On 2/16/17 08:38, Chuck McCown wrote:
But they run back to two different bars. The neutral bar and the ground bar. Then normally those two are bonded and the ground bar goes to the building entrance ground rod. Any bad connection coupled with decent amount of current causes voltage differences.
Bonded only at the service entrance and separate at sub-panels; that's important.
Also worth considering: there was a time when separate ground conductors wasn't required and it was OK to use the metal conduit itself as the ground path. This is no longer allowed because over time conduit fittings can loosen and make the ground bad, possibly intermittently.
~Seth
