HOLT Electricians Practice Exam

What type of protection device must motor feeder conductors have according to Section 430-52?

1. Overload protection

2. Ground-fault protection

3. Short-circuit protection

4. Both ground-fault and short-circuit protection

The correct answer is: Both ground-fault and short-circuit protection

Motor feeder conductors are required to have both ground-fault and short-circuit protection as specified in Section 430-52 of the National Electrical Code (NEC). Ground-fault protection is essential because it safeguards against unintended current flowing to the ground due to insulation failure or contact with conductive materials, which could pose serious shock hazards or fire risks. Short-circuit protection, on the other hand, is critical for safeguarding the equipment and wiring from damage due to excessive current that occurs when a fault condition arises, such as a direct short across the conductors. By having both types of protection in place, the overall safety and reliability of the motor feeder system are enhanced. This dual protection ensures that any abnormal conditions are quickly detected and mitigated, which helps prevent equipment damage, reduce the likelihood of fire, and protect personnel from electric shock. Thus, the requirement for both ground-fault and short-circuit protection aligns with best practices for electrical safety in motor feeder systems.