406.4(C): "The equipment grounding conductor contacts of receptacles shall be connected ... He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the ...

Determine the feeder conductor size by the larger of Sec. 215.2(A)(1) or (2) [Sec. 215.2(A)]. In this case, based on the conditions specified in this example, 4/0 AWG is the minimum size conductor.