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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
    As part of the risk assessment testing:


    10.5.4. An insulation resistance test should be applied between line and neutral connected together and the exposed-conductive-parts of every Class I lighting fitting and metal switch plate found to not be earthed by the continuity testing described in Section 10.5.2. The resistance should be at least 1 MΩ.

    Electrical Safety First. Best practice guide one.


     Andy B.


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  • 0
    As part of the risk assessment testing:


    10.5.4. An insulation resistance test should be applied between line and neutral connected together and the exposed-conductive-parts of every Class I lighting fitting and metal switch plate found to not be earthed by the continuity testing described in Section 10.5.2. The resistance should be at least 1 MΩ.

    Electrical Safety First. Best practice guide one.


     Andy B.


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