A construction trailer office requires a fire extinguisher. For ordinary combustibles like wood and paper, what class of fire extinguisher should be provided?
Correct Answer
C) Class A
Class A fire extinguishers are designed for ordinary combustible materials such as wood, paper, cloth, and most plastics. These are the most common fires in office environments.
Why This Is the Correct Answer
Class A fire extinguishers are specifically designed and rated for ordinary combustible materials such as wood, paper, cloth, rubber, and many plastics. These materials burn with glowing embers and leave ash residue, which is characteristic of Class A fires. In a construction trailer office environment, the primary fire hazards come from paper documents, wooden furniture, fabric materials, and plastic equipment, making Class A the appropriate choice for this application.
Why the Other Options Are Wrong
Option A: Class B
Class B fire extinguishers are designed for flammable liquids such as gasoline, oil, grease, paint, and other petroleum-based products. These fires burn on the surface and do not leave ash residue like ordinary combustibles do.
Option B: Class D
Class C fire extinguishers are designed for energized electrical equipment fires. While electrical fires may occur in an office, the question specifically asks about ordinary combustibles like wood and paper, not electrical hazards.
Option D: Class C
Class D fire extinguishers are designed for combustible metals such as magnesium, titanium, sodium, and lithium. These specialized fires require specific dry powder agents and are not found in typical office environments.
Memory Technique
Use the mnemonic 'Ash, Burning liquids, Current, Dangerous metals' to remember A-B-C-D fire classifications, with Class A being the most common for ordinary office materials.
Reference Hint
Florida Building Code Chapter 9 - Fire Protection Systems, or NFPA 10 Standard for Portable Fire Extinguishers
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