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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?

Parents
  • 0

    It MIGHT be OK.

    More detail needed, in particular, what size fuse or circuit breaker is installed at the supply end ? Under favorable circumstances 6mm SWA MIGHT be acceptable for 63 amps, and is almost certainly acceptable if the load is short term or intermittent.

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  • 0

    It MIGHT be OK.

    More detail needed, in particular, what size fuse or circuit breaker is installed at the supply end ? Under favorable circumstances 6mm SWA MIGHT be acceptable for 63 amps, and is almost certainly acceptable if the load is short term or intermittent.

Children
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