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Discuss Tripping times for a 100mA RCD? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. happyhippydad
    Offline

    happyhippydad Member Electrician's Arms

    Location:
    Gloucestershire
    Could anyone confirm if we test 100mA RCD's at x5?

    There is a lot of information on the web that says you only test at x1 but Table 3a in appendix 3 clearly shows a max disconnection time for a 100mA RCD at x5 to be 40ms.

    Thanks all.
     
  2. TJ Anderson
    Offline

    TJ Anderson Trusted Advisor

    Location:
    Derby
    5 x test is only for 30ma RCDs. That must be a mistake...
     
    • Agree Agree x 4
  3. Ian1981
    Offline

    Ian1981 Electrician's Arms

    Location:
    North east
    1x for a 100mA rcd.
    It offers no additional protection and only needs its disconnection time confirming for compliance with fault protection
     
    • Agree Agree x 3
    • Informative Informative x 1
  4. Andy78
    Offline

    Andy78 Trusted Advisor

    Location:
    Kingston upon Hull
    Table 3A shows the times for tripping required for compliance with the standards they are produced to.

    The requirements of BS7671 are not quite the same as the only requirement for a 5x test is for RCDs used for additional protection.
     
    • Agree Agree x 2
    • Informative Informative x 1
  5. Flanders
    Offline

    Flanders Regular EF Member

    Location:
    Tamworth
    What they all say I believe the 100ma will only prevent fire and does not protect life
     
  6. mhar
    Offline

    mhar Electrician's Arms

    Location:
    devon
    When I did the 2391 I was advised that the only thing you will lose marks for is for suggesting a 5x test on anything but a 30mA rcd
     
    • Informative Informative x 1
  7. 123
    Offline

    123 Electrician's Arms

    I'd assume a 10mA RCD would require 5x test as well?
     
    • Agree Agree x 3
  8. Dave OCD
    Offline

    Dave OCD Electrician's Arms

    Location:
    Cornwall
    Business Name:
    Hendry Electrical Services
    Good point,although I haven't seen a MFT with that function ?
     
  9. Andy78
    Offline

    Andy78 Trusted Advisor

    Location:
    Kingston upon Hull
    Really ? Have a look through the functions on yours, you might be surprised.
    Mine does 10, 30, 100, 300, 500, and 1000mA all at x0.5, x1, x2, and x5 and it's a very basic model.
     
  10. Dave OCD
    Offline

    Dave OCD Electrician's Arms

    Location:
    Cornwall
    Business Name:
    Hendry Electrical Services
    It might be that I've never taken notice of it Andy, can't be bothered to go out to the van in the current atrocious weather to check now though.:) The only time I ever installed a 10ma RCD was about 35 years ago when an apprentice, it was for a Hydrotherapy pool in a centre for disabled children and back then it was a massive lump, fixed to the wall with M12 Rawlbolts.
     
    • Like Like x 2
    • Funny Funny x 1
  11. spinlondon
    Offline

    spinlondon Trusted Advisor

    Location:
    Harlow Essex
    500mA is deemed too dangerous, so we do not test 100mA RCDs at 5x.
     
  12. Risteard
    Offline

    Risteard Electrician's Arms

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    Or less... e.g. 10mA RCDs. It's if it is providing additional protection.
     
    • Agree Agree x 2
    • Dumb Dumb x 1
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