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Discuss Shower 8.5 on a 40mcb is it dangerous in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. chrismoy1
    Offline

    chrismoy1 EF Member

    Location:
    wales
    Hi guys

    My tenant just had an electrician in to connect her cooker and has told her that the shower is dangerous and not to use it because it has a 40 mcb in the consumer unit and it should be a 32.
    The cable is 6mm and the shower is 8.5kw.

    Can you advise me please
    Thank you in anticipation
     
  2. anthonybragg
    Offline

    anthonybragg Electrician's Arms

    Location:
    NORTHAMPTON
    Business Name:
    CHARLTEC ELECTRICAL LTD
    Is the shower protected by an RCD and is the cable under insulation would have a factor on the answer.
     
    • Dumb Dumb x 1
  3. davesparks
    Offline

    davesparks Forum Mentor

    Location:
    guildford
    Ask for this to be put in writing by the electrician, explain that you need them to specify the exact regulation numbers which they are referring to and ask them to explain exactly how it is dangerous.

    It 8s possible that the installation may not comply with the current regulations, but it may not necessarily be dangerous.
     
    • Like Like x 4
  4. littlespark
    Offline

    littlespark Electrician's Arms

    Location:
    Scottish Borders
    The electrician was there to connect the cooker. He didn't have to mention anything about the shower circuit.
     
    • Funny Funny x 1
  5. Mike177
    Offline

    Mike177 EF Member

    Location:
    IG6 2tg
    Sure that 6mm can only take more than 40A if clipped direct.
    So a 32A would be a sensible option surely? 8.5kw is about 35/36 amps.
    So smaller shower or bigger cable.
    Or is my memory and maths failing me as much as my Fantasy football team?
     
  6. buzzlightyear
    Offline

    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
    star command
    ask you tenant to ask the say sparky to work out the loading ,any way what is the shower to do with the cooker ,or is any water coming out of the cooker .;)
     
    • Funny Funny x 1
  7. chrismoy1
    Offline

    chrismoy1 EF Member

    Location:
    wales
    Hi Anthony
    The cable is clipped direct and is not surrounded by or under any insulation.

    Regards Chris
     
  8. chrismoy1
    Offline

    chrismoy1 EF Member

    Location:
    wales
    RCD in the consumer unit.
    Regards Chris
     
  9. chrismoy1
    Offline

    chrismoy1 EF Member

    Location:
    wales
    Hi Mike
    I thought an 8.5 would draw a current of 35.5A so you would need an mcb higher than that and the next one up is 40.
    Regards Chris
     
    • Agree Agree x 6
  10. Dave OCD
    Offline

    Dave OCD Forum Mentor

    Location:
    Cornwall
    Business Name:
    Hendry Electrical Services
    Chris, this is the correct sized MCB for a 8.5kW shower, a 32amp device would be running at a slight overcurrent and although it would take a long time to trip it's not permitted in the regulations. I can't stand people who find fault with work unrelated to what they're doing - especially when they're spouting BS. :)
     
    • Agree Agree x 14
    • Like Like x 2
  11. chrismoy1
    Offline

    chrismoy1 EF Member

    Location:
    wales
    Thank you very much Dave for a very clear decision on this question.

    Regards Chris
     
    • Like Like x 3
  12. Paignton pete
    Offline

    Paignton pete Regular EF Member

    Location:
    Over the rainbow
    Dont think I agree there, if I saw a potentially dangerous situation I would point it out.

    Saying that this is not a good example of that, as it's not a potentially dangerous situation.
     
    • Agree Agree x 9
    • Like Like x 3
  13. chrismoy1
    Offline

    chrismoy1 EF Member

    Location:
    wales
    So you are sure it is not dangerous because I think my tenant will still want it changed to a 32 because an electrician has told it is dangerous and must not use the shower.

    Regards Chris
     
  14. GeorgeCooke
    Offline

    GeorgeCooke Regular EF Member

    Location:
    UK
    It is NOT dangerous, it is correct.

    What would be dangerous is putting in a 32a MCB as it could overheat.
     
    • Like Like x 3
    • Agree Agree x 3
    • Disagree Disagree x 2
  15. buzzlightyear
    Offline

    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
    star command
    ● 7kW - 32amp
    ● 7.5kW - 32amp
    ● 8kW - 40amp
    ● 8.5kW - 40amp
    ● 9.5kW - 45amp
    ● 10.5kW - 50amp
    This will help the op.
     
    • Like Like x 7
    • Dislike Dislike x 1
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