The standard supply for a new house seems to be circa 18KVA single-phase. I have a client who needs to make application for a supply for a new build house at 400m2 with the only certain information being that an air source heat pump is to be used for heating. The client simply does not know what the electrical loading might be. The house is only coming out of the foundations but the DNO supply may take many months as the house is in a relatively remote rural location, thus loading details are required before the DNO will consider progressing the proposal. It is a big house, but that is what it is, just a big house. I am inclined to advise a standard supply but 3-phase as with a large AS heat pump, maybe shower, cooking and perhaps an EV or two, 18KVA wouldn't be long being gobbled up. As we move towards a higher reliance on electric as a power source for some heavy current-using equipment, it might be that 18KVA is no longer a realistic standard supply for even the smaller property.
18 kVA presumably after diversity else why not 23 kVA? But it does seem to be the norm here in SSE-land.
I wouldn't (didn't) think twice about getting three-phase. OK, you need a three-phase main DB, but the cost is a drop in the ocean of a 400 m² build. Never mind heat pumps, etc., don't you want fast EV charging?
ETA: a three-phase supply avoids smart metering. ?
18 kVA presumably after diversity else why not 23 kVA? But it does seem to be the norm here in SSE-land.
I wouldn't (didn't) think twice about getting three-phase. OK, you need a three-phase main DB, but the cost is a drop in the ocean of a 400 m² build. Never mind heat pumps, etc., don't you want fast EV charging?
ETA: a three-phase supply avoids smart metering. ?
