Which hazard location classification addresses combustible dust?

Which hazard location classification addresses combustible dust?

• A. Class I
• B. Class IV
• C. Class III
• D. Class II

Answer: (D)

Combustible dust hazards are categorized under a specific class that covers dusts capable of ignition when suspended in air. Finely divided dusts, such as flour, sugar, coal, wood, or metal dust, can form an explosive mixture if an ignition source is present. This makes the appropriate label Class II, which is dedicated to combustible dust environments. In contrast, Class I locations involve ignitable gases or vapors, and Class III involves ignitable fibers or flyings that aren’t normally airborne. So, for environments where combustible dust is or can be present, the correct classification is Class II, reflecting the unique ignition risks associated with dust particles.

Combustible dust hazards are categorized under a specific class that covers dusts capable of ignition when suspended in air. Finely divided dusts, such as flour, sugar, coal, wood, or metal dust, can form an explosive mixture if an ignition source is present. This makes the appropriate label Class II, which is dedicated to combustible dust environments.

In contrast, Class I locations involve ignitable gases or vapors, and Class III involves ignitable fibers or flyings that aren’t normally airborne. So, for environments where combustible dust is or can be present, the correct classification is Class II, reflecting the unique ignition risks associated with dust particles.