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Shower circuit design.

Why would an electrician install a 10 mm twin and earth circuit protected by a B32 MCB for a 8.5 kW shower?

  • Because they had that size cable to hand.

    Because the cable needs de-rating for thermal insulation or grouping.

    To allow for future use of a large shower and larger MCB without the disruption of changing the cable.

  • not having any other reel on the van at the time. Or a very long or very well insulated route, or a failure to check the  KVA at 1st fix, and precautionary approach in always using the large stuff  and smallest breaker just in case. I agree 10mm will almost always be oversize - some houses and small flats seem to have meter tails of about that size.

    Mike.

  • And the B32 MCB for a 8.5 kW shower?

  • Ignorance?

  • 10mm2 sounds good to me - a bit of future proofing and even a pehaps a small saving in losses.  A B32 sounds like a bit of a cockup for a 35-37A load though.

       - Andy.

  • Unless the cable's running through an awful lot of thermal insulation….

  • Run in building voids though the floor then up the wall behind panels.

  • is it the original shower or an upgrade ?

  • Completely new circuit and shower.

  •  

    Method B.

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