A fire extinguisher rated as Class ABC can be used on which types of fires?
Correct Answer
D) Ordinary combustibles, flammable liquids, and electrical fires
Class ABC fire extinguishers are multi-purpose and can be used on Class A fires (ordinary combustibles), Class B fires (flammable liquids), and Class C fires (electrical equipment).
Why This Is the Correct Answer
Class ABC fire extinguishers are specifically designed as multi-purpose extinguishers that can safely and effectively combat all three major types of fires encountered in construction and building environments. The ABC rating indicates the extinguisher contains a dry chemical agent (typically monoammonium phosphate) that can suppress Class A fires involving ordinary combustibles like wood and paper, Class B fires involving flammable liquids like gasoline and oil, and Class C fires involving energized electrical equipment. This versatility makes ABC extinguishers the most common choice for general building fire protection systems.
Why the Other Options Are Wrong
Option A: Ordinary combustibles only
This option is incorrect because it only mentions ordinary combustibles (Class A fires), which represents just one of the three fire types that ABC extinguishers can handle, ignoring their capability with flammable liquids and electrical fires.
Option B: Flammable liquids only
This option is incorrect because it only mentions flammable liquids (Class B fires), which is just one of the three fire classifications that ABC extinguishers are rated to suppress, excluding ordinary combustibles and electrical fires.
Option C: Electrical fires only
This option is incorrect because it only mentions electrical fires (Class C fires), which represents just one of the three fire types that ABC extinguishers can effectively combat, omitting ordinary combustibles and flammable liquids.
Memory Technique
Think 'ABC = All Basic Categories' - when you see ABC rating, it covers all three basic fire types: A for Ash (ordinary combustibles), B for Boiling liquids (flammable liquids), and C for Current (electrical fires).
Reference Hint
Florida Building Code, Chapter 9 - Fire Protection Systems, or NFPA 10 Standard for Portable Fire Extinguishers
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