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Shower circuit design.

Sparkingchip

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

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    You cannot have it both ways. 

    You're saying that if you don't need overload protection the MCB does not have to have a higher rating than the design current. 

    But the 2.5 mm circuit supplying both an electric hob and an oven does need overload protection, therefore the rating of the MCB has to be higher than the design current, so the B16 is a clear breach of the regulations, despite the MCB being rated for the cable. 

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    You cannot have it both ways. 

    You're saying that if you don't need overload protection the MCB does not have to have a higher rating than the design current. 

    But the 2.5 mm circuit supplying both an electric hob and an oven does need overload protection, therefore the rating of the MCB has to be higher than the design current, so the B16 is a clear breach of the regulations, despite the MCB being rated for the cable. 

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