Which classified location indicates combustible dust is always present?

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

Answer: (A)

Combustible dust hazards are categorized under Class II locations, and Division 1 means the dust is normally present in the air during regular operation, so the atmosphere is hazardous under normal conditions. That’s why this option indicates combustible dust is always present. The other choices relate to different hazards or conditions: Class I Div 1 is for flammable gases or vapors, Class II Div 2 means dust may be present only under abnormal conditions, and Class III Div 1 pertains to fibers rather than combustible dust in the air.