Which classification is used for locations storing easily ignitable fibers?

Which classification is used for locations storing easily ignitable fibers?

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

Answer: (C)

Class III covers locations where easily ignitable fibers or materials that can produce such fibers are present. The division indicates whether the hazard is present under normal operations or only under abnormal conditions. Storing easily ignitable fibers means the fibers aren’t normally in the air in quantities that could ignite, so the hazard is associated with storage rather than active processing. That places the location in Class III, Division 2. Division 1 would apply if the fibers were being handled or processed and could be in the air during normal operations. The other classifications describe different hazards entirely—gases or vapors in Class I, and combustible dusts in Class II.

Class III covers locations where easily ignitable fibers or materials that can produce such fibers are present. The division indicates whether the hazard is present under normal operations or only under abnormal conditions. Storing easily ignitable fibers means the fibers aren’t normally in the air in quantities that could ignite, so the hazard is associated with storage rather than active processing. That places the location in Class III, Division 2. Division 1 would apply if the fibers were being handled or processed and could be in the air during normal operations. The other classifications describe different hazards entirely—gases or vapors in Class I, and combustible dusts in Class II.