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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. 



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  • 0
    By all means rename 'trick' to 'technique' if the use of the word concerns you - to me in this case  they are synonymous - 'tricks of the trade' clever ways of solving otherwise tricky = potentially difficult problems .

    However as a technique it is not as well understood / explained, and therefore not in as widespread use, as it could be.

    There are a few things surrounding earthing, RCDs and fault currents that catch the unwary - especially when folk raised on TNC-s  examples try and do things on a  TT site.
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  • 0
    By all means rename 'trick' to 'technique' if the use of the word concerns you - to me in this case  they are synonymous - 'tricks of the trade' clever ways of solving otherwise tricky = potentially difficult problems .

    However as a technique it is not as well understood / explained, and therefore not in as widespread use, as it could be.

    There are a few things surrounding earthing, RCDs and fault currents that catch the unwary - especially when folk raised on TNC-s  examples try and do things on a  TT site.
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