Originally Posted by OLNOLAN
First off the information I supplied to HotRodMan is for a permanent installation in his garage that I know he will never have any problems with. Safe advise. 50 amp supply, 50 amp wiring, 50 amp receptacle. No fudging.
If anyone is interested in how ampacity of the supply conductors can be sized, or how the primary overcurrent can be sized in accordance with the NEC, read Article 630, it explains what is permissible. The primary overcurrent device sizing and supply conductor sizing recommended in the Lincoln manual appears to be in accordance with what is allowable in NEC Article 630.
Hint- It involves Duty Cycle. In todays litigious society, I choose to NOT recommend what you can get away with or what you can fudge on.
Emailed Miller with my question, here is the answer:
"We actually recommend a 30 amp breaker for the MM180. It has a 50 amp style plug on it in an effort to keep the plugs on our machines consistent. You could wire a 50 amp receptical to your 30 amp service, the plug will just be oversized for the application. We do not make any off the shelf pigtails to go from the 50 amp style plug to the 30 amp style plug, you would have to make one"