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How a simple job can go wrong quickly....

Former Community Member
Former Community Member
Not my work before I relate:


Existing 3-ph circuit breaker DB in a shop has a 30 mA 4 pole RCD belatedly fitted in a separate enclosure to provide blanket RCD protection. OK, not ideal.

Electrician asked to install extra 13 A socket-outlet in window during shop hours so padlocks off the circuit's circuit-breaker and proceeds, He lets the circuit neutral and cpc touch when fitting the socket-outlet and out trips the RCD as expected. Resets and shop keeper then announces that the card reader, till, air-con and some lights not working.


All that equipment now duff (technical term!).


For an interesting weekend quiz, what happened?


Without hindsight and the work being done during opening hours, what would you have done differently?


Regards


BOD






Parents
  • 0
    Here is an excellent video presentation showing how a broken neutral can cause a high Voltage on single phase loads derived from a three phase supply. It is Canadian so the Voltages are not U.K. standard Voltages. I did not understand how an A.C. Ammeter can be wired backwards or display in reverse though.


    Enjoy.....https://www.youtube.com/watch?v=d1imn9lbxOs


    Z.
Reply
  • 0
    Here is an excellent video presentation showing how a broken neutral can cause a high Voltage on single phase loads derived from a three phase supply. It is Canadian so the Voltages are not U.K. standard Voltages. I did not understand how an A.C. Ammeter can be wired backwards or display in reverse though.


    Enjoy.....https://www.youtube.com/watch?v=d1imn9lbxOs


    Z.
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