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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?

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    Thank you UKPN for your input, but I do not have to justify my data and calculations, nor declare the stage of my enquiries to you, I simply asked a question about voltage tolerance, and thanks to most of the Forum answers, have, in retirement, been reminded of many factors that affect network supplies generally, so I thank them all for that, and accept that they’ll always be one fly in the ointment that wants to move off in a tangent that helps justify their existence. Oh, and 6 months down the line, from when the customer first approached the DNO, they have not even been able to declare their Ze or admit to having any record of their cable routes in the area, but I’m looking into that separately. Back in the old IEE days, I contributed under a different pen name, and it was easy then to have a rational discussion without having to justify our data to the forum.

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    Thank you UKPN for your input, but I do not have to justify my data and calculations, nor declare the stage of my enquiries to you, I simply asked a question about voltage tolerance, and thanks to most of the Forum answers, have, in retirement, been reminded of many factors that affect network supplies generally, so I thank them all for that, and accept that they’ll always be one fly in the ointment that wants to move off in a tangent that helps justify their existence. Oh, and 6 months down the line, from when the customer first approached the DNO, they have not even been able to declare their Ze or admit to having any record of their cable routes in the area, but I’m looking into that separately. Back in the old IEE days, I contributed under a different pen name, and it was easy then to have a rational discussion without having to justify our data to the forum.

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