EV chargepoint commissioning

The electrical, protective, control and handover checks that turn a fitted wallbox into a commissioned chargepoint.

Commissioning proves that an EV chargepoint is safe, works with the electrical installation and has been left in the settings on which the design depends. Powering the wallbox and pairing an app are only part of it.

The checks cover the fixed circuit, RCD and DC protection, supply earthing, open-PEN measure, load management, vehicle communication and the evidence handed to the customer.

Confirm the design before testing

The installation record identifies:

the supply earthing arrangement confirmed for the property
the supply capacity and assessed maximum demand
the dedicated circuit, cable route and protective device
the RCD and smooth-DC protection relied upon
the open-PEN measure where the vehicle can be exposed to true Earth on PME
any earth electrode and its exact purpose
the chargepoint’s maximum current and any load-management limit
the required DNO application or notification status
nearby conductive parts or other earthing systems around every usable parking position

If the installation depends on a CT clamp, cloud service or configured current limit to stay within the supply capacity, that dependency is part of the safety design and must be commissioned as such.

Inspection and electrical tests

Initial verification follows the applicable edition of BS 7671 and the chargepoint manufacturer’s instructions. It normally includes visual inspection and tests for continuity, insulation resistance, polarity, fault protection and the relevant RCD functions.

The sequence and test voltages matter because connected electronics can be damaged by an inappropriate insulation-resistance test. The installer should isolate or test around equipment exactly as the manufacturer and BS 7671 permit, then record any justified limitation. A copied “typical” resistance or loop-impedance target is not a pass criterion; the measured result is compared with the protective device and circuit design actually installed.

Inspection covers:

cable entries, seals, fixings and impact protection suit the location
conductors are correctly terminated and the enclosure is not strained
all live conductors are disconnected by devices that are required to do so
the board and devices are suitable for the sustained charging load
labels identify the circuit and any unusual earthing or isolation arrangement
the charging lead can be used without tension, crushing or a trip hazard

RCD and smooth-DC protection

Each Mode 3 charging point normally needs individual 30 mA RCD protection of a suitable type. The product evidence must identify the RCD’s recognised standard; a claim that an electronic function is “RCD-like” is not equivalent.

If the design uses a Type A or Type F RCD with 6 mA smooth-DC detection, both parts and the switching path must be identified. If the charger does not provide the required DC protection, the alternative is normally a Type B RCD.

Use suitable test equipment and the current BS 7671 procedure for the RCD. Check the built-in DC function and any internal RCD in the way prescribed by the manufacturer. The test button alone does not prove the fixed circuit, and an ordinary RCD test does not automatically prove the 6 mA DC function.

Open-PEN and electrode checks

Where an OPDD provides open-PEN protection, commissioning should follow its approved test method and prove the required isolation and reset behaviour without creating a dangerous network condition. Keep the device declaration, category, settings and result.

Where an earth electrode is used, record whether it is a TT protective electrode, supplementary electrode or measurement reference. Test it by the method appropriate to that duty and check the intended separation from PME-connected metalwork.

The final connected-vehicle area should be inspected for simultaneous contact with metalwork on another earthing system. A longer lead can move the relevant boundary well beyond the wallbox.

Vehicle communication and a functional charge

An EVSE test adaptor can simulate the vehicle connection states and confirm that the control-pilot sequence, contactor and advertised current behave correctly. The installer should check the socket or the vehicle end of a tethered lead, not just terminals inside the unit.

A controlled charge with a compatible vehicle provides a useful end-to-end check. Confirm that charging starts, stops and resumes as intended and that the vehicle does not draw more than the advertised or configured current. Cable locking and release should also work without forcing the connector.

Load management and fail-safe behaviour

For a CT-based system, compare the displayed site load with a known change in household demand. Check clamp direction, conductor, phase mapping and whether any separate consumer unit or generation path has been missed.

Then prove the outcome, not just the reading: as other demand rises, the charger should reduce or pause its load so the agreed site limit is respected. Record the charger limit, site limit, phase allocation and any minimum-current behaviour.

The design should also define what happens if the CT, communications link, controller or cloud connection fails. A loss of control must not allow charging above the limit on which the network or supply assessment relies.

Smart setup

The EVs (Smart Charge Points) Regulations apply to relevant chargepoints sold for domestic or workplace use in Great Britain. They address smart operation, continued charging when communications are lost, measurement, default schedules, randomised delay and security. The seller must provide the required statement of compliance; it is not created by the electrician’s circuit certificate.

At handover, connect the chargepoint using its supported communications method, apply required firmware, link the owner’s account and explain any default schedule or randomised delay. Confirm that the customer can override or change schedules as the product permits.

Do not leave installer credentials, a shared password or the installer’s personal account in control of the unit. Record who owns the device account and how control can be transferred when the property changes hands.

DNO and building-control records

The network operator must be informed of an EV chargepoint installation. The current ENA process uses Connect Direct for low-carbon-technology applications, and the installer should establish whether approval is required before connection or the case can follow an install-and-notify route. Keep the submission and DNO response with the handover pack.

Generation rules such as G98 and G99 are not the ordinary route for a unidirectional charger. Vehicle-to-grid equipment that exports is a different case.

In England and Wales, installing a new circuit in a dwelling is normally notifiable under the relevant building regulations. A registered installer can usually notify through a competent person scheme; otherwise building control must be involved. Scotland and Northern Ireland have their own building-control systems, so an England-only Part P description should not be applied across the UK.

Handover evidence

The handover pack includes, as applicable:

the Electrical Installation Certificate and schedule of test results
the building-regulations compliance record for the jurisdiction
DNO application, approval or notification evidence
chargepoint declaration of conformity and smart-regulations statement
RCD, RDC-DD and OPDD product evidence relied upon
electrode purpose and measured result
commissioning sheet with current and load-management settings
charger, cable and protective-device instructions
warranty and grant evidence where relevant
account-transfer, app and support details

The handover demonstration covers starting and stopping a charge, lead storage, schedules, protection or communications faults and emergency isolation. Safety settings are not ordinary app preferences.