fig. 8-1) Test position of ground continuity
If L1 is a phase line and L2 is a neutral line and the plug in use is not the inversiontype, 1.5 times of current capacity can be regarded as 1.5A. However, if the plug isthe inversion type and both of L1 and L2 are phase lines, current capacity should notbe decided by F1, but is decided by an over current protecting device of buildingcabling. Generally, 15 AFMF is used as an over current protecting device in buildingcabling. As 15A × 1.5 times is 22.5A, it is the basis that maximum test current ofTechnical Standard is decided as 15A.
Accordingly, in case of an equipment which uses a plug of the inversion type or isconnected to a power source that a phase line and a neutral line are not discriminatedclearly, if fuses are not used in L1 or L2, test current of 25A should be used.
In the above figure, if a protecting ground is used to A point, primary insulation isenough for a primary circuit and a secondary circuit. To regard A point as a protectingground, the resistance of a grounding conductor should be less than 0.1 when 25 AΩis applied between "ground" and A point.
Generally, as A point include secondary windings of a transformer, it is hard to pass 25A test. Accordingly, in most cases, the test is done by regarding B or C point only asprotecting grounds and a reinforcing insulation is done for primary and secondarycircuits and a primary insulation is done between primary circuit and ground.
TTAS.KO-09.0018/R1(2004.12)25
C. Measure the voltage difference of both ends in state that 1.5 times of
current capacity or 25A is applied between end ports which are to be used
as a ground and a protecting ground, and convert it into resistance.
D. No comment is made about a test time, however, generally the test is done
on the basis of 1 minute.
Note
1) In measuring a resistance value, the resistance value of a conductor for
protecting ground of a power cord is not included.
2) In case of an equipment which is connected to a partial assembly or a
separated equipment for protecting ground by using a wire of a multi-core
cable which supplies power to a partial assembly or an equipment, the
resistance value of a wire for protecting ground of a multi-core cable is not
included. However, the wire should be protected with a protecting device with
proper rating in consideration of impedance of a wire.
3) Attention should be paid so that the contact resistance between the end of a
probe for measurement and a metal part under test does not affect the test
result.
8.5 Decision of suitability
The resistance value between a ground contact point or a grounding terminal
and a part which needs grounding should not exceed 0.1 .Ω
8.6 Preparation of test certificate
Record the measured part, test current, and the measured resistance value in
Clause 2.5.11 of test certificate form, and record the decision of "pass" or
"rejected". In case of an complicate equipment which has a lot of measuring
points, record the detailed data by using "Note#" format.
TTAS.KO-09.0018/R1(2004.12)26
9. Limited power source test
9.1 Corresponding Clause of Technical Standard : 2.11
9.2 Purpose of test
As the one which can be applied to a power supply consisted of a
stand-alone equipment such as an adapter, if a power supply satisfies the
voltage limit test, in case of other equipment which receives power from it, an
enclosure for fire-wall can be omitted according to Clause 4.4.5.2 of Technical
Standard.
9.3 Test instruments
A. Voltage regulator : 1-250Vac, 60 , 15A or equivalent
B. Power analyzer or VAW meter
C. Electronic load or resistance load device
D. Volt meter (ac & dc)
E. Ammeter (ac & dc)
F. Stop watch
9.4 Test method and procedure
A. Measure maximum no load output voltage (Uoc) in state that the rated
input voltage, or +6 % or -10 % of the rated input voltage, is applied to
an equipment.
B. Connect an electronic load or a resistant load to an output port and
increase the load gradually. At the same time, measure voltage and current
which can flow at maximum. And if possible for the circuit, measure current
even in the state that the output is shorted. However, disregard the current
which does not flow for over 60 seconds, and disregard the transient value
which stays at less than 100 ms in case of VA measurement.
(Calculate current Isc which can flow at maximum and maximum VA.)
TTAS.KO-09.0018/R1(2004.12)27
C. In measuring regarding the above B. item, if there is an over current
protecting device, test it in state that the equipment is bypassed. And if
there is an adjusting network, test the above item even in the state of
single trouble.
9.5 Decision of suitability
A. An isolation transformer should be used for power limit which activates in
normal power or power limit which is battery-driven type which supplies
power to a load and is charged in normal power.
B. Output is limited basically so as to be suitable to Table 8 of Technical
Standard.
C. Impedance limits the output so as to be suitable to Table 8 of Technical
Standard. In case that an equipment of static characteristic temperature
coefficient is used, a corresponding equipment should be suitable to the
test regulated in Clause 15, 17 of IEC 730-1 and Clause J15, J17 of IEC
730-1.
D. An over-current protecting device is used, and the output is limited so as to
be suitable to Table 9. of Technical Standard.
E. An adjusting network limits the output so as to be suitable to Table 8 of
Technical Standard even in the state of normal operating and single trouble
(open or short circuit) of an adjusting network.
F. An adjusting network limits the output so as to be suitable to Table 8 of
Technical Standard in state of normal operating, and an over-current
protecting limits the output so as to be suitable to Table 9. of Technical
Standard in state of single trouble (open or short circuit) of an adjusting
network.
TTAS.KO-09.0018/R1(2004.12)28
G. In case that an over current protecting device is used, the protecting device
should be an electro-mechanical device which is a fuse or unadjustable and
non-automatic reset type.
H. In case of power limit of battery-driven type, decide by checking the data about the
battery from a manufacturer. In case of measuring Uoc or Isc in accordance with
Table 8, 9 of Technical Standard, the test is done in state that the battery is fully
charged.
Allowable values on Technical Standard
<Table 9-1> Intrinsically allowable values of power limit
Output voltage
(Uoc)1)Output current
(lsc)2)
A
VA3)(V×A)
V a.c V d.c
20≤
20<Uoc 30≤
---
20≤
20<Uoc 30≤
30<Uoc 63≤
8.0≤
8.0≤
150/Uoc≤
5×Uoc≤
100≤
100≤
Conditions which can be applied to <Table 9-1>
1) Uoc : Output voltage measured in accordance with the Clause 1.4.5. of
Technical Standard in state that all load circuits are disconnected. This voltage
value is DC value excluding sine wave AC and ripple. If non-sine wave AC
and peak ripple are over 10 % of DC, the peak voltage should be less than
42.4 V.
2) Isc : Maximum output current which flows after operating for 60second in state
of all non-capacity loads (including short circuit).
3) VA : Initial transient value which stays at less than maximum output VA 100 ms
in state of all load, is disregarded.
TTAS.KO-09.0018/R1(2004.12)29
<Table 9-2> Allowable power values which are not limited intrinsically (Over current
protecting device is required.)
Output voltage
(Uoc)1)Output current 2)
(lsc)
A
VA3)(V×A)
Rated current value of
an over current
protecting device4)A
V a.c V d.c
20≤ 20≤
1,000/Uoc≤ 250≤
5.0≤
20<Uoc 30≤ 20<Uoc 30≤ 100/Uoc≤
---- 30<Uoc 60≤ 100/Uoc≤
Conditions which can be applied to <Table 9-2>
1) Uoc : Output voltage measured in accordance with the Clause 1.4.5. of
Technical Standard in state that all load circuits are disconnected. This voltage
value is DC value excluding sine wave AC and ripple. If non-sine wave AC and
peak ripple are over 10 % of DC, the peak voltage should be less than 42.4 V.
2) Isc : Maximum output current which flows after operating for 60second in state
of all non-capacity loads (including short circuit) and state that an over current
protecting device is bypassed.
3) VA: Initial transient value which stays at less than maximum output VA 100 ms
in state of all load or in state that an over current protecting device is
bypassed, is disregarded.
4) The rated current value of an over current protecting device is on the basis of
a fuse and a circuit breaker which break a circuit within 120 seconds when 210
% of rated current value regulated in the table flows.
9.6 Preparation of test certificate
Record the contents of use and decision in Clause 2.11 of test certificate form,
and the detailed test data is attached by using "Reference#" format.
TTAS.KO-09.0018/R1(2004.12)30
10. Strain relief test
10.1 Corresponding Clause of Technical Standard : 3.2.5
10.2 Purpose of test
To check the implemental solidity of a power cord of fixed type.
10.3 Test instruments
A. Push pull gauge with the range of 0-100N
B. Vernier calipers
10.4 Test method and procedure
A. Arrange a power cord to the most frail direction in state that the equipment
is fully fixed.
B. Mark the current state with a pen in state that a power cord is free.
C. Pull a power cord of the equipment 25 times with the force regulated in
Table 12 of Technical Standard. Apply tensile strength to most frail
direction for 1 second every time.
<Table 10-1> Physical test of a power cord
Weight of an equipment (Kg) Tensile strength (N)
M 1≤
1<M 4≤
4<M
30
60
100
TTAS.KO-09.0018/R1(2004.12)31
10.5 Decision of suitability
A. A power cord should not be damaged during the test.
It can be checked through visual inspection and withstanding voltage test
regarding reinforced insulation between conductor part which can be
accessed by a human and a conductor.
B. There should not be any displacement of a cord over 2 long and tension
should not be applied to the connecting part.
C. Creepage distance and space distance should not be shortened to less
than the value regulated in Clause 2.9 of Technical Standard.
10.6 Preparation of test certificate
Record the tested tensile strength and the displaced length after test in Clause
3.2.5 of test certificate form, and mark its suitability.
TTAS.KO-09.0018/R1(2004.12)32
11. Stability test
11.1 Corresponding Clause of Technical Standard : 4.1.1
11.2 Purpose of test
To check the stability of installation of equipments.
11.3 Test instruments
A. 10 sloped plate˚
B. Push pull gauge of 0 -250N range
C. Push gauge of 800N
11.4 Test method and procedure
A. In case of an equipment with a container, put in the contents of the measure
which can be the most disadvantageous state, less than rated capacity, and
test it.
B. In case of an equipment with tilt and swivel, put these on the most
disadvantageous place, and test it.
C. In case of a caster and a jack used when an equipment is operated in
normal state, put these on the most disadvantageous place. However, a
caster is used for transportation of an equipment only, and if it is necessary
to put it down by using a jack after installing by instruction of a
manufacturer, use a jack only and do not use a caster. Put a jack on the
most disadvantageous place.
D. Put an equipment on a plate with 10 % slope in state that its door and
drawer are closed and turn it by 360 .˚
TTAS.KO-09.0018/R1(2004.12)33
Equipment
(Fig. 11-1) 10 sloped plate test.˚
E. In case of an equipment which weighs over 25 Kg and is used on the floor,
apply force from all directions except vertical direction with the force of 20%
(maximum 250 N) of the weight of the equipment at the position within 2 m
on the floor. Put the door and the drawer, which can move when a user or a
service man uses, at most disadvantageous place in the range instructed in
the manual of manufacturer.
F. In case of an equipment which is used on the floor, apply the force of 800
N to downward at the place, where maximum moment is applied, of all
horizontal side or of the side which foot can be put on, from the position
within 1 m on the floor. Close the door and the drawer during the test.
11.5 Decision of suitability.
In the above test A. to E., the equipment should not fall down.
11.6 Preparation of test certificate
Record the test result in the corresponding blank of Clause 4.1.1. of test
certificate form.
TTAS.KO-09.0018/R1(2004.12)34
12. Impact test
12.1 Corresponding Clauses of Technical Standard : 4.2.4, 4.2.7
12.2 Purpose of test
To check the implemental solidity of an enclosure used for the equipment.
12.3 Test instruments
A. Strong ball (diameter: 50mm, weight: 500±25g)
B. Pendulum device
C. PVC pipe
12.4 Test method and procedure
A. The test is done on the outside of an enclosure where a human may
access a dangerous part in case that it is broken. Other equipments which
free fall test is applied to are excluded.
(Examples of parts to be shocked: 1. outside of an enclosure close to an
electrically activated part, 2. weak part such as a ventilator, 3. an enclosure
positioned at the front side of protecting membrane for insulation.)
B. Put a perfect enclosure or a part of an enclosure, representing the worst
part which is not reinforced, to a normal position.
C. Fall free a strong ball, to the part except the vertical side of an equipment,
vertically at the 1,300 high, through a pipe.
D. Hang a strong ball on a proper device for the swing of the pendulum to
impact on the vertical side of an equipment, and apply horizontal impact by
falling free at 1,300 high.
TTAS.KO-09.0018/R1(2004.12)35
E. If it is not suitable to do pendulum test, lay an equipment on the floor and
then fall free a strong ball to apply vertical impact. It can be done in stead
of pendulum test.
Drop position of a strong ball
Drop position ofa strong ball
Impactposition
EUT EUTImpact position
Hard floor Hard floor
Hard
floor
(Fig. 12-1) Shock test by using a strong ball
12.5 Decision of suitability
A. After the test, dangerous voltage part should not be exposed. (Decide with
a test finger and a test pin.)
B. A space distance and a creepage distance should not be shortened to
less than the regulated.
C. In case of an equipment of class 1, a protecting ground should not be
damaged.
D. In case that a power cord of fixed type is used, a fixing device of a cord
should not be damaged.
E. Safety of an overheat-proof device, an over current protecting device,
interlock, etc. should not be deteriorated.
TTAS.KO-09.0018/R1(2004.12)36
F. If doubted, conduct the corresponding withstanding voltage test regarding
secondary insulation and the reinforced insulation.
G. Damage of finish, the dented part which does not badly affect the safety
and water-proof, tiny scratch, and crack on the surface of molded product
which is reinforced with fiber, are not regarded as "rejected".
H. If an enclosure and a part of an enclosure which are prepared separately
are used for the test, the parts need to be assembled with an equipment
and need testing.
12.6 Preparation of test certificate
Record the test result in Clause 4.2.4. of test certificate.
TTAS.KO-09.0018/R1(2004.12)37
13. Drop test
13.1 Corresponding Clauses of Technical Standard : 4.2.5, 4.2.7
13.2 Purpose of test
To check the implemental solidity of the enclosure used for an equipment.
13.3 Test instruments
A. Floor for test : the one that hard timber with thickness of over 13 ,
attached on two layers of plywoods with thickness of 19-20 , is fixed on
the concrete floor or equivalent floor without elasticity
B. measuring tape
13.4 Test method and procedure
A. As a hand-held equipment and a direct connecting equipment and an
equipment of less than 5 Kg for table, the test is done only for a
hand-held part with sound function or a headphone, or an equipment
which is designed so as to be used with a telephone of cord connecting
type.
B. Drop 3 times a set of finished equipment on the floor for test so that the
result can be worst.
C. Drop height is as follows.
- Hand-held and direct connecting type equipment : 1 m
- Equipment for table : 750
TTAS.KO-09.0018/R1(2004.12)38
13.5 Decision of suitability
A. After test, dangerous voltage part should not be exposed. (Decide with a
test finger and a test pin.)
B. A space distance and a creepage distance should not be shortened to
less than the regulated.
C. In case of an equipment of class 1, a protecting ground should not be
damaged.
D. In case that a power cord of fixed type is used, a fixing device of a cord
should not be damaged.
E. Safety of an overheat-proof device, an over current protecting device,
interlock, etc. should not be deteriorated.
F. If doubted, conduct the corresponding withstanding voltage test regarding
secondary insulation and the reinforced insulation.
G. Damage of finish, the dented part which does not badly affect the safety
and water-proof, tiny scratch, and crack on the surface of molded
product which is reinforced with fiber, are not regarded as "rejected".
H. If an enclosure and a part of an enclosure which are prepared separately
are used for test, the parts need to be assembled with an equipment and
need testing.
13.6 Preparation of test certificate
Record the test result in Clause 4.2.5. of test certificate.
TTAS.KO-09.0018/R1(2004.12)39
14. Direct plug-in moment test
14.1 Corresponding Clause of Technical Standard : 4.3.18
14.2 Purpose of test
Regarding direct connecting type equipment, to check if a plug can support
the weight of an equipment.
14.3 Test instruments
A. Test jig as shown in the following figure.
B. Vernier calipers
C. A scale
14.4 Test method and procedure
It is possible to check if the test by using a test jig or calculation satisfies the
standard.
(If the result of measurement by calculation is doubtful, it should be measured
exactly by using a test jig.)
Test by using a test jig
1) Check the weight (WM) of a weight of a test jig in advance. (If a weight is
marked after measuring the weight, a weight can be used in next test
conveniently.)
TTAS.KO-09.0018/R1(2004.12)40
(Fig. 14-1) Moment test jig
2) Set a balancing arm so as to be horizontal by moving a weight, and record
the position of the weight.
3) Insert a test instrument to a consent of a test jig.(As a place 8 apart from
a side which a plug and a consent are contacted face to face should be on
the line of a pivot, check if the consent of a jig complies with the standard
prior to test.)
TTAS.KO-09.0018/R1(2004.12)41
4) After inserting a plug of test instrument to a consent, set a balancing arm so
as to be horizontal by moving a weight again, and record the position of the
weight.
5) Calculate displacement L of a weight between before and after insertion of
a plug.
6) Calculate torque which a consent is receiving on the basis of the following
formula.
Torque = WM × L × 9.8 (N.m) (Note : In calculating, unit of Kg or meter
should be applied as so to meet N.m.)
Computing by calculating
1) Find center of gravity of an equipment by using proper tool as shown in the
following figure or by checking materials, and measure the weight m.
2) Measure the distance a and b from the center of gravity as shown in the
following figure.
Center ofgravity
(Fig 14-2) Computing moment by calculation
TTAS.KO-09.0018/R1(2004.12)42
3) Calculate Torque by using the following formula.
Torque = m × 9.8 ×(0.008 + a + b ) [N.m]
14.5 Decision of suitability
Torque by actual measurement or calculation should be less than 0.25 N.m.
14.6 Preparation of test certificate
Record the test result in Clause 4.3.18. of test certificate.
TTAS.KO-09.0018/R1(2004.12)43
15. Lithium battery reverse current test
15.1 Corresponding Clause of Technical Standard : 4.3.21
15.2 Purpose of test
To estimate the suitability of a protecting circuit used for preventing
compulsory charging and discharging of a lithium battery or a battery with
similar and poisonous materials.
15.3 Test instrument
Ammeter
15.4 Test method and procedure
A. If a lithium battery or a similar battery is used, check the circuit to prevent
compulsory charging and discharging in advance.
(Fig. 15-1) Battery protecting circuit
TTAS.KO-09.0018/R1(2004.12)44
As shown in the figure, generally, inflow of the inverse current is blocked
by connecting a diode and a resistor, or two diodes in series.
B. Pick a battery out of an equipment for safety, and connect current meter
instead.
C. Connect an equipment to rated input voltage and start normal operation.
D. Set all protecting devices to open or short, one by one at each time, as
shown in the above figure, and at each time, measure and record the
current on current meter.
15.5 Decision of suitability
The measured value should be less than maximum and abnormal charging
current value presented by a manufacturer.
(If a battery is certified by UL, maximum and abnormal charging current value
on UL certificate can be used as basis.)
15.6 Preparation of test certificate
Record the result in Clause 4.3.21 of test certificate, and record the exactly
measured value by using "Note#“.
TTAS.KO-09.0018/R1(2004.12)45
16. Heating test
16.1 Corresponding Clauses of Technical Standard : 5.1, 1.4.8, 3.3.2
16.2 Purpose of test
To check the possibility that a fire breaks out due to temperature rise, or
hazard occurs due to insulation breakdown and transformation of plastic.
16.3 Test instruments
A. Voltage regulator : 1-250Vac, 60 , 15A or equivalent
B. True rms voltmeter, ammeter, wattmeter.
C. Power analyzer or VAW meter
D. Electronic load or other load devices
E. Thermocouple
F. Temperature recorder, coil resistor tester
G. Thermocouple welder
16.4 Test method and procedure
A. measuring points
- Winding and core of a transformer
- Power cord
- Electrolytic condenser (for smoothing)
- Insulated conductor close to a heating element (wire etc.)
- Heating element
- Surface of an enclosure
- Fiber, phenolic, polumeric materials used for insulator
- The place, where temperature rise is expected, of the points which can
be contacted intentionally or unintentionally in usual operation.
- Ambient temperature during the test
TTAS.KO-09.0018/R1(2004.12)46
B. Install a thermocouple in a necessary point including the points described
in the above A. item.
(It is desirable to measure the temperature of a coil with a thermocouple in
case of a switching power supply (SMPS), and with resistance tester in
case of a linear type.)
How to use a thermocouple
A thermocouple should not be jointed by twisting or soldering, but should be welded,①
and should not be twisted on bead.
Welding : good Welding : no good Soldering : no good
How to attach to a part is to fix with a tape at a point 1 cm apart from the end and②
then apply sauresin cement (mixed with water glass and kaolin powder at the ratio of
5 to 1) and wait until it is set.
TTAS.KO-09.0018/R1(2004.12)47
How to select a thermocouple:③
- T type : Suitable to low temperature, especially to use in sub-zero temperature.
- J type : Unsuitable in test of high frequency magnetic component (error: ±5-10 )
- K type : Suitable in test of high frequency magnetic component (possible to
replace with N-couple)
- E type : Non-magnetic (possible to replace in case that K-couple shows the
influence of magnetic effect)
How to attach thermocouple :④
- 130 : Glass fibre cloth tape (3M/No. 27 tape)~
-130 250 : Epoxy/Cyanoacrylate adhesive(Be careful because thermal conductivity~
is low.)
- High temperature (1100 ~) : Sauresin cement (good thermal conductivity, but
inconvenient to use)
C. Connect an equipment to power and start operation normally. At this
moment, In case that there are extra slots or ports or terminals for external
power supply, test in the state that a load is applied according to the
specification presented by a manufacturer.
(Regarding the condition of normal operating, refer to Appendix L of
technical standard and the measurement of T2 input rating in this
procedure.)
D. An equipment which is installed as a part of a built-in equipment, a
rack-mount equipment or a big equipment is tested in the mostly
disadvantageous condition (actual state or sham state) allowed in the
installation manual from the manufacturer.
E. Regarding voltage applying to an equipment, the test is done at -10 % and
+6 % of the rated voltage respectively.
F. The test time is as follows.
- In case of an equipment which works continuously, test until it reaches
the stable state.
TTAS.KO-09.0018/R1(2004.12)48
- In case of an interruptively operating equipment, test until it reaches the
stable state by repeating "start" and "stop" in accordance with the time of
"start" and "stop".
- In case of an equipment which works for a short time, test for the defined
operating time.
The state of the stable temperature means that the temperature is kept for
over 15 minutes.
If an equipment reaches the stable state, stop the test and record the final
temperature.
G. In case that the temperature is measured by a resistance tester.
- To minimize measurement error by conductors except a winding, the
conductor for measurement of an instrument should have the proper
diameter, and the measuring point should be close to an inlet port of a
winding excluding a power cord and other wires.
Measuring pointMeasuring point
(Fig. 16-1) Measuring point by a resistance tester
- Error would be small if the temperature of a winding which has higher
resistance of primary and secondary windings is measured.
TTAS.KO-09.0018/R1(2004.12)49
Notice
When a thermocouple is attached to a part, attention should be paid so that the①thermocouple does not contact any conductor which has potential. (It can be amajor cause of the electric shock of a human body or trouble of an equipment. Andif even very low current flows through the thermocouple, wave form which is notexpected would show on a recording paper.)
In case of measurement of current leakage or test of withstanding voltage, a②thermocouple should be removed.(major cause of trouble of an equipment).
Matters to be attended in the test of a switching power supply (SMPS) : As error③between an actual value and an measured value can be caused by magneticinfluence from a magnetic part (ex : transformer) of a switching power supply, iftemperature is stable, turn off the power and measure the temperature again andcheck the temperature difference with the one when power was applied.
In case of an equipment which has a cooling fan, attention should be paid so that④the part which a thermocouple is attached is not cooled by the cooling fan.
16.5 Decision of suitability
A. An over current protecting device should not work during test, and sealing
material should not flow out.
B. If an operating temperature of an equipment by a manufacturer is over 25
, the allowable temperature rise value can be changed on the basis of
the following formula.
T - Tamb Tmax + 25 - Tmra≤
T = Temperature of the corresponding part measured under the regulated
test condition
Tmra = The higher temperature of maximum ambient temperature presented
by the manufacturer or 25
TTAS.KO-09.0018/R1(2004.12)50
Accordingly, if an operating temperature is defined as 0-35 in a user
manual or a document which is provided with an equipment, maximum
allowable temperature rise value is 10 lower than the allowable
temperature regulated in the following table. (The test under 35 is not
needed, and it can be reduced after testing in general environment. And, in
any case, the test should not be done at a temperature higher than the
regulated operating temperature.)
C. The temperature of parts contacting an electric wire should be less than a
rated temperature value of the wire.
D. The measured temperature should not exceed the allowable temperature rise
value in Table 16 of Technical Standard.
TTAS.KO-09.0018/R1(2004.12)51
<Table 16> Allowable temperature rise value (1)7)
Applied part Allowable temperature rise value (K)
Insulations including coil insulation :
- A class insulating materials
- E class insulating materials
- B class insulating materials
- F class insulating materials
- H class insulating materials
75
90
95
115
140
(refer to note 1)2) and 5))
Including inside of an equipment and a
power cord - All external wire insulated
with A class insulating materials.
Rubber or PVC insulation
- No T mark
- T mark
50
T-25
Other thermoplastic insulation (refer to note 3))
If a non-portable power cord is not used,
a terminal with a ground terminal for
external ground wire of an equipment of
fixed type.
60
A part contacting inflammable liquid (refer to 4.4.8 item)
Parts (refer to 1.5.1 item)
<Table 16> Allowable temperature rise value (2)
User access area
Allowable temperature rise value (K)
MetalGlass, ceramic,
glass materialsplastic, rubber5)
Handle, knob, grip etc. which
can be gripped or contacted for
a moment.
35 45 60
Handle, knob, grip etc. which
can be gripped continuously in
usual operation.
30 40 50
Outside of an equipment which
can be accessible4).45 55 70
Inside of an equipment which
can be accessible6).45 55 70
TTAS.KO-09.0018/R1(2004.12)52
Conditions which can be applied to (1) and (2) of Table 16.
1) In case of measuring the temperature rise of coils by using a thermocouple, the
value which is 10 K lower than the value of this clause is applied. However, a
motor is excluded.
2) Insulation class of an insulating materials (A, E, B, F and H class) should comply
with IEC 85.
3) Because there are many kinds of thermoplastic material, it is impossible to regulate
the allowable temperature rise value of them.
Thermoplastic materials should be suitable to the tests regulated in Clause 5.4.10.
4) The allowable temperature rise value of the outside of an equipment that the
dimension is less than 50 and there is no possibility to be contacted during
operation is 75 K.
5) Regarding each material, if there are data to decide the allowable temperature rise
value, it should be decided by studying the data.
6) If conditions as follows are satisfied, the temperature higher than the allowable
temperature rise value can be acceptable.
- If there is no possibility to contact the part by chance.
- If the warning mark of high temperature is on the corresponding part, it is allowed to
use the symbol of Fig. 5041 of IEC 417.
7) In case that the long term use is considered, in some sorts of insulating materials,
if softner is vaporized at lower temperature than usual softening temperature,
attention should be paid about that electrical and mechanical property can be
deteriorated by it. Refer to Clause 2.2.2.
TTAS.KO-09.0018/R1(2004.12)53
E. Even in case that an equipment is installed in a place where access is
restricted, the limit value of the allowable temperature rise regulated in items
1 and 2 of Table 16 of Technical Standard is applied. However, if an
external metal part plays the role of a heat sink plate obviously or it has a
warning mark which can be checked visually, the temperature rise up to
65K is allowed.
F. In case that a coil is measured by a resistance tester, the temperature is
calculated by the following formulas.
t=(R2-R1)/R1×(234.5+t1)-(t2-t1) : In case of a copper wire
t=(R2-R1)/R1×(225+t1)-(t2-t1) : In case of aluminium wire
t : temperature rise value (K), R1 : Initial resistance value, R2 : Final
resistance value
t1 : Initial room temperature, t2 : Final room temperature.
16.6 Preparation of test certificate
<Table 16-3> Test results of temperature rise
5.1 Table : Temperature
Test voltage (V)................... 3.1.2. 180V/230V
t1( ).................................... 23
t2( ).................................... 25
Measured position of temperature
riseMeasure value (K) Reference value (K)
Noise filter (LF1) 45/50 65
Temperature of a coil R1( )Ω R2 ( )Ω dT (K)Reference
value (K)
Insulation
class
Transformer (T1) 220 250 31 75 A
TTAS.KO-09.0018/R1(2004.12)54
A. Record the measured point, the measured value, and the reference value in
the corresponding blank of "the measured position of temperature rise" in
the above test certificate form regarding the measured points by a
thermocouple.
Regarding the measured points by a resistance tester, record the related
contents in the corresponding blank of "temperature rise of a coil".
B. Record suitability in the corresponding blank in Clause 5.1 of test certificate
form.
TTAS.KO-09.0018/R1(2004.12)55
17. Leakage test
17.1 Corresponding Clause of Technical Standard : 5.2, Appendix D
17.2 Purpose of test
To check the possibility of the electric shock of an equipment.
17.3 Test instruments
A. Voltage regulator : 0-250 Vac, 60 , 15 A or equivalents
B. Leakage current meter by Appendix D of Technical Standard or equivalents
C. Isolation transformer and select switch
D. Metal foil : 100cm × 200cm size
E. Power analyzer
F. True rms meter
G. Oscilloscope
17.4 Test method and procedure
Leakage current can be measured by an instrument described in Appendix
D. of Technical Standard or by consisting of the circuit which the equivalent
result can be achieved. As an equipment of Appendix D is classical, a
measuring circuit as shown in the following figure can be used in a
switching power supply part which works in high frequency on the basis of
IEC 990.
General
1) A system of interconnecting equipments connected to power individually is
tested respectively for each equipment, and a system as an interconnecting
equipment which all is connected to power commonly by connecting one to
power is regarded as one equipment.
TTAS.KO-09.0018/R1(2004.12)56
2) An equipment which can use multiple power sources is tested by
connecting to one power source.
3) By studying the circuit diagram of first class equipment as an eternal
connecting equipment or B type plug connecting equipment, in case of an
equipment whose ground leakage current exceeds 3.5 mA but obviously
does not exceed 5 % of input current, test is not necessary.
4) It is desirable that voltage applied to an equipment during the test is
applied through an isolation transformer. If it is impossible to install an
isolation transformer, an equipment should be installed on an insulated plate
and is not connected to ground, and safety treatment should be done so
that hazard voltage is not applied to a body of an equipment.
5) In case of an equipment of class II, a metal foil of 10 cm × 20 cm
contacted to a conductor part and non-conductor part which a user can
access is tested. If the area of a metal foil is smaller than the surface area
of EUT, the metal foil should be moved so as to test all surface area of
EUT. If a metal foils are jointed by using glue, the glue should be
conductive.
6) In applying voltage in test, the test is done in -10 % and +6 % of the
rated voltage or in the most disadvantageous one of the rated input voltage
range.
7) Test circuit is as shown in the following figure.
Isolation transformer
Ground terminal forequipment protection
EUT
Select switch
Tester
(Fig. 17-1) Test circuit of leakage current of a single phase equipment
TTAS.KO-09.0018/R1(2004.12)57
Isolation transformerEUT
Ground terminal forequipment protection
Tester
(Fig. 17-2) Test circuit of ground leakage current of a three-phase equipment
Measurement using a leakage current meter
1) In case of a single phase equipment, the test is done at the switches 1
and 2 respectively by using a leakage current meter as shown in Fig 13
and Fig 14 of Technical Standard.
2) When a select switch of 1) item is at each position, the switch used
usually as the one installed in an equipment which turns on and off primary
power is tested at the positions of all combination of on and off if
possible.
3) Set the range of a leakage current meter to the area of AC+DC and
measure the most precise value by gradually lowering the range.
Measurement on the basis of IEC 990
1) Measuring circuit is as follows.
Measuring terminal
TTAS.KO-09.0018/R1(2004.12)58
R1 : 1500 ,Ω R2 : 500 ,Ω R3 : 10 K ,Ω C1 : 0.22
C2 : 0.022 .
Voltmeter or Oscilloscope: Input resistor : >1 MΩ
Input capacitance : >200 pF
Frequency range : 15 up to 1 M
(Fig. 17-3) Measuring circuit by IEC 990
2) By using the above measuring circuit, measure voltage U with a voltmeter
or an oscilloscope in identical method with an leakage current meter.
Leakage current makes U/500. (If U is rms value, leakage current makes
rms value, and if U is peak value, leakage current makes peak value.)
17.5 Decision of suitability
The measured leakage current should be below the values regulated in the
following table.
<Table 17-1> Maximum allowable ground leakage current
Class EquipmentsMaximum leakagecurrent (mA)
IIIII
I
All equipmentHandheld equipmentPortable equipment (except handheld equipment)Fixed equipment and A type plug connecting device
Fixed equipment, eternal connecting device, B type plugconnecting device- The one which each condition of item 5.2.5 is notapplied- The one which each condition of item 5.2.5 is applied
0.250.753.53.5
3.55% of input current
TTAS.KO-09.0018/R1(2004.12)59
17.6 Preparation of test certificate
Record the measured result in the corresponding blanks of Clause 5.2 of test
certificate.
If the measured results are diverse according to manipulation of a switch,
record in details by using "Note#".
TTAS.KO-09.0018/R1(2004.12)60
18. Electric strength test
18.1 Corresponding Clause of Technical Standard : 5.3
18.2 Purpose of test
To inspect suitability of the used insulation.
18.3 Test instruments
A. Withstanding voltage tester : 0-5000V ac and dc, 60 or equivalents
B. Withstanding voltage tester for high voltage
C. Metal foil
D. Insulating table
18.4 Test method and procedure
A. Test it in state that an equipment is sufficiently warmed up just after a
temperature rise test.
B. In case of testing it separately after separating a part or a partial assembly
from an equipment, test it after warming up the parts or the partial
assembly as hot as it was warmed up in temperature rise test.
C. In case of thin film insulation by using supplementary insulation or
reinforced insulation regulated in Clause 2.9.4.2 of Technical Standard, the
test can be done in room temperature.
D. Test is done to inspect the suitability regarding all insulation required in
Technical Standard, and the kind of insulation to be applied is as shown in
Table 0.1.
TTAS.KO-09.0018/R1(2004.12)61
E. Test is done with the values regulated in Table 18 of Technical Standard,
and a operating voltage (U) is the value which is measured at both ends of
the measured insulating part in measurement of T6 operating voltage.
F. Apply voltage to the insulation and increase from 0 gradually, and apply the
regulated voltage for 60 seconds during the test.
G. In case of testing insulation coating, test it after attaching metal foil of the
surface of insulator. This method is applied to the a part only where
insulation can be weakened such as the part which has sharp and metallic
edge at the bottom of an insulator. If possible, test an insulating lining
separately. In case of attaching metal foil, pay attention so that flashover
will not be generated in the end of an insulator. In case of using metal foil
joined with glue, the glue should be conductive.
H. In an equipment which is using the reinforced insulation or the insulation
lower than it, attention should be paid so that over voltage is not applied to
the primary insulation and supplementary insulation by the voltage applied to
the reinforced insulation.
I. Equipotential wiring can be used by cutting the similar parts which are in a
integrated circuit or a secondary circuit to prevent the breakdown of
insulation or a part with no relation to the test.
J. If a capacitor is connected at both ends of an insulating part, it is
desirable to use DC test voltage. In case of using DC voltage, it is 2√
times of the regulated DC value.
K. Test is done after cutting the parts, such as the device of restricting
resistor or voltage for discharging of filtering capacitor, which provide DC
path in parallel with the tested insulation part.
TTAS.KO-09.0018/R1(2004.12)62
<Table 18-1> Application of insulation
Insulation class Insulation between X, Y
X Y
1. Functional
insulation
Refer to the
condition1)
SELV circuit
- Grounded conductive part
- Double insulated conductive part
- Other SELV circuit
ELV circuit
- Grounded conductive part
- Grounded SELV circuit
- Primarily insulated conductive part
- Other ELV circuit
Grounded secondary circuit
where hazard voltage is
applied to
- Other secondary circuit which hazard voltage
is applied to
TNV circuit
- Grounded conductive part
- Grounded SELV circuit
- Other TNV circuit of identical class
Series/parallel part of a coil
of a transformer
2. Primary
insulation
Primary circuit
- Grounded or non-grounded secondary
circuit where hazard voltage is applied to
- Grounded conductive part
- Grounded SELV circuit
- Conductive part insulated by primary
insulation
- ELV circuit
Grounded or non-grounded
secondary circuit where
hazard voltage is applied to
- Non-grounded secondary circuit where hazard
voltage is applied to
- Grounded conductive part
- Grounded SELV circuit
- Conductive part insulated by primary
insulation
- ELV circuit
TNV circuit
- Conductive part insulated by double insulation
- Non-grounded SELV circuit
- Grounded conductive part
- Grounded SELV circuit
3. Secondary
insulation
Conductive part and ELV
circuit insulated by primary
insulation
- Conductive part insulated by double insulation
- Non-grounded ELV circuit
TNV circuit
- Conductive part insulated by primary
insulation
- ELV circuit
4. Secondary or
reinforced
insulation
Non-grounded secondary
circuit where hazard voltage
is applied to
- Conductive part insulated by double insulation
- Non-grounded SELV circuit
- TNV circuit
TTAS.KO-09.0018/R1(2004.12)63
5. Reinforced
insulation Primary circuit
- Conductive part insulated by double insulation
- Non-grounded SELV circuit
- TNV circuit
Grounded secondary circuit
where hazard voltage is
applied to
- Conductive part insulated by double insulation
- Non-grounded SELV circuit
- TNV circuit
* Note 1) In the regulation regarding functional insulation, refer to Clause 5.4.4 of Technical
Standard.
<Table 18-2> Withstanding voltage for test (1)
Test voltage2)(Vrms)
Voltage applying points (corresponding blanks)
Between primary and body
Between primary and secondary
Between primary circuits
Between secondary
and body
Between the
secondary circuits3)
Operating
voltage
Insulation
class
U 184V≤
Peak
value or
DC 6)
184V U<
354V≤
Peak
value or
DC 7)
354V U<
1.41KV≤
Peak
value or
DC
1.41KV U<
10KV≤
Peak
value or
DC 8)
10KV U<
50KV≤
Peak
value or
DC
U 42.4V≤
Peak
value or
DC 60V
Peak
value
42.4V or
DC 60V
U 10KV< ≤
Peak
value or
DC
Functional
insulation1)
1,000 1,500
Refer to
Va of
Table 18
(2)
Refer to
Va of
Table 18
(2)
1.06U 500
Refer to
Va of
Table
18(2)
Primary
insulation
Supplement
ary
insulation
1,000 1,500
Refer to
Va of
Table 18
(2)
Refer to
Va of
Table 18
(2)
1.06U N/A
Refer to
Va of
Table
18(2)
Reinforced
Insulation2,000 3,000 3,000
Refer to
Va of
Table 18
(2)
1.06U N/A
Refer to
Vb of
Table
18(2)
TTAS.KO-09.0018/R1(2004.12)64
Conditions which can be applied to Table 18-2 :1) Usual or functional insulation is not tested except the case of Clause 5.4.4 (b).
2) Test voltage is applied to a solid insulator regardless of altitude. In case of spacedistance, the withstanding voltage can be decreased to the voltage multiplied bycoefficient as follows, according to altitude.
Altitude (m) Above sea level (0) 500 1000 2000
Coefficient 1 0.94 0.89 0.79
3) The value regulated for a primary circuit is applied to the part whose operatingvoltage exceeds 10 KV (AC peak value or DC) in a secondary circuit.
4) In this voltage, Vb is calculated by Vb = 155.86U0.4683, not 1.6 Va.
5) Regarding the value between adjacent blanks in the table, interpolation can be used.
6) In case of DC power supply of less than 130 V, use this blank.
7) In case of DC power supply of 130 V - 250 V, use this blank.
8) In case of DC power supply of over 250 V, use this blank.
Note - Conditions of 6 to 8 are applied in case of DC power supply, and these threeconditions are not applied in case of DC power supply that converts AC power in side of anequipment.
TTAS.KO-09.0018/R1(2004.12)65
<Table 18-3> Test voltage of withstanding voltage (rms voltage)
Upeak or DC
Varms
Vbrms
Upeak or DC
Varms
Vbrms
Upeak or DC
Varms
Vbrms
343536384042444648505254565860626466687072747678808590951001051101151201251301351401451501524)1554)1604)1654)1704)1754)1804)184185190200210220230240
500507513526539551564575587598609620630641651661670680690699708717726735744765785805825844862880897915931948964980995100010001000100010001000100010001097111111371163118912141238
800811821842863882902920939957974991100810251041105710731088110311181133114711621176119012241257128813191350137914081436146314901517154215681593160016171641166416881711173317511755177718201861190219421980
2502602702802903003103203303403503603804004204404604805005205405605805886006206406606807007207407607808008509009501000105011001150120012501300135014001410145015001550160016501700
126112851307133013511373139414141435145514741491153215691605164016741707174017721803183418641875189319221951197920062034206020872113213821642225228523432399245425082560261126612710275828052814286829343000306531303194
201820552092212721622196223022632296232823592390245125102567262326782731278428352885293429823000300030003000300030003000300030003000300030003000300030003000300030003000300030003000300030003000300030003000306531303194
17501800190020002100220023002400250026002700280029003000310032003300340035003600380040004200440046004800500052005400560058006000620064006600680070007200740076007800800082008400860088009000920094009600980010000
325733203444356636853803392040344147425943694478458646934798490250065108520953095507570258946082626864526633681169877162733475047673784080058168833084918650880789649119927394256577972798761002410171103171046310607
325733203444356636853803392040344147425943694478458646934798490250065108520953095507570258946082626864526633681169877162733475047673784080058168833084918650880789649119927394259577972798761002410171103171046310607
TTAS.KO-09.0018/R1(2004.12)66
18.5 Decision of suitability
A. Insulation breakdown should not be caused during the test.
B. When test voltage is applied, if current increases rapidly beyond control,
that is, if insulation can not limit the current to less than certain value, it is
regarded as insulation breakdown. Corona discharge or instant flashover is
not regarded as insulation breakdown.
C. A withstanding voltage tester has a function of cut-off current setting. Set
cut-off current to the low current of 5 mA and conduct the test when
applying initial test voltage. If N.G. happens in this current, apply test
voltage by gradually increasing the current again (ex: 5 TM10TM20TM100
). If N.G. happens even in the range of maximum current, it is regarded
that insulation breakdown happens.
18.6 Preparation of test certificate
<Table 18-4> Withstanding voltage test results
5.3 Table : Electric withstanding Voltage test
Applying points of test voltage Test voltage (V) Insulation breakdown
Primary and secondary(reinforced insulation)
300Vac No
Primary circuit and chassis(primary insulation)
1500Vac No
A. Applying point of test voltage : Record the point where the test is done.
B. Test voltage : Record the test voltage including DC and AC.
C. Insulation breakdown : Record as "breakdown“ or "no".
Record suitability in the corresponding blank of Clause 5.3 of test certificate.
TTAS.KO-09.0018/R1(2004.12)67
19. Abnormal test
19.1 Corresponding Clause of Technical Standard: 5.4
19.2 Purpose of test
To check the possibility of hazard of fire and electric shock etc. due to the
state or the trouble of mechanical or electrical over load of a part, or
malfunction of product, mistake during operation in the circuit.
19.3 Test instruments
A. Voltage regulator : 0 - 250Vac, 60 , 15A or equivalents
B. Power analyzer or VAW meter
C. Electronic load or proper load device
D. Switch for test
E. Temperature recorder, coil resistance tester.
F. Multimeter
19.4 Test method and procedure
A. Motor : T38. Decide by motor test in abnormal state.
B. Transformer : T20. Decide by test of abnormal state of a transformer.
C. Functional insulation : One of the following three conditions should be
satisfied.
- To be suitable to the regulation of creepage distance and space
distance regulated in Clause 2.9 of Technical Standard.
- To endure in the withstanding voltage of Clause 5.3.2 of Technical
Standard.
- To satisfy an abnormal state test.
TTAS.KO-09.0018/R1(2004.12)68
D. Electric and mechanical part : The following tests are applied for the
electric parts, which may involve some risk, except the motor in the
secondary circuit.
Interrupt a mechanical operating part at a most disadvantageous①
position in state that power is applied to a part in normal state.
In case of a part which power is applied to intermittently, continue to②
apply power to the part after causing a trouble to a driving circuit.
Test time :③
- If the trouble state of an equipment or a part is obviously not
notified to a user: The shorter time of the time until normal state is
reached and the time until a circuit is broken as the result that
trouble state is simulated.
- Other equipment or part : The shorter time of 5 minutes and the
time until a circuit is broken as the result that trouble of a part(ex:
wire break) or trouble state is simulated.
E. Regarding other part and circuit except the above item, conduct the test
according to the methods as follows.
Simulate the following trouble state.①
- Trouble of an arbitrary part used in primary circuit.
- Trouble of a part which can cause bad influence on supplementary
insulation and reinforced insulation due to trouble.
- Trouble of all parts regarding an equipment which is not suitable to
Clause 4.4.2. and 4.4.3 of Technical Standard.
- Trouble caused by connecting a load impedance which is mostly
disadvantageous to a terminal where output power or signal output
comes from the equipment, and to a connecting device (except an
outlet for power).
TTAS.KO-09.0018/R1(2004.12)69
If several outlets are connected to an internal circuit, the test can be②
done for only one outlet.
In case of a part used in a primary circuit integrated with a power③
such as a power cord, a connecting device for an equipment, a part
for EMC filter, a switch, and a wire interconnecting between
equipments, the trouble state is not simulated if creepage distance and
space distance regarding functional insulation are suitable.
Test can be done by using an actual circuit used in an equipment or④
a simulation circuit, and test can be done by separating a part or a
partial assembly from an equipment.
Test is done in all state expected during usual test and in state of the⑤
expected misuse.
Regarding an equipment with an additional protecting cover, test is⑥
done until normal state is reached after fixing the cover at right
position in state of normal no-load.
F. As an equipment operated with no operator, test as follows is done to an
equipment with an automatic temperature controller, a temperature limiter,
over heat preventing device, or an equipment with a capacitor which is not
protected with a fuse connected to a contact in parallel.
- An automatic temperature controller, a temperature limiter, or over heat
preventing device : T40. Temperature controller test should be satisfied.
- Operate the equipment in the condition regulated in temperature rise
test, and then short the temperature limiting device. In case of an
equipment with over 2 of automatic temperature controllers, temperature
limiters, or over heat preventing devices, short the devices one by one.
- In case that the current is not cut off, turn off the equipment as soon
as it reaches the stable state and cool it down to room temperature.
TTAS.KO-09.0018/R1(2004.12)70
- Test time of an equipment with the rating of short time operation is
same as the rated operating time.
- In case of an equipment with short time operation or rating of
interruptive operation, repeat the test until it reaches to the stable state
regardless of rated operating time. In this test, do not short an
automatic temperature controller, a temperature limiter, or over heat
preventing device.
- During any test as mentioned above, in case that the current is
interrupted before an equipment reaches stable state by operation of an
over heat protecting device of manual reset type or by other method,
operating time continues to that time. However, in case that the current
is interrupted by bursting at a part which is weakened intensionally,
repeat the test with another EUT. Both of the 2 tests should satisfy the
condition regulated in standard of suitability.
Example of test part for short/open in general
Rectifier, diode, transistors, triacs, SCR junctions, integrated circuit pin, EL-capacitors.
TTAS.KO-09.0018/R1(2004.12)71
(Fig. 19-1) Example of abnormal state test
19.5 Decision of suitability
A. The temperature of a transformer providing power to a part under test
should not exceed the value regulated in Appendix C1 of Technical
Standard, and in this case, exceptional items regulated in Clause C2 should
be considered.
B. In case that fire breaks out, flame should not be expanded out of the
equipment.
TTAS.KO-09.0018/R1(2004.12)72
C. Melted metal should not flow out of the equipment.
D. There should not be transformation of an equipment which does not satisfy
protection of user access area, regulation on ground, space distance, and
requirements for stability and mechanical hazard.
E. Regarding an equipment which is not suitable to Clause 4.4.2 and 4.4.3 of
Technical Standard, when the test is done in state of trouble of all parts, in
case of an equipment which does not satisfy Clause 4.4.2 and 4.4.3, as
other regulation is not made, the temperature rise of insulation materials
except thermoplastic materials should be less than 125 K in case A class
insulator, 140 K in case of E class, 150 K in case of B class, 165 K in
case of F class, and 185 K in case of H class.
F. Regarding above E. item, although bad insulation is caused, in case that an
user can not access the part where hazard voltage is applied to or the part
where hazard energy exists, the high limit of the insulator can be regulated
as less than 300 . In case of glass or ceramic materials, it can be regulated
as higher.
G. After each abnormal state test is done, conduct withstanding voltage test
regarding the following parts.
- Reinforced insulation : Or
- Primary insulation or supplementary insulation forming dual insulation; or
- Primary insulation installed between a primary circuit of 1 class equipment
connecting to A type plug and a conductive part which a user can
access : Or
- In case that space distance or creepage distance decreases to less than
the value regulated in Clause 2.9 of Technical Standard : Or
- In case of that damage, which can be checked visually, happens in
insulating part : Or
- In case that the insulating part can not be inspected.
TTAS.KO-09.0018/R1(2004.12)73
19.6 Preparation of test certificate
<Table 19-1> Test result of abnormal state
5.4 Table : Abnormal state test
Ambient temperature ( ) : 23
Model of power supply type : PWR300Ⅰ
Manufacturer of power supply : Korea Testing Co., Ltd.
Rating of power supply : 220V, 50 , 2A
No.Part
No.
Trouble
mode
Test
voltage
(V)
Test
time
Fuse
no.
Fuse
current
(A)
Result
1 C301 S/C 233 1 Hr F1 2.5
Normal operation,temperature oftransformer : stableat 100'C
2 D101 O/C 233 10 Min F1 0.8 No operation
Remarks
S/C : Short Circuit, O/C : Open Circuit, Hr : Hour, Min : Minute.
1) Record test result in detail in a supplementary table of a test certificate as
shown in the above example. Record symptoms of an equipment in the
simulated trouble and contents of trouble in other parts, etc. after test.
2) Record test result in the related item of Clause 5.4 of a test certificate
form.
TTAS.KO-09.0018/R1(2004.12)74
20. Transformer abnormal test
20.1 Corresponding Clause of Technical Standard : 5.4.3. Appendix C1.
20.2 Purpose of test
To check the possibility of hazard of fire and electric shock etc. due to
implemental or electrical overload or trouble, and mistake during operation.
20.3 Test instruments
A. Power supply of AC 0-250V, 60 , 15A or equivalents
B. Electronic Load
C. Variable resistor
D. Ammeter
E. Temperature reorder and thermocouple
F. Coil resistance tester
G. Multi meter
20.4 Test method and procedure
A. Test is done on a test table which simulates the inside of an equipment or
the condition of the inside of an equipment.
B. After checking EUT and a circuit diagram, fix a thermocouple between coils
of a transformer which is expected as hottest.
C. In case of linear power supply : Run a transformer and short each coil in
state that maximum rated load presented by the manufacturer is applied to
all secondary coils.
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Primary power
(Fig. 20-1) Test method of abnormal state of a transformer
(Example : Observe the result after applying maximum rated load to Lo1
and shorting A point of a lower coil. Again, observe the result after
applying maximum rated load to Lo2 and shorting A point of a upper coil.)
D. In case of ferro-resonant type : Conduct the test by applying the most
disadvantageous load to each secondary coil alternatively. Load should be
selected with most disadvantageous value of the following factors to induce
maximum temperature rise.
- Primary voltage, input frequency, load up to maximum rated load in no-load
of other coil.
E. Switching power source : Run a transformer in maximum rated load, and
apply load individually behind a rectifier (front of a regulator). Adjust load
until maximum VA output is induced or to the point just before foldback.
(In above figure of C item, gradually increase the load tap by tap at B
point in state that maximum rated load is connected to Lo1 and Lo2. While
running the transformer at the higher load of the load value whose
maximum VA is achieved or the load value just before foldback, measure
the temperature and observe the state.
F. Test time is as follows.
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- A transformer with external over current protecting device : Until the
protecting device starts to work.
- A transformer with overheat preventing device of automatic reset type :
The time regulated in Appendix C1 of Technical Standard, or after 400
hours.
- A transformer with overheat preventing device of manual reset type : Until
the overheat preventing device starts to work.
- Current limit transformer : Until temperature become stable.
20.5 Decision of suitability
The measured temperature value should not exceed the limit value described
in Appendix C1 of Technical Standard.
<Table 20-1> Allowable temperature of a transformer coil ( )
Maximum allowable temperature ( )
A class E class B class F class H class
Protection by proper impedance or
external impedance150 165 175 190 210
Protection by a protecting device working
within 1 hour200 215 225 240 260
Protection by other protecting devices
- Maximum value after 1 hour
- Arithmetic average value within 2 hours
and 72 hours
175
150
190
165
200
175
215
190
235
210
Arithmetic average temperature is decided as follows.
While power for a transformer turns on and off repeatedly, draw the graph of
temperature for the time during test cycle. Arithmetic average temperature ( )
is calculated as follows.
TTAS.KO-09.0018/R1(2004.12)77
Here, tmax is the average of maximum values, and tmin is the average of
minimum values.
Time
Maximum value
Minimum value
(Fig. 20-1) Calculation of arithmetic average temperature.
20.6 Preparation of a test certificate
A. Record the decision of suitability in the Clauses 5.4.3 of a test certificate
form.
B. Record test results in the corresponding blank of the Clauses C of a test
certificate form, and record the detailed test result in the supplementary
Table 5.4 or by using "Note#".
TTAS.KO-09.0018/R1(2004.12)78
21. Ball pressure test
21.1 Corresponding Clause of Technical Standard : 5.4.10
21.2 Purpose of test
To check if thermoplastic part, which is installed directly at the part where
hazard voltage is applied, endures abnormal temperature.
21.3 Test instruments
A. Ball pressure tester (by figure 21 of Technical Standard)
B. Temperature control chamber 0 - 200:
C. Vernier calipers or proper measuring device
21.4 Test method and procedure
A. Take EUT by cutting a part of thermoplastic part which is installed directly
at the part where hazard voltage is applied (mainly a transformer, a bobbin
of noise filter, or connectors).
Thermoplastic and thermosetting
A. Thermoplastic
It means all plastics which are softened if heated, and hardened if cooled, and①show plasticity (chocolate if likened to cake).
In heating process, occasionally oxidation reaction causes thermal degradation, but②intrinsic structure of molecule is not changed.
Principle of molding process means a series of processes of making material③softened by heating and then putting it in a mold with a shape and making asolidified product by cooling it rapidly.
TTAS.KO-09.0018/R1(2004.12)79
Generally, it has lower solvent resistance and thermal strain temperature than④thermosetting.
Representative thermoplastic:⑤
PE, PP, PS, PVC, PC, polyamide, ABS, PMMA, poly acetal - Poly oxymethylene, PET,PBT, PPS.
B. Thermosetting plastic
It is made in low molecule substance before solidification, and it shows fluency at①room temperature or by heating, and is reacted chemically by hardener, catalyst, orheat, and finally change to solid resin of insolubility (Chocolate if likened to cake).
Generally, it is used for industrial material or food since it has good thermal②resistance, chemical resistance, high solidity, and has good mechanical and electricalproperty.
Representative:③Phenolic, epoxy, melamine, unsaturated polyester, urea resins, silicon, polyamide,diaryl phthalate.
B. Put thermoplastic insulating part in a temperature chamber and fix the
surface horizontally, and press the surface with a strong ball of outer
diameter 5 by force of 20 N.
Note : Before the test, heat the a ball pressure tester up to 125 first in a
temperature chamber and put it on EUT.
C. A temperature chamber should be set to 40±2K higher than maximum
measured temperature value of temperature rise test. However, thermoplastic
insulation part supporting a part where primary power is applied is tested
at minimum 125 .
D. After one hour, put out EUT, and cool it down to room temperature within
10 seconds by putting it in cool water.
TTAS.KO-09.0018/R1(2004.12)80
Ball
EUT
(Fig. 21-1) Ball pressure tester
21.5 Decision of suitability
Outer diameter of a dented trace should not exceed 2 .
21.6 Preparation of a test certificate
<Table 21-1> Ball pressure test results
5.4.10 Table: Ball pressure test of thermoplastic
Reference outer diameter( ) 2≤
Test point
Test
temperature
( )
Outer diameter of the
dented trace ( )
Bobbin of a transformer T1, KTL Co., Ltd,type THP-1, Polyamide
125 1.2
Record test results in detail in the supplementary Table 5.4.10 of a test
certificate form, and record decision in Clause 5.4.10.
TTAS.KO-09.0018/R1(2004.12)81
22. TNV voltage measurement test
22.1 Corresponding Clause of Technical Standard : 6.2.1.1.
22.2 Purpose of test
To check if the voltage which is generated in a circuit connected to a
communication network is the safe value as required in Technical Standard.
22.3 Test instruments
A. Voltage regulator : 0-250Vac , 60 , 15A or equivalents
B. Storage oscilloscope
C. Resistor 5 ±2%
22.4 Test method and procedure
A. Connect an equipment to the more disadvantageous voltage of the rated
input voltage and -10% or +6% of rated input voltage, and run it.
B. In a separate TNV circuit or an interconnected TNV circuit, measure the
voltage between two conductors of TNV circuit or other circuit or between a
conductor and a ground. In case that DC and AC are coupled, measure
and record DC value and AC value separately.
Measurement example :
SELV orother circuit
TNV circuit
(Ex: Tip)
(Ex: Ring)
(Ground)
(Fig. 22-1) Measuring point of TNV voltage measuring test
TTAS.KO-09.0018/R1(2004.12)82
Measure the voltage between A and B, A and C, B and C.
C. After simulating single trouble state at the same point as above B. item,
connect a resistor of 5 ±2% and measure the voltage. Single trouble
means the state that an insulating part or the part which is primary or
supplementary insulation except reinforced insulation is shorted or opened.
22.5 Decision of suitability
A. Voltage is decided by the division of TNV circuit presented in the following
table.
<Table 22-1> Division of TNV circuit
Voltage generated during normal operating state
Possibility of overvoltage
from communication
network?
Voltage less than the
allowable value regulated as
SELV circuit
Voltage which exceeds the
allowable value regulated as
SELV circuit, but is less than
the allowable value regulated
as TNV circuit.
Yes TNV-1 circuit TNV-3 circuit
No SELV circuit TNV-2 circuit
B. TNV-1 circuit
- A measured value in normal operating state by the above test method B.
should not exceed the regulated value of SELV (42.4V peak value, 60 V
dc).
- A measured value in troubled state by the above test method C. should
not exceed the limit value regulated in Fig. 15 of Technical Standard.
TTAS.KO-09.0018/R1(2004.12)83
C. TNV-2 circuit and TNV-3 circuit
A measured value in normal operating state by the above test method B.
exceed the regulated value of SELV but should not exceed the following
value.
- In case of voltage except telephone call signal (bell sound signal) :
The value in normal operating state by the above test method C. should①
satisfy the following formula.
Uac : Peak AC voltage value in arbitrary frequency (V)
Udc : DC voltage value (V)
A voltage and single trouble state by the above test method C. should②
not exceed the limit value regulated in Fig. 15 of Technical Standard.
- In case of telephone call signal (bell sound signal) : Should satisfy T23.
telephone call signal test.
Time T(ms)
VoltagePeak value
U (unit V)T (unit ms)To=1ms
TNV limit
(refer to item 6.2.1.1)
400V peak value or
DC
In case of
(Fig. 22-1) Allowable voltage after single trouble
TTAS.KO-09.0018/R1(2004.12)84
22.6 Preparation of a test certificate
Record brief test result in the corresponding blank of 6.2.1.1 of a test
certificate form, and record the detailed test result by using "Note#".
TTAS.KO-09.0018/R1(2004.12)85
23. Telephone ringing signal test
23.1 Corresponding Clause of Technical Standard : 6.2.1.1, Appendix M
23.2 Purpose of test
To inspect if telephone call signal (Bell sound signal) has safe value which
does not cause electric shock to human body.
23.3 Test instruments
A. Voltage regulator : 0.250Vac, 60 , 15A or equivalents
B. Storage oscilloscope
C. Resistor 5
23.4 Test method and procedure
By selecting one of two methods described as follows, call signal can comply
with the methods of each nation over the world. Method A is a typical analog
telephone network used in Europe, and method B is a typical analog telephone
network used in North America. The two methods originated from technical
standard regarding electric safety can be regarded as identical in a broad
sense.
Method A
1) Observe wave form shown at resistor 5 between two arbitrary wires of TNV
circuit which is generating call signal or between arbitrary phase line and
ground wire, and calculate a value as follows.
TTAS.KO-09.0018/R1(2004.12)86
- Ip, Ipp, Idc
- , .
OscilloscopeTNVcircuit
(Fig. 23-1) Example of measurement
(Fig. 23-2) Waveform measured by an oscilloscope (peak, or peak to peak current)
(Fig. 23-3) Definition of call time and melody call cycle
* :
- In case that a call is sent out totally for 1 signal cycle, cycle time for 1 call
signal.
- In case that 1 call cycle includes over 2 dispersed calls, sum of call signals
during 1 call cycle, . in above figure.
* : Time of 1 circular cycle of full melody call.
TTAS.KO-09.0018/R1(2004.12)87
2) Calculate and on the basis of the following formulas.
I① TS1 is an rms value decided by a measured or a calculated value during
arbitrary 1 call signal cycle .
* Ip, Ipp : Refer to Fig. M.3 (unit, mA), : Refer to Fig. M.1 (unit: ms).
I② TS2 is an average value regarding a repeated call of melody call sound
signal calculated by 1 melody call sound time .
;
Method B
This is the method added with the regulation on trouble state on the basis of
chapter 68, Clause D of CFR47 (FCC Regulation), USA.
1) Configure a test circuit as the following figure.
OscilloscopeTNVcircuit
(Fig. 23-4) Block diagram of test
TTAS.KO-09.0018/R1(2004.12)88
2) Select A and measure values as follows by using an oscilloscope in state
that call sound is applied.
- Frequency
- Peak to peak voltage
- Peak to ground voltage
- Time of call sound signal
- Time between call sound and pause
3) Select B and measure values as follows by using an oscilloscope in state
that call sound is applied.
- Peak to peak voltage
- Time of call sound signal
- Convert the measure voltage into current
4) Select C and measure values as follows by using an oscilloscope in state
that call sound is applied.
- Peak to peak voltage
- Time of call sound signal
- Convert the measure voltage into current
5) Test in trouble state :
When a resistor of 5 is connected to the points as follows, measure①
peak to peak voltage and convert it into current.
- Between two arbitrary wires
- Between an arbitrary wire and ground
TTAS.KO-09.0018/R1(2004.12)89
In state of connection as follows, measure peak to peak voltage and②
convert it into current.
- When output wires are combined together
- When an arbitrary wire is grounded
23.5 Decision of suitability
Method A:
1) should not exceed the following values.
- In case of melody call ( ), the current marked by a curve of Fig. M.2
of Technical Standard regarding time .
- In case of sequential call ( ), 16 mA or 20 mA when melody call is
sequential in single trouble.
2) should not exceed 16 mA(rms).
Method B:
1) Frequency of call sound signal should be less than 70 .
2) In signal voltage measured in the above test method, peak to peak voltage
should be less than 300V, and peak ground voltage should be less than 200
V.
3) In calling, signal voltage should not exceed 5 seconds and should be
interrupted for at least 1 second by giving time of pause. Voltage during the
pause should not exceed 56.5V.
4) According to the following conditions, an interrupting device or signal voltage
for monitoring should be provided.
TTAS.KO-09.0018/R1(2004.12)90
- If current measured at C position is less than 100 mA (peak to peak), a
device does not need installing, and signal voltage for monitoring does not
need applying.
- If current measured at B position exceeds 100 (peak to peak), an
interrupting device should be installed, and if it satisfies a regulation on
interruption regulated in Fig. M.4 of Technical Standard, signal voltage for
monitoring does not need applying. If an interrupting device does not satisfy
the regulation at C position but does satisfy the regulation on interruption at
B position, signal voltage for monitoring should be applied.
- In case that current at C position exceeds 100 mA but current at B position
is less than 100 mA, one of followings should be done.
To install an interrupting device satisfying regulation on interruption①
regulated in Fig. M.4 at C position.
To apply signal voltage for monitoring.②
Interrupting device
An interrupting device of DC detecting type which is connected to a ring lead
in series which interrupts call sound according to regulation of Fig. M.4 of
Technical Standard.
Signal voltage for monitoring
Ground voltage of a part of tip or ring. This voltage is over 19 V (peak) or
below DC 56.5 V in state that call signal voltage is not applied.
5) In state of trouble in the above test method 5),
- Current as a result of should be less than 20 (rms)①
- Current as a result of should be less than 500 (rms)②
TTAS.KO-09.0018/R1(2004.12)91
Signalsourcefor call
Interruptingdevice
Maximum interrupting time t (sec)
Current
1 t is gained by measuring connecting time of resistance R of a circuit.
2 At slope of curve, l =100/ .
(Fig. 23-5) Interruption of call sound signal
23.6 Preparation of a test certificate
Record decision in Clause 6.2.1.1 b) of a test certificate form, and record the
test result in detail by using "note #".
TTAS.KO-09.0018/R1(2004.12)92
Time
Current
Note - This curve refers to the curve b in IEC479-1 Fig.5
(Fig. 23-6) ITS1 permission of melody call sound signal
TTAS.KO-09.0018/R1(2004.12)93
24. Operating voltages generated externally for TNV-2 and TNV-3 circuit
24.1 Corresponding Clause of Technical Standard : 6.2.1.3, 6.2.1.2
24.2 Purpose of test
This test is required as one of indispensible conditions instead of primary
insulation when regulation of insulation between SELV, TNV-1 circuit and an
accessible conductive part and TNV-2, TNV-3 circuit is applied on the basis
of Clause 6.2.1.2 of Technical Standard.
24.3 Test instruments
A. Test voltage generator : internal impedance-1200 ±2%, frequency-50/60 ,Ω
voltage- 120±2V A.C.
B. Storage oscilloscope
C. True rms meter
D. Stop watch
24.4 Test method and procedure
A. The cases that test is required.
Regarding TNV-2 and TNV-3 circuits in state of normal operating, in single
trouble, the insulation between SELV, TNV-1 circuit, an accessible
conductive part and TNV-2, TNV-3 circuit should not exceed the allowed
value regulated in Clause 6.2.1.1 of Technical Standard, and if the
insulation described in Table 19 as shown below is done, it is regarded as
satisfied.
And if all of the following conditions are satisfied in case of primary
insulation, test is not required.
TTAS.KO-09.0018/R1(2004.12)94
- According to Clause 2.5 of Technical Standard, SELV, TNV-1 circuit and
an accessible conductive part are connected to a protecting ground
terminal, and
- An installation manual says that a protecting ground terminal should be
grounded eternally, and
- If TNV-2 or TNV-3 circuit is designed to receive signal or power which
exceeds the allowable value of Clause 2.3.2 regarding SELV from a
connected equipment or to receive signal or power which are generated
outside, the test should be done.
<Table 24-1> Insulation required for TNV circuit
Parts to insulate Insulation
SELV circuit or accessible
conductive part
TNV-1 circuit
TNV-2 circuit
TNV-3 circuit
6.4.1 item
Primary
Primary and 6.4.1 item
TNV-1 circuit
TNV-2 circuit
TNV-1 circuit
TNV-2 circuit
TNV-3 circuit
TNV-3 circuit
Primary
6.4.1 item
Primary
TNV-1 circuit
TNV-2 circuit
TNV-3 circuit
TNV-1 circuit
TNV-2 circuit
TNV-3 circuit
Functional insulation
Functional insulation
Functional insulation
B. Regarding test voltage, use a test voltage generator appointed by the
manufacturer. If there is no appointed specification, use a test voltage
generator described in A. item of test instruments as shown above.
C. Connect a test voltage generator with terminals for communication network
of an equipment. Connect one phase of a test voltage generator with a
ground terminal of an equipment.
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D. Apply test voltage for maximum 30 minutes. If bad influence does not show
obviously, the applying time can be shortened.
E. Measure the voltage generated at SELV, TNV-1 circuit or an accessible
conductive part in state that a test voltage is connected.
F. Repeat the test by changing polarity of a voltage generator and connecting
with terminals of network.
Communication networkconnection terminal
Sampleundertest Test voltage
generator
(Fig. 24-1) Test voltage generator
24.5 Decision of suitability
Voltage measured on the basis of E. item of above test method should not
exceed 42.4 V of allowable value of SELV in normal state or 60V D.C.
24.6 Preparation of a test certificate
Record brief test result and the decision of suitability in the Clauses 6.2.1.3
and 6.2.1. of a test certificate form, and record the detailed value by using
"Note#".
TTAS.KO-09.0018/R1(2004.12)96
25. Separation of the telecommunication network from earth
25.1 Corresponding Clause of Technical Standard : 6.3.3.1
25.2 Purpose of test
In estimating insulation performance of a circuit designed to connect with
electric network and a part or a circuit which is grounded in an equipment or
through other device by withstanding voltage test, if the test is done by
removing parts as a surge absorbing device (except the capacitor) which is
used across this insulation in withstanding voltage test, this test should be
done additionally.
25.3 Test instruments
A. Voltage regulator : 0-250V ac., 60 , 15A or equivalents
B. A.C. ammeter (unit )
C. Resistor 5
25.4 Test method and procedure
A. In state that parts which are used across insulation are installed, apply the
rated voltage of an equipment or high voltage within the range of the rated
voltage to the test circuit as shown below.
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Parts which connect withinsulating part crossly(ex: surge absorber)Power connecting
part (No connection)
Sample under test
Protecting groundconnecting partor Protectinggroundconnecting pointor Protectinggroundconnecting circuitconnecting part
R a t e dvoltage
Insulation
Communication networkconnecting part(No connection)
(Fig. 25-1) Test on insulation between communication network and ground
B. Measure the current flowing between circuits connecting ground and
communication network by using an A.C. ammeter.
25.5 Decision of suitability
Current flowing in a test circuit should be lower than 10 mA.
25.6 Preparation of a test certificate
Record the test result and the decision of suitability in corresponding blanks of
the Clauses 6.3.3.1 and 6.3.3.2 of a test certificate.
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26. Leakage current to a telecommunication network
26.1 Corresponding Clause of Technical Standard : 6.3.4
26.2 Purpose of test
To inspect if the leakage current generated in main power source and flowing
in communication network has safe value which does not cause hazard of
electric shock.
26.3 Test instruments
A. Voltage regulator : 0-250Vac, 60 , 15A or equivalents
B. Leakage current meter of Appendix D of Technical Standard or equivalents
C. Isolation transformer and select switch
D. True rms meter
E. Oscilloscope
26.4 Test method and procedure
A. This test is not applied to an equipment where a circuit connected to
communication network is connected to the ground terminal.
B. Regarding an equipment that more than one circuit are connected to
communication network, test is applied to just one of circuits of each type.
C. Test method and an measuring instrument is same as the contents
described in T17. leakage current test except those described in this test
method.
D. In case of a single phase equipment, test circuit is as the following figure;
TTAS.KO-09.0018/R1(2004.12)99
Isolationtransformer Sample under test
Communication networkconnecting part(No connection)
Powersource
Instrument byAppendix D
(Fig. 26-1) Test circuit on leakage current induced to communication network
(single phase equipment)
And the test is done regarding all combination (switch S1) of normal and
opposite polarity of a power circuit and all combination (switch S2) of a
circuit connected to communication network.
Measure and record leakage current according to the positions of each
switch.
In case of class II equipment, do not include the part marked by a dotted
line in a test circuit.
TTAS.KO-09.0018/R1(2004.12)100
E. In case of 3-phase equipment, test circuit is as follows.
Isolationtransformer
Sample under test
Communication networkconnecting part(No connection)
Powersource
Instrument byAppendix D
(Fig. 26-2) Test circuit on leakage current induced to communication network
(3-phase equipment)
And conduct the test regarding normal and opposite polarity of a circuit
connected with communication network (switch S2).
In case of class II equipment, do not include the part marked by a dotted
line in a test circuit.
26.5 Decision of suitability
The measured leakage current value should not exceed 0.25 mA.
26.6 Preparation of a test certificate
Record the test result in Clause 6.3.4.1 of a test certificate, and make the
decision of suitability.
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27. Impulse test for TNV circuits
27.1 Corresponding Clauses of Technical Standard : 6.4.2, 6.4.2.1
27.2 Purpose of test
To estimate insulation performance between specific parts of TNV-1 or TNV-3
circuit and an equipment.
(This test can be substituted with withstanding voltage test.)
27.3 Test instruments
A. Impulse test instrument by Appendix N of Technical Standard
B. Metal foil
C. Storage oscilloscope.
27.4 Test method and procedure
A. Specific parts requiring TNV-1 or TNV-3 circuit and test are as follows.
a) Non-conductive part and non-grounded conductive part of an equipment
which can be touched and contacted when it is used normally as a
transmitter and a transceiver of a telephone or a keyboard.
b) Parts and circuit which contact a test finger of Fig. 19 of Technical
Standard except a connecting point of a connector which is not
accessible with a test probe of Fig. 16 of Technical Standard.
c) Circuit provided for connection with other equipment. This regulation is
applied regardless of access of circuit. This test is not applied to a
circuit designed to connect with other equipment suitable to Clause 6.4,
as it is.
TTAS.KO-09.0018/R1(2004.12)102
B. Test circuit is as follows.
PowerConnecting part(No connection)
Communication networkconnecting part(No connection)
Protectingground
Connecting(a) and (c) only
Test voltagegenerator
Metalfoil
Plastic part
(Fig. 27-1) Test voltage applying method
C. Instead of overall test of an equipment, this test is allowed to be applied
to the parts provided to satisfy the requirements of insulation obviously. In
this case, the parts should not be bypassed by other parts, an installed
equipment or wiring. If these parts or wiring comply with the requirements
of insulation of Clause 6.4 of Technical Standard, the test is not required.
D. All conductive lines designed to connect with communication network
including arbitrary electric wire required to connect with ground by
communication network authority should be tied up together. (Refer to the
above figure.) Likewise, in case of c), all conductive lines designed to
connect with other equipment are tied up together.
E. Apply A.C. impulse to electric insulation by using an impulse generator of
Appendix N of Technical Standard. Apply impulse every 60 seconds. Initial
voltage value Uc is as follows.
- In case of a) of item 1) : 2.5 kV
- In case of b) and c) : 1.5 kV
TTAS.KO-09.0018/R1(2004.12)103
27.5 Decision of suitability
A. When test voltage is applied, if current increases rapidly beyond control,
that is, if insulation can not limit the current to lower than certain value, it is
regarded as insulation breakdown.
B. In case that a surge absorber works during the test (or spark-over is
generated in gas discharging tube) :
- In case of the above test method of A), a), it is regarded as unstable.
- In case of the above test method of A), b) and c), it is allowed.
C. Check the damage of insulation by testing insulation resistance. In case
that D.C. 500 V or a surge absorber is used, test voltage should be D.C.
voltage of 10 % lower than the operating voltage of a surge absorbing
device or striking voltage. Insulation resistance should be more than 2 ,
and the surge absorber can be separated in measuring insulation
resistance.
D. Operation of a surge absorber or breakdown of an insulated part can be
decided by other method or by measuring waveform of an oscilloscope.
(Refer to Appendix S of Technical Standard regarding check of breakdown.)
27.6 Preparation of a test certificate
Record the test result and the decision of suitability in the corresponding blank
of Clause 6.4.2.1 of a test certificate.
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28. Electric strength for TNV circuits
28.1 Corresponding Clauses of Technical Standard : 6.4.2, 6.4.2.2
28.2 Purpose of test
To estimate insulation performance between specific parts of TNV-1 or TNV-3
circuit and an equipment. (This test can be substituted by Impulse test.)
28.3 Test instruments
A. Withstanding voltage instrument : 0 - 5 ac/dc.
B. Metal foil
28.4 Test method and procedure
A. Specific parts requiring test with TNV-1 or TNV-3 are as follows.
a) Non-conductive part and non-grounded conductive part of an equipment
which can be touched and contacted when it is used normally as a
transmitter and a transceiver of a telephone or a keyboard.
b) Parts and circuit which contact a test finger of Fig. 19 except a
connecting point of a connector which is not accessible with a test probe
of Fig 16 of Technical Standard.
c) Circuit provided for connection with other equipment. This regulation is
applied regardless of access of circuit. This test is not applied to a
circuit designed to connect with other equipment suitable to Clause 6.4,
as it is.
TTAS.KO-09.0018/R1(2004.12)105
B. Instead of overall test of an equipment, this test is allowed to be applied
to the parts provided to satisfy the requirements of insulation obviously. In
this case, the parts should not be bypassed by other parts, an installed
equipment or wiring. If these parts or wiring comply with the requirements
of insulation of Clause 6.4 of Technical Standard, the test is not required.
C. All conductive lines designed to connect with communication network
including arbitrary electric wire required to connect with ground by
communication network authority should be tied up together. (Refer to
figure as above.) Likewise, in case of c), all conductive lines designed to
connect with other equipment are tied up together.
D. Apply D.C. voltage same as the peak value of sine wave voltage of
frequency 50 or 60 or with the regulated A.C. test voltage for 60
seconds. Applying voltage is as follows.
- In case of a) of 1) item : 1.5 kV
- In case of b) and c) : 1.0 kV
Increase test voltage from 0 to the regulated value, and keep it at the
regulated value for 60 seconds.
E. If a capacitor is connected with both ends of an insulation part, it is
recommended to apply D.C. voltage and conduct the test.
F. In case of the above specific parts b) and c), if a surge absorber satisfies
b) and c) of TNV circuit impulse test when it is tested out of an equipment
separately, the surge absorber can be removed.
TTAS.KO-09.0018/R1(2004.12)106
28.5 Decision of suitability
A. When test voltage is applied, if current increases rapidly beyond control,
that is, if insulation can not limit the current to lower than certain value, it
is regarded as insulation breakdown. (When the test is done by increasing
cut-off current of a withstanding voltage tester, if results are no good at
any value, it is regarded as unsuitable.)
B. In case that a surge absorber works during the test (or spark-over is
generated in gas discharging tube) :
- In case of the above test method of A), a), it is regarded as unstable.
- In case of the above test method of A), b) and c), (test with a surge
absorber device) it is regarded as unsuitable.
28.6 Preparation of a test certificate
Record the test result and the decision of suitability in corresponding blanks of
Clause 6.4.2.2. of a test certificate form.
TTAS.KO-09.0018/R1(2004.12)107
29. Flammability test for fire enclosures of movable and stationary equipment
(exceeding 18 kg)
29.1 Corresponding Clause of Technical Standard : A.1
29.2 Purpose of test
To inspect if the enclosure for firewall of a portable equipment and a
stationary equipment whose total weight is over 18 kg can minimize the
possibility of ignition and fire or expansion of flame.
29.3 Test instruments
A. Ventilation hood : To prevent the possibility that toxic gas is generated
during the test. But, ventilation should not affect the test.
B. Bunsen burner : Inner diameter 9.5±0.5 , and 100 from an air inlet.
C. Gases whose calorific value is 37 MJ/ : Industrial Methane gas (maximum
purity 98.0 mole) or natural gas with a regulator and a gas flowmeter.
D. Temperature chamber of air circulation type.
E. Supporter for sample under test
F. Cotton
29.4 Test method and procedure
A. Test three of materials under test with the thickness same as one of
thinnest part of a firewall enclosure itself or a part of a fire-wall enclosure
(including holes for ventilation).
TTAS.KO-09.0018/R1(2004.12)108
B. Prior to test, select the higher value of the temperature 10K higher than the
maximum value, which is applied in temperature rise test of Clause 5.1 of
Technical Standard, and 70 , and cool it down to room temperature after
pre-treatment for 7 days (168 hours) in a temperature chamber of air
circulation type.
C. Install a material under test as in actual use. Put cotton at the point of 300
below the part which flame for test reaches.
D. Put a Bunsen burner vertically and adjust flame so that whole flame makes
around 130 long and blue flame makes 40 long.
E. Apply the test flame to the inside surface of a material under test, the part
where the possibility of ignition is because it is close to an ignition source.
F. In case of vertical part, apply flame at 20° angle from vertical line. If there
are holes for ventilation, apply flame at the edge of hole part, and in other
case, apply flame to on the plain side. In any case, the end of blue flame
should touch the material under test.
G. Apply flame for 5 seconds and pause for next 5 seconds. Repeat it 5
times to the same part.
H. Repeat this test to the other 2 materials under test. In case of the part
which has more than 2 fire-wall enclosures close to ignition source, conduct
the test by applying flame to the each corresponding part of each material
under test.
TTAS.KO-09.0018/R1(2004.12)109
Flameouter : 130diameter
Blueflame : 40
Burnerinnerdiameter
Bunsen burner
Vertical part flame application
Part except vertical part
Enclosure for firewall
(Fig. 29-1) Test flame and how to apply the flame
29.5 Decision of suitability
During the test, a flame or a lump of flame which can ignite cotton of a
material under test should not fall down. A material under test should not burn
for over 1 minute after 5th test flame is turned off and should not burn
completely.
29.6 Preparation of a test certificate
Record the test result in the Clauses A.1 and A. of a test certificate form and
make the decision of suitability.
TTAS.KO-09.0018/R1(2004.12)110
30. Flammability test for fire enclosures of movable and stationary equipment (not
exceeding 18 kg)
30.1 Corresponding Clause of Technical Standard : A.2
30.2 Purpose of test
To inspect if the enclosure for firewall of a portable equipment and a
stationary equipment whose total weight is lower than 18 kg can minimize the
possibility of ignition and fire or expansion of flame.
30.3 Test instruments
A. Ventilation hood : To prevent the possibility that toxic gas is generated
during the test. But, ventilation should not affect the test.
B. Bunsen burner : Inner diameter 9.5±0.5 , and 100 from an air inlet.
C. Gases whose calorific value is 37MJ/ : industrial Methane gas (maximum
purity 98.0 mole) or natural gas with a regulator and a gas flowmeter.
D. A supporter for the material under test.
30.4 Test method and procedure
A. Test 3 of materials under test. In case of an enclosure for fire wall,
conduct the test with the thickness same as one of thinnest part of a
firewall enclosure itself or a part of a fire-wall enclosure (including holes
for ventilation), and in case of a material located in an enclosure for fire
wall, each material under test should consist of one of the followings.
TTAS.KO-09.0018/R1(2004.12)111
- All materials : Or
- A part of material with the thinnest thickness : Or
- Materials of the form of a small plate or the form of a pole for test with
the thickness same as the thinnest part
In case of a part used inside of an enclosure for fare wall, the material
under test should be all parts in any case.
B. Prior to test, select the higher value of the temperature 10K higher than the
maximum value, which is applied in temperature rise test of Clause 5.1 of
Technical Standard, and 70 , and cool it down to room temperature after
pre-treatment for 7 days (168 hours) in a temperature chamber of air
circulation type.
C. Attach a test tag as in actual state of use.
D. Put a Bunsen burner vertically and close the air hole, and adjust flame so
that whole flame makes around 20 long.
E. Apply flame to a part with the possibility of ignition because the part is
close to ignition source on inside surface of a material under test. In case
of estimation of material used inside of an enclosure for fire wall, test
flame can be applied to the outside of a material under test. In case of
inspection of a part used inside of an enclosure for firewall, apply test
flame to the material under test directly.
F. In case of vertical part, apply flame at 20° angle from vertical line. If there
are holes for ventilation, apply flame at the edge of hole part, and in other
case, apply flame to on the plain side. In any case, the end of flame
should touch the material under test.
TTAS.KO-09.0018/R1(2004.12)112
G. Apply flame for 30 seconds, and pause for the next 1 minute, and apply
flame again for 30 seconds.
H. Repeat this test to the other 2 materials under test. If more than one part
of the material under test are close to an ignition source, apply flame to
other part of each material under test close to an ignition source.
30.5 Decision of suitability
A. After second test flame is turned off, a material under test should not burn
for over 1 minute and should not burn completely.
B. Instead of instruments and procedure regulated in the Clauses A.2.4. and
A.2.5. of Technical Standard, those in the Clauses 4 and 8 of IEC 695-2-2
: [Fire test II : Needle-flame test] can be applied. In this case, how to
apply flame, time, and number comply with the Clause A.2.5. of Technical
Standard, and the suitability is decided according to Clause A.2.4.
Either of the above A. or B. item should be satisfied.
30.6 Preparation of a test certificate
Record test result in Clause A.2 and A. of a test certificate and make the
decision of suitability.
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31. High current arcing ignition test
31.1 Corresponding Clause of Technical Standard : A.3
31.2 Purpose of test
To check if an enclosure located within 13 from a flame source, such as a
commutator and a contact of a switch which are not sealed, or a part of it
minimizes hazard of ignition and expansion of fire or flame. (This test is
applied to an enclosure only but not to a part.)
31.3 Test instruments
A. Electrode for test 2 each
B. Voltage regulator : 220-240V, 50 or 60 .
C. Variable load of inductive impedance (power factor 0.5)
31.4 Test method and procedure
A. Test 5 samples regarding each material of an enclosure. Dimension of
sample should be 130 long and 13 width and thickness same as the
thinnest part of an enclosure. The edge should not have burr, fin, etc.
B. Test by using a variable load of inductive impedance connected, in parallel,
with 2 test electrodes and power of A.C. 220-240 V or power of 60 .
TTAS.KO-09.0018/R1(2004.12)114
Stationary electrodeMovable electrode
Z=load(power factor 0.5)Sample under test
(Fig. 31-1) High current arc test circuit
The same circuit as the above figure can be used.
C. Of 2 electrodes, fix one electrode and let the other one be movable. A
fixed electrode should be copper, which has a shape of a chisel, whose
end part has angle of 30° and outer diameter of 3.5 , and a movable
electrode, as a stainless pole with outer diameter 3 , which has an angle
of 60° at the end in shape of symmetric pyramid, should be movable along
an axis. The curvature radius of ends of 2 electrodes should be shorter
than 0.1 , and 2 electrodes should be placed face to face with an angle
of 45° horizontally. Short those and adjust a variable load of impedance so
that current of 33A flows in power factor of 0.5.
D. When electrodes are contacted by fixing test sample in the air or on a
non-conductive object horizontally, let electrodes contact the surface of a
test sample. Cut off a circuit by putting a movable electrode away from
the fixed one by manual or other manner, and make a closed circuit by
putting it near to the fixed one again, and make arc 40 times per minute.
Make the retreating speed of the movable electrode be 254±25 /s.
E. Until test sample is ignited and holes are created in the test sample, or
until arc is generated 200 times, repeat the test.
TTAS.KO-09.0018/R1(2004.12)115
31.5 Decision of suitability
Until test sample is ignited, number of arc should be the average of over 15
times in case of material of fire resistance class V-0, and over 30 times in
case of other material.
31.6 Preparation of a test certificate
Record the test result in the Clauses A.3 and A. of a test certificate and make
the decision of suitability.
TTAS.KO-09.0018/R1(2004.12)116
32. Hot wire ignition test
32.1 Corresponding Clause of Technical Standard : A.4
32.2 Purpose of test
To check if an enclosure located within 13 from a part, which can reach the
ignition temperature in normal or abnormal operating, minimizes hazard of
ignition and expansion of fire or flame.
32.3 Test instruments
A. Nichrome wire : Nickel-80%, chrome-20%, length-250±5 , diameter-0.5 ,
resistance-5.28 /m at room temperature.Ω
B. Variable power : 0-50Vac, 60 , 15A or equivalents
C. VAW meter
D. Stop watch
32.4 Test method and procedure
A. Test 5 samples regarding each material of an enclosure. Dimension of a
sample should be 130 long and 13 width and uniform thickness same
as the thinnest part of an enclosure. The edge should not have burr, fin,
etc.
TTAS.KO-09.0018/R1(2004.12)117
B. Use Nichrome wire whose length is 250±5 long and diameter is 0.5
and which does not contain iron content (nickel 80%, chrome 20%) and
resistance at room temperature is 5.28 /m. Connect a nichrome wire with aΩ
variable voltage source after straightening it, and adjust power so that
power consumption makes 0.26W/ (65W at both ends of a nichrome
wire) and apply it for 8~12 seconds. After cooling it down, wind it on a
sample 5 turns at interval of 6 .
C. Fix a sample wound with a Nichrome wire horizontally, and connect both
ends of it with a variable power source, and adjust power so that power
consumption makes 0,26W/ (65W at both ends of a nichrome wire).
Nichrome wire
(Fig. 32-1) Heating element ignition test device
D. Prior to test, apply power so that current of power density of 0.26W/ ±4%
flows. Continue the test until the sample is ignited, or for 120 seconds. At
the igniting time or after 120 sec, stop the test, and record the test time.
If ignition is not generated and a sample under test is melted by a heating
element, stop the test at the time when the heating element wound on the
sample 5 turns does not contact the sample closely.
E. Repeat this test for the other samples.
TTAS.KO-09.0018/R1(2004.12)118
32.5 Decision of Suitability
The sample should be ignited for over fifteen seconds on average.
32.6 Preparation of a test certificate
Record test result and the decision of suitability in the A.4 and A of a test
certificate form.
TTAS.KO-09.0018/R1(2004.12)119
33. Hot flaming oil test
33.1 Corresponding Clause of Technical Standard : A.5
33.2 Purpose of test
To check if an enclosure for firewall has the structure which minimizes the
possibility of diffusion of flame, melting metal, burning and red heating
particles or burning drops.
33.3 Test instruments
A. Cotton cloth : around 40g/
B. Small oiling container in shape of a scoop (Outer diameter is less than 65
.)
C. Distilled fuel of Medium volatility 10ml : weight per unit volume : 0.845g/
- 0.865g/ , ignition point : 43.5 - 93.5 , average heating value : 38Mj/
.ℓ
D. Stop watch.
33.4 Test method and procedure
A. Firmly fix a finished product of an enclosure for firewall or sample under
test horizontally. Put a layer of a bleached cotton cloth on a plain plate 50
below the sample under test. The cotton cloth should have enough size
to fully cover the hole part of the sample, but if oil does not flow through
a hole of the sample, it should not be big to the degree that oil overflown
at the corner or other place can be contained.
B. It is desirable to enclose around the test area with a metal screen or
glasses with built-in net.
TTAS.KO-09.0018/R1(2004.12)120
C. Fill 10 of the distilled fuel of medium volatility whose weight per unit
volume is 0.845g/ - 0.865g/ , ignition point is 43.5 - 93.5 ,
average heating value is 38MJ/ to an oiling hole and a metal oilingℓ
container in shape of a small scoop with a long handle which is kept
horizontally during oiling.
D. Heat an oiling container filled fully with oil, and ignite it. After burning for 1
minute fill all the oil through the center of an oiling hole at the point of
100 high from an oiling hole at the speed of around 1 /s.
E. repeat this test 2 times at the interval of 5 minutes. In the second test,
change with clean cotton cloth.
33.5 Decision of suitability
Cotton cloth should not be ignited during the above test.
33.6 Preparation of a certificate
Record the test result in Clause A.5 and A of a test certificate and make a
decision of suitability.
TTAS.KO-09.0018/R1(2004.12)121
34. Flammability test for classifying Materials V-0, V-1 or V-2
34.1 Corresponding Clause of Technical Standard : A.6
34.2 Purpose of test
To check the fire resistance class of other material except foamed materials
(including hardened foamed materials) and parts.
34.3 Test instruments
A. Ventilation hood : To prevent the possibility that toxic gas is generated
during the test. But, ventilation should not affect the test.
B. Bunsen burner : Inner diameter 9.5±0.5 , and 100 from an air inlet.
C. Gases whose heating value is 37MJ/ : Industrial methane gas (maximum
purity 98.0 mole) or natural gas with a regulator and a gas flowmeter.
D. Temperature chamber of air circulation type
E. Calcium chloride dryer
F. Temperature and humidity chamber
G. Supporter for sample under test
H. Surgical sanitary cotton
34.4 Test method and procedure
A. Test 10 samples of materials or assemblies as follows.
TTAS.KO-09.0018/R1(2004.12)122
B. Materials under test should be around 130 long and around 13 wide,
and should have thickness same as the thinnest thickness. In case of
sound proof materials, except foamed plastic, used by attaching to a panel
of other materials, the one whose sound proof materials is attached to a
panel with thickness same as the thinnest thickness, can be used. In case
of testing assembly, a sample bigger than the regulated size, as an
assembly or a part of an assembly, can be used. The finished products
such as a gear, a wrap, a bearing, a tube, a wiring tool etc. can be
tested, and a sample made by cutting a finished product can be tested.
C. Prior to test, pre-treat a group of 5 samples in a temperature chamber of
air circulation type at 70±1 for 7 days (168 hours). And then, at once,
put those in a dryer with Calcium chloride for 4 hours and cool down to
room temperature. Pre-treat another group (5 samples) under condition of
relative humidity 45% ~ 55%, temperature 23±2 for 48 hours.
D. Put a sample along the length vertically and fix the upper end with a
clamp. At this time, locate a bottom side corner of a sample at the
position of 300 above a spreaded cotton of 50 × 50 with thickness
of 6 which is not dented.
E. In state that a Bunsen burner is not ignited, whose inner diameter is
9.5±0.5 and length is 100 from an air inlet, put the burner vertically
and fix under an sample so that an axis of the burner is along the sample.
At this time, put the end of a burner barrel at the position of 9.5 under
the end of a sample.
TTAS.KO-09.0018/R1(2004.12)123
F. It should be easy to move out and in the burner with its supporter. Use
gas which has heating value of around 37 MJ/ . In state that the burner is
out of the position, ignite and adjust so that height of flame is 20 and
blue flame is stable.
Bunsen burner
Surgical cotton
Blue flame
Sample under test
(Fig. 34-1) Test flame for V-0, V-1 and V-2
G. Put a burner under a sample, and after 10 seconds, turn off the flame.
After flame is turned off, burning time of a sample should be shorter than
10 seconds in case of V-0, and shorter than 30 seconds in case of V-1
and V-2.
H. Just after burning of a sample, repeat G. procedure on the very sample. In
the second test, after turning off flame, red heating time of the sample
should be blow 30 seconds in case of V-0, and shorter than 60 seconds,
in case of V-1 and V-2.
I. Regarding the remaining 4 samples of a group, repeat the test of G. and H.
TTAS.KO-09.0018/R1(2004.12)124
34.5 Decision of suitability
A. V-2 class :
Materials satisfying all the following items. (Only those which have thickness
over the tested thickness.)
- All samples should satisfy the above procedures G, H, and I.
- Average burning time of 5 samples of a group should be shorter than 25
seconds.
- Samples should not burn up to the point of a fixing clamp.
- In case of V-2 class, surgical cotton can be ignited.
B. V-1 class :
Materials satisfying all the following items. (Only those which have thickness
over the tested thickness.)
- All samples should satisfy the above procedures G, H, and I.
- Average burning time of 5 samples of a group should be shorter than 25
seconds.
- Samples should not burn up to the point of a fixing clamp.
- While test flame is applied or not, cotton should not be ignited by a
small particle or drops from a sample under test.
TTAS.KO-09.0018/R1(2004.12)125
C. V-0 class :
Materials satisfying all the following items. (only those which have thickness
over the tested thickness.)
- All samples should satisfy the above procedures G, H, and I.
- Average burning time of 5 samples of a group should be shorter than 5
seconds.
- Samples should not burn up to the point of a fixing clamp.
- While test flame is applied or not, cotton should not be ignited by a
small particle or drops from a sample under test.
D. If one of 5 samples of a group is not suitable, conduct the identical test
for other group (5 each) of samples. All samples of second group should
be suitable to the above test to be classified to V-0, V-1 or V-2.
34.6 Preparation of a test certificate
Record the test result briefly in the Clauses A.6 and A of a test certificate and
make a decision, and record the detailed test result by using "Note#".
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35. Flammability test for classifying HF-1, HF-2 or HBF
35.1 Corresponding Clause of Technical Standard : A.7
35.2 Purpose of test
To check the fire resistance class of foamed materials and parts.
35.3 Test instruments
A. Ventilation hood : To prevent the possibility that toxic gas is generated
during test. But, ventilation should not affect the test.
B. Bunsen burner : Inner diameter 9.5±0.5 , 100 from an air inlet, flame
expander-50
C. Gases whose heating value is 37MJ/ : Industrial Methane gas (maximum
purity 98.0 mole) or natural gas with a regulator and a gas flowmeter.
D. Temperature chamber of air circulation type
E. Calcium chloride dryer
F. Temperature and humidity chamber
G. Sample supporter
H. Horizontal steel wire net
I. Surgical sanitary cotton
TTAS.KO-09.0018/R1(2004.12)127
35.4 Test method and procedure
A. Prepare 10 of foamed plastic materials.
B. Materials under test should be around 150 long and around 50 wide,
and should have thickness same as the thinnest thickness. In case of
foamed materials used by attaching to a panel of other materials, the one
whose sound proof materials is attached to a panel with thickness same as
the thinnest thickness, can be used.
C. Prior to test, pre-treat a group of 5 samples in a temperature chamber of
air circulation type at 70±1 for 7 days (168 hours). And then, at once,
put those in a dryer with Calcium Chloride for 4 hours and cool down to
room temperature. Pre-treat 5 samples of another group (B) under
condition of relative humidity 45% ~ 55% and temperature 23±2 for 48
hours.
D. Put a sample on a horizontal steel wire net (6.5 quadrate net of 0.8
steel wire). Size of this wire net is 200 long and 75 wide. Bend the
wire vertically at a point of 13 apart from the wire net. Fix the wire net
above cotton at a place of around 300 high.
E. By using a Bunsen burner with a flame expander of inner diameter 9.5±0.5
, 50 wide and 100 long from an air inlet, make fish tail flame. Put a
burner below 13 under the bent part of a wire net so that flame is in
parallel with the bent part and is in center of the bent part.
F. It should be easy to move out and in the burner with its supporter. Use
gas which has heating value of around 37MJ/ . In state that the burner is
out of the position, ignite and adjust it so that height of flame becomes 38
and blue flame becomes stable.
TTAS.KO-09.0018/R1(2004.12)128
Surgical cotton
Steel wire net
Sample undertest
(Fig. 35-1) Test block diagram of MF-1, MF-2, H13F
G. Put a sample horizontally on a wire net so that an end of the sample
contacts the end of the vertically bent part of the wire net. If a sample is
the one combined with other material, put a sample so that the part of
foamed material is located to upper direction.
H. Put a burner under a sample, and after 60 seconds, turn off the flame.
Repeat this test for the remaining 9 samples.
35.5 Decision of suitability
A. HF-2:
should satisfy all of the following conditions.
Over one of samples of the group A or the group B should not burn①
for over 2 seconds after flame is turned off.
After test flame is turned off, the burning time of all samples under test②
should be shorter than 10 seconds.
After test flame is turned off, the red heating time of all samples under③
test should be shorter than 30 seconds.
TTAS.KO-09.0018/R1(2004.12)129
The length of flame burning or red heating from the point where test④
flame is applied should be shorter than 60 .
It is allowable to ignite cotton.⑤
B. HF-1:
It should satisfy the condition of ~ of decision of HF-2 class① ← ↓ ←
Cotton should not be ignited by a small particle or drops from a②
sample during ignition or after test flame is turned off.↑
C. HBF:
Although it does not satisfy the condition of ~ of the decision of← ↓ ←
HF-2 class, all samples should satisfy one of following conditions.
- Burning speed for 100 length should be less than 40 /min, or
- Burning should stop before flame reaches a point 120 apart from the
point where flame is applied.
- In case that only one sample of group A or group B is not suitable to
the above requirements, regarding 5 samples of other group, the same
test is done through pre-treatment. All samples of this group should
satisfy the above requirements.
D. If samples of group A or group B are not suitable to the requirements of
HF-2 of the above item A and HF-1 of the above item B by one of the
followings, the same test is done for 5 samples of the second group.
TTAS.KO-09.0018/R1(2004.12)130
- Although the burning time of a sample is over 10 seconds, if the burning
time of another sample in the same group is over 2 seconds and shorter
than 10 seconds, or
- If the burning time of 2 samples in the group is over 2 seconds and shorter
than 10 seconds, or
- If burning or red heating length of a sample in the group exceeds 60
from the point where test flame is applied, or
- If red heating time of a sample of a group is over 30 seconds after flame
is turned off, or
- The case that cotton is ignited by a small particle or drops from a sample
of a group.
35.6 Preparation of a test certificate
Record the test result briefly in the Clauses A.7 and A of a test certificate and
make a decision of suitability, and record the detailed test result by using
"Note#".
TTAS.KO-09.0018/R1(2004.12)131
36. Flammability test for classifying Materials HB
36.1 Corresponding Clause of Technical Standard : A.8
36.2 Purpose of test
To check fire resistance of materials of HF class.
36.3 Test instruments
A. Ventilation hood : To prevent the possibility that toxic gas is generated
during the test. But, ventilation should not affect the test.
B. Bunsen burner : Inner diameter 9.5±0.5 , and 100 from an air inlet
C. Gases whose heating value is 37MJ/ : Industrial Methane gas (maximum
purity 98.0 mole) or natural gas with a regulator and a gas flowmeter.
D. Temperature and humidity chamber
E. Sample supporter
F. Horizontal steel wire net
G. Measuring tape
H. Protractor
36.4 Test method and procedure
A. Prepare 3 samples of materials or assemblies.
TTAS.KO-09.0018/R1(2004.12)132
B. Materials for a sample should be 130 long and 13 wide, and its edge
should not be sharp, and should have the thickness same as or thinner
than the thinnest part. If the thickness of materials is over 3 , use a
sample of 3 thickness. Mark a line at the points of 25 and 100 from
an end of a sample to the direction of width.
C. Prior to test, pre-treat samples in condition of temperature of 23±2 and
relative humidity of 45% ~ 55% for 48 hours.
D. Put a sample so that a longer side is horizontal and a shorter side is at
the angle of 45°, and fix the opposite end of the making line of 25 with a
clamp. Fix steel wire net of plate form horizontally at the point of 10 below
the lower edge of a sample, and locate the other end of a sample, which is
not fixed, at the position just above an end of the steel wire net.
Sampleundertest
Metalnet
Metalnet
about
(Fig. 36-1) Fire resistance test device for HB class
E. To make the end of a sample contact test flame when a burner is ignited,
tilt a Bunsen burner, whose inner diameter is 9.5±0.5 and the length is
around 100 from an air inlet, around 45% for the vertical line in state that
it is not ignited, put axis of a burner so as to meet the vertical side
identical with lower edge of a sample, and fix it so that the lower end of a
burner tube is located at the point 10 below the side, which is not fixed,
of a sample.
TTAS.KO-09.0018/R1(2004.12)133
F. It should be easy to move out and in the burner with its supporter. Use
gas which has heating value of around 37MJ/ . In state that the burner is
out of the position, ignite and adjust it so that height of flame becomes 25
and blue flame becomes stable.
G. Move burner flame to an end of a sample, and turn off the burner after
burning for 30 seconds or until flame reaches the marking line of 25 .
Measure the time of flame burning or red heating from the line of 25 to
the line of 100 of lower part of a sample, and calculate the burning
speed into /minute.
Repeat this test for the remaining 2 samples.
36.5 Decision of suitability
A. As the result of test, burning or red heating speed of all samples should
not exceed the following values.
- If the thickness of a sample is 3 : 40 /minute
- If the thickness of a sample is less than 3 : 75 /minute
Or, if burning or red heating does not reach the marking line of 100mm.
B. If one of 3 samples of a group is not suitable to the requirements of item
A, conduct the same test for the 3 samples of another group. All samples
of second group should satisfy all requirements of item A.
36.6 Preparation of a test certificate
Record the test result briefly in the Clauses A.8 and A of a test certificate and
make a decision. Record the detailed test result by using "Note#" if required.
TTAS.KO-09.0018/R1(2004.12)134
37. Flammability test for classifying Materials 5V
37.1 Corresponding Clause of Technical Standard : A.9
37.2 Purpose of test
To check fire resistance of material of 5 V class.
37.3 Test instruments
A. Ventilation hood : To prevent the possibility that toxic gas is generated
during the test. But, ventilation should not affect the test.
B. Bunsen burner : Inner diameter 9.5±0.5 , 100 from an air inlet, flame
expander-50
C. Gases whose heating value is 37MJ/ : Industrial Methane gas (maximum
purity 98.0 mole) or natural gas with a regulator and a gas flowmeter.
D. Temperature chamber with air circulation type
E. Calcium chloride dryer
F. Temperature and humidity chamber
G. Sample supporter
H. Horizontal steel wire net
I. Surgical sanitary cotton
37.4 Test method and procedure
A. This test is not applied to a sample with over 13 thick, but applied to the
test of Clause A.1. If the class is achieved as the test result of a sample
less than 13 , this class can be applied to a sample with the thickness up
to maximum 13 .
TTAS.KO-09.0018/R1(2004.12)135
B. 10 samples of bar form or 8 samples of plaque form are tested according
to a manufacturer's selection. If a sample of bar form is shrunk, extended
or melted, a sample of plaque form is tested.
C. Prior to test, pre-treat 5 samples of a group of bar form or 4 samples of
a group of plaque form in condition of temperature of 23±2 and relative
humidity of 45% ~ 55% for 48 hours.
D. Select the higher value of the temperature 10K higher than the maximum
value, which is applied in temperature rise test of Clause 5.1 of Technical
Standard, and 70 , and after pre-treating the remaining samples of group
1 (5 sample bars or 4 sample plaques) for 7 days (168 hours) in a
temperature chamber of air circulation type, cool down to room
temperature in a dryer with calcium chloride for 4 hours.
E. By using a Bunsen burner whose inner diameter is 9.5±0.5 and length is
100 from an air inlet, make test flame. When a burner, using gas whose
heating value is 37 MJ/ , is positioned vertically, adjust test flame so that
flame makes 130 high totally and the blue flame inside makes around 40
high.
F. In case of a sample of bar form, test 2 groups. Size of a sample is 130
long and 13 wide, thickness should be the value same as the thinnest
part used in an equipment (maximum 13 ).
G. Put a bar sample vertically and fix the rear end of it with a clamp of a ring
stand. Put the narrow edge to the direction of a burner. And put a layer of
cotton at the position of 300 below the part where test flame is applied.
TTAS.KO-09.0018/R1(2004.12)136
H. Apply flame to the lower edge of a sample at the angle of 20° for vertical
line so that blue flame contacts the sample.
Apply flame for 5 seconds and pause for 5 seconds, and repeat it 5 times.
After repeating 5 times, turn it off. And then check items as follows and
record.
- Sum of time of burning and red heating.
- Burnt length or damaged length
- Drops from a sample during the test.
- Transformation or change in physical strength when cooled down to room
temperature just after burning.
Total flame length
Supporter
Insideblue flame
Sample under test
(Fig. 37-1) Vertical burning test for the classification of 5V
I. In case of a plaque sample, 2 groups are tested. Size of a sample should
be 150 ×150 , and thickness should be the value same as the thinnest
part used in an equipment (maximum 13mm).
TTAS.KO-09.0018/R1(2004.12)137
J. Install samples of 4 groups, and test by applying test flame to each point
of each sample as follows.
A - Put a plaque sample of each group vertically, and apply flame to the
lower corner of a sample.
B - Put a plaque sample of each group vertically, and apply flame to the
lower edge of a sample.
C - Put a plaque sample of each group vertically, and apply flame to the
center of a side of a sample.
D - Put a plaque sample of each group horizontally, and apply flame to
the center of a bottom of a sample.
K. Put surgical cotton, which is not treated, at the place of 300 below from
the point where test flame is applied.
L. In case of applying flame vertically to a sample, apply test flame at the
angle of 20° for the vertical line.
M. In any case, the end of blue flame should reach a test plate. Apply for 5
seconds and pause for 5 seconds, and repeat it 5 times. In this case, test
flame should be applied to the same part 5 times.
N. After turing off 5th flame, check items as follows and record.
- Sum of time of burning and red heating.
- Burnt length or damaged length
- Any drops from a sample during test.
- Transformation or change in physical strength when cooled down to room
temperature just after burning.
TTAS.KO-09.0018/R1(2004.12)138
37.5 Decision of suitability
A. For the sample during the test,
- There should not be burning drops or particle which can ignite cotton.
- Burning time or red heating time should be shorter than 60 seconds
after turning off 5th test flame.
- A sample should not be burnt completely.
In case of a bar sample : a sample should not be shrunk, extended or
melted.
If a sample is shrunk, extended or melted, a plaque sample is tested on
the basis of procedures I to N.
In case of a plaque sample : There should not be significant damage at
the part where flame is applied as the test result of C, D of the above
test method J.
B. After the test of samples of each group, make a decision as follows.
a) If all samples satisfy the requirements of item A, it is classified as 5V
class.
b) If only one sample of a group is not suitable, repeat test for the
samples of other group in the same condition. If all samples of second
group satisfy the requirements, it is regarded as 5V class.
c) If over 2 samples of a group are not suitable, it is not regarded as 5V.
TTAS.KO-09.0018/R1(2004.12)139
37.6 Preparation of a test certificate
Record the test result briefly in the Clauses A.9 and A of a test certificate and
make a decision. Record the detailed test result by using "note #" if required.
TTAS.KO-09.0018/R1(2004.12)140
38. Motor tests under abnormal concitions
38.1 Corresponding Clause of Technical Standard : Appendix B
38.2 Purpose of test
To check the possibility of hazard by excessive temperature rise in abnormal
state of overload, rotor restraint and others of a motor used in an equipment.
38.3 Test instruments
A. Voltage regulator : 0-250Vac, 60 , 15A or equivalents
B. D.C. power supply : 0.30Vdc, over 10A
C. Proper restraint device
D. Dynamometer or eddy-current brake or proper overload device
E. Temperature recorder
F. Coil resistance meter.
38.4 Test method and procedure
TTAS.KO-09.0018/R1(2004.12)141
A. Selection of test applied. :
DC Motorof secondary
i it
YesNo
Conduct B.4 test①excluding motors as follows :
- as a motor used for air control only,one whose air propelling part isdirectly connected to a motor shaft
- as a shaded pole motor, one whosedifference between rotor restraint currentand load free current is lower than 1Aand the ration is lower than 2:1.
Conduct B.5 test②If appropriate, conduct test of③B.8, B.9, B.10
Conduct test of B.6, B7, B, 10 :
- A motor which is running inusual state of rotor restraint inproper function as a steepingmotor is excluded.
B. Test requirements
Select the more disadvantage voltage from the rated voltage and high①
limit voltage in the range of the rated voltage.
Test is done under the simulated condition inside of an equipment or on②
a working table. A separated sample under test can not be used in the
test by the simulated condition. The simulated condition includes the
followings.
- A protecting device protecting a motor inside of a finished equipment,
and
- Arbitrary device as one which plays the role of the heat sink plate of a
motor housing.
TTAS.KO-09.0018/R1(2004.12)142
Measure coil temperature by using a thermocouple or a resistance tester.③
In case of a thermocouple, attach it on the coil surface of a motor.
Measure the temperature when test for regulated time is completed, and
in other case, measure the temperature when temperature is stable, or
when fuse, overheat preventing device, or motor protecting device works.
In case of an impedance protecting motor which is sealed totally,④
measure the temperature by attaching a thermocouple to the housing of
a motor.
In case of testing a motor without a proper thermal protecting device in⑤
the simulated condition, correct the measured coil temperature in
consideration of the ambient temperature (measured during the
temperature rise test of Clause 5.1) at the point that a motor is usually
installed in an equipment.
In measurement of temperature, arithmetic average temperature should⑥
be calculated as follows.
While power of a motor is turned on and off repeatedly, draw the graph
of temperature and time for the corresponding test time, and the
arithmetic average temperature ( ) is :
; -average of maximum values, - average of
minimum values
Maximum value
Minimum value
Time
(Fig. 38-1)
TTAS.KO-09.0018/R1(2004.12)143
C. B.4 Overload operating test
Run a motor under normal load.①
While keeping the initial voltage applied to a motor, increase load②
gradually so that current increases step by step.
After reaching normal state, increase load again. In this way, increase③
load step by step until an overload protecting device works. However, at
this time, a rotor should not be in restraint state.
Measure and record the temperature of a motor coil for the stable cycle④
as shown in the above figure.
D. B.5 Rotor restraint overload test
Conduct a rotor restraint test at ambient temperature as room①
temperature.
Test time is as follows :②
- In case of a motor protected by proper impedance or external impedance,
run under the state of motor restraint for 18 days. However, when the
temperature of a motor coil, which is open type or sealed totally, reaches
a certain value, if it is lower than the value regulated in Clause 5.1 of
Technical Standard regarding the insulation system in use, the test can be
stopped at the time.
- If a motor has a protecting device of automatic reset type, run a motor
under the state of rotor restraint for 18 days.
- If a motor has a protecting device of manual reset type, run a motor
under the state of rotor restraint 60 times repeatedly. In this case, if a
protecting device works, reset it immediately. (However, it should be over
30 seconds.)
TTAS.KO-09.0018/R1(2004.12)144
- If a motor has a protecting device without reset function, run until t device
works.
Record temperature at regular interval for the first 3 days in case of a③
motor protected by proper or external impedance or a motor with a
protecting device of automatic reset type, during first 10th running in
case of a motor with a protecting device of manual reset type, or until
the protecting device works in case of a motor with a protecting device
without reset function.
Reference - Testing a protecting device of automatic reset type
continuously for over 72 hours and testing a protecting device
of manual reset type for over 10 times are to check if the
protecting device have the capability to interrupt the rotor
restraint
E. B.6 Overload operating test of a D.C. motor used in a secondary circuit
If it is expected that there is possibility of overload by inspection or as①
the result of checking the structure, conduct the overload operating test.
In case of the structure where the driving current is kept constant by an
electronic driving circuit, the test is not required.
Test by running a motor at the running voltage under normal load, and②
while keeping initial voltage applying to a motor, increase load gradually
so that current increases step by step. If it reaches normal state,
increase load again. In this way, increase load step by step until an
overload protecting device works or a coil is broken.
When temperature is constant at each step, measure the temperature of a③
motor coil.
TTAS.KO-09.0018/R1(2004.12)145
If it is not easy to measure exact temperature because a motor is small④
and its structure is not general, instead of measuring temperature,
checking the possibility of ignition by covering a motor with a layer of
cotton cloth of around 40g/ during the overload running test can be
substituted.
F. B7. A rotor restraint overload test of a D.C. motor used in a secondary
circuit.
A motor should satisfy the test of the following item . However, if it is① ③
not easy to measure exact temperature because a motor is small and its
structure is not general, the test method of following item can be④
conducted instead of item . Either one of the 2 tests should be done.③
If the running voltage of a motor exceeds peak voltage of 42,4V or D.C.②
60V, conduct the corresponding test of item or item , and then cool→ ↓
down the motor to room temperature. Conduct withstanding voltage test,
and the motor should be suitable to this test. In this case, test voltage
should be 0.6 times of the regulated value.
Apply running voltage to a motor and in state that a rotor is restrained,③
run the motor for the longer time of 7 hours time and the time that the
motor reaches normal state.
Install a motor on the lumber covered with a layer of the wrapping foil,④
and then cover the motor with a layer of a cotton cloth of around 40g/ .
Note - The wrapping foil is defined in ISO standard 4046 as follows.
"Wrapping paper should be a soft and light one used for
packing or wrapping of a gift to protect an article mostly
requiring handling with care and the weight should be 12 g/ to
30 g/ ."
TTAS.KO-09.0018/R1(2004.12)146
And then, apply running voltage to the motor, and in state that the rotor is
restrained, run the motor for the longer time of 7 hours time and the time
that the motor reaches normal state.
G. B.8. Test of a motor with a capacitor
In case of a motor with a phase invertible capacitor, short or open the①
capacitor(in the more disadvantageous state of the two) and test in state
that a rotor is restrained.
If a capacitor with the structure where the capacitor does not become the②
state of short circuit in trouble, the short circuit test of the capacitor is
not required.
H. B.9 A 3-phase motor
In case of a 3-phase motor, apply a normal load in state that a phase①
is not connected. However, if a motor is designed so that power can
not be applied to it by a circuit control device in state that even 1
phase is opened, this test is not required.
To check the influence by other load or a circuit inside of an equipment,②
in some case, the test for a motor can be done inside of an equipment
by opening each phase of 3-phase power in turn.
I. B.10 Test of a series motor
Applying as minimum load as possible, run a series motor at 1.3 times①
of the rated voltage for 1 minute.
TTAS.KO-09.0018/R1(2004.12)147
38.5 Decision of suitability
A. B4. Overload running test : The measured temperature should not exceed
the value indicated in Table B.2 of Technical Standard.
B. B.5 Rotor restraint overload test :
The measured temperature should not exceed the value regulated in①
Table B.2 of Technical Standard.
During the test, the bad insulation in a motor frame or the permanent②
damage including excessive deterioration of the insulation for a motor
should not happen, and a protecting device should work surely.
Included permanent damages to motors below.
- Generation of severe or long lasting smoke, or ignition.
- Electrical or mechanical trouble of auxiliary parts such as a capacitor
or a driving rely.
- Exfoliation of insulation, break or carbonation.
Discoloring of the insulator is allowable, but, when coils are rubbed by③
a finger, carbonation or breaks to the extent that insulator can be
exfoliated or broken is not allowable.
After the time regulated regarding measurement of temperature elapsed,④
and after cooling down, a motor should be suitable to the withstanding
voltage test. Test voltage should be 0.6 times of the regulated value.
C. B.6 Overload running test of a D.C. motor used in a secondary circuit :
- The measured temperature should not exceed the value of Table B.2 of
Technical Standard, or
TTAS.KO-09.0018/R1(2004.12)148
- If cotton cloth is used for the substitute test, it should not be ignited.
D. B7. Rotor restraint overload test of a D.C. motor used in a secondary
circuit :
- It should be suitable to the withstanding voltage test. Test voltage should
be 0.6 times of the regulated value.
- The measured temperature should not exceed the value of Table B.1 of
Technical Standard, or
- If wrapping foil or cotton cloth is used for the substitute test, it should
not be ignited.
E. B.8 Test of a motor with a capacitor :
The measured temperature should not exceed the value of Table B.1 of
Technical Standard,
F. B.9 3-Phase motor test :
The measured temperature should not exceed the value of Table B.1 of
Technical Standard.
G. B.10 Series motor test :
After the test, coil and connecting part should not be released, and hazard
regulated in this regulation should not happen.
TTAS.KO-09.0018/R1(2004.12)149
<Table 38-1> Allowable temperature of a motor coil (excluding overload running
test)
Maximum allowable temperature ( )
A class E class B class F class H class
Protection by proper or external
impedance150 165 175 190 210
Protection by a protecting device
working within one hour200 215 225 240 260
Protection by other protecting device
- Maximum value after one hour
- Arithmetic average value within 2
hours or 72 hours
175
150
190
165
200
175
215
190
235
210
<Table 38-2> Allowable temperature in overload running test
Limited temperature value ( )
A class E class B class F class H class
140 155 165 180 200
38.6 Preparation of a test certificate
Record brief test result and the decision of suitability in Appendix B. of a test
certificate form, and record the detailed value by using "Note#" if necessary.
TTAS.KO-09.0018/R1(2004.12)150
39. Ionizing radiation test
39.1 Corresponding Clause of Technical Standard : Appendix H
39.2 Purpose of test
Regarding an equipment which can radiate X-ray, to check if the quantity of
X-ray is hazardous for a human body.
39.3 Test instruments
A. Voltage regulator : 0-250 Vac, 60 , 15A or equivalent instrument
B. Radioactive ray quantity measuring system : Effective area 10
39.4 Test method and procedure
A. Run an equipment in most disadvantageous voltage of the rated voltage of
an equipment or, -10% or +6% of the rated voltage.
B. In case of a controller that a operator operates or a controller operated in
service, control the controller so that maximum quantity of X-ray is radiated
in the range that an equipment works in normal state.
C. An internal control device designed not to be adjusted for the life span of
the equipment is not regarded as a controller.
D. Measure the radiated quantity at the point of 5cm apart from an operator
accessible area.
39.5 Decision of suitability
The measured irradiation rate should less than 36 / . (At this time, consider
ambient radioactive ray quantity.)
TTAS.KO-09.0018/R1(2004.12)151
39.6 Preparation of a test certificate
Record the test result in Appendix H. of a test certificate form, and make the
decision of suitability.
TTAS.KO-09.0018/R1(2004.12)152
40. Test for thermal controls
40.1 Corresponding Clause of Technical Standard : Appendix K
40.2 Purpose of test
To check if an automatic temperature controller or a temperature limiter has
sufficient switching capacity.
40.3 Test instruments
A. Heater
B. Temperature recorder
40.4 Test method and procedure
A. Regarding 3 samples under test, conduct the appropriate test by the
Clauses K.2 and K.3 of Technical Standard or test by the Clause K.4, and
decide the suitability.
B. In case of a part with T mark, test the switching part of 1 sample at room
temperature, and test the switching part of the remaining 2 samples at the
indicated temperature.
C. In case of a part without the rating mark, test can be done in state that it
is installed in an equipment or test can be done regarding the part only
separately. Test can be done by the more convenient method of the two.
But, if the test for the part only is done separately, test condition should
be same with the condition inside of an equipment.
TTAS.KO-09.0018/R1(2004.12)153
D. If a part can not be tested separately, test 3 sets of equipments with the
part.
E. During the test, the switching speed can be made faster than the normal
switching speed of the case that an equipment works, except the case that
the possibility of break increases by increasing speed.
F. K.2 Automatic temperature controller test :
Apply the voltage of 1.1 times of the rated voltage or the voltage of 1.1①
times of high limit value in range of the rated voltage, and apply the
load of most disadvantageous condition which is generated in usual
operating, and operate the equipment.
By setting temperature up and down, operate an automatic temperature②
controller 200 times (appling voltage 200 times to the heater and
interrupting 200 times).
G. K.3 Automatic temperature controller test :
Apply the rated voltage or the high limit value of the rated voltage,①
and operate an equipment by applying normal load.
By setting temperature up and down, operate an automatic②
temperature controller 10,000 times (appling voltage 10,000 times to
the heater and interrupting 10,000 times).
H. K.4 Temperature controller test :
Apply the rated voltage or the high limit value of the rated voltage,①
and operate an equipment by applying normal load.
By setting temperature up and down, operate an automatic②
temperature controller 1,000 times (appling voltage 1,000 times to the
heater and interrupting 1,000 times).
TTAS.KO-09.0018/R1(2004.12)154
I. K.5 Overheat protecting device :
Operate an equipment under the condition regulated in Clause 5.1 of①
Technical Standard, decide the suitability.
Operate an overheat protecting device of automatic reset type 200 times,②
and operate an overheat protecting device of manual reset type 10 times
by resetting manually.
To prevent damage of the equipment, cool it down by force or pause.
40.5 Decision of suitability
A. Sequential arc should not happen during the test.
B. After the test, any serious damage that causes trouble in normal operation
should not happen to the equipment, and an electrical connecting part
should not be released.
C. Parts should endure the withstanding voltage test regulated in Technical
Standard, and in this case, the test voltage applied to the insulation part
between contacts should be double of the voltage applied when the
equipment works at the rated voltage or the high limit voltage in range of
the rated voltage.
D. An overheat-preventing device should work surely.
E. An automatic temperature controller, a temperature limiter, and an overheat
preventing device should have the structure where controlling position is
not changed remarkably by heat generated during the usual operation or
vibration.
TTAS.KO-09.0018/R1(2004.12)155
40.6 Preparation of a test certificate
Record the test result in the Clause 5.4.8 of a test certificate and the Clause
5.4 of an auxiliary table, and make a decision of suitability.
TTAS.KO-09.0018/R1(2004.12)156
Annex I
Opening a court particulars from 2nd petal.
Item First edition Second edition Remarks
12.3 C. PVB pipe (outer diameter : 51 ) PVB pipe Reflection of
present operating
situation of
test institutes and
Radio Research
Laboratory
Notification
(October
12, 2002) "Type
approval treatment
method)"
related to Attached
table 4.
16.3 E. Thermocouple of
Type K, No30 AWG
Thermocouple
17.3 B. Leakage current meter
(YEW type No.3226)
Leakage current
meter
by Appendix D of
Technical Standard
18.3 A. 0-50Vac and dc
60 100 maximum or
0-5000Vac and dc
60 or
18.3 B. 0-50KVac ~ or
equivalent
<Deleted>
20.3 F. Hot line Coil ohm meter Coil resistance tester
26.3 B.Leakage current meter
(YEW type No.3226)
Leakage current
meter
by Appendix D of
Technical Standard
28.3 A.0-5 ac/dc cut-off
current: 100
0-5 ac/dc
38.3 F. Hot Coil Ohm Meter Coil resistance tester
39.3 B.
Victoreen, 440RF/D or
equivalent instrument
(Radioactive ray
quantity measuring
system : Effective area
10 )
Radioactive ray
quantity
measuring system :
effective area 10
Contributors to Standard Write-up
Standard No. : TTAS.KO-09.0018/R1
The following individuals have contributed to enacting, amending, publishing of
the present standard.Task Name Committee & Position Contact Company
Assignment ProposalRadio Research
Laboratory/ETRI
First Standard Draft
Submission
Radio Research
Laboratory/ETRI
First Standard Draft
Review & Write-up
J.J. LeeChairman of DSL Project
Group042-870-8715 KT
Y.H. KimVice Chairman of DSL
Project Group042-860-6716 ETRI
J.H. ChoeVice Chairman of DSL
Project Group02-6266-4995
Hanaro
Telecom
M.J. Kang Staff of DSL Project Group 042-870-8736 KT
and 11 Committeemen of
DSL Project Group
Standard Draft
Editing &
Supervision
J.J. LeeChairman of DSL Project
Group042-870-8715 KT
Y.H. KimVice Chairman of DSL
Project Group042-860-6716 ETRI
J.H. ChoeVice Chairman of DSL
Project Group02-6266-4995
Hanaro
Telecom
M.J. Kang Staff of DSL Project Group 042-870-8736 KT
and 11 Committeemen of
DSL Project Group
Standard
Deliberation
G.S. Min
Chairman of
Telecommunication
Technical Committee
042)870-8340 KT
G.R. Park
Vice Chairman of
Telecommunication
Technical Committee
042)860-5290 ETRI
S.G. Kang
Vice Chairman of
Telecommunication
Technical Committee
042)860-6117 ETRI
I.Y. Jeong
Vice Chairman of
Telecommunication
Technical Committee
031)330-4229
Hankuk Univ.
of Foreign
Studies
and 18 Committeemen of
Telecommunication
Technical Committee
BureauS. Kim Chief of Team 031)724-0080 TTA
G.Y. O Section Manager 031)724-0081 TTA