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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
    If the neutral had broken first, the lines would not have been far behind. Would the duration have been long enough to have done the damage?


    There must be plenty of 4-pole switches out there (RCD or otherwise) which could present exactly the same risk, but I doubt that this sort of occurrence is commonplace. Moreover, wouldn't this have happened previously during quarterly, now six-monthly exercising of the test button? ?
Reply
  • 0
    If the neutral had broken first, the lines would not have been far behind. Would the duration have been long enough to have done the damage?


    There must be plenty of 4-pole switches out there (RCD or otherwise) which could present exactly the same risk, but I doubt that this sort of occurrence is commonplace. Moreover, wouldn't this have happened previously during quarterly, now six-monthly exercising of the test button? ?
Children
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