What are Class III locations primarily characterized by?

Class III locations are primarily characterized by the presence of ignitable fibers or flyings. This classification applies to areas where easily ignitable materials such as dust or lint may be suspended in the air, posing a fire hazard if ignited by electrical equipment. Common examples can include places like textile mills or woodworking shops, where these materials can accumulate and create a risk.

Ignitable fibers or flyings represent a significant concern in these locations, as they can lead to a fire if they come into contact with an ignition source. The National Electrical Code (NEC) establishes these classifications to ensure that electrical installations in these types of environments are appropriately designed and safeguarded against potential ignition risks associated with the materials present.

In contrast, other environments characterized by flammable gases, explosive substances, or liquid combustibles relate to different classifications—Class I and Class II respectively—so they are not indicative of Class III locations.