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  1. Dean Williams
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    Dean Williams Electrician's Arms

    Hi folks
    while testing this theatre, i attempted to get a Zs from an emergency exit sign. The steel conduit is being used as cpc.
    when i connect my three probes to l,n,earth i'm getting 110v on the screen and when i press test it comes up with about 160 ohms.
    i put a voltmeter across and found 110v between L and E but 230v between L and N.
    could this be a poor connection on the steel conduit cpc and if so, why does the voltage drop to approx 110v

    thanks...its a bit of a puzzle
     
  2. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    cheshire/staffordshire
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    Telectrix
    do a R2 test on the conduit end to end. then test to MET.
     
  3. Dean Williams
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    Dean Williams Electrician's Arms

    from the board to the fitting is about 300 metres...
     
  4. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    even if it's 3000m you've got to get it right, one way or another. do it in stages with a wander lead.
     
  5. Dean Williams
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    Dean Williams Electrician's Arms

    that will be fun, all the conduit is buried in walls and in ceilings to which there is no access. Thanks
     
  6. Dean Williams
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    Dean Williams Electrician's Arms

    assuming it is a bad earth, can someone please explain the science behind it...how does it become 110v???
     
  7. Guest 004
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    Guest 004 Guest

    sounds like a break in the conduit to the fitting, just code 1 it, and recommend rcbo
     
  8. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    code 1 it and FIX it. you don't put a band- aid on an arterial bleed.
     
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  9. Dean Williams
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    Dean Williams Electrician's Arms

    thanks. the conduit is 35 years old!
    just dont understand why its 110v
     
  10. Dean Williams
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    Dean Williams Electrician's Arms

    i will....i just want to get my head round the reason as to why the voltage drops to 110v
     
  11. Guest 004
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    Guest 004 Guest

    probably getting a reading through the damp walls, and forgot to mention, you should not walk away from a code 1, without isolating or rectifying.
     
  12. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    floating earth?
     
  13. Dean Williams
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    Dean Williams Electrician's Arms

    i'd be there forever and a day if i rectified all 76 code 1s that ive found so far!!!
     
  14. Guest 004
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    Guest 004 Guest

    There should be an agreement of what to do, as you find the code 1's
     
  15. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    only 76, must have been done on a good day.
     
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