Miller spot welder LMSW-52 with timer 230V 2.5kva plug rating?

[miller_130xp]

What type of plug comes with this welder? The manual says tandem plug. Is this a 20amp or 30amp plug?

[Aeronca41]

Please post the serial number so we can look it up.

[Broccoli1]

https://www.millerwelds.com/files/owners-manuals/O716H_MIL.pdf

Not much help though.

The specs state 2.5KVA 30amps 10g power cord so I'm guessing a 6-30p is on the machine.

[Aeronca41]

Agree. There is a picture of the timer plug on page 23 of the manual and it sure looks like a 6-30p.

[miller_130xp]

The plug on the spot welder fits a 6-20p. I did some searching and found this interesting thread. I don't like it that I would need to install a 20amp outlet on a 30amp breaker. That seams it is against code. This thread addresses the issue but I'm not sure how to move forward. I thought maybe someone changed the plug but that seams not to be the case.

http://www.tractorbynet.com/forums/r...tml#post229893

[Aeronca41]

See NEC (NFPA 70) Article 630. Special rules for welders.

[miller_130xp]

I'm going to install a 20amp breaker and 6-20P outlet for 220V. The welder will be over protected. It may trip the breaker at times.

[Aeronca41]

That is obviously perfectly safe. Please let us know how many nuisance trips you get if any.