Photovoltaic (PV) System
A solar electric system that converts sunlight directly into electricity using semiconductor cells, increasingly common in residential and commercial installations.
Detailed Explanation
NEC Article 690 covers PV system installation requirements. Key requirements include: rapid shutdown systems (690.12), DC and AC disconnect means, proper conductor sizing (using correction factors for temperature on rooftops), equipment grounding, and labeling. The 120% rule (705.12(B)(2)) limits the backfed PV breaker size based on the panel's busbar rating. PV installations are a rapidly growing segment of electrical contracting.
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