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Discuss Ring main MCB tripping, nothing plugged in. in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Joep1234
    Offline

    Joep1234 New EF Member

    Location:
    Southampton
    Hello everyone,

    Bit of a confusing one. I have a ring main on a 32A mcb. The MCB keeps tripping, sometimes the circuit will stay on for around half an hour then suddenly trip. This is still tripping with nothing plugged in. I have checked all sockets and made sure all connections are tight inside and sockets or switched spurs. Im not sure how the ring was wired as the cables inside the DB are the old colours yet all the cables i have checked that i can gain access too are the new colours so i believe there is more into it. I was just wondering if anyone has had any experience of this before and if so what i should be looking for as im stumped? Is it a break in the cable? but why would it stay live for 30 mins then suddenly trip?
     
  2. telectrix
    Offline

    telectrix Scouser and Proud of It Forum Mentor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    need to test the circuit. esp.IR tests and a leakage clamp meter would come in handy. it could even be a faulty RCD or leakage on other circuits adding to any leakage on the ring circuit. doytou have access to test gear? if not, all you can try is to switch all other breakers off except the ring breaker, then see if it still trips. failing which call in an electrician.
     
    • Like Like x 2
  3. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    If you are 100% sure nothing is plugged in or connected via a spur unit, then I would guess you need to look at what ever doesn't work when the CB is Off.
    Is the OCPD an RCBO, or just a plain CB.
    Best advice get an electrician in to carry out some testing IR continuity etc.
     
    • Like Like x 1
  4. Pete E
    Offline

    Pete E DIY

    Location:
    N Wales
    Any recent work been done on the electrics?
     
    • Like Like x 1
  5. rolyberkin
    Offline

    rolyberkin Electrician's Arms

    Location:
    Chelmsford
    Have you got test equipment, if so what are your readings, if not you need an electrician as you could be looking for a needle in a haystack. Do you have an RCD as well as an mcb?
     
    • Like Like x 1
  6. Joep1234
    Offline

    Joep1234 New EF Member

    Location:
    Southampton
    The MCB is on a spit board. The main RCD does not trip, only the MCB. ive taken all the fuses out of the FCU as well.
     
  7. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    D
    definitely need some electrical testing done soonest, any water leaks recently, outside lighting tagged on the the Ring Final Circuit (RFC) ?
     
    • Like Like x 1
  8. Taylortwocities
    Offline

    Taylortwocities Electrician's Arms

    Location:
    Oxfordshire
    Have you checked other things like boiler/heating, cabling that goes outdoors, etc....
     
  9. Joep1234
    Offline

    Joep1234 New EF Member

    Location:
    Southampton
    there is an outside light on the circuit but when i switch the circuit on the light works no problem but after 30mins the circuit will trip. even when i take the fuse out of the FCU controlling the outside light it will trip with nothing visibly on the circuit.
     
  10. telectrix
    Offline

    telectrix Scouser and Proud of It Forum Mentor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    might just be a simple case of a tired MCB> for the sake of £3 ish, bung a new one in.
     
  11. Joep1234
    Offline

    Joep1234 New EF Member

    Location:
    Southampton
    Tried that, replaced the MCB with a new 32A mcb but still tripping.
     
  12. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Time to call an electrician with all the test gear.
     
    • Like Like x 1
    • Agree Agree x 1
    • Winner Winner x 1
  13. Andy78
    Offline

    Andy78 Forum Mentor

    Location:
    Kingston upon Hull
    You need to get an electrician in to break down the circuit and identify the fault through insulation testing.
     
  14. telectrix
    Offline

    telectrix Scouser and Proud of It Forum Mentor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    the change of cable colours rings an alarm bell with me.
     
    • Agree Agree x 2
  15. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    No amount of Google searching now will help you unless you next buy some test kit for about £400 and then learn how to use it

    Sorry if this isn't what you want to be told
     
    • Like Like x 2
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