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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?

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  • On that basis an installation that I condemned out of hand, and said a few rude words about when I found it, many years ago before folk started worrying about competent person schemes and so on, may also have been OK after all actually  !?!? 

    In that case the cable to the shower came straight into the main switch on the CU and had no fuse at all, just the DNO one.  This was a (back then) fairly standard Wylex board, with not enough ways to add a shower, so the shower cable shared the switch terminals with the meter tails.?

    Overload protection omitted, S/C fault covered by the DNO fuse. Compliant apart from no easy means of isolation. Maybe we do not need breakers at all for cookers and showers, and a straight link onto the bus bar would do ? Somehow though I think not really best practice.

    Mike.

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  • On that basis an installation that I condemned out of hand, and said a few rude words about when I found it, many years ago before folk started worrying about competent person schemes and so on, may also have been OK after all actually  !?!? 

    In that case the cable to the shower came straight into the main switch on the CU and had no fuse at all, just the DNO one.  This was a (back then) fairly standard Wylex board, with not enough ways to add a shower, so the shower cable shared the switch terminals with the meter tails.?

    Overload protection omitted, S/C fault covered by the DNO fuse. Compliant apart from no easy means of isolation. Maybe we do not need breakers at all for cookers and showers, and a straight link onto the bus bar would do ? Somehow though I think not really best practice.

    Mike.

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