8 Elect Inst Single Phase measurement
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Transcript of 8 Elect Inst Single Phase measurement
MECHANICAL & ELECTRICAL WORKS
MEASUREMENT (SBEQ3213) Week 8 : Electrical Installations – Single Phase
Sr. Dr. Sarajul Fikri Mohamed
Faculty of Built Environment
Cold Water Installations PLUMBING WORKS
Electrical Installations
Fire Fighting System
MAIN COURSE COMPONENTS
Air Conditioning Installations
Unit/Split Package/Central
Single Phase Three Phase
ELECTRICAL WORKS
MECHANICAL WORKS
Soil & Waste Pipes/Sanitary Fittings
Underground Drainage
1. Electrical installations: main components
2. SMM2 measurement rules for electrical installations
3. Taking off list for electrical installations
4. Heading and description.
5. Case study: CADANGAN MEMBINA DEWAN
SERBAGUNA TAMAN KOTA JAYA, KOTA TINGGI, JOHOR
TABLE OF CONTENTS
© 2009 Sarajul Fikri Mohamed
ELECTRICAL INSTALLATIONS AND MAIN COMPONENTS
POWER TRANSIMISSION & DISTRIBUTIONS
• From substation to substation
External Supply
• From DB to power points and fittings
Internal Supply • 240V with
a less load and domestic use
Single Phase
• 415V with a bigger load and supply needed for (commercial and industrial)
Three Phase
Two options
TYPES OF ELECTRICAL WORKS INSTALLATIONS
Carrying voltage is 415 v and can exceed 880 v for industrial user. The industries that use heavy machineries such as steel factory and cement factory need to have three phase electrical system.
Three phase systems may have three live wire and neutral wire
Live wires identified based on colour coded and the code are as follows:
LI or R (red): Single Phase
L2 or Y (yellow): Second Phase
L3 or B (blue) : Three Phase
For domestic uses, three phase voltage are very high and dangerous to the home owner Therefore, low voltage electrical supply normally used for domestic use such residential Standard voltage for single phase is 240 v. Normally one live wire will be used with one neutral wire. The code are as follows:
RN YN BN
Three Phase
Single Phase
SINGLE AND THREE PHASE THEORY
INCOMING SERVICES
MAIN INSTALLATION
POWER INSTALLATION
LIGHTING INSTALLATION
CABLES
ELECTRICAL APPLIANCES
CONDUIT AND FITTING
LIGHTNING PROTECTION SYSTEM
TESTING
MAIN COMPONENTS ELECTRICAL INSTALLATIONS – SINGLE PHASE
INCOMING SERVICES
MAIN INSTALLATION
POWER INSTALLATION
LIGHTING INSTALLATION
ELECTRICAL APPLIANCES
FINAL SUB-CIRCUIT
CABLE
CONDUIT
LIGHTNING PROTECTION
TESTING
ELECTRICAL DISTRIBUTION IN BUILDING
POWER
INSTALLATION
LIGHTING
INSTALLATION
ELECTRICAL
APPLIANCES
3 pin switch socket Fluorescent light
Wall light
EXIT sign
High bay light
EL light
Exhaust fan
Sweep ceiling fan
CONDUIT &
FITTING
CABLES TESTING
Chased into brickwall
Ceiling level
2x1c/2.5mm PVC cable
2x1c/1.5mm PVC cable
On completion of the electrical installation test all switches, switch socket, wiring etc and make good all defects an leave everything perfect working order to the satisfaction of the S.O and TNB
MAIN COMPONENTS ELECTRICAL INSTALLATIONS
ELECTRICAL TYPICAL LEGEND IN M&E DRAWINGS
DB & FUSES ELCB
MAIN SWITCH FUSE
TNB METER
CUT OFF FUSE
© 2009 Sarajul Fikri Mohamed
SMM2 MEASUREMENT RULES
MEASUREMENT RULES ELECTRICAL INSTALLATION
29
CLAUSE DESCRIPTION
R4-R5 Equipments and Control Gear
R6-R8 Fittings and Accessories
R9-R13 Conduits, trunking and cable tray
R14-R17 Cabling
R18 Final Sub-circuits
R19 Earthing
R20-R21 Ancillaries
R22 Sundries
R23-R24 Builder’s Work
RELATED SMM2 CLAUSES ELECTRICAL INSTALLATIONS
PREAMBLE
GENERAL NOTES
1) MAIN INSTALLATION
– Meter panel (no)
– Main Switch Board (no)
– Distribution Board (no)
Main & sub main cabling (m)
Conduit and trunking (m)
Sundries (no)
Testing (item)
2) POWER INSTALLATION
– Fittings and accessories
• Socket (no)
• Point (no)
– Cables (m)
– Conduits (m)
– Sundries
• Mark the holes (item)
• General earth bonding (item)
• Testing (item)
TAKING OFF LIST ELECTRICAL INSTALLATIONS
3) LIGHTING INSTALLATION – Fittings & accessories
• Swicth (no) • Point (no)
– Final sub-circuit (no) – Sundries
• Mark the holes (item) • General earth bonding (item) • Testing (item)
4) ELECTRICAL APPLIANCES
– Fittings & accessories
• Swicth (no)
• Exhaust fan, ceiling fan (no)
– Final sub-circuit (no)
– Sundries
• Mark the holes (item)
• General earth bonding (item)
• Testing (item)
5) LIGHTNING INSTALLATION (3 phase) – Copper tape (no) – Test clamps (no) – Air termination (no) – Earth chamber(no)
6) SUNDRIES
• Mark the holes (item) • Testing (item)
7) BUILDERS WORK
– Excavation trenches (m)
TAKING OFF LIST ELECTRICAL INSTALLATIONS
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
ELEMENT: ELECTRICAL SERVICES ubb/N/01
BIL UNIT KUANTITI
A Preamble
B
M 3.05
M 3.05
C
M 1.00
M 1.00
To Collection
All quantities in this bill are provisional quantities
subject to remeasurement upon construction of the
said item. The tenderer must allow for testing the
electrical installation and handling over of test
certificate to S.O.
Incoming Services-Externally (All Provisional)
25mm x 25mm Telekom PVC trunking from lighting
arrestors run at high level and drops to computer
server.
100mm UPVC class 'D' pipe complete with long
bend extended beyond drain for entry of TNB,
incoming cable to MSB inclusive of excavation and
backfilling.
4 x 25mm² pilestas (AC) cable in UPVC class 'D'
pipe (m/s) buried underground to TNB panel.
75mm x 38mm electrical trunking from meter to
DB/M3B.
Incoming Services-Internally (All Provisional)
Cadangan Membina Dan Menyiapkan Sebuah Makmal Komputer Di Sekolah Kebangsaan Sri
Selangor, Petaling Jaya, Selangor.
KETERANGAN HARGA
(RM)
JUMLAH
(RM)
BILLS OF QUANTITIES FOR:
INCOMING SERVICES
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
EQUIPMENT AND CONTROL GEAR (NO)
R4 – Equipment (generator, motors)
Control gear (isolator, switch fuses)
Packaged item described with a manufacturer’s detail.
Limiting dimension on size shall be given.
Connecting cable ends or cable tails shall be deemed to be included with the item.
Platework and supporting steelwork – Section P.
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
Equipment and Control Gear
Main Installation - Manufacturer’s details and dimension on size
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
Usually for houses and small loaded.
Situated inside building.
Including equipment such as circuit breaker and fuse
SMM2 Refer to clause R.4.1(NO.)
DISTRIBUTION BOARD ELECTRICAL INSTALLATIONS
HEADING AND DESCRIPTION MAIN INSTALLATIONS 1. EQUIPMENT AND CONTROL GEAR
Item Description Unit Qty Note
A
B
Equipment and Control Gear
240 volt metal clade main switch board, 1 phase of wall mounted floor standing type and including fuse swithches, RCCV’s, copper busbar, voltmeter, ammeter, current transformer, light indicator, cable box and all associated accessories. TNB metre board control gear complete with cut out fuse holder and neutral link with facilities for termination of incoming supply cable for wiring connection main switch distribution board and fuses 60A current operated ELCB complete with earthing elctrode.
No
No
2
1
MEASUREMENT RULES ELECTRICAL INSTALLATION
2. Power Installation - fitting & accessories = socket no - cables m - conduits m - final sub-circuit no - sundries
= mark holes item = general bonding item = testing item
TAKING OFF LISTS DOMESTIC – HOUSING SINGLE
PHASE
Switch socket outlet & socket point.
Different Types for different capacity.
SMM2 Refer to clause R.18.2 (No.)
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
HEADING AND DESCRIPTION POWER INSTALLATIONS 2. POWER INSTALLATIONS (Internally)
Item Description Unit Qty Note
A
B
Cables
2 x 1.5mm2 Polyvinyl chloride (cu) and 1.5mm2 PVC green cable in concealed conduit, chased in brickwall 1450mm above floor finish. 2 x 2.5mm2 Polyvinyl chloride (cu) and 2.5mm2 PVC green cable in concealed conduit, chased in brickwall 900 mm above floor finish.
Conduit
20mm diameter PVC conduit embedded into brickwall 1450mm above floor finish level.
Fitting and Accessories
1 Gang 13 Amp switch socket outlet with PVC face plate, steel box and fused plug top fixed to brickwall mounted and connected at 1450mm above floor finish level
m
m
m
No
35
20
35
18
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
CONDUIT, TRUNKING AND CABLE TRAYS
R9.1 – Conduit and fittings. (m)
a) type
b) size
c) specification
d) saddles & crampets pattern
e) nature of background
Except for final sub-circuit (measured overall conduit fittings) e.g tees, elbows, bend, cover plates, bushes, locknuts, nipples, stopping-lugs and reducing bushes), short running lengths and branches).
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
PVC Conduit
Galvanized Iron Conduit
CONDUIT, TRUNKING AND METAL TRAY ELECTRICAL INSTALLATIONS
CONDUIT, TRUNKING AND CABLE TRAYS
Classification :
a) conduits fixed to surfaces
b) conduits fixed in chases
c) conduits embedded in floor screeds
d) conduits embedded in concrete
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
Conduit inside the suspended ceiling
CONDUIT, TRUNKING AND METAL TRAY ELECTRICAL INSTALLATIONS
Conduits fixed in chases brick wall
CONDUIT, TRUNKING AND METAL TRAY ELECTRICAL INSTALLATIONS
Drilling works to chases wiring to the brickwall
CONDUIT, TRUNKING AND METAL TRAY ELECTRICAL INSTALLATIONS
12/31/2014
MEASUREMENT RULES ELECTRICAL INSTALLATION
CABLES
R15.1 – Cables (m) measured as the net length of the conduit, trunking or tray.
other cable measured as fix (without any allowance for sag) between boxes, equipment control gear, fittings, accessories etc.
except for final sub-circuits.
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
Cables
R15.2 Cables (m)
i) Type ii) Size iii) Classification
CLASSIFICATION
a) drawn into conduits or ducts
b) laid or drawn into trunking
c) laid or drawn into trunking and laced into ciucuit
d) fixed to surfaces
e) wrapped around pipework
f) laid in trenches
g) fixed to insulators in overhead lines
h) suspended from catenary cables
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
Underground cable Bracket to wall Embedded to wall
CABLE CLASSIFICATION ELECTRICAL INSTALLATIONS
CABLE
R17 Connections to public mains, making good public highway and other work which may only carried out by Public Undertaking or Local Authority – PROVISIONAL SUM
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
FINAL SUB-CIRCUITS
R18.1 Distribution sheets and drawing showing layout shall be given.
R18.2 Points (NO) i) cable & conduit installations
ii) ampere rating
iii) classification CLASSIFICATION a) Lighting points: one way or two way b) Socket or switch socket points c) Immersion heater points, cooker outlet points etc.
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
3. Lighting Installation - fittings & accessories = switch no - cables m - conduits m - final sub circuit no - sundries = mark holes item = general bonding item = testing item
TAKING OFF LISTS DOMESTIC – HOUSING SINGLE PHASE
HEADING AND DESCRIPTION LIGHTING INSTALLATIONS 3. LIGHTING INSTALLATIONS (Internally)
Item Description Unit Qty Note
A
B
C
D
E
Cables
2 x 1.5mm2 Polyvinyl chloride (cu) and 1.5mm2 PVC green cable in concealed conduit, chased in brickwall 1450mm above floor finish. 2 x 2.5mm2 Polyvinyl chloride (cu) and 2.5mm2 PVC green cable in concealed conduit, chased in brickwall 900 mm above floor finish.
Conduit
20mm diameter PVC conduit embedded into brickwall 1450mm above floor finish level.
Fitting and Accessories
1 X 36w bare channel wall fluorescent light fitting come with prismatic diakon diffuser
26W downlight complete with fittings wire, connector blocks and fixed to brickwork or concrete on ceiling surface. Connect to fix lamps
m
m
m
No
No
12
30
12
18
20
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
4. Electrical Appliances - fitting & accessories = switch no - cables m - conduits m - final sub circuit… no - sundries = mark holes item = general bonding item = testing item
TAKING OFF LISTS DOMESTIC – HOUSING SINGLE PHASE
HEADING AND DESCRIPTION POWER INSTALLATIONS 4. ELECTRICAL APPLIANCES (Internally)
Item Description Unit Qty Note
A
B
C
D
E
Cables
2 x 8mm2 PVC cable in concealed galvanised iron conduit come with 1 x 8mm2 PVC CPC Conduit
25mm diameter PVC galvanised iron conduit concealed to brickwall for exhaust fan
Fitting and Accessories
150mm x150mm metal exhaust fan install at high level complete with support brackets, flexible connectors and vibration. 1 gang 15 Amp switch outlet for exhaust fan with PVC plate box and fixed to brick wall
Final Sub-Circuit Final sub-circuit fir 15A socket point for metal exhaust fan of concealed conduit cable installation consisting od 2 x 8mm2 single core cable drawn into galvanised iron conduit.
m
m
No
No
No
15
35
5
5
5
Fan, MATV point and telephone point.
SMM2 Refer to clause R.6, R.22.1 (NO.)
ELECTRICAL APPLIANCE ELECTRICAL INSTALLATIONS
Cable
Life
Neutral
Pow
er
Fuse Box
Earth
Socket
Light Point
Switch
Cable
Final Sub-circuit
Life
Neutral
Ligh
tin
g
Fuse Box
Cable (m)
Final sub-circuit (nos)
Stating the ampere rating based on classification of
point.
FINAL SUB-CIRCUIT ELECTRICAL INSTALLATIONS
SUNDRIES
R22.1 Marking the position of holes, mortice, chases & the like (ITEM)
R22.2 General earth bonding & earthing (ITEM)
R22.3 Disconnecting, setting aside & refixing equipment (ITEM)
R22.4 Temporary operating each installation (ITEM)
R22.5 Testing each installation (ITEM)
R22.6 Preparing plans or diagrams of the installations (ITEM)
MEASUREMENT RULES ELECTRICAL INSTALLATIONS
© 2009 Sarajul Fikri Mohamed
TAKING OFF LIST
Preamble
General notes
Main installation
– Meter panel (no)
– Main Switch Board (no)
– Distribution Board (no)
Main & sub main cabling (m)
Conduit and trunking (m)
Sundries (no)
Testing (item)
Power installation
– Fittings and accessories
• Socket (no)
• Point (no)
– Cables (m)
– Conduits (m)
– Final sub circuit (no)
– Sundries
• Mark the holes (item)
• General earth bonding (item)
• Testing (item)
TAKING OFF LIST ELECTRICAL INSTALLATIONS
Lighting installation – Fittings & accessories
• Swicth (no) • Point (no)
– Final sub-circuit (no) – Sundries
• Mark the holes (item) • General earth bonding
(item) • Testing (item)
Lightning installation – Copper tape (no) – Test clamps (no) – Air termination (no) – Earth chamber(no) – Sundries
• Mark the holes (item) • Testing (item)
Builders work – Excavation trenches (m)
TAKING OFF LIST ELECTRICAL INSTALLATIONS
THANK YOU for your kind attention