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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

Parents
  • 0

    I am pretty sure on an NICEIC webinar i watched the other day they stated that all EV charge points should have a dedicated RCD. I took that to include the supply circuit if it needed one but could be wrong.  

    Gary

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  • 0

    I am pretty sure on an NICEIC webinar i watched the other day they stated that all EV charge points should have a dedicated RCD. I took that to include the supply circuit if it needed one but could be wrong.  

    Gary

Children
  • 0 in reply to aligarjon

    Yes you are correct. But there are many installed in a shared rcd. Not ideal and not something I would do but I wouldn't consider it dangerous.

    There are many things that should be done that are being dropped in the race to the bottom on pricing, but no one is enforcing the rules so a fully company ev install is unusual fro  what I have seen.

    Personally I always try to push for a dedicated rcd but the majority don't.

  • 0 in reply to aligarjon

    A circuit which has mechanical protection or in a wall deeper than 50mm do not require RCD protection also sub-mains to out buildings as this is not classed as a final circuit but distribution. 
    so in this case it’s SWA does not need RCD protection and the RCD is incorporated inside the EV charger. If there was no RCD inside the EV charger then Type A is required, that’s my understanding. 

  • 0 in reply to Yassir Khalil

    Agreed the charger circuit does not need the protection as the charger has a built in RCD. But the RCD is also protecting other circuits and it will still be blinded by DC leakage from the charger.

  • 0 in reply to aligarjon

    I believe the code of practice says dedicated circuit, not dedicated RCD. 

  • 0 in reply to Yassir Khalil

    A Type B may be required. A type A is suitable when the charger (or circuit) incorporates a RDCDD. If there is no RDCDD then a type B RCD is required. Details in section 5.6.1 of the code of practice or 722.531.3.101 of the big brown book

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