Question: Determine the minimum size copper grounding electrode conductor (GEC) using the metal in-ground support structure as the grounding electrode for a 3-phase, 4-wire, 480/277-volt service

Determine the minimum size copper grounding electrode conductor (GEC) using the metal in-ground support structure as the grounding electrode for a 3-phase, 4-wire, 480/277-volt service using three parallel 400 kcmil THWN copper service conductors per phase and neutral

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