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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
    Or indeed got everyone in the caravan to stay in and everyone outside to stay out, and done the test that may make it live - modern  test instruments automatically cut-off before the dangerous time/voltage product is reached,


    I'd be happy with 2 tests, one to fire the first RCD using the CPC, and then a second to fire the second RDC using the neutral trick and  just getting in and out quickly. A transformer is something else to go wrong, and temporarily installing one for the test duration is probably as likely to hinder as to help and not very practical.


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  • 0
    Or indeed got everyone in the caravan to stay in and everyone outside to stay out, and done the test that may make it live - modern  test instruments automatically cut-off before the dangerous time/voltage product is reached,


    I'd be happy with 2 tests, one to fire the first RCD using the CPC, and then a second to fire the second RDC using the neutral trick and  just getting in and out quickly. A transformer is something else to go wrong, and temporarily installing one for the test duration is probably as likely to hinder as to help and not very practical.


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