Is Grounding Equipment for Solar Systems Compatible with Other Electrical?

Understanding Solar Grounding Requirements

Grounding equipment for solar systems requires compliance with the National Electric Code (NEC) 2017 Article 250 and IEEE 1547-2018 standards. A minimum of two grounding paths are recommended, one to the main electrical panel ground and another to a dedicated grounding rod. The grounding rod should be a minimum 8-foot long, 8-foot deep, and 1/2-inch diameter rod driven into the earth. Ensure the grounding rod is connected to the main electrical panel ground with a 6 AWG or larger grounding conductor.

Bonding the Solar Array Ground

To ensure compatibility with other electrical gear, the solar array ground must be properly bonded to the main electrical panel ground. This involves connecting the solar array ground to a grounding busbar in the main electrical panel with a 6 AWG or larger grounding conductor. The grounding busbar should be sized according to the NEC Table 250.66 and should be connected to the main electrical panel ground with a minimum 6 AWG grounding conductor. A bonded grounding ring is also recommended to connect all grounding points, including the solar array ground, main electrical panel ground, and any other grounding points.

Testing and Verification

To ensure the grounding equipment is properly installed, it’s essential to perform a visual inspection, continuity testing, and a voltage drop test. Continuity testing should be performed between all grounding points, including the solar array ground, main electrical panel ground, and any other grounding points. A voltage drop test should be performed between the solar array ground and the main electrical panel ground to ensure a minimum of 95% continuity.