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Changed a light now sockets wont work

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    #32
    Risteard81
    Registered Users Posts: 2,567 ✭✭✭Risteard81


    Bruthal wrote: »
    If a neutral/earth fault at light fitting which is through rcd, it would normally clear when circuit affected is switched off, or has no load on.

    Not true. The Neutral/Earth fault will remain in situ and therefore will create an imbalance on other circuits connected to the same RCCB (or a similar problem if single pole RCBOs were used instead of RCBOs if say a Selective (time-delayed RCCB was used upstream) which switch the neutral - although single pole RCBOs are uncommon in the south of Ireland).


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    #33
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    Quote
    Risteard81 wrote: »
    Not true. The Neutral/Earth fault will remain in situ and therefore will create an imbalance on other circuits connected to the same RCCB (or a similar problem if single pole RCBOs were used instead of RCBOs if say a Selective (time-delayed RCCB was used upstream) which switch the neutral - although single pole RCBOs are uncommon in the south of Ireland).

    Lighting circuits in a house such as bathrooms, are usually on their own circuit.

    I said plenty of of times in this forum how circuits with neutral earth faults on one circuit can trip an RCD when a different circuit is loaded. Also it can happen from circuits not on the same RCD, usually needing a higher load to cause problems.

    But neutral earth faults are not always direct short circuits, so to say something is simply not true, is probably suggesting that no variables exist. But I would expect it possible for socket circuit A with an earth fault, to cause RCD trip from a load on socket circuit B. But its by no means certain like you say it is. Variables such as size of load on other circuit, and nature of neutral/earth fault make it far from certain. Bad wording on my part though in that post.

    Also, you say earth fault on 1 circuit creates imbalance in other circuits on the same RCD. Not really. The only circuit with imbalance between live and neutral will be the one with the fault.


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