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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

  • 0 in reply to AJJewsbury

    From Wikapedia Direct current (DC) is one-directional flow of electric charge.So the output from a bridge rectifier would meet this definition. I have seen it described as pulsating DC. I wonder if pulsating DC has a different impact on an RCD coil compared to smoothed DC.

  • 0 in reply to mapj1

    Most interesting. A good find.

    Drawings (espacenet.com)

    Z.

  • 0

    That link returns an error Z, I think you will have to go one page back to make it work. However I have a different idea, which I think should work. If the loop tester has a transformer core with a winding coupling the L and N conductors so that the loop test current is also induced in the neutral (or this is the way it is injected with this TX), then the RCD should not trip but one can measure the L-N current so the loop test value. Has anyone seen that in any kit?

  • 0 in reply to Zoomup

     

    truncated link - what were you aiming to link to.

    Mike

    PS patent searches are a very useful tool sometimes

  • 0 in reply to mapj1

    In the cable, yes, but in the vehicle and EVSE (downstream of the pilot circuit), you may be back to insulated N, and exposed-conductive-part as PE?

  • 0 in reply to IronFreely

    But the reg. refers to the LOAD CURRENTS NOT HAVING D.C. COMPONENTS, not D.C. electronic components.  It's a copnfusing unclear statement.

  • 0

    The latest post on this topic has been slipped in before posts from five days ago, there's absolutely no continuity to the discussion anymore on this forum. 

    When will it be accepted that this forum is no longer fit for purpose and it changed to a sensible and logical format that presents the discussion as a continuing conversation?

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