A 480V, multiple motor installations similar to supplies a 5 hp, 10 hp, 30 hp, and 50 hp motor. Sketch the system. Determine the conductor size for each motor tap, the motor controller size, overload rating, motor and controller disconnect rating, time-delay fuse rating, and motor branch circuit conductor size. Also, determine the motor feeder time-delay fuse rating, and motor feeder conductor size.
V = 480, typically 460 V
Hp1 = 5
Hp2 = 10
Hp3 = 50
Find:
Conductor size
Motor controller size
Overload rating
Disconnect ratings
Time-delay fuse rating
Motor branch circuit conductor size
Motor feeder time-delay fuse rating
Motor feeder conductor size