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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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    AJJewsbury:

    Yet you've also stated (by giving a 'Satisfactory') that the installation is suitable for continued use in its current condition - which could well give the impression to the layman that improvements aren't really necessary after all.




    No, that would render C3 otiose.


    Zoomup's opinion is that it is safe for continued use - as opposed to being actually (C1) or potentially (C2) dangerous - but improvement is nonetheless recommended.

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  • 0

    AJJewsbury:

    Yet you've also stated (by giving a 'Satisfactory') that the installation is suitable for continued use in its current condition - which could well give the impression to the layman that improvements aren't really necessary after all.




    No, that would render C3 otiose.


    Zoomup's opinion is that it is safe for continued use - as opposed to being actually (C1) or potentially (C2) dangerous - but improvement is nonetheless recommended.

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