Consensus seems to be isolated ground receptacles are obsolete, only to be done if the job specs require it. I was reading through 250.146D. I only see where it is permitted to be ran or spliced (or not), not where it is required to be landed. In an old EC&M article, Mike says it is permitted to be landed to the box immediately with the device. https://www.ecmweb.com/content/article/20890911/the-basics-of-isolated-grounding-receptacles. Can someone direct me to the Code article that might clarify the required termination point?
Isolated ground receptacles
- Thread starter Pinnie
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician
There really is no article to cite. IG's are a design issue so there is little guidance within the NEC on how to design and install them. Typcially the IG gets terminated at the service neutral where the MBJ is installed or at a transformer neutral where the SBJ is installed.
I’m guessing that’s common practice because the permissive language in 250.146D says the wire can be unspliced passing through boxes, panelboard enclosures etc. for the purposes of being terminated solely at XO or MBJ/SBJ. What’s to stop someone from landing it directly to the box of the device? Purely specs?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Nothing. And the NEC doesn't care. Similarly someone could install a non-IG receptacle and defeat the entire IG design concept.
So the only NEC requirements are that it have a orange triangle lol?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Pretty much yes. The NEC does give you exceptions (i.e.-the passing through that you mentioned) to the EGC rules so that the IG system can actually be installed as designed.