3Ø 100amp Question

Rahul Patel · Sep 12, 2018

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

MJPD29 · Sep 12, 2018

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

Adam W · Sep 12, 2018

I reckon it should be.

Andy78 · Sep 12, 2018

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.

Deleted account · Sep 12, 2018

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.

buzzlightyear · Sep 12, 2018

Rahul Patel said:
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?

so whats your loading ?

Octopus · Sep 12, 2018

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

buzzlightyear · Sep 12, 2018

Murdoch said:
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..

don't tell him pike .

[ElectriciansForums.net] 3Ø 100amp Question

static zap · Sep 12, 2018

Parking for their electric vehicles !

Deleted member 105166 · Sep 12, 2018

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.

Cadgey123 · Sep 12, 2018

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

The Ghost · Sep 12, 2018

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.

PEG · Sep 13, 2018

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...

tlangdon12 · Sep 13, 2018

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.

PEG · Sep 14, 2018

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...

3Ø 100amp Question

Rahul Patel

MJPD29

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Adam W

Andy78

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Deleted account

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buzzlightyear

-

Octopus

buzzlightyear

-

static zap

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Deleted member 105166

Cadgey123

-

The Ghost

PEG

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tlangdon12

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PEG

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