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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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    The RCD is definitely on the edge of tripping, the imbalance on the tails is around 20-27 mA. The main earth has 9.5 mA running through it.


    I was pondering a collapsing magnetic field when the jaws are opened.


     Andy B.
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  • 0
    The RCD is definitely on the edge of tripping, the imbalance on the tails is around 20-27 mA. The main earth has 9.5 mA running through it.


    I was pondering a collapsing magnetic field when the jaws are opened.


     Andy B.
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