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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
    The installation certificate should say that the lack of a CPC is a non-compliance, to quote the ESF Best practice guide I linked to above:
    10.9. On completion of the work a record of any non-compliances, including the lack of protective conductors on the lighting circuits, must made in the Comments on existing installation section of the electrical installation certificate issued to cover the work

    I just checked the ESF guidance on un-earthed Class 1 fittings and their guidance is C2 and an unstatisfactory report. 


    Aren't these two mutually incompatible?


    Regards


    BOD

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  • Former Community Member
    0 Former Community Member
    The installation certificate should say that the lack of a CPC is a non-compliance, to quote the ESF Best practice guide I linked to above:
    10.9. On completion of the work a record of any non-compliances, including the lack of protective conductors on the lighting circuits, must made in the Comments on existing installation section of the electrical installation certificate issued to cover the work

    I just checked the ESF guidance on un-earthed Class 1 fittings and their guidance is C2 and an unstatisfactory report. 


    Aren't these two mutually incompatible?


    Regards


    BOD

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