Q. What are the requirements related to the use of a ground rod for the grounding electrode system, including sizing of the grounding electrode conductor? (Answer based on 2011 NEC.) A. Ground rod electrodes must not be less than 8 ft in length in contact with the earth [250.53(G)]. Rod-type electrodes must have a diameter of at least 5/8 in., unless listed [250.52(A)(5)(b)]. Rod, pipe, or plate electrodes must meet the following requirements [250.53(A)]: 1) If practicable, rod, ...

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