Quick Answer
NEC code sections 690.43 and 690.53 specifically address grounding of solar arrays. These sections provide requirements for grounding of photovoltaic (PV) arrays, including the use of grounding electrodes and bonding of metal frames to ground.
Understanding NEC Code Section 690.43
NEC code section 690.43 specifies that the grounding of a PV array shall be done at the inverter or at the output of the charge controller. The grounding electrode must be sized to meet the requirements of 250.66, which is 125% of the rating of the inverter or charge controller. For example, for a 10 kW inverter, the grounding electrode would need to be sized to carry at least 12.5 kW of current.
Grounding Electrodes and Bonding Requirements
NEC code section 690.53 requires that the grounding electrode for a PV array be sized to meet the requirements of 250.66, and that it be installed in accordance with the requirements of 250.64. The code also requires that all metal frames and equipment associated with the PV array be bonded to the grounding electrode. This includes metal frames, conduit, and other equipment that could potentially be energized by lightning or a short circuit.
Best Practices for Grounding Solar Arrays
When grounding a solar array, it’s essential to follow the requirements of the NEC and to use best practices to ensure safe and reliable operation. This includes using a grounding electrode that is sized to meet the requirements of 250.66, and bonding all metal frames and equipment to the grounding electrode. Additionally, it’s a good idea to use a grounding system that is designed for use in PV applications, such as a grounding system that includes a lightning arrester or a surge protector.
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