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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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  • 0

    Sparkingchip: 
     

    Chris Pearson: 
     

    Ignorance?

     

    That is where I’m heading, the 10 mm cable is okay, possibly over the top, but not an issue.

    It is the 32 amp circuit breaker I have an issue with.

     

     

    I agree. Even if the shower is rated 8.5 kW at 240 V, you still have to account for a load of 35.4 A. (If it's 8.5 kW at 230 V, that's 37 A.)

    It certainly is unlikely to meet the loading factor criteria for the CU.

Reply
  • 0

    Sparkingchip: 
     

    Chris Pearson: 
     

    Ignorance?

     

    That is where I’m heading, the 10 mm cable is okay, possibly over the top, but not an issue.

    It is the 32 amp circuit breaker I have an issue with.

     

     

    I agree. Even if the shower is rated 8.5 kW at 240 V, you still have to account for a load of 35.4 A. (If it's 8.5 kW at 230 V, that's 37 A.)

    It certainly is unlikely to meet the loading factor criteria for the CU.

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