Electrician's Licensing Practice Exam

What is required for appliances with motors over 0.125 hp?

1. A separate means of disconnect

2. A larger circuit breaker

3. More insulation on wiring

4. Higher voltage rating

The correct answer is: A separate means of disconnect

For appliances with motors that exceed 0.125 hp, a separate means of disconnect is mandated for safety and compliance with electrical codes. This requirement ensures that the motor can be isolated from the power source, allowing for maintenance and repair without the risk of accidental energization. A dedicated disconnect switch enables users to easily turn off the power to the appliance, which is crucial for protecting both the users and the integrity of the electrical system. This provision aligns with safety standards aimed at preventing electrical shocks or fires that may result from motor operations and maintenance. In cases where motors operate at higher capacities, the potential hazards increase, making a separate disconnect even more critical. Therefore, ensuring that there is a way to completely disconnect the machine from its power source is integral to proper electrical safety protocols. Other options, while relevant to electrical systems, do not directly address the specific safety requirements for appliances with motors over 0.125 hp. A larger circuit breaker may be necessary based on the motor's current demand, but it does not substitute the need for a disconnect means. More insulation on wiring or a higher voltage rating might be aspects to consider for different operational parameters but are not specifically mandated for the safe operation and maintenance of motors above that horsepower threshold.