120% Rule Busbar Violation Fix: Choose the Right Option
A 120% rule busbar violation occurs when permitted source breaker ratings exceed the busbar allowance under NEC 705.12, commonly used for utility-interactive solar and battery systems. The usual fixes are a documented main-breaker derating, a compliant supply-side connection, a listed power control system, a different panel configuration, or a service-panel upgrade. Key Facts at a […]