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Can you overload a lighting circuit

My question is if you’ve got a lighting circuit and you ad addition loads to the circuit will this always trip the breaker if you add too much load on a circuit? 


thanks for your help guys
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  • If the total possible load on a circuit is insufficient to cause overload then you need not provide any overload protection.

    You must still provide both Short Circuit protection and Earth Fault protection.

    Both of these (and overload protection) may be provided by a fuse or MCB .

    An RCD may be used for Earth Fault protection, usually as a supplementary protection along with such fuse or MCB or on its own on a TT system (a system whose earthing relies on a rod/plate etc in the ground).

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  • If the total possible load on a circuit is insufficient to cause overload then you need not provide any overload protection.

    You must still provide both Short Circuit protection and Earth Fault protection.

    Both of these (and overload protection) may be provided by a fuse or MCB .

    An RCD may be used for Earth Fault protection, usually as a supplementary protection along with such fuse or MCB or on its own on a TT system (a system whose earthing relies on a rod/plate etc in the ground).

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