Consider a panelboard for a commercial building supplied by a 480Y/277 V, threephase feeder. The panel has the following loads:

• A lighting system of a total power 45 kVA with a power factor of 0.93

• A 15 kVA resistive water heater with a power factor of 1.0

• A motor rated at 10 kVA and a power factor of 0.82 Determine

(a) The size of the molded-case circuit breaker for the water heater. Assume a continuous load.

(b) The size of fuses for the motor. Assume a continuous load.

(c) The size of the power circuit breaker serving the panel.