I am moving from the US to the UK and would like to know if my welder will work on UK power. The welder is 240V 50/60 hz so that should be fine as I understand it... except, the welder is wired for US split phase so it has 4 wires (L1,L2,N,G) whereas UK power is 230V with only 3 wires (L,N,G) true single phase. Assuming I am correct so far, is there a reasonable way to run a 4 wire 240V split phase appliance on 3 wire, single phase 230V power?

EDIT: Thanks @Three for spurring me to actually open up the welder as it has completely changed my question. I had just (stupidly) assumed the 240V was 4 wire. The welder is wired (as is the receptacle) for 3 wire 240V. So the new (hopefully more accurate) question is-

My welder is wired for L1,L2,G 240V whereas the UK supply is L,N,G 230V. Is there a reasonable way to run or rewire to run a L1,L2,G 240V appliance on L,N,G 230V power?

  • 2
    Does the welder actually need neutral? I would be rather surprised if it actually used the neutral for anything...check to see if the white wire coming out of the cord is actually connected to the welder, or just is landed on a "dummy" terminal and does nothing as a result. Dec 25, 2019 at 0:48
  • You need to determine if N is actually connected to anything inside the welder. If it is that thing probably requires 120 V and the welder won't work with a 230 V, L-N-G connection. Since this is a product use rather than an electrical engineering design or theory question, I am voting to close.
    – Charles Cowie
    Dec 25, 2019 at 0:51
  • It's almost certainly connected to the chassis. The last time I looked at a Miller welder (I do SMAW and MIG), that's how it was arranged inside. I only spent about a half hour looking around, though, and I wasn't focused on this question. That said, I'm almost sure (my memory fails) that it wasn't used for anything else. But it's possible that switch lights and so on might be tied that way.
    – jonk
    Dec 25, 2019 at 0:52
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    @jonk -- tying neutral to chassis is improper, actually -- it should be connected to a floating "dummy" terminal if it's not used, otherwise the welder will trip every GFCI it encounters... Dec 25, 2019 at 2:31
  • Neutral may be chassis grounded even for 120V pdfasset.owneriq.net/b/1e/b1e65127-79fe-4040-be02-9acf903a51bc/… Dec 25, 2019 at 3:22

1 Answer 1


This is a factory question. The ruling question is whether the machine guts are insulated for 240V. Because one leg will be 240V from ground.

Is it really worth the shipping expense, though? It takes several times an object's weight in jet fuel to fly it intercontinental. Shipping of course is much better.

  • 4
    Many overseas moves are done by filling a container with everything from clothes to furniture to dishes, and then weight doesn't matter much. Dec 26, 2019 at 20:40
  • 2
    @Harper, Don't really understand your answer. I will be filling a 20' shipping container so weight/volume is no problem.
    – JD345
    Dec 27, 2019 at 1:39

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