A separate building or structure is supplied by a feeder from another building. The feeder consists of 3-phase, 4-wire conductors with a 150-ampere overcurrent device. The largest ungrounded feeder conductor is 1/0 AWG copper. What is the minimum size copper grounding electrode conductor required for the separate building, if connected to a driven ground rod?

The correct answer is located in the National Electrical Code Section XXX.XX(Y)(Z). Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

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