HOLT Electricians Practice Exam

What must a switch or circuit breaker do to disconnect the grounded conductor of a circuit?

1. Be manually operated

2. Simultaneously disconnects all conductors

3. Have a safety lock

4. Be located in a wet area

The correct answer is: Simultaneously disconnects all conductors

A switch or circuit breaker must simultaneously disconnect all conductors, including the grounded conductor, to ensure safety and proper operation. This is particularly important in electrical systems to prevent any potential for a shock hazard or electrical fires. By disconnecting all conductors at the same time, the risk of having the grounded conductor remain live while other conductors are disconnected is eliminated. Such an approach adheres to safety standards and practices, which mandate that all parts of a circuit should be isolated to ensure a safe environment for maintenance or repair work. Options that suggest being manually operated, having a safety lock, or being located in a wet area do not inherently guarantee the safe disconnection of the grounded conductor, which is why they do not meet the essential requirement for such electrical devices.