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Dual RCD boards are unlikely to be suitable for EV charging installations even with type A or B RCDs, discuss

IronFreely

I’ll paraphrase Regulation 722.531.3.101, “each charging point shall be protected individually by an RCD”. With that in mind a dual RCD board where both RCDs protect multiple circuits will not be suitable as the requirement is for the charge point to be individually protected. The reason I open this up to discussion is because so many installers seem completely unaware of the wording of 722.531.3.101 as about 50% of the installations I see the charger is protected by an RCD protecting multiple circuits, in particular new builds were the provision for electric vehicle charging has been made during development. I also often give quotations to prospective clients where they’ve already had at least one quotation where the previous installer has said “great you’ve got a spare way in your dual RCD board, so we can use that” and I’m thinking “erm no you can’t”

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  • According to the Hager guide, there is no need for a secondary RCCB near the car charger if the Consumer Unit is a newer version that already has a Type A RCCB, as shown below. It shows a image of a split board with two type A RCCBs protecting individual MCBs

  • in reply to AMK

    Yes, I saw that as well… however I’d argue that BS7671 and the code of practice supersedes the opinion of one manufacturer.

    I rang up technical help once during an EICR for coding advice, the adviser after reading the regulation suggested a C3 if the RCD met disconnection times while a vehicle was charging but a C2 if not, and also suggested that although the EVCP would have 6mA RDC-DD protection the other circuits sharing the RCD would not and therefore a combined imposition of more than 6mA DC could occur without either the RDC-DD nor the RCD disconnecting under fault conditions. If for example the EVCP introduce 5mA DC and other circuits introduced say 2mA DC.

    interesting hey?

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  • in reply to AMK

    Yes, I saw that as well… however I’d argue that BS7671 and the code of practice supersedes the opinion of one manufacturer.

    I rang up technical help once during an EICR for coding advice, the adviser after reading the regulation suggested a C3 if the RCD met disconnection times while a vehicle was charging but a C2 if not, and also suggested that although the EVCP would have 6mA RDC-DD protection the other circuits sharing the RCD would not and therefore a combined imposition of more than 6mA DC could occur without either the RDC-DD nor the RCD disconnecting under fault conditions. If for example the EVCP introduce 5mA DC and other circuits introduced say 2mA DC.

    interesting hey?

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