Do Portable welders like an 8-pack, or single large welding machines on trailers have to be grounded to earth with a GEC? We have a lot of them on the job and I am having trouble locating anything about a GEC. These are hardwired from a 220 and 480 VAC panels..transformer for 120/208 has no GEC to X/O bond from case of xfmr.

Thanks for any input.

Greg

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