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Discuss Static shock from light switches even with power off?? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. coxyboy
    Offline

    coxyboy Active EF Member

    I was called out to a job today and found something I have never come across before....
    when I got to the property the tenant explained what was happening - she was getting what she called a "shock" when ever she turned the lights on upstairs in the two bedrooms and the landing. So I tested to see if there was any voltage at each switch and there wasn't. But sure thing as soon as I touched the switch I got a shock. I would say it was more of a big static shock than a normal voltage shock. So I had a little play around to investigate.

    ie removing each switch reterminating and making sure the earths were connected. But still no joy. I turned off the main switch so there was no power to any circuit but I was still getting the static from each switch in both bedrooms and on the landing.

    Has any one ever come across this problem before? If so what did you do to solve the problem??

    Any help would be much appreciated, thanks
     
  2. Sintra
    Online

    Sintra The Innkeeper Staff Member Admin

    Location:
    Belfast/London
    Saw this in a house that had a cheap nylon type carpet and once this was changed no more static shocks.
     
    • Like Like x 1
  3. KAS1
    Offline

    KAS1 Electrician's Arms

    Location:
    King's Lynn
    Nylon carpets lol
     
  4. dan86
    Offline

    dan86 DIY

    Location:
    Scotland
    ....+1
     
  5. Mork
    Offline

    Mork Regular EF Member

    Location:
    Kernow
    Do a Zs test at the affected switches, you may be floating.
     
  6. TaffyDuck
    Offline

    TaffyDuck Electrician's Arms

    Ditto.

    Cheapo carpets. Disconnect the cpc and you`ll see it wont happen, assuming there is no path to earth elsewhere. Changing the switches to plastic ones or if they already are, putting plastic screw covers over the set pins will solve it. Cheaper than new carpets. May still happen on ovens etc though.
     
  7. plugsandsparks
    Offline

    plugsandsparks Electrician's Arms

    Location:
    Chesterfield
    If you add underfloor heating to the mix, those pesky metal lights switches become lethal from static. Static likes dry atmosphere and its coming from the carpets. They might find its better in summer when the humidity rises.
     
  8. oldtimer
    Offline

    oldtimer Electrician's Arms

    Location:
    Edinburgh
    Yep change switches to the ones that have plastic covers on the screw because the tenant is earthing themselves another thing is tell the customer to run the back of her hand on the wall or staircase either that ditch the cheap nylon carpet
     
  9. Happyneiller
    Offline

    Happyneiller Guest

    Agreed - static
     
  10. markc123
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    markc123 Forum Mentor

    Location:
    Yorkshire.
    Go round tomorrow and rip the carpet up whilst acting like an Ape.
     
    • Like Like x 5
  11. markc123
    Offline

    markc123 Forum Mentor

    Location:
    Yorkshire.
    If she says 'what the F' tell her its for the greater good
     
    • Like Like x 1
  12. lushers
    Offline

    lushers Guest

    I had this very same thing today but the only difference was each it was various light fittings on the circuit; it would either be on the fixing screws or the terminals themselves, either through my hand or i would get a small spark through my voltage testers. The other difference was that unlike nylon carpets it was mostly laminate flooring. Help......
     
  13. Marvo
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    Marvo Admin and gender confused Staff Member Admin

    Location:
    South Africa
    Can you give a better explanation? What terminals and what voltage testers?
     
  14. lushers
    Offline

    lushers Guest

    I was just using my combi check testers to check for voltage, it would happen at whichever terminal I put my first probe on. having looked at other threads similar to this I think it might be a build up of static from the laminate flooring.
     
  15. Marvo
    Offline

    Marvo Admin and gender confused Staff Member Admin

    Location:
    South Africa
    I'm not buying the 'static from laminate flooring' theory to be honest. I'd test to a wander lead connected to the MET. Maybe do a Ze test first as well.
     
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