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

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

Answer: (A)

Hazard classifications for electrical installations consider the material that could ignite and whether that hazard is normally present or only under abnormal conditions. For easily ignitable fibers, the relevant category is Class III. The division tells how the hazard behaves: Division 1 covers fibers that are easily ignitable and may be airborne during normal operation, while Division 2 covers fibers that are not normally airborne and pose the ignition hazard mainly when the fibers are stored or under abnormal conditions. Since we’re dealing with locations that store easily ignitable fibers rather than fibers actively being dispersed in the air, this situation fits Class III, Division 2. This distinction helps determine the appropriate equipment and protection required for that space.