Checklists for Various Requirements Checklists to be Used

Checklists for Inspection and Testing of New L.V.Installations

Checklist 1, 2, 3 and 4

Checklists for Periodic Inspection and Testing of L.V.Installations:

Connected to supply before 1.1.1985 Checklist 1

Connected to supply on or after 1.1.1985 and before1.6.1992

Checklist 1 and 2

Connected to supply on or after 1.6.1992 Checklist 1,2, and 3

Click here to see Checklist 1Click here to see Checklist 2Click here to see Checklist 3Click here to see Checklist 4

Checklist No. 1Tested by/Date

(N/A if not applicable)

(a) Switchboards, circuit breakers and main switches

(i) No visible damage to impair safety.

(ii) Safe access provided.

(iii) Every circuit breaker, main switch and fuseholder(s) provided with up-to-date, legible anddurable rating labels giving their ratings.

(iv) Every circuit breaker and main switchprovided with a legible and durableidentification label.

(v) An up-to-date schematic diagram displayed toshow the main distribution system.

(vi) Link of adequate size installed in neutralcircuit.

(vii) All accessible live parts screened withinsulating plate or earthed metal.

(viii)The overload and fault current protectioncharacteristics of all circuit breakers verifiedwith secondary injection test instrumentswhere appropriate.

(ix) Lowest insulation resistance being Mohms (not less than 0.5 Mohm) measuredbetween phases/neutral/earth.

(x) All exposed conductive parts effectivelyearthed with a maximum earth fault loopimpedance being ohms.

(b) Busbar trunking system including rising mains

(i) No visible damage to impair safety.

(ii) Phase identification marked on both ends ofmain cable/conductor, and at terminations.

(iii) All joints of metal conduit or trunking to bemechanically sound, electrically continuousand protected against corrosion.

(iv) All accessible live parts screened with aninsulating plate or earthed metal.

(v) Lowest insulation resistance being Mohms (note less than 0.5 Mohm) measuredbetween phases/neutral/earth.

(vi) All metal conduit or trunking effectivelyearthed with a maximum earth fault loopimpedance being ohms.

Tested by/Date(N/A if not applicable)

(c) Meter board/box

(i) No visible damage to impair safety.

(ii) Safe access provided.

(iii) All exposed metal parts effectively earthedwith a maximum earth fault loop impedancebeing ohms.

(d) Overhead lines

(i) No visible damage to impair safety.

(ii) A minimum height of metresfrom ground (not less than 5.8 metres forlines acrossing any place accessible tovehicular traffic, 5.2 metres in other places ornot less than the tallest height restriction ofmetres).

(iii) Lowest insulation resistance being Mohms (not less than 0.5 Mohm) measuredbetween phases/neutral/earth.

(iv) All metal work associated with every steelpole effectively earthed.

(e) Main cables

(i) No visible damage to impair safety.

(ii) Cables protected against mechanical damage.

(iii) Correct phase identification provided at bothends of the cable.

(iv) Lowest insulation resistance being Mohms (not less than 0.5 Mohm) measuredbetween cores and cores to earth.

(v) All exposed metal parts including the cablearmour effectively earthed with a maximumearth fault loop impedance being ohms.

(f) Distribution board

(i) No visible damage to impair safety.

(ii) No fuse installed in the neutral circuit.

(iii) All live parts screened with an insulatingplate or earthed metal.

(iv) Phase identification provided on thedistribution board.

Tested by/Date(N/A if not applicable)

(v) Insulation resistance of not less than 0.5Mohm measured between phases/neutral/earth.

(vi) All exposed metal parts effectively earthed.

(g) Final circuits

(i) No visible damage to impair safety.

(ii) All non-armoured cables susceptible todamage protected with steel conduit /trunking. Bushing and rubber grommet,where necessary, provided.

(iii) Conductor sized to suit the rating of thefuse/MCB protecting the circuit.

(iv) All joints of metal conduits or trunking tobe mechanically sound, electricallycontinuous and protected against corrosion.

(v) For temporary installation, cables lying onthe ground or attached to scaffoldingsecured on suitable supports.

(vi) Insulation resistance of not less than 0.5Mohm measured between phases/neutral/earth.

(vii) All metal conduits, trunking, switch boxesand exposed metal parts effectively earthed.

(viii)Residual current devices function properly.

(ix) Earth fault loop impedance and polarities ofevery outlet checked.

(h) Motors

(i) No visible damage to impair safety.

(ii) Insulation resistance of not less than 0.5Mohm measured between phases/neutral/earth.

(iii) All exposed conductive parts effectivelyearthed.

(i) Earthing

(i) No visible damage to impair safety.

(ii) All exposed conductive parts of the wiringinstallation connected to the earthingterminal with appropriate protectiveconductors.

Tested by/Date(N/A if not applicable)

(iii) Bonding/earthing connection to water pipe/gas pipe/duct effectively connected.

(j) Neon signs

(i) No visible damage to impair safety.

(ii) The fireman’s switch clearly labelled.

(iii) All high voltage equipment enclosed in anearthed metal box fitted with a ‘DANGER’and ‘危險’ warning notice.

(iv) All live parts screened with an insulatingplate or earthed metal.

(v) High voltage cables securely supported withglass or glazed porcelain.

(vi) Insulation resistance of the L.V. circuitbeing Mohms (not less than 0.5Mohm) between phases/neutral/earth.

(vii) All exposed metalwork permanently andeffectively bonded and earthed with amaximum earth fault loop impedance of ohms measured at L.V. side.

Checklist No. 2Tested by/Date

(N/A if not applicable)

(a) Earth

(i) A warning notice ‘SAFETY ELECTRICALCONNECTIONDO NOT REMOVE’ and‘安全接地終端切勿移去’ provided at allmain earthing and bonding connections.

(ii) Main equipotential bonding conductorseffectively connected to main water pipes,main gas pipes, other services pipes/ductingand exposed metallic parts of structuralframework.

(iii) Supplementary equipotential bondingeffectively provided between exposedconductive parts and extraneous conductiveparts of less than 2 m apart.

(iv) Exposed conductive parts of fixed equipmentinstalled outside equipotential zoneeffectively earthed for 0.4 sec. disconnection.

(v) Exposed conductive parts of fixed equipmentother than item (iv) effectively earthed for 5sec. disconnection.

(vi) Effectiveness of the main equipotentialbonding connection to the lightningprotection system.

Checklist No. 3Tested by/Date

(N/A if not applicable)(a) Substations

(i) A warning notice ‘DANGER-SUB-STATION, UNAUTHORISED ENTRYPROHIBITED’ and ‘危險電力分站，未

經授權不得內進 ’ provided at everyentrance of substations.

(ii) Suitable locking facilities provided for H.V.substations.

(iii) Suitable lighting provided.

(iv) Suitable ventilation provided.

(v) Entrance/exit free of obstruction.

(b) Switchrooms

(i) A warning notice ‘DANGER-ELECTRICITY, UNAUTHORISEDENTRY PROHIBITED’ and ‘危險有

電，未經授權不得內進’ provided at everyentrance of switchrooms.

(ii) Suitable locking facilities provided for H.V.switchrooms.

(iii) Suitable lighting provided.

(iv) Suitable ventilation provided.

(v) Entrance/exit free of obstruction.

(c) Switchboards, circuit breakers and main switch

An up-to-date notice of periodic inspection andtesting provided at point of supply (i.e. aswitchboard, a circuit breaker or a distributionboard) of the installation.

(d) Distribution boards

(i) A warning notice ‘DANGER’ and ‘危險’provided on the front panel of everydistribution board.

(ii) A notice of periodic testing provided at ornear the main distribution boardincorporating a residual current device.

Checklist No. 4Tested by/Date

(N/A if not applicable)

(a) Switchboards, circuit breakers and main switches

(i) Safe access and adequate clearance spaceprovided.

(ii) Number of source of supply: andthe rating of each of them :

(iii) Maximum loading approved by theelectricity supplier:

(iv) Suitable interlock scheme provided toprevent parallel operation of two or moresources of supply and 4-pole incoming andinterconnecting circuit breakers provided forsupply to be taken from more than onesource and is interconnected.

(v) Electrically and mechanically interlocked4-pole changeover device(s) where standbygenerator set(s) is installed.

(vi) The breaking capacity of the main switch is kA and all circuit breakers/inter-connection devices are able to withstand theprospective fault current.

(vii) Protective relays have been correctly set andovercurrent protective devices suitably set forall circuits.

(viii)Protective type C.T. are used for protectiverelays.

(ix) A means of isolation provided for everycircuit.

(x) Operation of circuit breakers and mainswitches checked.

(xi) Control, indication and alarm functionschecked.

(xii) No undersized conductor used between themain busbar and fuse/MCB’s.

(xiii)Fuses/MCB’s matching the lowest ratedconductor in the circuit.

(xiv)Suitable cable terminations provided.

(xv) Cable conductors of correct phasesconnected.

Tested by/Date(N/A if not applicable)

(xvi)Single-pole devices for protection orswitching connected in phase conductorsonly.

(b) Busbar trunking system including rising mains

(i) The current rating of the rising mains is

amperes.

(ii) The rising mains, lateral mains and meterboards positioned at places accessiblefrom public area.

(iii) Fire barriers provided where the busbartrunking system passes through floor slabsor walls designated as fire barriers.

(iv) Cables passing through smoke lobbyprotected by enclosures of adequate firerating.

(v) Non-sheathed cables protected by conduit,trunking or ducting.

(vi) Busbar trunking systems, cables andductings adequately supported.

(vii) Armoured cables properly terminated tometal casing or trunking by proper cableglands.

(viii) Suitable cable lugs used for terminatingcables.

(ix) Precaution against corrosion taking onaluminium conductor joined to copperconductor.

(x) Cutout fuses for tapping-off supply fittedwith insulated carriers.

(c) Overhead lines

(i) A steel carrier wire provided betweenpoles to prevent strain on conductor.

(ii) substantial steel poles used to suspendcables crossing vehicular passes.

(iii) Overhead cables supported on suitableinsulators.

(iv) Suitable stay wires installed on the terminalpoles and on each pole at which the linechanges its direction.

Tested by/Date(N/A if not applicable)

(v) Minimum clearance of overhead lines toground, roads and obstacles maintained.

(d) Main cables

(i) The cross-sectional area or each core of themain supply cable is mm2.Number of cables in parallel, if connectedis .

(ii) Armoured cables properly terminated tometal casing or trunking by proper cableglands.

(iii) Cables passing through smoke lobbyprotected by enclosures of adequate firerating.

(iv) Non-sheathed cables protected by conduit,trunking or ducting.

(v) Cables and ductings adequately supported.

(vi) Cables at distribution board or busbarterminated with cable lugs.

(vii) Main cables connected up with correctpolarity.

(e) Distribution board

(i) Safe access and adequate clearance spaceprovided.

(ii) Distribution boards securely mounted onsuitable supports.

(iii) A suitable switch provided to control eachdistribution board.

(iv) Phase barriers for 3-phase distributionboard provided.

(v) The breaking capacity of MCB is kA to Code 9.

(v) Suitable tools for withdrawal of fuses at afuse-board provided, where necessary.

(f) Final circuits

(i) All fuses and single pole switchesconnected to the phase conductors only withcorrect polarity.

(ii) Wiring for emergency lightings and fireservices installation segregated from otherwirings.

Tested by/Date(N/A if not applicable)

(iii) Low voltage circuits segregated from extralow voltage circuits.

(iv) Cables of all phases and neutral of thecircuit bunched and contained in the sameconduit.

(v) Exposed insulated non-sheathed cablesprotected.

(vi) Wiring inside false ceiling protected byconduit/trunking or metallic sheath.

(vii) Socket outlets installed below 1.5 m fromfloor being shuttered type complying to theprescribed requirements.

(viii) No socket outlet installed close to water tap,gas tap or cooker so as to avoid danger.

(ix) Floor socket outlets protected with suitablecover.

(x) No 2-pin sockets installed. All socketoutlets connected with protectiveconductors and live conductors terminatedat correct terminals.

(xi) Radial final circuits using 5A/15A socketoutlets in compliance with Code 6D.

(xii) Final circuits using 13A socket outlets incompliance with Code 6E.

(xiii) Final circuits using industrial socket outletsin compliance with Code 6F or 6G or 6H.

(xiv) Circuit protection conductor is formed bythe enclosure and a separate protectiveconductor between the earthing terminal ofsocket outlet and its associated metal boxprovided.

(xv) Circuit protective conductor is not formedby the enclosure and a separate protectiveconductor to the earthing terminal ofsocket outlet provided.

(xvi) Residual current device of 30 mA ratedresidual operating current provided for allsocket outlets.

(xvi) Means of isolation provided for everyfixed appliance.

Tested by/Date(N/A if not applicable)

(xviii)All chokes, starters and capacitors ofdischarge lamps enclosed in earthed metalbox(es) and suitably ventilated.

(xix) Phase conductors connected to the centrecontact of the Edison-type screw lampholders.

(xx) No switches other than a switch fed from asafety source or operated by an insulationcord or rod or a push-button type of switchhaving an insulated button of a largesurface area provided in bathrooms.

(xxi) No socket outlet other than those speciallydesigned with isolation transformersinstalled in bathroom/shower rooms.

(xxii) No fixed luminaire nor fixed heater havingunguarded heating elements installedwithin reach of a person using the bath orshower.

(xxiii)Appliances exposed to weather beingsplashproof type.

(xxiv)Luminaires, switches, sockets and plugs,cable couplers installed outdoor, beingsplashproof type.

(xxv) General/site lighting readily accessible tothe public supplied from a safety source.

(xxvi)General/site lighting not readily accessibleto the public and not supplied from asafety source, protected by RCD having arated residual operating current notexceeding 30 mA.

(g) Motors

(i) A local switch provided to control everymotor.

(ii) Means provided to prevent unexpectedrestarting of motors where such restartingmight cause danger.

(iii) Flexible conduits terminated with suitablebrass bushes.

(iii) Separate supply to motor heaters having itsterminals screened, with warning noticeprovided.

Tested by/Date(N/A if not applicable)

(h) Earthing

(i) Rod electrode(s) having a minimumdiameter 12.5 mm copper or 16 mmgalvanised or stainless steel used.

(ii) Copper tape electrode having a cross-section of not less than 25 mm x 3 mm.

(iii) Copper plate electrode not less than 3 mmin thickness and having a maximumdimension of 1200 mm x 1200 mm.

(iv) No gas/water pipe used as earth electrodes.

(v) A test link provided at the main earthingterminal.

(vi) Minimum size of protective conductor usedin the installation being not less than 2.5mm2 and PVC insulated.

(vii) Protective conductor up to and including 6mm2 with green and yellow insulationsheath used throughout its length.

(viii) Bonding conductors of mm2 (notless than 150 mm2 copper equivalent) usedfor connection to the earthing terminal ofthe electricity supplier's transformer(s).

(ix) Bonding conductors of mm2 (notless than 150 mm2 copper equivalent) usedfor connection to the exposed conductiveparts of the electricity supplier'sunderground cable(s).

(x) Copper links provided at joints of metallictrunking which forms part of a protectiveconductor.

(xi) Separate protective conductors provided forall flexible conduits.

(i) High voltage discharge lighting (Neon signs)

(i) ampere control switch fittedwith a removable handle or lockingfacilities.

(ii) Fireman's switch provided with the ‘OFF’position at the top.

Tested by/Date(N/A if not applicable)

(iii) High voltage cables exceeding 1 metre inlength for connection between lamps andtransformers, being metal sheathed orarmoured.

(iv) Bare or lightly insulated conductors for highvoltage connection protected with glasstubing.

(j) Warning notices and labels

(i) Warning notices for substations andswitchrooms provided in compliance withCode 17.

(ii) Warning notices for earthing and mainbonding connections provided incompliance with Code 17.

(iii) All switchgears, distribution boards andelectrical equipment properly labelled.