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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.

Parents
  • 0
    I was asked to do a HMO EICR in a hurry, because the licence had expired. I failed the installation as unsatisfactory, one of the reasons was a lighting circuit failing an insulation test.


    Having replaced the consumer unit with a new one with RCBOs I identified a metal light fitting worth about fifteen quid that was responsible for the low insulation test result, so I replaced it with a plastic ceiling rose and pendant set.


    Every done, two certificates sent to the customer, the EICR and the EIC each with an invoice detailing the work carried out, including the explanation of why I had took the metal light fitting down and replaced it with a plastic one. I did not throw the metal light fitting away, I labelled it do not use and left it in the house for the customer to dispose of.


    The customer emailed me to say they had paid me and enquired if they could put the old metal light fitting back up now I had finished. Sometimes you just can’t make it up!


    Andy B.

Reply
  • 0
    I was asked to do a HMO EICR in a hurry, because the licence had expired. I failed the installation as unsatisfactory, one of the reasons was a lighting circuit failing an insulation test.


    Having replaced the consumer unit with a new one with RCBOs I identified a metal light fitting worth about fifteen quid that was responsible for the low insulation test result, so I replaced it with a plastic ceiling rose and pendant set.


    Every done, two certificates sent to the customer, the EICR and the EIC each with an invoice detailing the work carried out, including the explanation of why I had took the metal light fitting down and replaced it with a plastic one. I did not throw the metal light fitting away, I labelled it do not use and left it in the house for the customer to dispose of.


    The customer emailed me to say they had paid me and enquired if they could put the old metal light fitting back up now I had finished. Sometimes you just can’t make it up!


    Andy B.

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