Have a weird problem at work with a 3 phase 13.2kW motor. It blows fuses but the overload doesn't trip. We checked the windings for a ground and it's not grounded. Brought it to a motor place and they had a "good" and "bad" tester for it and they say it's fine. :huh I think they used a megohmmeter. Some dude says it's the bearings. So I just replaced them. The front one looked like it overheated and had a bit of drag. Any ideers? We haven't tried it yet. 480VAC @ 22 amps at nameplate. Oh, and we tried it without the leads hooked up to the motor so it isn't the leadwires.