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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?

Parents
  • Legh Richardson: 
     

    Colin Haggett: 
     

    I know one thing, if there’s a couple of teenage girls in the house it will definitely trip. 

    Yes, I was called out to investigate a shower that had blown a 30A wylex fuse. The lady in question said that her niece had been enjoying the new water power spray for about ¾ of an hour when it stopped. It appeared the woman had had installed a new electric shower the day before.

    Legh

    BUT … is that a failure of DESIGN (in relation to the characteristics of the fixed appliance and the OCPD) or OVERLOAD PROTECTION?

    I really think it's NOT 433 …

    … BUT as I've said all along in this discussion thread, I don't think that's a reason to say it's OK and complies with BS 7671! 

Reply
  • Legh Richardson: 
     

    Colin Haggett: 
     

    I know one thing, if there’s a couple of teenage girls in the house it will definitely trip. 

    Yes, I was called out to investigate a shower that had blown a 30A wylex fuse. The lady in question said that her niece had been enjoying the new water power spray for about ¾ of an hour when it stopped. It appeared the woman had had installed a new electric shower the day before.

    Legh

    BUT … is that a failure of DESIGN (in relation to the characteristics of the fixed appliance and the OCPD) or OVERLOAD PROTECTION?

    I really think it's NOT 433 …

    … BUT as I've said all along in this discussion thread, I don't think that's a reason to say it's OK and complies with BS 7671! 

Children
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