Industrial Unit - electricity supply
Discussion
Hoping someone knowledgeable can give me an idiots guide to power for an industrial unit we are leasing.
We need 3-Phase power 400V connections for around 6 systems we run on an intermittent basis, no more than 2 running at the same time. The small systems draw 32A at peak but for a few seconds max, the air compressor is a 11Kw motor and runs intermittently to keep up the pressure in a small run of pipe work, obviously more often when tools are running. The unit when I viewed it initially had around 8 400V plug sockets dotted around the periphery - ideal. They were however removed on the completion of the unit re-furb!
When I enquired with the distribution co. about the incoming supply, I was told it was "60Kva 3-Phase, 20Kva per phase". The electrician we have on the fit-out works states that this is way too low "86A to site, 28A per phase" and cant be right for a 6500SQ ft industrial building.
I have very little understanding of electrics unfortunately, so i'm not sure why the figure stated seems to be perceived as too low, and also if it is realistically too low for our needs.
Anyone who can give an opinion and help me calculate if we have a problem is most welcome!
We need 3-Phase power 400V connections for around 6 systems we run on an intermittent basis, no more than 2 running at the same time. The small systems draw 32A at peak but for a few seconds max, the air compressor is a 11Kw motor and runs intermittently to keep up the pressure in a small run of pipe work, obviously more often when tools are running. The unit when I viewed it initially had around 8 400V plug sockets dotted around the periphery - ideal. They were however removed on the completion of the unit re-furb!
When I enquired with the distribution co. about the incoming supply, I was told it was "60Kva 3-Phase, 20Kva per phase". The electrician we have on the fit-out works states that this is way too low "86A to site, 28A per phase" and cant be right for a 6500SQ ft industrial building.
I have very little understanding of electrics unfortunately, so i'm not sure why the figure stated seems to be perceived as too low, and also if it is realistically too low for our needs.
Anyone who can give an opinion and help me calculate if we have a problem is most welcome!
Has your electrician got that right?
20kVA = 20,000VA
20,000VA/240V = 83A per phase.
Even if he'd used the phase voltage of 415v that would have given 48A. I can't get 86A total from 60kVA no matter which figures I use. Can you ask him how he's calculating it?
86A total is barely more than domestic houses get so that cannot be correct for the total supply.
20kVA = 20,000VA
20,000VA/240V = 83A per phase.
Even if he'd used the phase voltage of 415v that would have given 48A. I can't get 86A total from 60kVA no matter which figures I use. Can you ask him how he's calculating it?
86A total is barely more than domestic houses get so that cannot be correct for the total supply.
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