Anybody who has checked the wire gauge on power cords for shop equipment or home appliances has probably found them to be undersized. But the NEC doesn't dictate the size of power cords; the manufacturer does. In the case of your welder, the engineers at Lincoln probably figured out the welder will trip its thermal protection long before the 12 gauge power cord overheats.
I use a 12 gauge extension cord on my 170 amp MIG welder. It's never been a problem even on the highest settings, but I can't weld very long at max voltage and wire speed before the thermal switch trips.
None of that changes the requirements for wiring a 240V/50A outlet. It needs to be wired for 50 amps: AWG 10 wire (minimum) and a 50 amp breaker.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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