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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 over 5 years ago

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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0 AJJewsbury over 5 years ago

Hi Andy I would be interested to read up and learn a bit more on this if you can point me to some documentation.

Some bedtime reading: https://www.beama.org.uk/asset/186E3B6E-CFEB-4C75-B599624295252303/ (skip to appendix B for the risk assessment and flash density map)

Also keen to understand what my lightning flash density is as I have now installed outdoor WiFi access points all around my land but conveniantly ignored the advise to get a lightnight surge protection device fitted in line with the Ethernet cable.

Ah, if you want effective protection from lightning induced surges you really need to consider every metallic cable entering the building/installation - phone lines and any Ethernet, submains to remote building as well as the mains supply. Not much point just plugging half the holes in a colander.

This is why I got the Earth Neutral break monitoring device to disconnect power supply to my EV if there is a break in neutral.

I was thinking more of damage to the rest of the installation & appliances.

- Andy.
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0 AJJewsbury over 5 years ago

Hi Andy I would be interested to read up and learn a bit more on this if you can point me to some documentation.

Some bedtime reading: https://www.beama.org.uk/asset/186E3B6E-CFEB-4C75-B599624295252303/ (skip to appendix B for the risk assessment and flash density map)

Also keen to understand what my lightning flash density is as I have now installed outdoor WiFi access points all around my land but conveniantly ignored the advise to get a lightnight surge protection device fitted in line with the Ethernet cable.

Ah, if you want effective protection from lightning induced surges you really need to consider every metallic cable entering the building/installation - phone lines and any Ethernet, submains to remote building as well as the mains supply. Not much point just plugging half the holes in a colander.

This is why I got the Earth Neutral break monitoring device to disconnect power supply to my EV if there is a break in neutral.

I was thinking more of damage to the rest of the installation & appliances.

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

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