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Shock Likelihood at Switch.

Zoomup
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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  • 0

    Sparkingchip:




    Zoomup:

    Wander lead and a loop tester located the two unearthed metal light switches. Insulation tests carried out at consumer unit all good.


    Z.




    Insulation test between the lives and the metal plates of the switches?


    Andy B.


     




    The customer fitted metal plate switches are brand new and nobody is getting shocks from them. I have recommended that they be earthed or changed for all insulated ones. I am not going to endorse them by testing them.


    Z.


     

Reply
  • 0

    Sparkingchip:




    Zoomup:

    Wander lead and a loop tester located the two unearthed metal light switches. Insulation tests carried out at consumer unit all good.


    Z.




    Insulation test between the lives and the metal plates of the switches?


    Andy B.


     




    The customer fitted metal plate switches are brand new and nobody is getting shocks from them. I have recommended that they be earthed or changed for all insulated ones. I am not going to endorse them by testing them.


    Z.


     

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