HOLT Electricians Practice Exam

Are the circuit breakers for Class II locations required to be listed for use?

1. Yes, always

2. No, not needed

3. Only for heavy equipment

4. Only under certain conditions

The correct answer is: Yes, always

In the context of Class II locations, which are areas where combustible dust may be present, it is crucial that the circuit breakers used are specifically designed and approved for those environments. This ensures that they can operate safely and effectively without creating risks such as electrical arcing, overheating, or failure, which could potentially ignite dust particles. Circuit breakers for Class II locations must meet stringent safety standards and undergo testing to be listed by a recognized testing laboratory. Being listed indicates that the equipment has been evaluated and found compliant with the applicable safety standards for the hazardous location. This requirement exists to safeguard both personnel and equipment operating in environments with combustible dust, thereby reducing the risk of explosions or fires. In summary, having circuit breakers that are listed for use in Class II locations is not only a regulatory requirement but also a critical safety measure. Therefore, the assertion that they must always be listed aligns with the safety protocols established in the industry for such hazardous environments.