Figure 3-6. - Grounding procedure.
5. After the rod(s) have been driven into the ground, remove the driving stud and the top coupling.
NOTE: The National Electrical Code states that a single electrode consisting of a rod, pipe, or plate that does not have a resistance to ground of 25 ohms or less will be augmented by additional electrodes. Where multiple rod, pipe, or plate electrodes are installed to meet the requirements, they will be not less than 6 feet apart.
The resistance of a ground electrode is determined primarily by the earth surrounding the electrode. The diameter of the rod has only a negligible effect on the resistance of a ground. The resistance of the soil is dependent upon the moisture content. Electrodes should be long enough to penetrate a relativelyContinue Reading