This discussion is locked.

You cannot post a reply to this discussion. If you have a question start a new discussion

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.

Parents

0 Former Community Member over 5 years ago

tattyinengland:

HI FaeLLe

I assume the ICP has connected you to the national grid - a public supply - and not a private supply? I assume you don't have your own transformer?

In which case - other than maybe the 4 pole isolator - and how that makes/breaks the neutral; I'd let the national grid worry about the amount of volts they put out there. The kit can almost certainly take 257V.

All should be OK I think.

Kind Regards

Tatty

Thank you for the reassurance Tatty! I was told that sometimes the live cable joining that happens at the street could cause issues which might cause voltage fluctuations.

When my electrician who put up the distribution box measured the voltage it did show 240 to 245V at each live cable , was just wondering if things might have varied since then especially at off peak times (after midnight) when unused voltage was all flowing across to me.

Also the fact that the electricity substation with the LV board is right next to my property did give me a bit of a scare.
Cancel
Vote Up 0 Vote Down

Cancel

Reply

0 Former Community Member over 5 years ago

tattyinengland:

HI FaeLLe

I assume the ICP has connected you to the national grid - a public supply - and not a private supply? I assume you don't have your own transformer?

In which case - other than maybe the 4 pole isolator - and how that makes/breaks the neutral; I'd let the national grid worry about the amount of volts they put out there. The kit can almost certainly take 257V.

All should be OK I think.

Kind Regards

Tatty

Thank you for the reassurance Tatty! I was told that sometimes the live cable joining that happens at the street could cause issues which might cause voltage fluctuations.

When my electrician who put up the distribution box measured the voltage it did show 240 to 245V at each live cable , was just wondering if things might have varied since then especially at off peak times (after midnight) when unused voltage was all flowing across to me.

Also the fact that the electricity substation with the LV board is right next to my property did give me a bit of a scare.
Cancel
Vote Up 0 Vote Down

Cancel

Children

No Data

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

Community Rules & Guidelines