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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
    One of my former customers is on the Sunday Times Rich list, he only has a four bedroom house, but it is the bed four bedroom house you will probably ever see.

    The house has two three phase supplies rated at 60-amps, one in the house and the other one in the swimming pool house with the pool being electrically heated with traditional heaters.


    Another customer has ground source heat pumps and a solar photovoltaic array installed a few years ago which he makes a profit on when it’s running, so leaves the heating on whilst on holiday, though that may not be possible with a new set up.


    As I passed comment above the answer to the problem is probably to throw some money at it as an investment that will reap future benefits, however it does need the DNO, metering services and suppliers to cooperate and getting them to do so can be a long process.


    Andy Betteridge 




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  • 0
    One of my former customers is on the Sunday Times Rich list, he only has a four bedroom house, but it is the bed four bedroom house you will probably ever see.

    The house has two three phase supplies rated at 60-amps, one in the house and the other one in the swimming pool house with the pool being electrically heated with traditional heaters.


    Another customer has ground source heat pumps and a solar photovoltaic array installed a few years ago which he makes a profit on when it’s running, so leaves the heating on whilst on holiday, though that may not be possible with a new set up.


    As I passed comment above the answer to the problem is probably to throw some money at it as an investment that will reap future benefits, however it does need the DNO, metering services and suppliers to cooperate and getting them to do so can be a long process.


    Andy Betteridge 




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