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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.

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    Has anyone every seen a metal plate switch break down so that the plates becomes live?



    Usually the switch mechanism itself will offer protection via double/reinforced insulation (as people touch the rocker/dolly directly) - I think the risk is more due to a faults in wiring insulation behind the plate - either directly or via the steel backbox (if present).


       - Andy.
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  • 0

    Has anyone every seen a metal plate switch break down so that the plates becomes live?



    Usually the switch mechanism itself will offer protection via double/reinforced insulation (as people touch the rocker/dolly directly) - I think the risk is more due to a faults in wiring insulation behind the plate - either directly or via the steel backbox (if present).


       - Andy.
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