Big J-cord

[acmemetalfab]

I need to be able to roll my welders around the shop to use them in my new space. Rather than hard wire more outlets in, I'd rather just get a big old J-cord and make an extension cord. I've got a Dynasty 300DX and a 350P; how thick should I get if I want 50 ft. of cord? Also, where's a good place to order this stuff?

[MAC702]

With figuring that duty cycle and rated outputs will roughly cancel each other out, you're looking at more than 60A of ampacity at rated output with the 350P. I'd use a #6 SJOOW service cord if at all available.

If you know you're always on the lighter side of the machine's capabilities while at that distance, you could probably survive on a #8, IMHO.