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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
    I imagine that a simple risk analysis would result in a medium risk profile based on a low likelihood but a potentially high severity.  The latter would depend on many other things such as the combined floor and body resistance, area of contact and proximity of other earthy items. I wouldn’t argue with a risk assessment that concluded the risk to be tolerable but that is merely academic as it would be expected that relevant guidance was followed to ensure that basic control measures were present in the first place.
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  • 0
    I imagine that a simple risk analysis would result in a medium risk profile based on a low likelihood but a potentially high severity.  The latter would depend on many other things such as the combined floor and body resistance, area of contact and proximity of other earthy items. I wouldn’t argue with a risk assessment that concluded the risk to be tolerable but that is merely academic as it would be expected that relevant guidance was followed to ensure that basic control measures were present in the first place.
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