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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
    John, what would I do? It wouldn't satisfy my grand-daughter test, so it would have to be replaced. ?


    Thank you for your thorough analysis, but what has changed since 17th+3?
    • 651.2 was 621.2 - essentially the same

    • 643.8 was 612.10 - the note is an addition, but read on!

    • 643.7.1 was 612.8.1 - again the note referring to Table 3A is new, but the table is not and it isn't obvious why the table was there previously

    • 415.1.1 used to refer to the max. operating time of 40 ms at 5 IΔn so in fact that is not new - it has simply been put elsewhere

    • the generic schedule of test results has changed from two columns for IΔn and 5 IΔn to one unspecified column


    Could it be that for additional protection, the max trip time at 5 IΔn is appropriate, but for ADS in a TT system, it is the max trip time at IΔn which is important?


    Incidentally, BS61008 specifies a max break time of 40 ms at up to 500 A.
Reply
  • 0
    John, what would I do? It wouldn't satisfy my grand-daughter test, so it would have to be replaced. ?


    Thank you for your thorough analysis, but what has changed since 17th+3?
    • 651.2 was 621.2 - essentially the same

    • 643.8 was 612.10 - the note is an addition, but read on!

    • 643.7.1 was 612.8.1 - again the note referring to Table 3A is new, but the table is not and it isn't obvious why the table was there previously

    • 415.1.1 used to refer to the max. operating time of 40 ms at 5 IΔn so in fact that is not new - it has simply been put elsewhere

    • the generic schedule of test results has changed from two columns for IΔn and 5 IΔn to one unspecified column


    Could it be that for additional protection, the max trip time at 5 IΔn is appropriate, but for ADS in a TT system, it is the max trip time at IΔn which is important?


    Incidentally, BS61008 specifies a max break time of 40 ms at up to 500 A.
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