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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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  • 0

    Zoomup:

    . . . I went out and bought a twin switch of the type installed in the flat out of curiosity. . . The switch has an earth terminal to the plate. . . 




    That tells me that the switch is not class 2 construction, and the manufacturer is expecting the terminal to be earthed. 


    Regards,


    Alan. 

Reply
  • 0

    Zoomup:

    . . . I went out and bought a twin switch of the type installed in the flat out of curiosity. . . The switch has an earth terminal to the plate. . . 




    That tells me that the switch is not class 2 construction, and the manufacturer is expecting the terminal to be earthed. 


    Regards,


    Alan. 

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