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Discuss Intermittent Rcd Tripping in the Electrical Wiring, Theories and Regulations area at ElectrciansForums.co.uk.

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  1. Shane1089
    Online

    Shane1089 Guest

    Hi guys, i attended a property on friday the tenant has stated the rcd is tripping at intervals of 45-60 mins, i separated the ring legs and upon testing i was getting a reading of 0.60Mohms between Line-cpc on one end of the cable with all loads disconnected, i have never come across this fault before and my question relates to the tripping characteristics of the rcd/mcb. is this a problem you guys have come across before and should the mcb be tripping out although i know the rcd is more sensitive? many thanks in advance.
     
  2. 44ALLAN
    Offline

    44ALLAN Guest

    Location:
    Newcastle
    So..........what was tripping?

    Mcb or Rcd?

    Or Rcbo?

    Give us a clue mate :)

    Rcd .......earth fault.

    Mcb .............short cct/overload/earth fault.
     
  3. Shane1089
    Online

    Shane1089 Guest

    sorry my bad, still new to this... it was the RCD mate
     
  4. SPARTYKUS
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    SPARTYKUS Electrician's Arms

    Location:
    Shropshire
    600,000 Ohms. Thats alot of Ohms!

    did you test the RCD as well. Just to be sure. Seems a bit high for an RCD to trip but who knows whats going on there.
     
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  5. Shane1089
    Online

    Shane1089 Guest

    Thanks for the feedback rcd was operating fine following a ramp test and testing at half 1x and 5x
     
  6. 44ALLAN
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    44ALLAN Guest

    Location:
    Newcastle
    Hi guys, i attended a property on friday the tenant has stated the rcd is tripping at intervals of 45-60 mins,

    think.........

    45-60 min intervals................mmmmmm

    Timeclock/pump with level switch/heating pump..............possibilities are endless but easy really when you think about it:)

    Well...........sometimes lol
     
  7. Shane1089
    Online

    Shane1089 Guest

    lol but are you saying the the <1Mohm reading between line to cpc has nothing to do with it? even when i attended i forgot to mention(my bad) the rcd got to a point where it was constantly tripping even with all loads plus boiler disconnected sorry if i sound like a complete novice
     
  8. 44ALLAN
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    44ALLAN Guest

    Location:
    Newcastle
    mmmm

    If you have an RCD tripping with everything disconnected on the outgoing terminals then..............well..........c'mon?
     
  9. Outspoken
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    Outspoken Regular EF Member

    Shane, snapped a picture of you going to work chap...

    [​IMG]
     
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  10. Shane1089
    Online

    Shane1089 Guest

    All jokes aside i understand the fact of mcbs tripping at under <1Mohm my original question was in regards to how the mcb could/should react with the rcd in line with this type of fault, although you may already have had your kicks for the night
     
  11. Shane1089
    Online

    Shane1089 Guest

    "i have never come across this fault before and my question relates to the tripping characteristics of the rcd/mcb. is this a problem you guys have come across before and should the mcb be tripping out although i know the rcd is more sensitive? many thanks in advance."
     
  12. 44ALLAN
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    44ALLAN Guest

    Location:
    Newcastle
    Shane..............there are many on here willing to help but your post doesn't make sense mate.
    You said Rcd was tripping.............that's an earth fault..........think about it!
     
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  13. Shane1089
    Online

    Shane1089 Guest

    I think i have drank too much, appreciate the feedback
     
    • Like Like x 1
  14. tony mc
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    tony mc Electrician's Arms

    Shane. The RCD is either detecting a earth fault or its faulty. As for you IR on the CPC to Line being 0.6 Meg that should not trip the RCD . 230/0.03=7666 Ohms which is a long way off 600000 Ohms . Are you sure that nothing else is connected and if so I would IMO exchange the RCD and locate the IR fault that you have !
     
  15. Shane1089
    Online

    Shane1089 Guest

    Thanks for the feedback Tony, I am visiting again tomorrow to try and reinstate the other half of the circuit, I will make sure I check for anything that I may have missed and recheck the rcds operation, many thanks.
     
    • Like Like x 1
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