Are there any generally accepted tolerances for this in a three phase motor? I've seen <10% as a limit from a couple of sources, but I was wondering at what point it should become a concern. I've got a couple motors where one phase is about 15% off the average - I'm just not sure if it's a real world problem. Most of the readings I've ever taken have been pretty tightly together. I'd appreciate the benefit of anybody else's experience. Thanks.