Years ago, when I did plant maintenance, I got a job at a place that had just fired a guy for sub-standard work. They had 240v chain hoists that the man had wired one leg direct, meaning one leg at the fuse box was run through the fuse and the other leg was TOTALLY unswitched. One of the supply cables got pinched and shorted the protected leg. The fuse blew, but the wire welded to the steel trusswork. The guy running the hoist had his back to the fireworks, and didn't hear anything because of the plant noise. The hoist slowed WAY down and fried after a few seconds. After that happened I got to looking at the wiring, and there was ALL kinds of stuff that he had done that way. I haven't done that kind of work in MANY years and motors have changed alot since the early 80's but it might be worth looking at.