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E3608.4 Resistance of Rod, Pipe and Plate Electrodes
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A single electrode consisting of a rod, pipe or plate that does not have a resistance to ground of 25 ohms or less shall be augmented by one additional electrode of any of the types specified in Sections E3608.1.2 through E3608.1.6. Where multiple listed electrodes or rod, pipe or plate electrodes are installed to meet the requirements of this section, they shall be not less than 6 feet (1829 mm) apart.