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Minimum Voltage at incoming supply point

FlyWheel
Retired now and not up to date with reg’s since 16th. Helping advise a friend. Currently they have 100amp single phase supply and whilst the no load voltage is up at around 238 volts, as the circuit is loaded, voltage drops off substantially. Even with a load of 50 amps, ie, half the supply fuse rating, voltage is slightly below the -6% limit, at around 215 volts, further load simply pushes voltage significantly lower, and by extrapolating measured data, it would be nearer 170 volts with a load of 100 amps, is this acceptable? I plan measuring Ze and pfc this week as a guide perhaps to supply loop impedance and, which I suspect must be causing this excessive drop. I’m aware of the ESQCR reg’s although need to update myself, but are there any other regulations that apply?

Parents
  • 0
    That last post should have ended with doors and windows, I blame predictive text. But the floors may need insulating.


    One of the things I picked up on at the ASHP seminar was that you need to install a priority heating and hot water controller.


    There was one on the gas central heating system in our house wh we bought it, the old gas boiler didn’t have enough umph to heat the hot water cylinder and the radiators at the same time, so you had to switch the controller to tell it which you wanted heating first, so if you set it to heating the radiators the hot water cylinder would not be heated at all until the radiators had got the house up to temperature and the central heating thermostat was satisfied.


    The ASHP manufacturers said you may need to do the same with the heat pumps.


    Loading shedding and priority switching won’t solve the voltage drop issue, but might have to be considered as part of the long term solution.


    Andy Betteridge
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  • 0
    That last post should have ended with doors and windows, I blame predictive text. But the floors may need insulating.


    One of the things I picked up on at the ASHP seminar was that you need to install a priority heating and hot water controller.


    There was one on the gas central heating system in our house wh we bought it, the old gas boiler didn’t have enough umph to heat the hot water cylinder and the radiators at the same time, so you had to switch the controller to tell it which you wanted heating first, so if you set it to heating the radiators the hot water cylinder would not be heated at all until the radiators had got the house up to temperature and the central heating thermostat was satisfied.


    The ASHP manufacturers said you may need to do the same with the heat pumps.


    Loading shedding and priority switching won’t solve the voltage drop issue, but might have to be considered as part of the long term solution.


    Andy Betteridge
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