NEC 250.56 states that a single electrode that does not have a resistance to ground of 25 ohms or less shall be augmented by one additional electrode. (Two electrodes is the maximum required.)
Why do so many consultants specify three rods spaced 10' apart when two electrodes are all that is required per NEC?
Why do so many consultants specify three rods spaced 10' apart when two electrodes are all that is required per NEC?