Q. What are the Code requirements for sizing the grounding electrode conductor (GEC) at a service to a rod type electrode and concrete-encased electrodes?
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A. Metal underground water pipe electrodes and metal in-ground support structures must be sized in accordance with Table 250.66. Other electrodes such as ground rods, concrete-encased electrodes, and ground rings can be sized using Sec. 250.66(A) through (C).