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Domestic upgrade to 3 phase...

D4G

Hi All 

I have a customer that is upgrading his supply to 3 phase. Not entirely sure why but wants a 22kW EVCP.

He currently has a single phase supply feeding 2 consumer units which are under the stairs.

He is looking to get the 3 phase supply to the side of the property and requires connection to the existing wiring.

I do a lot of industrial 3 phase work but not domestic!

My idea is to run a suitable cable from the new supply to under the stairs and fit a 3 phase cu to pick up the existing wiring. 

Should I be making any efforts to balance out the load on the supply?

Could the 3 phase supply just be split and feed the existing consumer units??

Thanks in advance Grinning

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    As you have 2 consumer units, one per phase may be the easier way to do this. The load on the street cable will not be any more or less unbalanced than it was yesterday, and this is not a factory with hundreds of amps per phase that dominates the substation.

    Now, if you were doing a full re-wire then to fit 3 single phase CUs or one 3 phase one and balance up the loading would be the preferred, but for now that is not essential. I do suggest a 4 pole isolator (example REC4 ) before any consumer units, so that there is still a very clear single point of isolation.

    If the CUs  have to come out anyway for some other reason then maybe rethink into 3 groups.

    Mike.

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  • 0

    As you have 2 consumer units, one per phase may be the easier way to do this. The load on the street cable will not be any more or less unbalanced than it was yesterday, and this is not a factory with hundreds of amps per phase that dominates the substation.

    Now, if you were doing a full re-wire then to fit 3 single phase CUs or one 3 phase one and balance up the loading would be the preferred, but for now that is not essential. I do suggest a 4 pole isolator (example REC4 ) before any consumer units, so that there is still a very clear single point of isolation.

    If the CUs  have to come out anyway for some other reason then maybe rethink into 3 groups.

    Mike.

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