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Electric shower 9.5kw on 32A MCB and 6mil cable

Discussion in 'Electrics UK' started by arthur22, 17 Sep 2021.

  1. arthur22

    arthur22

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    I need to replace a knackered electric shower which is 9.5kw, 6mm wiring and on a 32A MCB.

    It's a Triton so I asked them for the nearest replacement model and they said my cable and breaker are only suitable for 7.5kw shower (although they also said I could put a 9.5kw on 6mil if "I had no other choice" but definitely not on a 32A breaker).

    Thing is, I've lived here near 11 years and shower has never tripped in that time. Would it really be unsafe to replace it with another 9.5kw model? Or should I get 8.5kw instead? And why haven't I ever burnt the house down?
     
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  3. flameport

    flameport

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    Triton are correct.
    9.5kW is approximately 40A, far more than the 32A MCB.
    7.5kW is the maximum for a 32A MCB.

    It won't trip immediately as it works on a strip of metal inside heating up which typically takes tens of minutes.
    However it's still overloading the MCB and may cause damage to it and surrounding devices.

    It may be possible to change the 32A MCB to a 40A, however that depends on several factors including how the cable is installed and how long it is.
     
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  4. arthur22

    arthur22

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    Thank you very much for your quick response, I will ask an electrician to assess the cable run in person as I really don't want to go down to a 7.5kw shower.
     
  5. winston1

    winston1

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    Houses don't burn down because you overload a circuit. A trip blows eventually.
     
  6. JohnW2

    JohnW2

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    For those who care about such things, is that 'correct technical terminology'?
     
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  8. AndyPRK

    AndyPRK

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    A trip goes in the fusebox :cautious: :LOL:
     
  9. JohnW2

    JohnW2

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    Maybe, but does it "blow"? :)

    Kind Regards, John
     
  10. Risteard

    Risteard

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    It operates.
     
  11. JohnW2

    JohnW2

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    Indeed it does, and for those who feel that technically correct terminology must always be used, I would say that that would be the 'correct' terminology (and, of course, in addition to 'operating' rather than 'blowing', "a trip" is certainly not the correct term to describe the device which operates, anyway!).
     
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