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Minimum Voltage at incoming supply point

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?

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  • AncientMariner:

    If due to load restrictions and with poor efficiency of Air Source during a cold night, the best Tariff may be a Gas one.....  ?

    I'll get my coat!


    Clive




    My thoughts too Clive, do dislike keeping all eggs in one basket with home energy, but no mains gas here, which of course leaves bulk storage gas tank or oil, and I'll be looking at those options as part of home energy advice. Not something they'll want to hear perhaps after just paying out over £10k for pool heat pumps! Are you really an "ancient mariner", or simply have a connection with old boats? I run the sailing programme for a Sailing Trust, so guess I'm perhaps an "anciaent mariner" too!

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  • AncientMariner:

    If due to load restrictions and with poor efficiency of Air Source during a cold night, the best Tariff may be a Gas one.....  ?

    I'll get my coat!


    Clive




    My thoughts too Clive, do dislike keeping all eggs in one basket with home energy, but no mains gas here, which of course leaves bulk storage gas tank or oil, and I'll be looking at those options as part of home energy advice. Not something they'll want to hear perhaps after just paying out over £10k for pool heat pumps! Are you really an "ancient mariner", or simply have a connection with old boats? I run the sailing programme for a Sailing Trust, so guess I'm perhaps an "anciaent mariner" too!

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