Which classification is used for locations that store easily ignitable fibers?

Which classification is used for locations that store easily ignitable fibers?

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

Answer: (A)

Easily ignitable fibers are categorized under Class III because the hazard comes from the fibers themselves, not from gases or dust. The Division part shows whether the hazard is present under normal operation or only under abnormal conditions. For locations where those fibers are simply stored and not normally in the air in quantities that could ignite, Division 2 is the correct designation. If the fibers were routinely airborne in amounts that could ignite during normal operation, Division 1 would apply. In contrast, Class I covers flammable gases or vapors, and Class II covers combustible dust. So storing easily ignitable fibers falls under Class III, Division 2.

Easily ignitable fibers are categorized under Class III because the hazard comes from the fibers themselves, not from gases or dust. The Division part shows whether the hazard is present under normal operation or only under abnormal conditions. For locations where those fibers are simply stored and not normally in the air in quantities that could ignite, Division 2 is the correct designation. If the fibers were routinely airborne in amounts that could ignite during normal operation, Division 1 would apply. In contrast, Class I covers flammable gases or vapors, and Class II covers combustible dust. So storing easily ignitable fibers falls under Class III, Division 2.