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Protecting a sub circuit

John Boy

Hi All,

I have inherited a house with an annexe in the garden.

the annexe has a 63amp RCCB in a 6 way board with a B20 three B16 and one B6 and one spare.

the annexe is supplied by a 3 core SWA 6mm cable that runs about 40 meters. The cable runs surface mounted externally back to the meter which is external in a coveted alleyway. This cable goes back to a fused consumer unit and then via Henley blocks to the 100a meter.

I have added up all the appliances etc in the annexe and the total max wattage comes to about 10kw.

the cable size seems a bit small but changing it would not be easy. So my question is how do I protect the cable in this situation?

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  • 0
    John Boy said:
    So my question is how do I protect the cable in this situation?

    Simple answer - for protection from overload - the same as for any other circuit - make sure the rating of the overcurrent protective device that supplies it isn't greater than the rating of the cable (as installed). Other methods are also possible (such as taking into account the nature of the connected loads, or downstream protective devices).

       - Andy.

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  • 0
    John Boy said:
    So my question is how do I protect the cable in this situation?

    Simple answer - for protection from overload - the same as for any other circuit - make sure the rating of the overcurrent protective device that supplies it isn't greater than the rating of the cable (as installed). Other methods are also possible (such as taking into account the nature of the connected loads, or downstream protective devices).

       - Andy.

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