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Large house

lyledunn
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.
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    Two not very fast EV chargers and one electric shower will use about 100 amps in total, without any cooking, space heating, or other loads.

    That to me suggests the likely need for a three phase supply of 100 amps, or at the very least split phase at 100 amps.


    Even with good insulation 400 square meters would probably require at least a 24Kw gas boiler, or say 12 Kw of electricity for a heat pump.


    A guestimate of the larger loads could include

    Space heating=12 Kw. No diversity allowable.

    Cooker= 5Kw Very little diversity allowable, since it has already been applied to the cooker rating.

    Shower=9Kw

    A couple of EV chargers=14 Kw. No diversity allowed in my view, both could run at full load for hours.

    Water heating=3 Kw. No diversity allowable.


    Consider the possibility, even a probability of a second shower, a larger cooker, and a load of portable heaters when the heat pump breaks.

    Small appliances are unknown, but consider perhaps 4 ring finals with an assumption that one will be fully loaded and the other three much less so.
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  • 0
    Two not very fast EV chargers and one electric shower will use about 100 amps in total, without any cooking, space heating, or other loads.

    That to me suggests the likely need for a three phase supply of 100 amps, or at the very least split phase at 100 amps.


    Even with good insulation 400 square meters would probably require at least a 24Kw gas boiler, or say 12 Kw of electricity for a heat pump.


    A guestimate of the larger loads could include

    Space heating=12 Kw. No diversity allowable.

    Cooker= 5Kw Very little diversity allowable, since it has already been applied to the cooker rating.

    Shower=9Kw

    A couple of EV chargers=14 Kw. No diversity allowed in my view, both could run at full load for hours.

    Water heating=3 Kw. No diversity allowable.


    Consider the possibility, even a probability of a second shower, a larger cooker, and a load of portable heaters when the heat pump breaks.

    Small appliances are unknown, but consider perhaps 4 ring finals with an assumption that one will be fully loaded and the other three much less so.
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