Carbon dioxide extinguishers are rated for which two classes?

Carbon dioxide extinguishers are rated for which two classes?

• A. A and B
• B. B and C
• C. C and D
• D. A and D

Answer: (B)

The main idea is that extinguisher ratings match the fire types they’re effective against. Carbon dioxide extinguishers work by displacing the air and smothering the fire, which is ideal for flammable liquids and energized electrical equipment. That makes them suitable for Class B fires (flammable liquids) and Class C fires (electrical). They aren’t effective for ordinary solid fuels like wood or paper because they don’t provide enough cooling to prevent reignition, and they aren’t used for metal fires. So, the two classes are Class B and Class C.

The main idea is that extinguisher ratings match the fire types they’re effective against. Carbon dioxide extinguishers work by displacing the air and smothering the fire, which is ideal for flammable liquids and energized electrical equipment. That makes them suitable for Class B fires (flammable liquids) and Class C fires (electrical). They aren’t effective for ordinary solid fuels like wood or paper because they don’t provide enough cooling to prevent reignition, and they aren’t used for metal fires. So, the two classes are Class B and Class C.