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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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  • 0

    Effectiveness is deemed to have been verified where an RCD meeting the requirements of Regulation 415.1.1

    disconnects within 40 ms when tested at a current equal to or higher than five times its rated residual operating

    current.




    well, to only do a 5 times test meets the letter of the regs. which I think is not really an adequate standard for a case like this, especially considering what is being protected.

    However, additional testing above the bare minimum reveals that it is clearly not working right after all, and really needs changing soon. 

    In your shoes I might do a a few  more tests to see what level it does trip at - if it fires OK at 35mA , it is less of an immediate  risk than if it still does not fire at 120mA.

    So assuming it does not pass close enough to 30mA that it could be tolerances on the test meter accuracy, then ..


    Report may have listed no failures against BS7671, if you had only done the minimum requred tests, but you tested more thoroughly

    and noted that the RCD protecting the bathroom is not operating as it should and needs replacement.


     


Reply
  • 0

    Effectiveness is deemed to have been verified where an RCD meeting the requirements of Regulation 415.1.1

    disconnects within 40 ms when tested at a current equal to or higher than five times its rated residual operating

    current.




    well, to only do a 5 times test meets the letter of the regs. which I think is not really an adequate standard for a case like this, especially considering what is being protected.

    However, additional testing above the bare minimum reveals that it is clearly not working right after all, and really needs changing soon. 

    In your shoes I might do a a few  more tests to see what level it does trip at - if it fires OK at 35mA , it is less of an immediate  risk than if it still does not fire at 120mA.

    So assuming it does not pass close enough to 30mA that it could be tolerances on the test meter accuracy, then ..


    Report may have listed no failures against BS7671, if you had only done the minimum requred tests, but you tested more thoroughly

    and noted that the RCD protecting the bathroom is not operating as it should and needs replacement.


     


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