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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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    Paul Robinson:


    I have an acquaintance who asks why his IET 18th Edition RCD tester when plugs it in to the Local RCD 


    Paul , Swindon LN IET. 



     


    From the original post, I was specifically exploring how to do the RCD test by plugging the tester in, rather than dismantling the installation. 


    The answer is use the test button on the RCD apart from when annual servicing is being carried out, then the cover needs to come off the consumer unit.


    Andy Betteridge


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  • 0
    Paul Robinson:


    I have an acquaintance who asks why his IET 18th Edition RCD tester when plugs it in to the Local RCD 


    Paul , Swindon LN IET. 



     


    From the original post, I was specifically exploring how to do the RCD test by plugging the tester in, rather than dismantling the installation. 


    The answer is use the test button on the RCD apart from when annual servicing is being carried out, then the cover needs to come off the consumer unit.


    Andy Betteridge


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