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OCPD as current limiter

lyledunn

Whilst it is implicit in 433.1.1 and others, I am sure that I saw a regulation that specifically stated that an overcurrent protective device should not be used to limit the normal current in a circuit. If I was to guess, it might have been in 15th or 16th editions, which I have trawled through without success. 

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    I would sort of agree with Andy, that it's no longer directly included, because of the way overcurrent is now defined in BS 7671.

    Overcurrent. A current exceeding the rated value. For conductors the rated value is the current-carrying capacity.

    If you know an overcurrent (in its guise as an overload current, rather than a fault current) is going to occur in normal use, than you are exceeding the rated value of current for the protective device (In usually), which is against a 'fundamental principle' requirement of BS 7671 (133.2, 133.2.2) and in a workplace also possibly a breach of EAWR and PUWER.

  • 0 in reply to gkenyon

    Ah, do I assume, GK,  that you are aware of such a regulation having existed? I understand the requirement is superfluous, but I would love to know in what edition of the wiring regulations it was made. 

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  • 0 in reply to gkenyon

    Ah, do I assume, GK,  that you are aware of such a regulation having existed? I understand the requirement is superfluous, but I would love to know in what edition of the wiring regulations it was made. 

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