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Wrenches,
I need similar advice, please, especially a Code section citation. In 2005 we installed an Outback system for a new home in town that was designed and installed to be a grid-backup solar home. It was, in essence, a stand-alone system to run most of the home with the utility serving the backup generator's role, both to provide backup charging when needed and to run a few specific loads. The home was built with two breaker panels side by side, with the PV system wired between them. The meter pedestal was 150' away at the edge of the street. The array was small at 1.32 kW. Around 2007 the interconnection terms were quite good and we converted this system into a grid-intertied system. Doing this involved replacing the early Outback FX2024 with a GVFX3524. We also had to run an additional #4 conductor from the system (inverter AC interactive output) to the meter pedestal in order to carry interactive sell-back energy to a REC meter, which had to be located next to the revenue meter. We ran this single conductor in 1" PVC conduit with no other conductor. Given that all AC neutrals were properly bonded, that the conduit was non-conductive, and that all metal parts were properly bonded, we didn't run an EGC with this single THWN. We were permitted and and passed inspection. Now we are adding an additional 1.3 kW of PV to the system, which requires full permit process, of course. And in the ensuing years the home has been annexed into the city, with its reputation for toughness in regards to Code compliance. Our design team tells me that we must pull that #4 out and repull it with an EGC, simply because every current-carrying conductor must have a grounding conductor as well. My question: What Code section applies here? Is an EGC always required in conduit carrying a single current-carrying conductor? We're trying to have our ducks in a row before contacting the inspector, and have never dealt with this particular situation before. Thank you, Allan Allan Sindelar A
Certified B CorporationTM
300.3(B) Conductors of the Same Circuit. All conductors of the same circuit and, where used, the grounded conductor and all equipment grounding conductors and bonding conductors shall be contained within the same raceway, auxiliary gutter, cable tray, cablebus assembly, trench, cable, or cord, unless otherwise permitted in accordance with 300.3(B)(1) through (B)(4) [which don't help here]. |
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