Have you somehow configured a power source (such as PV backfeed) on that circuit? Or cross connected two different voltage sources?
Negative voltage drop implies power flowing toward the distribution point rather than away from it.
Tapatalk!
Not nearly as interesting fireworks as the same error in real life!I see; what I did is feed a 120/208v panel from a 277/480V panel but forgot to include a stepdown transformer.
Thanks.
Not nearly as interesting fireworks as the same error in real life!![]()