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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
    Can`t we cheat that one in a similar manner?

    At best it will only check the RCD itself is working under those conditions (Fake TNC-S) and not the actual conditions on site but hey ho better than not testing at all methinks
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  • 0
    Can`t we cheat that one in a similar manner?

    At best it will only check the RCD itself is working under those conditions (Fake TNC-S) and not the actual conditions on site but hey ho better than not testing at all methinks
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