What is a common wiring method for PV source circuits that are exposed to sunlight?

The common wiring method for photovoltaic (PV) source circuits exposed to sunlight is PV wire. This type of wire is specifically designed for solar applications, meaning it has unique properties that make it suitable for external use in solar energy systems. PV wire is constructed with materials that offer excellent resistance to ultraviolet (UV) light, moisture, and temperature fluctuations, helping to ensure durability and longevity in outdoor settings.

PV wire typically consists of flexible, stranded copper conductors, which are coated with a weather-resistant insulation material that prevents degradation from exposure to sunlight and environmental factors. This makes it ideal for running from the solar panels to the inverter or junction box, as it can withstand the rigors of prolonged sun exposure while maintaining electrical conductivity and safety standards.

This is in contrast to other wiring options listed, such as Romex, which is designed for indoor residential wiring and is not suitable for outdoor applications due to its lack of UV resistance. Armored cable may provide some protection but is generally not used in solar applications for the same reasons. USE-2 wire is also suitable for PV applications but is less common for source circuits compared to PV wire, which is the preferred choice due to its specific design for solar energy systems.