Which extinguisher types are suitable for Class C fires?

Which extinguisher types are suitable for Class C fires?

• A. Water
• B. Dry chemical
• C. Foam
• D. CO2, dry powder, and/or halon

Answer: (D)

Class C fires involve energized electrical equipment, so the extinguisher chosen must be non-conductive and safe to use on live circuits. Water is out because it can conduct electricity and pose a shock hazard, potentially spreading the fire or injuring the operator. Foam isn’t ideal for energized electrical fires either, as it can retain moisture and still pose conductivity issues, and it’s not specifically designed for electrical scenarios. The effective options are non-conductive agents: CO2, dry chemical (dry powder), and halons. CO2 works by displacing oxygen and suffocating the flame without leaving conductive residues; dry chemical coatings insulate and interrupt the chemical reactions occurring in the flame; halons act by interrupting the chemical reactions in the flame. Because these agents are safe for energized electrical equipment, they’re the appropriate choices for Class C fires, making the combination of CO2, dry powder, and/or halon the best answer.

Class C fires involve energized electrical equipment, so the extinguisher chosen must be non-conductive and safe to use on live circuits. Water is out because it can conduct electricity and pose a shock hazard, potentially spreading the fire or injuring the operator. Foam isn’t ideal for energized electrical fires either, as it can retain moisture and still pose conductivity issues, and it’s not specifically designed for electrical scenarios. The effective options are non-conductive agents: CO2, dry chemical (dry powder), and halons. CO2 works by displacing oxygen and suffocating the flame without leaving conductive residues; dry chemical coatings insulate and interrupt the chemical reactions occurring in the flame; halons act by interrupting the chemical reactions in the flame. Because these agents are safe for energized electrical equipment, they’re the appropriate choices for Class C fires, making the combination of CO2, dry powder, and/or halon the best answer.