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Regulation stating a type AC RCD can not be upstream from a type A RCD

Alan B

Hi

I found an EV charger today with built in type A RCD + RDC-DD connected to a type AC RCD in the consumer unit, the AC RCD is also protecting 3 other circuits including sockets. I know this is incorrect because the type AC RCD could be blinded by DC currents, but I am struggling to find a regulation to reference when providing information to the customer?

Thanks

Alan

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  • 0

    If the Wiring Regulations had required Type A RCDs or at least recommended them for as long as the rest of Europe has been installing them we would not have such a big issue with appliance manufacturers making appliances that require Type A RCDs.

    Now we are in the situation where we need appliances specifically manufactured to allow them to be used within UK or millions of homes need their electrical installations upgraded.

    The simple answer is that millions of homes really do need their electrical installations upgraded, but in the meantime people are going to end up having issues with RCDs that aren’t fit for purpose, on top of all the other issues.

    It will be interesting to see if any social housing landlords decide they need to go through all their properties and replace any Type AC RCDs with Type A, that will keep their electricians busy.

    And yes, I have seen 30 mA RCDs being blocked with a higher rated upfront RCD, the the downstream RCD failing to when tested.

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  • 0

    If the Wiring Regulations had required Type A RCDs or at least recommended them for as long as the rest of Europe has been installing them we would not have such a big issue with appliance manufacturers making appliances that require Type A RCDs.

    Now we are in the situation where we need appliances specifically manufactured to allow them to be used within UK or millions of homes need their electrical installations upgraded.

    The simple answer is that millions of homes really do need their electrical installations upgraded, but in the meantime people are going to end up having issues with RCDs that aren’t fit for purpose, on top of all the other issues.

    It will be interesting to see if any social housing landlords decide they need to go through all their properties and replace any Type AC RCDs with Type A, that will keep their electricians busy.

    And yes, I have seen 30 mA RCDs being blocked with a higher rated upfront RCD, the the downstream RCD failing to when tested.

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