Which classification pair is used for locations where easily ignitable fibers are stored?

Which classification pair is used for locations where easily ignitable fibers are stored?

• A. Class I, Division 1
• B. Class II, Division 1
• C. Class III, Division 1
• D. Class III, Division 2

Answer: (D)

When a location involves easily ignitable fibers, the category is Class III. The Division indicates whether the ignition hazard is present under normal operations (Division 1) or only under abnormal conditions (Division 2). If fibers are simply stored rather than actively handled or processed, the ignition risk isn’t expected to be present during normal use, so it’s considered Division 2. Therefore, the appropriate classification pair is Class III, Division 2. For reference, Class I covers flammable gases or vapors, and Class II covers combustible dust, which are different hazard scenarios.

When a location involves easily ignitable fibers, the category is Class III. The Division indicates whether the ignition hazard is present under normal operations (Division 1) or only under abnormal conditions (Division 2). If fibers are simply stored rather than actively handled or processed, the ignition risk isn’t expected to be present during normal use, so it’s considered Division 2. Therefore, the appropriate classification pair is Class III, Division 2. For reference, Class I covers flammable gases or vapors, and Class II covers combustible dust, which are different hazard scenarios.