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Discuss First time in years could not find fault in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. chris day
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    chris day Regular EF Member

    Location:
    london
    Business Name:
    Chris peter
    split load DB

    Every circuit (7circuits) 1st half tripped RCCD

    And two circuits second side tripped The 1st RCCD whist the second RCCD supplying these circuits remained on??

    Swapped over the RCCDs to prove the units were not faulty.

    Removed every neutral to prove borrowed neutral not at fault still tripped.

    Any suggestions guys as I am the second sparky with a damaged ego on this one
     
  2. wirepuller
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    wirepuller Forum Mentor

    Location:
    south uk
    N-E fault somewhere. Did you IR test?
     
    • Agree Agree x 2
  3. SparkyChick
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    SparkyChick Making a banana smoothy for my fave gorilla Staff Member Moderator

    Location:
    South Wales
    Business Name:
    SparkyChick
    When you say you removed every neutral... did you take them out one at a time or all together?

    Could be you're chasing multiple faults
     
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    • Agree Agree x 1
  4. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    Are the incoming tails tight in the DNO head and / or meter - seen this on a number of occassions.

    And yes - it woud trip 1 or both RCD's ...

    Have you got a clamp meter - this may give you some pointers ...
     
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  5. lurch
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    lurch Electrician's Arms

    . . .. . agree with above. Dead tests first. IR tests.. then test between circuits . . .
     
  6. PEG
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    PEG Respected Member

    Location:
    Manchester
    Hi bud,not crabbing your methodology,but i would have isolated and tested the two RCD's independently,before guessing at not swapping two faulty units.

    No matter who,and how many,have has looked at this problem,you need to start right at the beginning,and use the known and trusted methods,one step at a time.

    These will not 100% guarantee a result,but it massively limits,what else can be happening.

    As for guessing what is going on,aside from what is obvious,a whole host of additional information would be required,up to including,a practical joking teenager,next door,with a home-made EMP device,made from a you-tube instructional.....don't ask...:)
     
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  7. dmxtothemax
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    dmxtothemax Regular EF Member

    Location:
    Australia
    Business Name:
    David Haddock Electronic Repairs
    I think Sparkychick hit the nail on the head !
    Multiple faults !
    This would explain why no one can find the problem.
    All the testing so far is based around the theory that there is one fault !
    When there could be several.
    Consider the possibility of several faults !
    don't forget to come back and tell us what it was ?
     
    • Agree Agree x 2
  8. chris day
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    chris day Regular EF Member

    Location:
    london
    Business Name:
    Chris peter
    Ok very embarrassed as client called another electrician round as I had been busy on an install.
    They unplugged the one thing I thought would be fine as it was brand new and fixed in.
    Bigger question how does one faulty washer dryer prevent the entires 1st split set of MCBs from switching on the RCCD.
    EGO has been hurt a little as some glory hogger stole the spot light, just like the Americans in WW2. Haha
     
  9. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    How can you do proper fault finding of a scoket circuit with items still plugged in? I don't think you can!

    I would say there is still a fault to be found ..............
     
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    • Disagree Disagree x 1
  10. ruston
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    ruston Respected Member

    Location:
    Northumberland
    Yes , like @SparkyChick@SparkyChick alluded to earlier.
    Probably cumlative leakage if one item cleared it .
    Or you may have been had by the solution.
     
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  11. chris day
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    chris day Regular EF Member

    Location:
    london
    Business Name:
    Chris peter
     
  12. wirepuller
    Offline

    wirepuller Forum Mentor

    Location:
    south uk
    I do. Every RCD tripping fault I come across I want every possible source of the fault left in place when I initially test. Only if L-N tests are being conducted would connected loads need to be isolated.
     
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  13. kingeri
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    kingeri Electrician's Arms

    Location:
    Yorkshire
    Before I started scratching my head I would have unplugged EVERYTHING!!
     
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  14. richy3333
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    richy3333 Forum Mentor

    Sounds like a 2 pipe riddle to me :)
     
  15. DPG
    Online

    DPG Respected Member

    Location:
    S Yorkshire
    Sounds rude to me
     
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