HOLT Electricians Practice Exam

Feeder conductors supplying motors must have overcurrent protection against which type of faults?

1. Ground-fault only

2. Overload only

3. Short-circuit only

4. All of the above

The correct answer is: All of the above

Feeder conductors supplying motors need overcurrent protection to guard against various types of faults, including ground faults, overloads, and short-circuits. Overcurrent protection serves to prevent damage to the conductors and the connected equipment by ensuring that excessive currents do not flow. Ground-fault protection is crucial because it detects unintended paths through which current can flow to the ground, which can lead to equipment damage and safety hazards. Overload protection is necessary to handle situations where the motor operates beyond its rated capacity for an extended period, potentially causing overheating and failure. Short-circuit protection is vital to react rapidly to sudden faults that cause a dramatic increase in current, which can cause immediate and serious damage to motors and conductors. By addressing all types of faults, overcurrent protection ensures comprehensive safeguarding for the feeder conductors and maintains safe and reliable operation of the motor systems. This is why the choice that encompasses all forms of potential overcurrent faults is the correct answer.