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Caravan RCD trip power connections

Paul R
Dear all , a holiday question


I have an acquaintance who asks why his IET 18th Edition RCD tester when plugs it in to the Local RCD (<30mA/300mS) , the primary supply RCD trips (that is further up the AC supply line) , rather than the caravan’s, so in effect nullifying the test.

Is this because the Primary Supply RCD  is monitoring a small standing current from other connections and the Local RCD needs to be tested by using the Local Earth at the unit ? ( which is not so easily accessible). 


Are there any other thoughts please ? 


Paul , Swindon LN IET. 



Parents
  • 0
    Wouldn't this provide electrical separation to more than one item of equipment if used on a caravan or mobile/transportable unit?


    I'm not a big fan of that idea, especially as the RCD test will actually introduce a fault ... and I may be in contact with exposed-conductive-parts at the same time ... for example when resetting the RCD in a transportable unit with metal CU !


    I think I'd prefer to simply connect the caravan or unit to a socket-outlet with additional protection by 30 mA RCD in accordance with Regulation 411.3.3 or 708.415, and conduct the "up/down" test on the RCD in the caravan or mobile/transportable unit !
Reply
  • 0
    Wouldn't this provide electrical separation to more than one item of equipment if used on a caravan or mobile/transportable unit?


    I'm not a big fan of that idea, especially as the RCD test will actually introduce a fault ... and I may be in contact with exposed-conductive-parts at the same time ... for example when resetting the RCD in a transportable unit with metal CU !


    I think I'd prefer to simply connect the caravan or unit to a socket-outlet with additional protection by 30 mA RCD in accordance with Regulation 411.3.3 or 708.415, and conduct the "up/down" test on the RCD in the caravan or mobile/transportable unit !
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