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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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    Just anecdotally, I had a situation recently where I installed a well know high quality charge point. It kept tripping out as it was measuring and over-voltage of between 257 and 262. My tester measured a constant 251-252V. I got the DNO involved and they measured 248V. Finally, it turned out the charge point had not been calibrated properly. A slight adjustment and everything was ok. I guess the moral of the story is you can only really rely on equipment calibrated to a specification, and everything worse may be not accurate enough.
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  • 0
    Just anecdotally, I had a situation recently where I installed a well know high quality charge point. It kept tripping out as it was measuring and over-voltage of between 257 and 262. My tester measured a constant 251-252V. I got the DNO involved and they measured 248V. Finally, it turned out the charge point had not been calibrated properly. A slight adjustment and everything was ok. I guess the moral of the story is you can only really rely on equipment calibrated to a specification, and everything worse may be not accurate enough.
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