What class of fire includes energized electrical equipment?

• A. Class B
• B. Class C
• C. Class A
• D. Class D

Answer: (B)

Fires involving energized electrical equipment are categorized as Class C. The live electrical energy creates a special hazard—electric shock and arc events—so these fires require a different approach than fires burning ordinary combustibles or flammable liquids. Water is dangerous on energized electrical fires because it conducts electricity, and using it can spread shock or worsen the situation. The safe approach uses non-conductive extinguishing agents, such as carbon dioxide or dry chemical powders, and, when safely possible, the power should be shut off to reduce the risk. After de-energizing, the fire’s classification may shift depending on what is burning, but the presence of energized equipment itself places it in Class C.