KVA rating help...

[delangecycles]

Hello,
Just bought a welder and need to buy a transformer to run it. I would like to confirm my KVA rating calculations, thanks. Transformer will be 240V to 600V

Welder is Lincoln TIG-300

Input to welder, as states on nameplate, is 575V at 42 amps
60Hz , single phase
the manual also states Super Lag fuse amps at 70

Workshop is 230V and CB is 30 amps (dryer outlet). I would increase the CB accordingly and perhaps have to rewire directly from box with correct size wire?
Any suggestions.

I am not using the welder at full capactiy. Only TIG welding thin walled tubing and such.

Would a 15KVA transformer work?

Thanks

[smarbaga]

those are the wierdest numbers that i have ever heard.
575 volts single phase???
u might want to check that out again.
at 240 volts thats about 100 amp fuses

[Geof]

Smarbaga is correct; single phase 575V is unusual but assuming that is what you have I think you will be pushing it trying to use a 15 kva transformer. Have you found a transformer for 230V to 575V single phase?

I think this is one where you should get hold of an industrial electrician and get a proper opinion. The spec for a Super Lag fuse at 70A and 575 V suggests this thing has a huge, and prolonged, inrush current which is equivalent to 175 amps or more at 230V. If you hook this up to house wiring you have a chance of popping the pole fuses.

[delangecycles]

Yes Geof,
You are correct, I have also calculated the same numbers. It is indeed single phase, 575V input Smarbaga. I have found a transformer but not the correct KVA. The proper KVA rating should be about 40, which is pretty large. I just was wondering if anyone had any experience with running a smaller one.
Thanks anyways...

[Al_The_Man]

I have used a 575/240 1ph txfr in 'reverse' for an Electro-Arc tap disintegrator without problems, you should at least use the correct wire size for the transformer size and fuse it accordingly, If you accidentally overload it with the welder you will at least have the right protection.
Al.