Which class is designated for locations where combustible vapors are always present?

In the context of hazardous locations, Class I Division I is specifically designated for areas where combustible gases or vapors are consistently present in the air. This classification is important for ensuring safety and compliance with electrical codes when designing and installing equipment in such environments.

Class I Division I includes locations such as refineries, petrochemical plants, and similar facilities where flammable substances can be expected to exist under normal operating conditions. The classification indicates that the risk of an explosive atmosphere is always present, hence necessitating specialized electrical equipment and safety precautions to mitigate potential hazards.

Understanding these classifications helps in choosing the appropriate materials and methods when working in environments with combustible substances, ensuring both safety and compliance with regulatory standards.