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EV chargers in basement car parks - earthing

GHEC

I'm working on a project that will have a few 7kW single phase EV chargers fed from a three phase system.

The chargers will be located in the car park in the basement of the building. The chargers have built-in type B RCDs.

I was hoping someone might be able to provide some guidance in relation to the earthing arrangement. 

Strictly speaking, the chargers are "indoors" and within the equipotential zone. But since the installation is in the basement, would it be best to treat it as an outdoor installation and allow for installing separate earth rods? Or will this be problematic with any potential metalwork in the ground?

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    Section 8.2.3 of the IET Code of Practice for EV Charging Equipment Installation (4th Edition) begins with the following, if PME aplies:

    8.2.3 PME Supply
    Inside Buildings
    For electric vehicle charging equipment installations supplied from installations with a     PME supply (part of a TN-C-S system), the charging equipment may be connected to the PME earthing arrangements if the charging equipment is located inside the building and if it can be ensured that the vehicle being charged will always be within that same building (for example an underground car park, multi-storey car park, and so on).

    Balancing loads is recommended, though.

    I agree with what Lyle says about the issues associated with a separate earthing arrangement in this particular case.


    What is probably more tricky and worrying would be a fire risk assessment - has this already been carried out, or the existing one been updated to take into account EV fires?

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  • 0

    Section 8.2.3 of the IET Code of Practice for EV Charging Equipment Installation (4th Edition) begins with the following, if PME aplies:

    8.2.3 PME Supply
    Inside Buildings
    For electric vehicle charging equipment installations supplied from installations with a     PME supply (part of a TN-C-S system), the charging equipment may be connected to the PME earthing arrangements if the charging equipment is located inside the building and if it can be ensured that the vehicle being charged will always be within that same building (for example an underground car park, multi-storey car park, and so on).

    Balancing loads is recommended, though.

    I agree with what Lyle says about the issues associated with a separate earthing arrangement in this particular case.


    What is probably more tricky and worrying would be a fire risk assessment - has this already been carried out, or the existing one been updated to take into account EV fires?

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