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Electrical Commissioning Checklist

Low Voltage (L.V.) Installation
Working Space and Facilities

Adequacy working space and safe access provided for switch room and /or electrical facilities.

Entrance /exit to switch room and/or electrical facilities are free of obstruction.

Suitable locking facilities provided for switch room and /or electrical facilities.

Suitable lighting provision provided for switch room and /or electrical facilities.

Suitable ventilation provision provided for switch room and /or electrical facilities.

Suitable tools for withdrawal of fuses at fuse board provided.

A warning notice ‘DANGER—UNAUTHORISED ENTRY PROHIBITED’ provided at every entrance of switch room.

Fire barriers and other measures for protection against thermal effects are properly installed.

Danger notices, warning notices, schematic diagrams, instructions and similar information are correctly and adequately provided.

Warning notices for substations and switch rooms provided in compliance.

Warning notices for earthing and main bonding connections provided in compliance.

All switchgears, distribution boards and electrical equipment properly labelled.

Switchboard, Main Switch and Circuit Breaker

An up-to-date notice of periodic inspection and testing provided at point of supply (i.e. a switchboard, a circuit breaker or a distribution board) of the installation.

Circuits, fuses, switches, terminals, etc. are provided with a legible and durable identification label.

No visible damage to impair safety.

Work done properly recorded in logbook.

An up-to-date schematic diagram displayed.

All accessible live parts screened with insulating plate or earthed metal.

All exposed conductive parts effectively earthed.

Earthing system effectively connected.

Warning notice displayed at main bonding connections.

All protective devices are functioned properly and correctly set.

Suitable interlock scheme provided to prevent parallel operation of two or more sources of supply and 4-pole incoming and interconnecting circuit breakers provided for supply to be taken from more than one source and is interconnected.

Electrically and mechanically interlocked 4-pole changeover device(s) where standby generator set(s) is installed.

The breaking capacity of all circuit breakers /interconnection devices are able to withstand the prospective fault current.

Protective relays have been correctly set and overcurrent protective devices suitably set for all circuits.

Protective type current transformers are used for protective relays.

A means of isolation provided for every circuit.

Operation of circuit breakers and main switches checked.

Control, indication and alarm functions checked.

No undersized conductor used between the main busbar and fuse/MCB’s.

Fuses/MCB’s matching the lowest rated conductor in the circuit.

Suitable cable terminations provided.

Cable conductors of correct phases connected.

Single-pole devices for protection or switching connected in phase conductors only.

Distribution Board

A warning notice ‘DANGER’ provided on the front panel of every distribution board.

A notice of periodic testing provided at or near the main distribution board incorporating a residual current device.

Distribution boards securely mounted on suitable supports.

A suitable switch provided to control each distribution board.

Phase barriers for 3-phase distribution board provided, where necessary.

The breaking capacity of MCB is compliant.

Suitable tools for withdrawal of fuses at a fuse board provided, where necessary.

Circuits connected to MCB or fuse in accordance with the schematic diagram.

Conductors, Cables and Wiring

No visible damage to impair safety.

All live conductors and their methods of insulation, in relation to design currents of circuits and to the operating currents of the protective devices, are properly selected and erected.

All cables, flexible cords, switches, plugs and socket outlets, accessories and equipment are found to be in good working conditions.

All conductors are correctly and securely connected and identified.

Armored cables properly terminated to metal casing or trunking by proper cable glands.

Cables passing through smoke lobby protected by enclosures of adequate fire rating.

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

Cables and ductings adequately supported.

Cables at distribution board or busbar terminated with cable lugs

Main cables connected up with correct polarity.

Cables protected against mechanical damage and suitably supported.

All exposed metal parts including the armor effectively earthed.

Final Circuits

All fuses and single pole switches connected to the phase conductors only with correct polarity.

Wiring for emergency lightings and fire services installation segregated from other wirings.

Low voltage circuits segregated from extra low voltage circuits.

Cables of all phases and neutral of the circuit bunched and contained in the same conduit.

Exposed insulated non-sheathed cables protected.

Wiring inside false ceiling protected by conduit/trunking or metallic sheath.

Socket outlets installed below 1.5m from floor being shuttered type complying with the prescribed requirements.

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

Floor socket outlets protected with suitable cover.

No 2-pin sockets installed. All socket outlets connected with protective conductors and live conductors terminated at correct terminals.

Radial final circuits using 5A/15A socket outlets in compliance.

Circuit protective conductor is formed by the enclosure and a separate protective conductor between the earthing terminal of socket outlet and its associated metal box provided.

Circuit protective conductor is not formed by the enclosure and a separate protective conductor to the earthing terminal of socket outlet provided.

Residual current device having a rated residual operating current not exceeding 30mA provided for all socket outlets.

Minimum sizes of protective conductors are provided as per requirement for limitation of protective conductor impedance.

Means of isolation provided for every fixed appliance.

All chokes, starters and capacitors of discharge lamps enclosed in earthed metal box(es) and suitably ventilated.

Phase conductors connected to the center contact of the Edison-type screw lamp holders.

No switches other than a switch fed from a safety source or operated by an insulation cord or rod or a push-button type of switch having an insulated button of a large surface area provided in bathrooms.

Shaver supply unit is compliant

No fixed luminaire nor fixed heater having unguarded heating elements installed within reach of a person using the bath or shower.

Appliances exposed to weather being splash-proof type.

Luminaires, switches, sockets and plugs, cable couplers installed outdoor, being splash proof type.

General/site lighting readily accessible to the public supplied from a safety source.

General/site lighting not readily accessible to the public and not supplied from a safety source, protected by RCD having a rated residual operating current not exceeding 30mA.

Completion

Additional Comments

Checked by
Witnessed by
Contractor Name & Signature

Electrical Commissioning Checklist

Created by: SafetyCulture Staff | Industry: General | Downloads: 25

This electrical commissioning checklist is used for the commissioning of low voltage installations in a building. Use this checklist to verify the compliance of the switchboard, main switch and circuit breaker, distribution board, and final circuits with client specifications. This checklist has been designed to make it easier for inspectors to check the working space and facilities and conductors, cables and wiring.

Signup for a free iAuditor account to download and edit this checklist. It will be added to your free account and you will be able to conduct inspections from your mobile device.

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Electrical Commissioning Checklist

Low Voltage (L.V.) Installation
Working Space and Facilities

Adequacy working space and safe access provided for switch room and /or electrical facilities.

Entrance /exit to switch room and/or electrical facilities are free of obstruction.

Suitable locking facilities provided for switch room and /or electrical facilities.

Suitable lighting provision provided for switch room and /or electrical facilities.

Suitable ventilation provision provided for switch room and /or electrical facilities.

Suitable tools for withdrawal of fuses at fuse board provided.

A warning notice ‘DANGER—UNAUTHORISED ENTRY PROHIBITED’ provided at every entrance of switch room.

Fire barriers and other measures for protection against thermal effects are properly installed.

Danger notices, warning notices, schematic diagrams, instructions and similar information are correctly and adequately provided.

Warning notices for substations and switch rooms provided in compliance.

Warning notices for earthing and main bonding connections provided in compliance.

All switchgears, distribution boards and electrical equipment properly labelled.

Switchboard, Main Switch and Circuit Breaker

An up-to-date notice of periodic inspection and testing provided at point of supply (i.e. a switchboard, a circuit breaker or a distribution board) of the installation.

Circuits, fuses, switches, terminals, etc. are provided with a legible and durable identification label.

No visible damage to impair safety.

Work done properly recorded in logbook.

An up-to-date schematic diagram displayed.

All accessible live parts screened with insulating plate or earthed metal.

All exposed conductive parts effectively earthed.

Earthing system effectively connected.

Warning notice displayed at main bonding connections.

All protective devices are functioned properly and correctly set.

Suitable interlock scheme provided to prevent parallel operation of two or more sources of supply and 4-pole incoming and interconnecting circuit breakers provided for supply to be taken from more than one source and is interconnected.

Electrically and mechanically interlocked 4-pole changeover device(s) where standby generator set(s) is installed.

The breaking capacity of all circuit breakers /interconnection devices are able to withstand the prospective fault current.

Protective relays have been correctly set and overcurrent protective devices suitably set for all circuits.

Protective type current transformers are used for protective relays.

A means of isolation provided for every circuit.

Operation of circuit breakers and main switches checked.

Control, indication and alarm functions checked.

No undersized conductor used between the main busbar and fuse/MCB’s.

Fuses/MCB’s matching the lowest rated conductor in the circuit.

Suitable cable terminations provided.

Cable conductors of correct phases connected.

Single-pole devices for protection or switching connected in phase conductors only.

Distribution Board

A warning notice ‘DANGER’ provided on the front panel of every distribution board.

A notice of periodic testing provided at or near the main distribution board incorporating a residual current device.

Distribution boards securely mounted on suitable supports.

A suitable switch provided to control each distribution board.

Phase barriers for 3-phase distribution board provided, where necessary.

The breaking capacity of MCB is compliant.

Suitable tools for withdrawal of fuses at a fuse board provided, where necessary.

Circuits connected to MCB or fuse in accordance with the schematic diagram.

Conductors, Cables and Wiring

No visible damage to impair safety.

All live conductors and their methods of insulation, in relation to design currents of circuits and to the operating currents of the protective devices, are properly selected and erected.

All cables, flexible cords, switches, plugs and socket outlets, accessories and equipment are found to be in good working conditions.

All conductors are correctly and securely connected and identified.

Armored cables properly terminated to metal casing or trunking by proper cable glands.

Cables passing through smoke lobby protected by enclosures of adequate fire rating.

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

Cables and ductings adequately supported.

Cables at distribution board or busbar terminated with cable lugs

Main cables connected up with correct polarity.

Cables protected against mechanical damage and suitably supported.

All exposed metal parts including the armor effectively earthed.

Final Circuits

All fuses and single pole switches connected to the phase conductors only with correct polarity.

Wiring for emergency lightings and fire services installation segregated from other wirings.

Low voltage circuits segregated from extra low voltage circuits.

Cables of all phases and neutral of the circuit bunched and contained in the same conduit.

Exposed insulated non-sheathed cables protected.

Wiring inside false ceiling protected by conduit/trunking or metallic sheath.

Socket outlets installed below 1.5m from floor being shuttered type complying with the prescribed requirements.

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

Floor socket outlets protected with suitable cover.

No 2-pin sockets installed. All socket outlets connected with protective conductors and live conductors terminated at correct terminals.

Radial final circuits using 5A/15A socket outlets in compliance.

Circuit protective conductor is formed by the enclosure and a separate protective conductor between the earthing terminal of socket outlet and its associated metal box provided.

Circuit protective conductor is not formed by the enclosure and a separate protective conductor to the earthing terminal of socket outlet provided.

Residual current device having a rated residual operating current not exceeding 30mA provided for all socket outlets.

Minimum sizes of protective conductors are provided as per requirement for limitation of protective conductor impedance.

Means of isolation provided for every fixed appliance.

All chokes, starters and capacitors of discharge lamps enclosed in earthed metal box(es) and suitably ventilated.

Phase conductors connected to the center contact of the Edison-type screw lamp holders.

No switches other than a switch fed from a safety source or operated by an insulation cord or rod or a push-button type of switch having an insulated button of a large surface area provided in bathrooms.

Shaver supply unit is compliant

No fixed luminaire nor fixed heater having unguarded heating elements installed within reach of a person using the bath or shower.

Appliances exposed to weather being splash-proof type.

Luminaires, switches, sockets and plugs, cable couplers installed outdoor, being splash proof type.

General/site lighting readily accessible to the public supplied from a safety source.

General/site lighting not readily accessible to the public and not supplied from a safety source, protected by RCD having a rated residual operating current not exceeding 30mA.

Completion

Additional Comments

Checked by
Witnessed by
Contractor Name & Signature