Are devices that bond metallic frames of PV modules permitted to bond exposed metallic module frames to the metal frames of PV modules?

The reason that devices designed to bond metallic frames of photovoltaic (PV) modules are permissible to bond exposed metallic module frames to the metal frames of PV modules lies in the safety and functional requirements of electrical installations. The bonding of these frames is critical for maintaining electrical continuity and minimizing potential differences that could pose hazards, such as electrical shock or increased risk of fire.

Bonding creates a low-resistance path for fault currents, allowing them to flow safely away from the system and into the ground. This is particularly important in PV systems where exposure to environmental elements can lead to corrosion or other mechanical stresses that might compromise electrical connections over time. By ensuring that metallic frames are properly bonded, it helps to prevent dangerous touch potentials that could arise if a malfunction occurs.

The correct answer supports the idea that bonding is an essential practice in maintaining system integrity and safety, especially considering the unique operating conditions present in solar energy systems. Thus, allowing such bonding practices aligns with the overall goals of electrical safety regulation standards.