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Discuss >50v on megger when doing ELI test in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Sb8389
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    Sb8389 Regular EF Member

    Location:
    Nottingham
    Hi guys
    I have had an issue with a couple of sockets in a property when carrying out ELI tests on them saying greater than 50v and won't let me test, some sockets are ok on the same circuit just a couple saying this anybody come across this and understand what it means,I'm using a megger and the system is TNCS
     
  2. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Have you checked the sockets internal connections sounds like loss of earth continuity.
     
  3. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
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    loss of earth should bring up the N-PE indicator on a megger. @OP are you sure the MFT indicated > 50V and not < 50V.
     
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  4. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Not used one of these testers but often a 50v warning indicates a continuity problem.
     
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  5. Sb8389
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    Sb8389 Regular EF Member

    Location:
    Nottingham
    Yea greater which is confusing I have done two probe test with no issue at all only happens with 3 lead test
     
  6. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Have you retried the sockets which are okay.
     
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  7. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    sounds weird to me. when performing EFLI test, you should have > 50V, should be 240V. unless it's saying >50V N-E, which could indicate an earth fault.
     
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  8. Specialist
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    Specialist Electrician's Arms

    Location:
    South Wales
    Think that's what he's saying tel, greater than 50v on the Earth.
     
  9. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Have you physically checked to the socket terminals to verify continuity and polarity, if this is okay the socket could have internal corrosion so swap it and retry.
     
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  10. ruston
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    ruston Trusted Advisor

    Location:
    Northumberland
    On my old Megger seperate it means phase neutral reversed or no earth connection .Also excessive voltage between N+E.
    I suppose megger have kept the same convention
     
  11. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    the megger mft's have 3 voltage indicators. L-N, L-E and N-E. the first 2 light in normal circumstances, the 3rd only if there is a finite voltage seen N-E and the tester refuses to test.
     
  12. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Excessive voltage between N/E generally means no earth.
     
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  13. Sb8389
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    Sb8389 Regular EF Member

    Location:
    Nottingham
    Just retested the sockets and all testing ok only since I found a neutral to earth fault on the leg back to mains and disconnected it not sure how this would affect the issue I have had
     
  14. ruston
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    ruston Trusted Advisor

    Location:
    Northumberland
    @westward10@westward10 It does on mine , along with the others.
     
  15. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Have you totally isolated the faulty part or just disconnected from the board because if it is the latter the fault would still be there on a ring final.
     
  16. onions1066
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    onions1066 Electrician's Arms

    Location:
    Nottingham
    Didn't you find this fault when you were dead testing though?
     
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  17. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Don't see how a N/E fault would cause this problem.
     
  18. onions1066
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    onions1066 Electrician's Arms

    Location:
    Nottingham
    I will vouch though the megger can be a temperamental beast. We purchased 30 of them and had no end of problems. They replaced them all in the end and we ended up buying 30 of the flukes as well because all the sparks were moaning about the megger.
     
  19. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    unless there's a poor N or E connection on the supply side or at origin. i recently had a simar fault which was caused by a loose terminal in the head, on the link connecting the N block to the E block.
     
  20. bigspark17
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    bigspark17 Electrician's Arms

    Location:
    wales
    Yes this is voltage on the cpc causing the megger to bot start the test.. was there no rcd on the circuit in question?
     
  21. Ian1981
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    Ian1981 Electrician's Arms

    Location:
    North east
    I've got a megger mft 1552 and if the above 50v touch voltage appears meaning the voltage to earth is above 50 it will abort the test as it has an inbuilt safety setting whether it be efli or rcd testing
     
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  22. Sb8389
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    Sb8389 Regular EF Member

    Location:
    Nottingham
    No RCD on the circuit no was a basic socket replacement and went to do a ELI and found this issue so thought i would investigate further and IR tested the circuit and found the N-E fault,it just seemed weird when i tested with the faulty cable isolated the fault cleared. Like you say it may be my meggar it just threw me as never had this issue before.
     
  23. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Have you cleared the fault and retested. I am confused with this because a fault on one side of a ring final should also occur on the other.
     
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