One commercial building is supplied with 208/120 volt, 4-wire, three-phase power from another building on the same property and under the same management. The feeder is protected in the first building with a 200 ampere circuit breaker, and the conductors are copper Type THWN run underground in rigid nonmetallic conduit. There are three ungrounded conductors, a neutral conductor, and an equipment grounding conductor. At the second building, the neutral and equipment grounding conductors are required to be: