Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 102 replies
  • Subscribers 31 subscribers
  • Views 7477 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

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.

Parents
  • 0

    Alan Capon:




    Zoomup:

    . . . I went out and bought a twin switch of the type installed in the flat out of curiosity. . . The switch has an earth terminal to the plate. . . 




    That tells me that the switch is not class 2 construction, and the manufacturer is expecting the terminal to be earthed. 


    Regards,


    Alan. 


     




    Could that earth terminal be purely to terminate a single CPC or to join two (or more) CPCs together? ie Similar to an earth terminal in a plastic patress box.


    Clive

Reply
  • 0

    Alan Capon:




    Zoomup:

    . . . I went out and bought a twin switch of the type installed in the flat out of curiosity. . . The switch has an earth terminal to the plate. . . 




    That tells me that the switch is not class 2 construction, and the manufacturer is expecting the terminal to be earthed. 


    Regards,


    Alan. 


     




    Could that earth terminal be purely to terminate a single CPC or to join two (or more) CPCs together? ie Similar to an earth terminal in a plastic patress box.


    Clive

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines