A 208Y/120 V panelboard for an office building has the following loads:

• Receptacles with a total load of 50.00 kVA and a power factor of 0.90

• Lighting with a total load of 80.00 kVA and a power factor of 0.95

• One 20-HP motor with an efficiency of 0.90 and a power factor of 0.92

• Heaters with a total load 25.00 kVA and a power factor of 1.00

(a) Determine the size of the THW-feeder for the panelboard. Size the conduit.

(b) Select the proper circuit breaker for the panelboard. The motor is protected by a circuit breaker with an inverse time-delay element.

(c) Size the equipment grounding conductor (Cu) for the panelboard.