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25-01-2024
Engineering

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A 75 hp synchronous motor is connected to a 480 volt three phase feeder. The conductors are to be copper with type THW2 insulation. The nameplate lists a running current of 74 amperes, a NEMA code letter B, and a service factor of 1.00. The motor is to operate at unity, or 100% power factor. The motor circuit is protected by dual element time delay fuses. Determine the conductor size, overload heater size using the chart shown in Figure 34-8, NEMA and IEC starter sizes, and the fuse size for this motor installation

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