UPS Industrial Maintenance Mechanic Practice Test

Reading a three-phase motor nameplate focuses on the electrical and power output data you need to match the motor to the system. The voltage rating tells you the exact supply voltage the motor is designed to run on; using a different voltage can cause overheating, reduced torque, or insulation damage. The full-load current is the current the motor draws at rated load, and it’s what you use to size conductors, fuses or breakers, and the drive or starter that will safely supply the motor. The horsepower (HP) or kilowatts (kW) shows the motor’s mechanical power capability, which relates to the torque the motor can deliver at a given speed and whether it can handle the load you intend to drive. Other data on nameplates, like RPM, frame size, or enclosure type, are useful for installation and mechanical fit, but they don’t determine electrical compatibility or the basic ability of the motor to meet the load. Efficiency and service factor matter for running cost and heat, but the three listed specifications are the essential starting point for proper selection and safe operation.