Which of the following is not required on a motor nameplate?

• A. Watts
• B. Horsepower
• C. Manufacturer's identification
• D. Voltage

Answer: (A)

On a motor nameplate, the essential information includes the electrical supply details (voltage, current, phase), the mechanical output rating (horsepower), and clear manufacturer identification so you can trace the unit. Watts, or the input electrical power in watts, is not a required field because the nameplate standard uses horsepower as the primary specification for the motor’s output, and the electrical input can be referenced through current and voltage or converted to watts if needed. In short, horsepower communicates what the motor can do, while watts isn’t a mandatory label on the plate.