In a rating of 1-A:5-B:C, what does the "B" rating indicate?

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Multiple Choice

In a rating of 1-A:5-B:C, what does the "B" rating indicate?

In extinguishing-class ratings, each letter represents a fire type the extinguisher is effective against. The B rating specifically signals capability against fires involving flammable liquids, such as gasoline, oils, and solvents. In a rating like 1-A:5-B:C, the B portion shows this fire type, with the number indicating the extinguisher’s tested capacity for a liquid-fire scenario. Kitchen oils fall under flammable liquids, so they’re covered by the B category. The A portion addresses ordinary combustibles (solids), and the C portion indicates electrical fires (nonconductive). So the B rating means it’s designated for flammable-liquid fires, not electrical fires or solids.

In extinguishing-class ratings, each letter represents a fire type the extinguisher is effective against. The B rating specifically signals capability against fires involving flammable liquids, such as gasoline, oils, and solvents. In a rating like 1-A:5-B:C, the B portion shows this fire type, with the number indicating the extinguisher’s tested capacity for a liquid-fire scenario. Kitchen oils fall under flammable liquids, so they’re covered by the B category. The A portion addresses ordinary combustibles (solids), and the C portion indicates electrical fires (nonconductive). So the B rating means it’s designated for flammable-liquid fires, not electrical fires or solids.

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