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Discuss Electric Shock off a Light Switch in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Ali-C-123
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    Ali-C-123 Active EF Member

    Location:
    Manchester
    Hi. Wondered if anyone can offer some insight. Basically this isn’t my area of work in general so hence the post.

    I was asked today to oversee an investigation into a potential electric shock when someone switched a light on. The shock was described as a “massive” electric shock that supposedly blasted the victim against the adjacent door. Victim was ok afterwards with no lasting effects. Nobody seems to have seen the incident.

    The commercial spark ran his tests. Basically the light is a double gang plastic switch (think cheap) on a plastic surface mount box. Inside the earth cables are terminated together but not to the box as you would expect with it being plastic.

    There were no loose cable or damaged cables in the box. The guy testing ran an insulation resistance test from the light fitting with the switch in the ON position and found it to be fine. Zs measured at about 1.5ohms on a 6A MCB. RCD test tripping at 23ms at 1xI and at 7ms at 5xI. Similar results at 180. Ramp test showed RCD to trip at 24mA. Earth continuity belled back to dis board from every accessory and found to be fine.

    The spark didn’t have an explanation. Neither do I. Settled on replacing the switch itself. Anything we’ve missed? Any advice welcome.
     
  2. Andy78
    Online

    Andy78 Respected Member

    Location:
    Kingston upon Hull
    What material is the carpet made of ? ;)
     
    • Agree Agree x 3
  3. Ali-C-123
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    Ali-C-123 Active EF Member

    Location:
    Manchester
    It’s concrete. I can’t see it being static. Especially considering the box isn’t earthed with it being a surface mount plastic box.
     
  4. DPG
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    DPG Respected Member

    Location:
    S Yorkshire
    Difficult to see how such a massive shock could be obtained in those circumstances you describe. It's not somebody 'trYong it on' is it? Have they mentioned compensation ?
     
    • Agree Agree x 7
  5. SWD
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    SWD Gender neutral Electrician's Arms

    Location:
    London
    Did the person that received the electric shock justexti a swimming pool and was dripping with water?
     
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  6. Ali-C-123
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    Ali-C-123 Active EF Member

    Location:
    Manchester
    No the person was totally dry. It’s a strange one. No the person hasn’t mentioned combo but I am inclined to believe that the story may be a little fishy.
     
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  7. MFS Electrical
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    MFS Electrical Forum Mentor

    Location:
    Scotland, Inverclyde, Greenock
    Business Name:
    MFS Electrical
    Was the switch arcing and possibly frightened someone?
     
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  8. Ali-C-123
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    Ali-C-123 Active EF Member

    Location:
    Manchester
    I wondered that myself. The person is insisting that they received a shock. It’s always a little concerning when you don’t find anything wrong.
     
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  9. Ali-C-123
    Offline

    Ali-C-123 Active EF Member

    Location:
    Manchester
    I think I’ll just present my findings and leave it at that. Just wanted to be sure I hadn’t missed something in your opinions.
     
    • Like Like x 1
  10. ruston
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    ruston Respected Member

    Location:
    Northumberland
    Maybe has Cervical Spondylosis in the neck, lifting the arm can cause severe pain in the neck and tingling in the arm similar to a mild shock.
    If they have not had it before this can be quite alarming.
    Other than that I am with @DPG@DPG
     
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  11. Ali-C-123
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    Ali-C-123 Active EF Member

    Location:
    Manchester
    Thanks folks. Appreciate the input.
     
    • Like Like x 1
  12. essex
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    essex Forum Mentor

    Location:
    Wiltshire
    He is talking rubbish. Not sure how anyone can get a shock from plastic.
     
    • Agree Agree x 3
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  13. anthonybragg
    Online

    anthonybragg Electrician's Arms

    Location:
    NORTHAMPTON
    Business Name:
    CHARLTEC ELECTRICAL LTD
    What is the switch switching I know sometimes you can see the arcing in the small gap when making and opening the switch contacts?
     
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  14. SWD
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    SWD Gender neutral Electrician's Arms

    Location:
    London
    Replace the switch at least it looks like you have done a pre emptive fix.
     
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  15. Edtwozeronine
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    Edtwozeronine Regular EF Member

    Location:
    South Wales
    A friend of mine recently got a shock from the metal cassing of an old 12v transformer he was tinkering with. I'm quite surprised he's not dead! 0_o
     
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