Quick Answer
The NEC Code requires grounding to protect people and equipment from electrical shock. Grounding requirements include connecting metal equipment to the ground, using grounding electrodes, and ensuring adequate grounding conductors. Grounding systems must be properly sized and installed to prevent electrical shock.
Grounding Requirements for Solar Systems
The National Electric Code (NEC) requires that solar systems be grounded to protect people and equipment from electrical shock. The NEC specifies that the grounding system for a solar system must be connected to the grounding electrode system of the building or structure. This is typically done by connecting the grounding electrode conductor to the grounding electrode system at a grounding point, such as a grounding rod or plate.
Grounding Electrodes and Electrode Spacing
For a single-family dwelling, the NEC requires that the grounding electrode be installed within 6 feet of the building or structure. For larger structures, such as commercial buildings, the electrode can be installed up to 25 feet away from the building. The spacing between grounding electrodes is also specified by the NEC, with a maximum spacing of 25 feet between electrodes. It’s also worth noting that grounding electrodes can be installed in a variety of materials, including copper pipes, steel pipes, and rebar.
Bonding Requirements for Metal Equipment
All metal equipment, including solar panels, inverters, and mounting hardware, must be bonded to the grounding system to ensure that electrical current can flow to ground in the event of a fault. The bonding conductor must be sized according to the NEC, with a minimum size of 6 AWG for systems up to 120 volts, and 4 AWG for systems above 120 volts. The bonding conductor must also be connected to the grounding electrode at a grounding point, such as a grounding rod or plate.
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