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Shock Likelihood at Switch.

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 Alan Capon over 5 years ago

I would have to agree. Unless the switch was clearly marked as “Class II”, it would be a Code C2 and “unsatisfactory” or in the old way of doing things, “Fail”. The EICR needs to reflect the installation as you found it on the day, not how it may be after a while if the householder can be bothered swapping the shiny new metal switches for some less shiny plastic ones.

Regards,

Alan.
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0 Alan Capon over 5 years ago

I would have to agree. Unless the switch was clearly marked as “Class II”, it would be a Code C2 and “unsatisfactory” or in the old way of doing things, “Fail”. The EICR needs to reflect the installation as you found it on the day, not how it may be after a while if the householder can be bothered swapping the shiny new metal switches for some less shiny plastic ones.

Regards,

Alan.
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Shock Likelihood at Switch.

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