F-Dawg
Member
- Location
- Rancho Cucamonga, California
Is it a NEC requirement to have a N to G bond at the PV disconnect and at the utility main switch board? See drawing for details. I thought it was supposed to be only bonded in one location.
Neutral to Ground bond at PV AC disconnect and at utility main switch board?
- Thread starter F-Dawg
- Start date
- Location
- Illinois
- Occupation
- retired electrician
It must be bonded at every service disconnect. You have a line side connection, so your PV disconnect is a service disconnect.
jaggedben
Senior Member
- Location
- Northern California
- Occupation
- Solar and Energy Storage Installer
Under the latest versions of the NEC the N-G bond is required as Don describes. Under early codes the options were more ambiguous.
Given the N-G bond in the PV disconnect, in my opinion there is no need for the green wire between the PV disco and the main switchboard. The grounded conductor is grounded in a Common Location (see 250.64(D)(3)). Bringing the grounded conductor to the PV disco and bonding in to the EGC there meets all other requirements (such as 240.24(C)) and the green wire I mentioned simply provides a parallel path for objectionable neutral current. Alternatively the green wire could be taken from the PV disco directly to the electrode or as a GEC tap (250.64(D)(1) or (2)) but I don't think it's necessary.
Given the N-G bond in the PV disconnect, in my opinion there is no need for the green wire between the PV disco and the main switchboard. The grounded conductor is grounded in a Common Location (see 250.64(D)(3)). Bringing the grounded conductor to the PV disco and bonding in to the EGC there meets all other requirements (such as 240.24(C)) and the green wire I mentioned simply provides a parallel path for objectionable neutral current. Alternatively the green wire could be taken from the PV disco directly to the electrode or as a GEC tap (250.64(D)(1) or (2)) but I don't think it's necessary.