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Shock Likelihood at Switch.

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Mornin' All,


I have just inspected and tested a renovated  old flat's wiring. The original lighting wiring in places has no circuit protective conductor. The owner has installed metal plate light switches to two positions with wooden back boxes. At these two positions there is no circuit protective conductor. The flat has a new R.C.B.O. consumer unit and all other wiring is good.


I have recommended that the switches have a C.P.C. installed (difficult and disruptive) or be changed to all insulated types.


Just what is the shock risk at these two switch positions? What is the likelihood of the metal plates becoming live due to a fault? Has anyone every seen a metal plate switch break down so that the plates becomes live?


Thanks,


Z.

Parents
  • 0
    My OVERALL ASSESSMENT OF THE INSTALLATION in terms of its suitability for continued use is Satisfactory.


    "Satisfactory" according to my dictionary = acceptable but not outstanding or perfect.

    adjective
    1. fulfilling expectations or needs; acceptable, though not outstanding or perfect.

      "he didn't get a satisfactory answer"




    Two unearthed new metal plate light switches coded as C3. Improvement recommended.


    Why not C2? "Potentially dangerous-urgent remedial action required." I don't consider them to be immediately dangerous. I inspected behind them as to cable condition and switch condition. Anyway, everything is potentially dangerous.


    "Potential" = Having the capacity to develop into something in the future. The flat owner has been made aware of the non earthed switches and it is now up to him to deal with the C3 coded issue efficiently. He has been alerted. My job is done.


    Z.










Reply
  • 0
    My OVERALL ASSESSMENT OF THE INSTALLATION in terms of its suitability for continued use is Satisfactory.


    "Satisfactory" according to my dictionary = acceptable but not outstanding or perfect.

    adjective
    1. fulfilling expectations or needs; acceptable, though not outstanding or perfect.

      "he didn't get a satisfactory answer"




    Two unearthed new metal plate light switches coded as C3. Improvement recommended.


    Why not C2? "Potentially dangerous-urgent remedial action required." I don't consider them to be immediately dangerous. I inspected behind them as to cable condition and switch condition. Anyway, everything is potentially dangerous.


    "Potential" = Having the capacity to develop into something in the future. The flat owner has been made aware of the non earthed switches and it is now up to him to deal with the C3 coded issue efficiently. He has been alerted. My job is done.


    Z.










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