# How many KVA for a new domestic supply ?

Discussion in 'Electricians' Talk' started by Gerry Built, Oct 6, 2006.

1. ### Gerry BuiltNew Member

I am getting a new domestic supply put in as the current supply needs to be moved due to me selling part of my garden off. To get a quote from Electricity Board they want me to specify the total load for the new supply in KVA. I tried the 'same as I have now' approach but they wont accept that. Can anyone tell me what a typical domestic supply for a 5 bedroom house should be (in KVA) ?

Thanks,

Gerry

2. ### eawr89New Member

24kVA (standard 100A cut-out)

3. ### sinewaveScrewfix Select

100amps x 230 volts / 1000 = 23 kva (single phase)
Therefore a quick ref is 0.23 per line amp

100amps x 400 volts x 1.732 / 1000 = 69.28 kva (3 phase)
(0.69 per line amp)

However DNO&#146;s round down to the following easy to remember standards and usually class supplies as follows.

A standard domestic service at 15 KVA usually has a 60-amp cutout fuse.
A standard domestic service at 20 KVA usually has an 80-100-amp cutout fuse.

Gerry

5. ### sparkin!New Member

100amps x 400 volts x 1.732 / 1000 = 69.28 kva (3 phase)
(0.69 per line amp)

assuming unity pf!;-)