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Discuss Neutral-Earth fault? in the DIY Electrical Forum area at ElectrciansForums.co.uk.

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  1. Wolstej
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    Wolstej EF Member

    Location:
    Nantwich
    Can anyone help us with a problem? Since the summer one of our RCDs has been tripping every night at the same time (22:52 before the clocks went back, 21:52 ever since). There are two RCDs in the switch board: the one that trips has an outside workshop, upstairs sockets, downstairs lighting and the door bell. The house was completely rewired in 2012 so everything is (or was) bang up to date. At first we suspected the RCD so both were duly changed but to no effect. We also suspected the boiler which was quite old; today we had a brand new one fitted but still the RCD tripped. A 'neutral-Earth' fault has been mentioned a couple of times but what seems really strange is the regularity of the problem, the same time every single night. We cannot think of a single thing that comes on or goes off but surely it has to be something with timing circuitry, a standard fault wouldn't be so predictable. Could something on the other RCD be causing it? But if so, why doesn't that side trip as well?

    If anyone has any ideas we'd love to hear from you because we really are at ours wits' end now and do not know where to turn
     
  2. Pat H
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    Pat H Don't ask, get an Electrician in.

    Location:
    Ware Herts
    Business Name:
    Sparks of Intelligence
    I'd be tempted to turn off all but one of the circuits a few minutes before the trip happens. By a process of elimination you should be able to isolate the circuit that is causing the trip.
     
  3. Wilko
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    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Hi - sorry to hear you've a problem. It is intriguing that it trips at the same time ea night. A few qs ... the RCD having tripped and been reset, works ok for 24hrs? And everything in the house works as you think it should (i.e. no known faults) ? Also, do you / did you have storage heaters?
     
  4. Leesparkykent
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    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    There must be something that's timed to turn on or off at that time. your new boiler is it a combi or do you have a hot water cylinder?
     
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  5. Wolstej
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    Wolstej EF Member

    Location:
    Nantwich
    We haven't actually tried doing this at the circuit board, definitely worth a shot. Many thanks
     
  6. Wolstej
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    Wolstej EF Member

    Location:
    Nantwich
    That's right, we reset the RCD and it's absolutely fine until the next night. There are no other faults that we know of; we have a combi boiler and radiators
     
  7. Wolstej
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    Wolstej EF Member

    Location:
    Nantwich
    Hi. It's a Worcester Bosch combi boiler. We have nothing else on a timer. Thanks
     
  8. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Can you quickly check the on off time on the heating programmer ?
     
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  9. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    you will need a lot a detective work for this one, if you have not got any test gear the only way is start dropping the mcbs , before that time of fault to see which mcb has the fault .
    before the rcd trips why did you have the both rcd changed .
     
  10. Wolstej
    Offline

    Wolstej EF Member

    Location:
    Nantwich
    The new boiler and wireless thermostat were fitted literally today! At the moment it's on manual so we're just going to turn it on and off when we need to. We've had the log burner going tonight so the boiler's been off since 17:30. J
     
  11. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Perhaps leave it off till after the witching hour and one thing eliminated:)
    Has that time already passed?
     
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  12. Wolstej
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    Wolstej EF Member

    Location:
    Nantwich
    Thanks, we'll definitely try this but it'll take a few nights before we get a result! I agree, why DID we have the RCDs changed! It seemed worth a try at th time but you have to trust what someone suggests, at least to start with!
     
  13. Wolstej
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    Wolstej EF Member

    Location:
    Nantwich
    Will do. But would you agree it must have something to do with a timer? It's just too regular to be a random fault!
     
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  14. westward10
    Online

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    They normally trip with good reason and are generally replaced when they don't.
     
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  15. Wolstej
    Offline

    Wolstej EF Member

    Location:
    Nantwich
    I know, I should be grateful that they're keeping us safe but we can't go on like this forever!
     
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