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A transformer, rated 30-kVA, 3-phase, 480-volt primary and a 208/120-volt secondary, is installed with primary and secondary protection where the primary overcurrent protective device is rated 50-amperes. The transformer supplies a 3-phase, 4-wire, 208/120-volt, 100-ampere main circuit breaker panelboard with secondary conductors which are not longer than 10 feet in length. The panelboard supplies 75 amperes of noncontinuous load. What is the minimum size THWN secondary conductors required for compliance with 240.21(C)(2)(4) and 240.21(C)(2)(1)?