metal light switch case registering live - worried!

Discussion in 'Electrics UK' started by jamiller, 19 Jan 2008.

  1. jamiller

    jamiller

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    I have swapped a plastic single light switch for a chrome one. I connected the red, black and earth (box and switch). When I put a screwdriver tester on the chrome, it is registering as live (lights up inside handle). The case is not live to touch and the light wiorks fine. Can this be explained. Thanks
     
  2. Dippy

    Dippy

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    You need to check this out with something better than a screwdriver tester. You probably have a 'floating' cpc (aka earth).
     
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  4. jamiller

    jamiller

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    can you explain please - is it dangerous
     
  5. securespark

    securespark

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    If your cpc (earth) is not connected to earth at the other end, then yes. Your metal switch could, under fault conditions, become live to touch. B
    This is because there will be no connection to earth to take fault current away.
     
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  7. Taylortwocities

    Taylortwocities

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    SS is very right.

    I just wanted to understand your logic here.
    You used a neon screwdriver to test the switch plate and the indictor lit up.
    Suspecting that it could be live you thought the next best step would be to test it out by touching it with your finger?? [​IMG]
     
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