On which classes of fires can dry chemicals be used?

Dry chemicals are effective extinguishing agents for a variety of fire classes due to their ability to interrupt the chemical reactions that sustain fire. Specifically, dry chemical extinguishers are highly suitable for Class A, B, and C fires.

Class A fires involve ordinary combustibles such as wood, paper, and textiles. Dry chemicals can be used on these types of fires because they can effectively smother the flames and cool the burning materials.

Class B fires involve flammable liquids like gasoline, oil, and grease. Dry chemicals are particularly effective here, as they can create a barrier between the fuel and the oxygen, effectively choking the fire.

Class C fires are those involving electrical equipment. Using dry chemicals on these fires is safe as they do not conduct electricity, allowing the operator to extinguish the fire without the risk of electrical shock.

Therefore, the correct answer encompasses all three classes—A, B, and C—highlighting the versatility and effectiveness of dry chemicals in fire suppression across various types of fire hazards.