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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. Staff Member Moderator

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    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 Respected Member

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    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. Staff Member Moderator

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    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. Staff Member Moderator

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    Have you retried the sockets which are okay.
     
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  7. telectrix
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    telectrix Scouser and Proud of It Respected Member

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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. Staff Member Moderator

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    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 Respected Member

    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 Respected Member

    Location:
    cheshire/staffordshire
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    Telectrix
    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. Staff Member Moderator

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    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 Respected Member

    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. Staff Member Moderator

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    Location:
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    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.
     
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