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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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    davezawadi (David Stone): 
     

    I am also very unhappy with the idea presented here that MCBs can overheat due to “overload”. 

    MCBs can overheat running at their rated capacity and may need voids ways left on either side of them for ventilation to ensure they work as intended or a MCB with a higher rating may be required, as detailed in the Hager documents I posted earlier.

    If MCBs can overheat running at their full stated capacity it’s a foregone conclusion that they can overheat when overloaded.

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    davezawadi (David Stone): 
     

    I am also very unhappy with the idea presented here that MCBs can overheat due to “overload”. 

    MCBs can overheat running at their rated capacity and may need voids ways left on either side of them for ventilation to ensure they work as intended or a MCB with a higher rating may be required, as detailed in the Hager documents I posted earlier.

    If MCBs can overheat running at their full stated capacity it’s a foregone conclusion that they can overheat when overloaded.

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