Class C fires involve which condition?

Class C fires involve which condition?

• A. Fires involving energized electrical equipment
• B. Fires involving ordinary combustibles
• C. Fires involving flammable liquids
• D. Fires involving combustible metals

Answer: (A)

Fires involving energized electrical equipment create a hazard because electricity is still present at the fire source. That means the source could be a circuit panel, wiring, switches, motors, or any device that is powered. The combination of fire and live electricity raises the risk of electric shock and arcing, which can travel through the extinguishing agent or equipment. The safest approach is to de-energize the equipment if it can be done safely, and to use extinguishing methods that are non-conductive and effective for electrical fires, such as dry chemical powders or CO2. Water is generally avoided on live electrical fires because it can conduct electricity and create a shock risk, unless you are certain the power is off and there’s no chance of energizing a path to you or other equipment. Fires from ordinary combustibles (wood, paper, textiles) and fires from flammable liquids or combustible metals are classified separately because the fuel and fire behavior differ, which guides the appropriate extinguishing method and safety precautions.

Fires involving energized electrical equipment create a hazard because electricity is still present at the fire source. That means the source could be a circuit panel, wiring, switches, motors, or any device that is powered. The combination of fire and live electricity raises the risk of electric shock and arcing, which can travel through the extinguishing agent or equipment. The safest approach is to de-energize the equipment if it can be done safely, and to use extinguishing methods that are non-conductive and effective for electrical fires, such as dry chemical powders or CO2. Water is generally avoided on live electrical fires because it can conduct electricity and create a shock risk, unless you are certain the power is off and there’s no chance of energizing a path to you or other equipment.

Fires from ordinary combustibles (wood, paper, textiles) and fires from flammable liquids or combustible metals are classified separately because the fuel and fire behavior differ, which guides the appropriate extinguishing method and safety precautions.