Select the size of conductors and conduit for a feeder that services a lighting panel with the following features:

• Load is 275 kW with a power factor of 90% and is continuous.

• More than 50% of the load has high third-harmonic components.

• The panel is supplied by 480Y/277 V, three-phase, and four-wire system.

• The length of the feeder is 250 ft.

• The available fault current is 42,000 A symmetrical.

• The feeder overcurrent protection is a molded-case breaker.

• The maximum allowable voltage drop is 2%.

• Conductors to be type THW copper in steel conduit.