How deep should grounding electrodes be buried? Grounding electrodes should be buried below the permanent moisture level in the earth. The most common type, a grounding rod, must be at least 3/8 inch in diameter and 8 feet in length when buried. 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. Grounding connects electrical components to Earth at zero voltage potential. Most solar. The depth of photovoltaic bracket installations directly impacts system stability, wind resistance, and long-term ROI.