Solar Interconnection & the 120% Rule
5:01
Tie a solar breaker into the wrong spot, and you can overload the busbar.
In this lesson: the 120% rule (705.13) with worked examples at 200A, 100A, and 400A scale, breaker position on the bus, the supply-side connection alternative that skips the busbar math entirely, multiple solar breakers and battery backfeed adding together, and the required interconnection labeling.
Based on the 2023 NEC (Article 705).
