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Discuss Shower Installation 8kw to 8.5kw in the Electrical Wiring, Theories and Regulations area at ElectrciansForums.co.uk.

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  1. Mikedry
    Offline

    Mikedry EF Member

    Location:
    Arbroath
    Hi

    I have an 8.5kw shower which I wish to replace an 8kw shower with.
    I'm not sure which thickness cable I already have but I think its 6mm. Will this be ok for the 8.5kw shower? I attach a pic of the current 8kw shower with cables

    20180522_213748.jpg
     
  2. Baker1988
    Offline

    Baker1988 Electrician's Arms

    Location:
    Kingston Upon Hull
    Whats the installation method? Is it in insulation or any thing like that? What size mcb/rcbo is it on in your consumer unit?
     
  3. Gavin John Hyde
    Offline

    Gavin John Hyde Electrician's Arms

    Location:
    Somerset
    Business Name:
    Sulis Electrical Services Ltd
    couple of points...
    How is the cable installed... surrounded by insulation etc...
    How long is the cable run?
    Does the circuit have rcd protection back at the board?

    Also im not fully 100% on the rules in scotland... but does the part p special locations apply up in scotland? if so you might need to get a suitable electrician in to do the actual connections and test it.
     
  4. Mikedry
    Offline

    Mikedry EF Member

    Location:
    Arbroath
    Cable goes into roof so could be under insulation. Will have to check tomorrow. Not sure how to tell the size of the MCB? Sorry a bit of an amateur!
     
  5. Mikedry
    Offline

    Mikedry EF Member

    Location:
    Arbroath
    Run is about 8 metres
     
  6. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    Most shower installation instructions ask for rcd protection on the circuit. Does your fuse board have rcds ?
     
  7. Mikedry
    Offline

    Mikedry EF Member

    Location:
    Arbroath
    Yes it does. Just not sure what the rating of the shower one is. A new board was put in about 5 years ago and I'm assuming all was ok for the 8kw shower we already have.
     
  8. Baker1988
    Offline

    Baker1988 Electrician's Arms

    Location:
    Kingston Upon Hull
    It will more than likely be a 32A mcb but im not sure is there not any markings or labels on your consumer unit saying shower as the ine above it will say the size on it, and if the cable is covered by insulation then i would say it is defiantly not sutable for a bigger size shower, i wouldnt even put the shower you have on a 6mm cable that is covered in insulation.
     
  9. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Hi - just a friendly reminder that those cables may be live and be a hazard to you. Even if you have turned off the circuit breaker it may not be wired right and so still be live. I always recheck with an approved 2 pole voltage tester to ensure its dead and not me :) . The cable should have its size written on it, as anything else is a guess from a pic.
     
  10. Mikedry
    Offline

    Mikedry EF Member

    Location:
    Arbroath
    Pic attached of board. Blue RCD says 63amp on it but nothing on the actual shower switch to give an indication of rating

    20180524_230449_resized.jpg
     
  11. Baker1988
    Offline

    Baker1988 Electrician's Arms

    Location:
    Kingston Upon Hull
    It says on the mcb B40 so it is a 40A mcb and if it is actually 6mm and not 10mm then i hope it is not in insulation and is actually in free air or clipped direct as its called as any method other than clipped direct the current carrying capacity is to low for the MCB and too high for a 8.5kw shower, does it say on the cable the actual size, but please be carefull and dont poke around to much as it may give you a shock turn it off at the isolator first if you have not already
     
  12. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    If you make this change, how do you plan to test it?
     
    • Agree Agree x 1
  13. Mikedry
    Offline

    Mikedry EF Member

    Location:
    Arbroath
    Think I'll have to get someone in as I'm a bit lost with all this. It doesn't say a cable size on it. I had hoped it may be an easy swap but I better get it checked and tested properly
     
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  14. Gavin John Hyde
    Offline

    Gavin John Hyde Electrician's Arms

    Location:
    Somerset
    Business Name:
    Sulis Electrical Services Ltd
    To be fair to the op he sounds quite reasonable and took time to reply and listen. And hopefully a local spark will help him out.
    Hence the replies were good. If all the people coming on asking for advice were like him life on here would be dandy... sadly we get too many diyers wanting to save a few quid getting funny when told something they dont like.
     
    • Like Like x 4
  15. MDJ
    Offline

    MDJ Trusted Advisor

    Location:
    Gloucester
    Personally from the info supplied I think it will be fine, 8 mtrs of cable and it is 6mm2, can't see a problem with it handling 8.5 KW, now the 40 amp MCB? well it is there to protect the cable, can the 6mm2 cable cope with 40 amps? something for you new sparks to work out, we cannot tell you everything o_O
     
    • Like Like x 1
    • Agree Agree x 1
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