To this point, installers have been making supply-side connections in PV systems following the Code to the best of their ability. But with some admittedly vague rules around a few key issues, we wanted to address supply-side connections here.
The National Electric Code allows for a few different ways to interconnect PV systems to utility systems. In two editions of Code Corner, Ryan Mayfield with Mayfield Renewables, explains busbar, load side interconnections in 705.12 (B) (3) (1) and (2), and then supply side connections in 705.11 (C) and (D).
This article highlights the key codes and some of the top sections contractors working with solar PV and battery storage should be familiar with. The most common code system designers, installers, and inspectors refer to for PV and ESS systems are NFPA 70, or the National Electrical Code ( NEC ).
Yes, a solar PV system can be connected using supply side connections even if the panel lacks a main breaker. This involves installing a dedicated disconnect on the supply side of the service equipment, ensuring safe and direct integration with the utility’s supply without overloading the internal panel infrastructure.
b) The AC side of the PV system (between the inverter and the utility meter) meets the utility's safety requirements (labeling, location of equipment, connection to electric panel). c) The power and energy generated meet net metering program requirements.
A PV system is an additional source of supply, so both the mains supply and the PV supply must be securely isolated before electrical work is performed on the installation.