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=== Install Residential Grounding Rod ===Grounding rods are driven into the earth to a depth of at least 8 feet. If rock is hit at less than 8 feet, the grounding rod can be driven at an angle but the angle cannot exceed 45 degrees. A grounding rod can also be buried on top of rock in a trench that is 2 1/2 feet deep and 8 feet long. Ground clamps hold the ground conductor and the grounding rod together without losing conductivity when exposed to weather and movement.