New York State Master Electrician Practice Exam

In regards to grounding, what is crucial for equipment in classified locations?

1. It must be located indoors only

2. It must have proper voltage ratings

3. It must show Class, group, temperature class

4. It must be painted for identification

The correct answer is: It must show Class, group, temperature class

The crucial factor for equipment in classified locations regarding grounding is that it must show Class, group, and temperature class. This information is essential because classified locations are those where fire or explosion hazards may exist due to flammable gases, vapors, or dust. The classification of the area affects the selection and installation of electrical equipment to ensure safety. Classifying equipment according to its Class and group ensures it is suitable for specific hazardous environments. This classification helps to define the kind of protection needed to prevent ignition sources in areas where flammable materials might be present. Additionally, knowing the temperature class allows electricians to identify the safe operating temperatures for the equipment, ensuring that it does not exceed limits that could ignite a hazardous atmosphere. While the other choices may pertain to electrical safety and standards, they do not directly address the essential requirement for equipment in classified locations to communicate its classification information clearly, which is vital for compliance and safety in hazardous operational environments.