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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

Parents
  • 0

    it would but if there was a dead short on the ring say, then the odds are good that the 32A and 63A would fire more or less equal chances of either, or both. This should be so rare as to not matter.

    Mike.

  • 0 in reply to mapj1

    Belt and braces safety then Mike.

    Z.

  • 0 in reply to Zoomup

    it might be nicer if only the breaker in the final CU tripped do we really want a faulty cooker killing lights and sockets as well ?

    A death or glory fuse of 60- 80 A would be nicer in many ways - and even better reliability figures  than an MCB.

    Mike.,

Reply
  • 0 in reply to Zoomup

    it might be nicer if only the breaker in the final CU tripped do we really want a faulty cooker killing lights and sockets as well ?

    A death or glory fuse of 60- 80 A would be nicer in many ways - and even better reliability figures  than an MCB.

    Mike.,

Children
  • 0 in reply to mapj1

    Yep, and cheaper as well. Large fault currents can blow an H.R.C. fuse within half a cycle, and that will be a little slower than the M.C.B. operation. But a cooker fault is more likely to be a L to E short of limited impedance and probably cleared quickly by an R.C.D. I can't imagine a dead short on the cooker wiring or supply cable being very likely. Modern ovens are mostly just plugged into a 13 Amp socket these days. We have been very careless about reliability and reducing the incidences of nuisance tripping, just consider split load consumer units. One recent poster had 10 ways running through just one R.C.D.

    edited post.

    Z.

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