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WHAT WOULD YOU DO?

John Peckham
Today's job inspect and test a domestic installation in a sheltered housing flat. TN-C-S earthing system. Main protective bonding correct. 


Wet room for disabled occupant. Electric shower and extract fan supplied from a Wylex 2 way consumer unit  with BS EN 61008 30mA RCD main switch. Recently installed.


RCD does not trip on X1 RCD test but does trip on X 5 and operation of test button. RCD does not tip on a second and third test after X 5 test and operation of the test button.


Thinking about the Note to Regulation 643.8 are you content with this installation as there are no other observations recorded and prepared to issue a "Satisfactory" EICR?


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    I'm sure John already tried this, but to be honest I've seen similar issues myself, which magically disappear when you use a different make or model of tester, or when you temporarily install the RCD in another location.


    I'm not convinced in these cases, whether it's some issue with an electrical waveform or interference, which is treated differently by the RCD, and/or the tester - i.e. the RCD may or may not be faulty and there's no way of knowing without sending it for extensive testing.


    I've had similar experience where RCDs pass x1 with flying colours, but fail x5 (and occasionally this is consistent with different testers).
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  • 0
    I'm sure John already tried this, but to be honest I've seen similar issues myself, which magically disappear when you use a different make or model of tester, or when you temporarily install the RCD in another location.


    I'm not convinced in these cases, whether it's some issue with an electrical waveform or interference, which is treated differently by the RCD, and/or the tester - i.e. the RCD may or may not be faulty and there's no way of knowing without sending it for extensive testing.


    I've had similar experience where RCDs pass x1 with flying colours, but fail x5 (and occasionally this is consistent with different testers).
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