... Come to think of it,..here's something we encountered on a service upgrade,... after all was said and done,..we popped the meter back in, hit the main, and started flipping the branch circuit breakers on,... then, BAMM,..one of the breakers kept tripping, as if it were a dead fault,..after a little detective work, and practically pulling all of the circuits off their breakers, we found the problem,.. sometime ago, some yutz spliced into a branch circuit, and re-fed it,..with the same phase,..so it didn't blow,..now that the new breakers were installed and relocated in the panel, that backfed circuit now landed on the opposite phase...
... I love old houses,.. [Linked Image] [Linked Image]
Russ

.."if it ain't fixed,don't break it...call a Licensed Electrician"