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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
    I think the simple truth is that in many cases the DNO don’t know the data, because the network is not being used as it was designed.


    Earlier this year I did a job in South Wales and posted some pictures of the suppliers tails at the intake, it is the only overhead five wire TNS earthed system I have seen, I definitely have not seen such an arrangement in this neck of the woods.


    Sat having a coffee one evening I followed the cables both ways on Google Street View, I was genuinely surprised how many homes are being supplied by this run of cables with probably at least a third of the homes having been built and added to the supply during the time the cables have been in place.


    The must be many places where the network is already stressed and simply cannot cope with EV charging and heating loads unless the extra demand is applied overnight.


    Andy Betteridge
Reply
  • 0
    I think the simple truth is that in many cases the DNO don’t know the data, because the network is not being used as it was designed.


    Earlier this year I did a job in South Wales and posted some pictures of the suppliers tails at the intake, it is the only overhead five wire TNS earthed system I have seen, I definitely have not seen such an arrangement in this neck of the woods.


    Sat having a coffee one evening I followed the cables both ways on Google Street View, I was genuinely surprised how many homes are being supplied by this run of cables with probably at least a third of the homes having been built and added to the supply during the time the cables have been in place.


    The must be many places where the network is already stressed and simply cannot cope with EV charging and heating loads unless the extra demand is applied overnight.


    Andy Betteridge
Children
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