Isolated Nuetral
- Thread starter csoc64
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petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- Semi-retired engineer
I never heard of anyone doing this. Maybe you can elaborate on what you actually mean. I suspect you actually meant to ask something other than what you did.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I think the op is asking why the equipment grounding conductor and the neutrals are separated in a sub panel. That would be my guess.
That is correct.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- Semi-retired engineer
Its a rule. I don't get it either since we commonly connect the service to ground at both the pole and the service disconnect.
RichB
Senior Member
- Location
- Tacoma, Wa
- Occupation
- Electrician/Electrical Inspector
my understanding--if I am reading the op correctly--is to ensure no neutral current on any EGC/GEC. If they were tied together at a sub-panel then you would have the potential for current to show up on any and all ground/bond wires--I think(?):?
Anyway that's my story and I'm sticking to it--until someone comes along and explains what I read wrong!!:slaphead:
Anyway that's my story and I'm sticking to it--until someone comes along and explains what I read wrong!!:slaphead:
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- Semi-retired engineer
I think that is the answer but why it would matter all that much is another thing.
This was a common install until fairly recently.
RichB
Senior Member
- Location
- Tacoma, Wa
- Occupation
- Electrician/Electrical Inspector
I agree---I think it was just a couple/three cycles ago they changed it
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
The motivation, without reading the comments around the change, would seem to be twofold:
1. Keeping normal current off the EGCs on general principles and
2. Allowing feeder breakers to be GFCI without having to rewire everything.
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