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Discuss 3Ø 100amp Question in the Commercial Electrical Talk area at ElectrciansForums.co.uk.

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  1. Rahul Patel
    Offline

    Rahul Patel New EF Member

    Location:
    Derby
    Business Name:
    Eldom Properties
    Hi

    I am planning to convert an old office building with 3Ø 100amp supply into 14 self contained student studios (approximately 20 sqm)

    Each studio will only have 2 electric heaters, 2 lights, 10 double sockets. The hot water will be gas heated.

    I'm hoping someone will be able to tell me if the current 3 phase, 100amp supply be enough to power 14 units?

    Your help is much appreciated

    Thanks
     
  2. Matthewd29
    Offline

    Matthewd29 Regular EF Member

    Location:
    Belfast
    Consult with the electrician designing and carrying out the work and they should be able to advise better as we don't have enough detail
     
    • Agree Agree x 4
    • Optimistic Optimistic x 1
  3. Adam W
    Offline

    Adam W Regular EF Member

    Location:
    Bournemouth
    I reckon it should be.
     
  4. Andy78
    Online

    Andy78 Forum Mentor

    Location:
    Kingston upon Hull
    Possibly, probably not. Electric hobs for example would make this a definitely not.
    You need to employ the services of an electrical designer to calculate you a maximum demand figure to present to the DNO, then they will tell you what is possible and for how much.
    You might get lucky and the current cable may be capable of supporting 160A fuses, you may get unlucky and have to pay for a larger supply cable.
     
    • Optimistic Optimistic x 1
  5. Paignton pete
    Offline

    Paignton pete Regular EF Member

    Location:
    Over the rainbow
    There are some complex calculations required for this.
    I agree. Hire a electrical instalation design contractor who will then be liable.

    Don't accept our responses as confirmation or not.
     
  6. buzzlightyear
    Online

    buzzlightyear still kicking sand, before pushing up daisies . Electrician's Arms

    Location:
    star command
    so whats your loading ?;)
     
    • Winner Winner x 1
    • Optimistic Optimistic x 1
  7. Murdoch
    Online

    Murdoch Electrician's Arms

    Location:
    Woking
    Relying on "internet" advice could be an expensive mistake

    My recommendation is to get a price from the DNO to upgrade the incoming supply - then you can build it into your costings .

    But beware, it may take a few weeks for them to come out, then if you go ahead there will be a delay in in actually happening..

    Hope this helps
     
    • Like Like x 1
    • Agree Agree x 1
  8. buzzlightyear
    Online

    buzzlightyear still kicking sand, before pushing up daisies . Electrician's Arms

    Location:
    star command
    don't tell him pike . upload_2018-9-12_17-59-46.png
     
    • Funny Funny x 1
  9. static zap
    Offline

    static zap Regular EF Member

    Location:
    west midlands
    Parking for their electric vehicles !
     
    • Optimistic Optimistic x 1
  10. TonyMitchell
    Offline

    TonyMitchell Electrician's Arms

    Location:
    Berkshire, UK
    As above, this needs to be correctly designed and planned. However just looking at the top line numbers, assuming full occupancy it looks rather light, averaging just 21A per apartment, which could seriously limit what tenants do and when. You may be supplying just two fixed electric heaters, that's not going to stop tenants adding their own. If they all put a kettle on around the same time when they get up in the afternoon (student accom, right?) this could overload the installation. Seeing what's easily available from the DNO should be your first step.
     
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  11. Cadgey123
    Offline

    Cadgey123 Electrician's Arms

    Location:
    London
    If it’s for students - based on your description most likely will be ok.

    Wouldn’t be sticking my name to it until I had full loading specs from each unit. Ie heater sizes etc
     
  12. Vortigern
    Offline

    Vortigern Electrician's Arms

    Location:
    England
    Business Name:
    F.H. Electrical
    Perhaps consider heating from your gas boiler? Bear in mind those kind of rentals often leave without paying energy bills which no doubt would be high if you have electric heating.
     
  13. PEG
    Offline

    PEG Forum Mentor

    Location:
    Manchester
    Hi,as already mentioned,you need someone to do an assessment,with knowledge of the build plans,and methods of mitigating peak loads.

    It is not impossible,to arrange things,to achieve a reliable outcome,but is not a guess anyone will make,without full knowledge of all the factors....or you may be handing out your freshers,complimentary,travel-kettles...
     
    • Like Like x 1
  14. tlangdon12
    Offline

    tlangdon12 Regular EF Member

    Changing to gas heating might just shift the problem from an undersized electrical supply to an undersized gas supply.

    Improving the insulation in the studios might allow smaller electrical heaters to be specified, but kitchen appliances might be a bigger problem; the students are likely to want kettles, fridges and microwaves, toasters and possibly hobs. Even allowing for the fact that not everything will be on at once, I think electric heating and the small kitchen appliances will exceed the available supply. Only a proper design and better specification of the loads to be supplied will tell you whether the current supply is adequate or what larger supply will be required.
     
  15. PEG
    Offline

    PEG Forum Mentor

    Location:
    Manchester
    You could just supply those students with a paraffin stove and wind-up LED lamp...tell them a 6 month lease can go towards their Duke of Edinburgh award...
     
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