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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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    As I pointed out, you must use accurate metering of a particular type, which must be a very accurate true RMS meter. Normal average reading meters are no good at all if the waveform is even slightly distorted. Data loggers are of this type. Normal multimeters are usually average reading, RMS calibrated, so not much use. The car accuracy is probably very dubious! Its charger will be very well protected against most mains incidents, spikes and excess voltages, including automatic disconnection if it is not happy.
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  • 0
    As I pointed out, you must use accurate metering of a particular type, which must be a very accurate true RMS meter. Normal average reading meters are no good at all if the waveform is even slightly distorted. Data loggers are of this type. Normal multimeters are usually average reading, RMS calibrated, so not much use. The car accuracy is probably very dubious! Its charger will be very well protected against most mains incidents, spikes and excess voltages, including automatic disconnection if it is not happy.
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