Question: An apartment complex is supplied by a 2 0 8 Y / 1 2 0 - volt, 3 - phase, 4 - wire, wye service.

An apartment complex is supplied by a 208Y/120-volt, 3-phase, 4-wire, wye service. A 3-wire, 208Y/120-volt, 150-ampere feeder supplies a 150-ampere rated panelboard installed in an individual dwelling unit of the apartment building to supply the entire load of the individual unit. The conductors are installed in a location with an ambient temperature of 110F. What is the minimum size THWN-2 ungrounded feeder conductor required to supply the individual dwelling unit?

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