NEC Article 690 (Photovoltaic Systems) and NEC Article 250 (Grounding and Bonding) require that all grounding connections be made at a single point to avoid multiple ground paths, which can lead to ground loops or unwanted circulating currents. In an ideal grounding system, there should be only one path to the earth for fault current to flow during faults, while every metallic part of the electrical system should be properly bonded together. When multiple ground rods are used, there is a risk of creating grounding loops, which can cause. With the onset of high photovoltaic (PV) penetration, more utility companies are starting to look at PV plants the same way they would look at other major generators. Operational aspects and influence of a PV plant on the distribution network differ from other conventional generators as follows:. If a PV system includes multiple inverters, each one must be individually connected to the main grounding busbar to ensure proper grounding. Never connect the grounding cables of inverters in series. Figure 2: Example of a faulty. This process involves two distinct but related concepts: system grounding, which provides a reference to earth for the electrical system (stabilizing voltages and assisting in clearing certain faults), and equipment grounding, which bonds all normally non-current-carrying metallic parts to provide. Grounding and bonding are two distinct safety requirements for solar photovoltaic systems. Grounding connects electrical components to Earth at zero voltage potential. The National Electrical Code (NEC) – 690.
