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Originally Posted by Gumby

The "not to use extension cords rolled up" thing I heard was due to ya know how ya wind a wire around a nail to make a magnet, the loops of wire still have a field effect, that causes more load then needed. we had to always lay out the cords at the job site.

That is incorrect. AC cords, extension or otherwise, will never make a magnet. The hot and neutral cancel the induction. You need a single wire for induction.