HOLT Electricians Practice Exam

Which term describes the maximum percentage of motor full-load current that overload devices must not exceed for continuous duty motors?

1. Full Load Current

2. Set Trip Current

3. Rated Current

4. Emergency Trip Current

The correct answer is: Set Trip Current

The term that describes the maximum percentage of motor full-load current that overload devices must not exceed for continuous duty motors is known as Set Trip Current. This term refers to a specific threshold that, when reached, will trigger the overload protection device to disconnect the motor from the power supply to prevent overheating and potential damage to the motor. In the context of continuous duty motors, it is essential for overload devices to accurately monitor the current flow. The Set Trip Current ensures that the motor operates within safe limits by preventing currents beyond the specified percentage of full-load current. This is vital for maintaining the longevity and efficiency of the motor while ensuring safe operation. Other terms, such as Full Load Current, generally refer to the current drawn by a motor at its full capacity under normal operating conditions, without accounting for overloads. Rated Current indicates the maximum current that the motor is designed to handle, but does not specify the protective limits like Set Trip Current does. Emergency Trip Current typically refers to a situation in which an immediate disconnection is needed in case of a severe fault or emergency, rather than the continuous operational limits seen with overload protection. Thus, understanding the distinction and application of Set Trip Current is crucial for electrical safety and the proper functioning of motor systems.