How does the National Electrical Code (NEC) address roof-mounted PV systems?

The National Electrical Code (NEC) provides comprehensive guidelines for roof-mounted photovoltaic (PV) systems to ensure safety and effectiveness. The correct choice highlights that the NEC addresses multiple aspects of installation, including the mounting, clearances, and requirements for structural integrity.

Specifically, these guidelines ensure that the PV systems are securely attached to rooftops, which helps prevent damage to both the system and the building. The clearances specified are crucial for maintenance and safety reasons, allowing for adequate airflow and accessibility to the solar panels. Additionally, structural integrity requirements ensure that the roof can support the weight of the equipment, factoring in dynamic loads such as wind and snow.

By providing these detailed guidelines, the NEC ensures that installations are safe, effective, and compliant with building codes, thus promoting the reliable operation of solar energy systems. This approach helps to protect not only the integrity of the PV system but also the overall safety of the building and its occupants.