Does the code require that if a isolated ground receptacle is installed it must go back to an isolated ground in a panel? Or would it be allowed to install the isolated ground and still run it back go the same ground on a panel. I know this defeats the purpose of isolated ground, but does the NEC allow it.
Isolated ground receptacle
- Thread starter cppoly
- Start date
- Status
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
250.146(D) is written in a permissive context. You are allowed to run the isolated ground all the way back to the main panel without bonding it to any ground bar in any intermediate panel. But this is not a requirement.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Is the receptacle required to be IG?
If so, then the choice of termination points may be more limited.
Tapatalk!
If so, then the choice of termination points may be more limited.
Tapatalk!
mopowr steve
Senior Member
- Location
- NW Ohio
- Occupation
- Electrical contractor
If I'm not mistaken, if you are required to have IG receptacles then the isolated ground wire must stay isolated thru any sub-panel via isolated terminal bar and all the way back to the first means of disconnect where equipment grounds/neutrals/grounding electrode all tie together as well as your isolated ground wire.
Last edited:
The IG receptacle is not required. It appears a few of them were used just for the appearance of a special receptacle. I am confused because there is no isolated ground in the panel serving the area so I'm sure the IG conductor will be terminating on a normal grounding bar in the local panel along with other convenience receptacles. It defeats the purpose of the isolated ground receptacle. My best guess is that it gives the appearance of a IG receptacle and that was the intent only. Just wonder if code allows this.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
The NEC doesn't really care where in the system that you terminate the IG. You could run a bonding jumper right to a grounded metal box.
mopowr steve
Senior Member
- Location
- NW Ohio
- Occupation
- Electrical contractor
Yea, I forgot it is not a NEC issue more so a performance issue which sounds like has been a farce and don't hear to much about IG recepts anymore.
I agree. The IG "exception" just permits the IGC to run through one or more metal enclosures and/or boxes without having to bond to the enclosure, box, or device(s) therein. The supply-end termination of an IGC is not required to be isolated from the EGC no matter where it is located.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Required by what? The NEC never requires IG. Perhaps the owner has a requirement for IG. In that case, if you don't keep the ground isolated all the way back to the main panel, then you will not have satisfied the owner's requirements. But you will not have violated any code requirement.
- Status