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EV charging point - no for protection

Dave Thomas

At a customers house today, he asked me to add an outside socket. There's a spare way in an IP65 consumer unit outside next to the intake. On inspection, it's supplied off  a Henley block, it's not a sub board, but there's no RCD protection, just a surge protection device. There's a standard bs7671 label about testing the rcd, that's all..

I''m not registered to fit EV points so the customer can't claim any grants like he could of this person: but surely unless I'm missing something,they can't be a spark if they think the SPD is going to provide supplementary electric shock protection. They are a proper registered EV installation  firm, are they right and I'm wrong? Do I report it? To who? What if he fits them all like this? 

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    Does the EV charger have a built-in RCD?  Many of those that do were originally marketed as not requiring external RCD protection, unless the installation method of the supply cable required it.

    It has since been clarified that the RCD protecting the charger must comply with a standard such as IEC 61008, and a lot of the built-in RCDs used do not.  This means that in most cases now an EV charger will need an RCD in the distribution board supplying it, and many of the manufacturers now make this clear. 

    However, if the charger in question was installed a year or two ago and has a built-in RCD, it is likely that at the time the manufacturer advised it to be installed in this way, with only an MCB in the distribution board.  Many other electricians did the same then - myself included.  If this is the case I wouldn't take any action about it.  It isn't dangerous, as the built-in RCD should operate in the event of a fault.

    Obviously, if the EV charger does NOT have built-in RCD protection, or if the cable is buried in the wall or requires RCD protection for another reason, that's a different story!

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    Does the EV charger have a built-in RCD?  Many of those that do were originally marketed as not requiring external RCD protection, unless the installation method of the supply cable required it.

    It has since been clarified that the RCD protecting the charger must comply with a standard such as IEC 61008, and a lot of the built-in RCDs used do not.  This means that in most cases now an EV charger will need an RCD in the distribution board supplying it, and many of the manufacturers now make this clear. 

    However, if the charger in question was installed a year or two ago and has a built-in RCD, it is likely that at the time the manufacturer advised it to be installed in this way, with only an MCB in the distribution board.  Many other electricians did the same then - myself included.  If this is the case I wouldn't take any action about it.  It isn't dangerous, as the built-in RCD should operate in the event of a fault.

    Obviously, if the EV charger does NOT have built-in RCD protection, or if the cable is buried in the wall or requires RCD protection for another reason, that's a different story!

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