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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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  • what tends to happen is they install an SWA cable on a 32A MCB which is terminated on the driveway in a wiska box… technically it’s fully compliant as it would only be non compliant when the charger itself is installed…

    Am I missing something here? Provided the EVSE has 30mA RCD protection included - which most seem to claim they do (presuming it does actually comply with the required standards, which has been questioned for one or two models) wouldn't 722.531.3.101 be satisfied even if the circuit was fed by an MCB?

       - Andy.

  • in reply to AJJewsbury

    Some new house/flat builders do not know what they are asking for or how to check.  They don't know, that they don't know.


    So lets break it down for them.

    Cable from CU to EVSE point (Wiska Box). 2.5mm2 CSA SWA is not the same as 6mm SWA or a 6mm EV-Ultra.  The Ethernet cores in the Ultra can be used for CT or load management or load shedding.  A 2.5mm SWA may be compliant and be classed by the Marketing people for the house seller as EV ready.



    In the CU/DB a MCB is not the same as an RCBO.  Now that we are talking Residual Current what use is a 30mA type AC in a dwelling.  Still being fitted as we speak/type.  It needs to be a minimum of type A.  A Blank or MCB or RCD type AC may be compliant and be classed by the Marketing people for the house seller as EV ready.


    The last one which makes me chuckle.  A Wiska box (other brands are available) on the outside wall and no EVSE insight without having to pay more.  It may be compliant and be classed by the Marketing people for the house seller as EV ready.

  • in reply to AJJewsbury

    I have recently completed the installation of a 22kW charging unit which purports to include Residual Current Device (RCD) protection, specifically an AC 30mA type and DC 6mA. However, it does not conform to any established British Standards, such as BS 61008; consequently, the installation of an additional RCD at the circuit’s origin was necessitated to ensure compliance and safety

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  • in reply to AJJewsbury

    I have recently completed the installation of a 22kW charging unit which purports to include Residual Current Device (RCD) protection, specifically an AC 30mA type and DC 6mA. However, it does not conform to any established British Standards, such as BS 61008; consequently, the installation of an additional RCD at the circuit’s origin was necessitated to ensure compliance and safety

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