Class I locations are used for hazards involving

Class I locations are used for hazards involving

• A. Gases and vapors
• B. Dusts
• C. Fibers
• D. Liquids

Answer: (A)

Classifying hazardous locations is about the material that can ignite in the atmosphere. Class I locations are areas where flammable gases or vapors may be present in the air in sufficient quantity to form an explosive mixture. That’s why the hazard described involves gases and vapors—the correct concept corresponds to the material type that creates the ignition risk. Dusts fall under Class II, fibers under Class III, and liquids themselves aren’t a separate class; if flammable liquids are present, the ignition hazard is typically from their vapors, which belong to gases or vapors (Class I).

Classifying hazardous locations is about the material that can ignite in the atmosphere. Class I locations are areas where flammable gases or vapors may be present in the air in sufficient quantity to form an explosive mixture. That’s why the hazard described involves gases and vapors—the correct concept corresponds to the material type that creates the ignition risk. Dusts fall under Class II, fibers under Class III, and liquids themselves aren’t a separate class; if flammable liquids are present, the ignition hazard is typically from their vapors, which belong to gases or vapors (Class I).