HOLT Electricians Practice Exam

In addition to overload protection, what must each motor and its accessories require?

1. Voltage regulation

2. Short-circuit and ground-fault protection

3. Surge protection

4. Thermal protection

The correct answer is: Short-circuit and ground-fault protection

Each motor and its accessories must have short-circuit and ground-fault protection in addition to overload protection to ensure comprehensive safety and operational reliability. Overload protection prevents excessive current flow that could overheat and damage the motor during prolonged overcurrent situations. However, short-circuit protection is crucial for safeguarding against the rapid current surges that can occur due to faults, which can cause immediate and severe damage to the motor and its components. Ground-fault protection is important as well, as it detects ground fault conditions that could result in unsafe electrical situations, potentially leading to electric shock hazards or fire. This combination of protections enables a motor to operate safely in various conditions, ensuring that both slow-developing issues like overload and fast-acting faults like short circuits and ground faults are addressed. While voltage regulation, surge protection, and thermal protection are important aspects of motor operation and safety, they do not cover the immediate risks posed by electrical faults as comprehensively as short-circuit and ground-fault protection do.