What is the most effective agent used to extinguish a Class C fire?

What is the most effective agent used to extinguish a Class C fire?

• A. Water
• B. CO2
• C. Foam
• D. Dry Chemical

Answer: (B)

For energized electrical fires, the goal is to smother without creating a conductive path or leaving harmful residue. Carbon dioxide is ideal because it blankets the fire, displaces oxygen, and is nonconductive, quickly knocking down the flame without risking current flow or shorting equipment. Water or foam should be avoided on live electrical fires since they can conduct electricity and spread current, increasing danger. Dry chemical can work and is nonconductive, but it leaves a powder residue that can foul contacts and contaminate sensitive gear, making it less desirable than CO2 in most situations. So, carbon dioxide is the most effective agent for Class C fires.

For energized electrical fires, the goal is to smother without creating a conductive path or leaving harmful residue. Carbon dioxide is ideal because it blankets the fire, displaces oxygen, and is nonconductive, quickly knocking down the flame without risking current flow or shorting equipment. Water or foam should be avoided on live electrical fires since they can conduct electricity and spread current, increasing danger. Dry chemical can work and is nonconductive, but it leaves a powder residue that can foul contacts and contaminate sensitive gear, making it less desirable than CO2 in most situations. So, carbon dioxide is the most effective agent for Class C fires.