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weird lighting fault

Discuss weird lighting fault in the Electrical Wiring, Theories and Electrical Regulations at Tilers Forum; 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 ...
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    Default weird lighting fault

    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

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    Default Re: weird lighting fault

    do a R2 test on the conduit end to end. then test to MET.
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    Electricians Arms Member Dean Williams's Avatar
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    Default Re: weird lighting fault

    from the board to the fitting is about 300 metres...

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    Default Re: weird lighting fault

    even if it's 3000m you've got to get it right, one way or another. do it in stages with a wander lead.
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    Default Re: weird lighting fault

    that will be fun, all the conduit is buried in walls and in ceilings to which there is no access. Thanks

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    Default Re: weird lighting fault

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

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    Default Re: weird lighting fault

    sounds like a break in the conduit to the fitting, just code 1 it, and recommend rcbo

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    Default Re: weird lighting fault

    code 1 it and FIX it. you don't put a band- aid on an arterial bleed.
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    Default Re: weird lighting fault

    thanks. the conduit is 35 years old!
    just dont understand why its 110v

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    Default Re: weird lighting fault

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

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    Default Re: weird lighting fault

    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.

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    Default Re: weird lighting fault

    floating earth?
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