Carbon dioxide extinguishers are generally rated for which type of fires?

Carbon dioxide extinguishers are specifically designed to combat different types of fires, particularly those involving flammable liquids and electrical equipment. The correct choice indicates that carbon dioxide extinguishers are rated for Class B and Class C fires.

Class B fires involve flammable liquids such as gasoline, oil, and paints. Carbon dioxide extinguishers work effectively on these fires because they displace oxygen, thereby smothering the flames and preventing re-ignition.

Class C fires pertain to electrically energized equipment. Carbon dioxide extinguishers are also suitable for these fires as they do not conduct electricity, making them a safe choice for extinguishing fires involving electrical appliances, wiring, or equipment.

In contrast, other classes of fires do not fall under the scope of carbon dioxide extinguishers. For example, Class A fires, which involve ordinary combustibles like wood and paper, require extinguishing agents that cool the burning material rather than simply displacing oxygen. Thus, while carbon dioxide extinguishers are versatile, their effectiveness is predominantly in Class B and Class C scenarios.