What is the requirement for exposed metal frames of PV modules?

The requirement for exposed metal frames of photovoltaic (PV) modules is that they must be grounded and bonded with devices that are listed and identified for this purpose. Grounding the metal frames serves multiple critical functions, including ensuring safety by reducing the risk of electric shock and preventing damage to the PV system due to lightning strikes or fault conditions. Bonding helps ensure that all metallic components are at the same electrical potential, which further enhances safety by preventing potential differences that could pose a shock hazard.

Grounding and bonding are essential measures to comply with safety standards and electrical codes, which mandate that exposed conductive parts must be connected to an effective grounding system. The use of specifically listed and identified devices ensures that the grounding methods meet necessary performance and safety criteria, which is vital for the protection of both the equipment and personnel working with or around the solar power system. Compliance with these grounding requirements supports safe operation and long-term reliability of PV systems, making it a fundamental aspect of photovoltaic installation practices.