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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
    It was some years ago when I went to the seminar at The manufacturers in Hatfield  they told me they didn’t intend to release their air source heat pumps to the general trade or retail suppliers.


    They said they intended to only sell them through carefully selected approved installers as they considered them so difficult to specify and install, particularly to be retrofitted to replace other water and space heating systems in existing buildings, that if they let all and sundry have a go at installing them the products would get such bad reviews they would become unsalable.


    They also said that when air source heat pumps are retrofitted into an existing building to replace an existing central heating boiler the heating system needs redesigning with sections of pipework and radiators being increased in size along with significant expenditure on improving insulation as well as possibly replacing floors and windows.


    Andy Betteridge
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  • 0
    It was some years ago when I went to the seminar at The manufacturers in Hatfield  they told me they didn’t intend to release their air source heat pumps to the general trade or retail suppliers.


    They said they intended to only sell them through carefully selected approved installers as they considered them so difficult to specify and install, particularly to be retrofitted to replace other water and space heating systems in existing buildings, that if they let all and sundry have a go at installing them the products would get such bad reviews they would become unsalable.


    They also said that when air source heat pumps are retrofitted into an existing building to replace an existing central heating boiler the heating system needs redesigning with sections of pipework and radiators being increased in size along with significant expenditure on improving insulation as well as possibly replacing floors and windows.


    Andy Betteridge
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