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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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    gkenyon:

    See Fig A722 in Amendment 1:2020.


    That's not in the Big Blue Book, I'll have to have a look online on the IET website, I am guessing we are heading off in the direction of how to use an isolation transformer for charging an electric vehicle.


    Andy betteridge.


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  • 0
    gkenyon:

    See Fig A722 in Amendment 1:2020.


    That's not in the Big Blue Book, I'll have to have a look online on the IET website, I am guessing we are heading off in the direction of how to use an isolation transformer for charging an electric vehicle.


    Andy betteridge.


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