Steve, isn't it true that a circuit can be derated, per code, when it's a dedicated circuit for a low-duty cycle appliance like a welder?
I use a 10 gauge 100' extension cord with my TIG sometimes. Drawing as much as 50 amps, but in short spurts with breaks in between. The welder has a 20% duty cycle at max output, so it's only even possible to draw 50 amps for 2 minutes out of every 10. 2 minutes of arc time out of 10 doesn't sound like much, but I've NEVER had the welder shut off due to duty cycle. I've checked the cord after doing alot of welding and it has never even been warm.
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