The four classes of combustibles, commonly referred to in fire safety, are:
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Class A: Ordinary combustibles like wood, paper, and cloth.
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Class B: Flammable liquids and gases, such as gasoline and oils.
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Class C: Electrical fires involving energized electrical equipment.
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Class D: Combustible metals, such as magnesium and sodium, which require specialized extinguishing agents.
Each class requires different methods for effective firefighting.
