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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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  • Former Community Member
    0 Former Community Member
    An RCD won't limit the current - the fault level would be the same with or without the RCD.


    It can only limit the time before disconnection based on a graduation of exactly what the fault current magnitude is.


    As the old skool used to mutter "it's the volts that jolt, it's the mills that kill"


    Regards


    OMS


Reply
  • Former Community Member
    0 Former Community Member
    An RCD won't limit the current - the fault level would be the same with or without the RCD.


    It can only limit the time before disconnection based on a graduation of exactly what the fault current magnitude is.


    As the old skool used to mutter "it's the volts that jolt, it's the mills that kill"


    Regards


    OMS


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