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Auxiliary supply within LV switchboards

Pyro

Auxiliary supplies within LV switchboards, to serve a power monitoring meter, for example, are commonly taken from the main busbars via DIN or Red Spot fuses. However, the installation between the main busbars and these fuses is in no way rated for the prospective fault current. Is this practice recognised/formalised in regulations or codes of practice, somewhere? Ta!

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    In general terms BS 7671 allows fault protection not to cover short lengths of conductors (<=3m long, installed in such a way to reduce the risk of faults to a minimum, and installed in such a way that the risk of fire or danger to persons is minimised should a fault occur) - see reg 434.2.1. Within a switchboard though - the specific equipment standard would outrank BS 7671 - though I suspect it will have similar provisions.

       - Andy.

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    In general terms BS 7671 allows fault protection not to cover short lengths of conductors (<=3m long, installed in such a way to reduce the risk of faults to a minimum, and installed in such a way that the risk of fire or danger to persons is minimised should a fault occur) - see reg 434.2.1. Within a switchboard though - the specific equipment standard would outrank BS 7671 - though I suspect it will have similar provisions.

       - Andy.

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