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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?

  • 0 in reply to Benyamin Davodian
    Benyamin Davodian said:
    Fixing the mobile ramp made of rubber or white from Triflex Asphalt Repro - a strong and durable material used to create a quality ramp with a high carrying capacity.
    The tests performed to prove this you can contact a civil engineer and get the answer.
    I am a mechanical engineer specializing in the vehicle and I gave an interview and no publicity, so I can not answer you the question that is not in my professional field and it is a question that is more about a civil engineer.

    I'm not 100 % sure that would satisfy BS 7671 requirements for a cable route.

    In any case, it's definitely not something we are considering in this thread, which relates to how the supply transformer and distribution cable is earthed ... whether the fault is in the vehicle connecting cable, or the vehicle itself, is totally irrelevant ... the fault we are discussing in this thread is in the electrical distribution system that supplies the premises.

    In terms of the use of products like this in the UK, we would always recommend the charging equipment is installed close to the vehicle, and the tethered lead or connecting cable kept as short as possible.

    I have experience with similar products used with armoured cables in other countries, which have led to armoured cables being damaged in a relatively short period of time, which is why I think it is very important to specify standards for such products, to ensure they achieve the required objectives.

  • 0 in reply to gkenyon

    Good morning Mr. gkenyon,
    Each country has its own standards, good to know and thank you very much for the update.

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