Which type of fire extinguisher would be suitable for both Class B and Class C fires?

The appropriate choice for addressing both Class B and Class C fires is a multipurpose dry chemical fire extinguisher. This type of extinguisher contains a dry chemical agent that can effectively extinguish fires involving flammable liquids (Class B) such as gasoline or oils, as well as fires involving electrical equipment (Class C), which can occur in environments with electrical hazards.

Multipurpose dry chemical extinguishers typically use agents such as monoammonium phosphate, which works by smothering the fire and interrupting the chemical reaction that sustains combustion. This ability to tackle both types of fires makes it a versatile tool for firefighting in various situations.

In contrast, water type extinguishers are not suitable for Class B and Class C fires, as using water on flammable liquids can spread the fire, and water is a conductor of electricity, posing a risk when used on electrical fires. Foam agents are effective for Class B fires but not recommended for Class C because they can also conduct electricity. Wet chemical extinguishers are primarily designed for Class K fires, which relate to cooking oils and fats, and are not appropriate for Class B or Class C fires.