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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.

Parents

  • John Peckham:

    "So Mr Z we have heard from the learned pathologist that the cause of death was electric shock caused by water from a wallpaper steamer dripping in to the light switch have we not? We have also heard from our expert witness Mr P he found that the metal light switch was un-earthed and the special shock protection device known as an RCD was not working. We also heard from Mr P that in his view your report showed the electrical installation was "satisfactory for continued service" as stated in the recognised electrical safety standard was not correct and in his expert view your report should have concluded that the installation was in fact in an un-satisfactory condition for continued service. Mr P also produced as part of his evidence documentary evidence a document from the acknowledge electrical safety body know as Electrical Safety First that clearly indicates that an un-earthed light switch to be potentially dangerous and further more the document says this type of dangerous defect should have lead to the outcome of the report as being un-satisfactory. You said in your evidence in chief that it was your opinion that the electric installation was in satisfactory condition, are you seriously telling this court that you know better than the expert witness and the Electrical Safety First? Or is the case that you took money from the landlord, who needed a satisfactory report, and getting payment for your services would have been more difficult so you gilded the lily to please him? 


    I sat in the well of a court in the Emma Shaw case where the electricians mate confessed when challenged about his entries on a test certificate said "I would not have done it if I had known" . 




    There has been no death. The wall will not be steam stripped of wall paper as it has recently been painted with new emulsion paint.


    Z.

Reply

  • John Peckham:

    "So Mr Z we have heard from the learned pathologist that the cause of death was electric shock caused by water from a wallpaper steamer dripping in to the light switch have we not? We have also heard from our expert witness Mr P he found that the metal light switch was un-earthed and the special shock protection device known as an RCD was not working. We also heard from Mr P that in his view your report showed the electrical installation was "satisfactory for continued service" as stated in the recognised electrical safety standard was not correct and in his expert view your report should have concluded that the installation was in fact in an un-satisfactory condition for continued service. Mr P also produced as part of his evidence documentary evidence a document from the acknowledge electrical safety body know as Electrical Safety First that clearly indicates that an un-earthed light switch to be potentially dangerous and further more the document says this type of dangerous defect should have lead to the outcome of the report as being un-satisfactory. You said in your evidence in chief that it was your opinion that the electric installation was in satisfactory condition, are you seriously telling this court that you know better than the expert witness and the Electrical Safety First? Or is the case that you took money from the landlord, who needed a satisfactory report, and getting payment for your services would have been more difficult so you gilded the lily to please him? 


    I sat in the well of a court in the Emma Shaw case where the electricians mate confessed when challenged about his entries on a test certificate said "I would not have done it if I had known" . 




    There has been no death. The wall will not be steam stripped of wall paper as it has recently been painted with new emulsion paint.


    Z.

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