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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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    I have reviewed my paperwork at home.


    The contract with the DNO to install a supply was for a maximum capacity of 100 Amps subject to an after diversity maximum demand of 30 kVA.


    I cannot find any reference to maximum supply in the contract with my supplier, including their deemed contract.


    It seems unlikely to me that a developer would pass on such details to a first occupier, and even more unlikely that the details would survive a succession of occupiers. So, in the vast majority of cases, only the DNO would know what was contracted originally. Whether they can disclose that information is entirely dependent upon their record keeping.


    Incidentally, I assume that most electricians would put the fuse rating (or 100 A if unknown) in the box for "maximum demand" in an EIC because the ADMD will probably not be known, especially for alterations and additions.

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