Re: SOLIDLY GROUNDED NEUTRAL WIRE OF A 4 WIRE SYSTEM
I think that it violates 250.20(B)(2). The danger is that the neutral point might be at any voltage (“floating,” as Don mentioned). This could impose a voltage upon any and all equipment grounding conductors, and from there to the cases of all connected equipment. Whether this could shock a person touching a case would depend on many circumstances. But I see it as a hazard.
Why is this system set up in this manner?
Charles E. Beck, P.E., Seattle
Comments based on 2008 NEC unless otherwise noted.