In which application is the installation of UF cable permitted?

The installation of UF (Underground Feeder) cable is permitted in photovoltaic systems due to the nature of these installations. Photovoltaic systems often require safe and durable wiring that can withstand environmental conditions, especially when installed outdoors. UF cable is designed to be moisture-resistant and can be buried directly in the ground without additional conduit, making it ideal for connecting solar panels to inverters or other components within the system.

In contrast, residential lighting does not typically involve UF cable, as other types of wiring are more suited for that application. Using UF cable exclusively for underground wiring is limiting, as it can also be used in above-ground applications under certain conditions. Commercial buildings may have specific wiring requirements that demand different types of cables better suited for complex electrical systems or increased load demands. Thus, the use of UF cable is most appropriate for photovoltaic systems, ensuring safety and adherence to electrical codes in outdoor applications.