"Wayne" wrote in message
news
Thanks all, I understand now.
I woke up in the middle of the night and figured out part of it.
The neutral is only bonded to ground at the service (which I knew).
If it gets bonded elsewhere, then the conduit also becomes a conductor
(bad).

Particularly if you lose the neutral conductor. The conduit would then
return the unbalanced load and it would tend to heat up at fittings.