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3 phase 100A power supply - voltage at each phase goes up to 250+ Volts should I be worried?

Former Community Member
Former Community Member
New 3 phase power supply installed and live from an ICP (independent connection provider) and meter installed, the service is all sealed up and live.


My NICEIC electrician has now installed an 18 way distribution box after the 4 pole isolator from meter tails and everything seems to be all ok, we also made sure to achieve compliance with 18th edition amendment 1 as I have an electric vehicle on the property that will be charged.


I also got a 4 pole Type 1 surge protection device to be installed (Hager JK101SPD) in-line with the mains incomer so that all the ciruits behind it will be protect.


The car is protected behind a Type A and Type B RCD which is 4 pole and 40A (as per the manufacturer's guidelines). The charger also has other safety features such as earth monitoring and neutral-earth fault detection.

However, the car shows at peak and middle of the night the voltages around constant at 250V and sometimes sits as high as 257V (does not seem to go beyond that).


Is this something I need to be worried about? Or should be I be okay?


Appreciate your insights please.


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    It is normal for voltages to move around a bit, although the 257V you suggest is a bit higher (253V) than one would expect. To measure this properly one needs a high accuracy true RMS meter (0.1% or better) which you may not have. It is not a cause for concern anyway, and is very unlikely to damage your car.
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    It is normal for voltages to move around a bit, although the 257V you suggest is a bit higher (253V) than one would expect. To measure this properly one needs a high accuracy true RMS meter (0.1% or better) which you may not have. It is not a cause for concern anyway, and is very unlikely to damage your car.
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