Which type of conductor is generally considered better for exposed PV source circuits?

In photovoltaic (PV) systems, the choice of conductor for exposed PV source circuits is critical for ensuring safety and performance. PV wire is specifically designed for use in solar applications, making it the most suitable choice for exposed circuits.

PV wire is manufactured to withstand the harsh environmental conditions typically encountered in solar installations, such as UV exposure, high temperatures, and moisture. Its insulation is made from materials that are resistant to degradation, ensuring long-term reliability and safety in exposed locations. Additionally, PV wire is durable, flexible, and capable of maintaining its performance over the lifespan of the solar system, which can extend for several decades.

Other types of wire, such as USE-2 wire, while also suited for certain applications in PV systems, may not possess the same level of protection against environmental factors as PV wire. Romex is generally not appropriate for exposed PV source circuits due to its limitations in outdoor applications and susceptibility to environmental damage. GVF cable is not a standard designation within the solar industry, and its appropriateness for exposed circuits would likely be less established than PV wire.

Thus, the specific construction and intended use of PV wire make it the optimal conductor choice for ensuring the safety and efficiency of exposed PV source circuits.