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
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’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.
WPD will treat anything above 12kW with 'caution', and will look to provide 3 phase for anything above 18kW. If you were to ask your DNO for their typical max demand for domestics, they will tell you. Then simply quote that. Off peak has very different rules!