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250.56 Resistance of Rod, Pipe, and Plate Electrodes.
A single electrode consisting of a rod, pipe, or plate that does not have a resistance to ground of 25 ohms

Right on Don. 5/8" x 8' contact area simply can't compete...

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(A) Rod, Pipe, and Plate Electrodes. Where practicable, rod, pipe, and plate electrodes shall be embedded below permanent moisture level. Rod, pipe, and plate electrodes shall be free from nonconductive coatings such as paint or enamel.
interesting obsvervation E~Scott, i never really considered this ( so thank you~!)...... [Linked Image]
again appliable to what seems the least efficent