Posted by John T on June 11, 2016 at 07:11:10 from (216.249.76.23):
In Reply to: Re: Electrical help posted by Jubamp;631 on June 11, 2016 at 06:49:51:
Good follow up questions, looks like you are understanding all this and are getting there:
"My main breaker has only one bus bar. It has both bare wires and white wires connected it (so the bare ground and the neutral to the same bar)."
That's sure possible, since in the MAIN the Neutral Buss is Bonded to the Equipment Ground Buss often with a cross tie bar ORRRRRRRRRRRRR a single common Buss where BOTH White Neutrals and Bare/Green Equipment Grounds ALL connect.
"So if I run a 4 wire to the sub panel that is where the ground and neutral will connect in my main panel correct?"
CORRECT you run the Equipment GroundING Conductor designed to carry ONLY Fault Current, and the Neutral GrounDED Conductor to carry normal return current from that common buss in your main panel.
"The next question is when the ground comes into the sub panel it will go to the grounding bar in the sub panel and the ground out to the load will also connect to that grounding bar and that basically will feed back to the neutral/grounding bar in the main breaker correct?
MOSTLY CORRECT. In the sub panel the separate insulated isolated GROUND BUSS connects to the Equipment GroundING Conductor you carried from the Main Panel and the Bare/Green Equipment GroundING Conductors out to shop loads wire to that Buss. The White Neutrals out to shop loads wire to the separate isolated Neutral Buss. NOTE AGAIN the Equipment GroundING conductor you ran out there will ONLY carry FAULT Current while the Neutral carries normal return current.
You done good
John T Long retired EE and rusty on latest codes so no warranty mind you but believe this is still correct
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