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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

    I think what you describe is probably OK, because in an unsmoothed DC fault that the AC type might fail on,  the A type will trip and remove the blinding fault, so long as that leads to double pole isolation.

    M,

  • 0 in reply to mapj1

    So is it only DC faults that can cause a problem then and not the fact that there are DC components in circuit ?

  • 0 in reply to aligarjon

    My understanding is that ev chargers and other products can produce dc leakage currents during normal operation.

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  • 0 in reply to aligarjon

    My understanding is that ev chargers and other products can produce dc leakage currents during normal operation.

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