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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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    Surely the OCPD In most socket outlet circuits is in practice used to limit the current. Nothing prevents the user from using excessive numbers of high loading appliances and tripping the OCPD.

    In practice the limit on load, is "whatever we can get away with without tripping the breaker too often"

  • 0 in reply to broadgage

    Surely the OCPD In most socket outlet circuits is in practice used to limit the current.

    I'd say, not entirely. The circuit should be sized to suit the anticipated load - e.g. based on floor are and use of the premises, which tends to provide some de-facto limits - e.g. most people wouldn't exceed a 7.4kW load in 100m² home for very long - the place would get too warm and the cost of the electricity would be prohibitive.

       - Andy.

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  • 0 in reply to broadgage

    Surely the OCPD In most socket outlet circuits is in practice used to limit the current.

    I'd say, not entirely. The circuit should be sized to suit the anticipated load - e.g. based on floor are and use of the premises, which tends to provide some de-facto limits - e.g. most people wouldn't exceed a 7.4kW load in 100m² home for very long - the place would get too warm and the cost of the electricity would be prohibitive.

       - Andy.

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