chris.doyle.391
Member
- Location
- Ukiah ca
Hey thanks guys for all the help
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Chris, sounds like there is a grounding conductor mixed wired with a phase wire after the disconnect.
That's inline with what I'm thinking.... but you'd need two faults, with at least one having fairly high resistance to ground, to read 480V to ground on the load side of an open disconnect and also not trip any OCPD when the disconnect is closed... and that's assuming it's an ungrounded system.Something is ungrounded. There's just no way in the world a solidly grounded wye system is gonna give you those voltages.
The description is confusing, so I'm not at all clear what you're up against, but I can say with certainty if you've actually got a shifting phase-to-ground voltage it's because of a ground-fault on an otherwise ungrounded system.
I have to think about this more and maybe draw it out, but here's my initial raw train of thought.That's inline with what I'm thinking.... but you'd need two faults, both with a fairly high resistance to ground, to read 480V to ground on the load side of an open disconnect and also not trip any OCPD when the disconnect is closed.
Alright I'll try my solenoid tester if I can find it. I haven't used one of those since the 90's haha
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Not getting any "vibe" on your "dust" supposition at present....
What doesn't fit is the part about ALL 3 reading 480V to ground. The one that is shorted should read zero because it would be at the same potential. ...