Which class is used for energized electrical equipment?

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

Answer: (C)

Class C is used for energized electrical equipment. When electrical gear is live, you need an extinguisher that has a non-conductive extinguishing agent, so it won’t carry electricity and pose a shock hazard. Fire extinguishers rated for Class C contain agents like dry chemical powders or CO2 that can safely interrupt the fire without creating an electrical path. Water-based approaches would conduct electricity and could worsen the situation, so they’re avoided on energized electrical fires. If possible, shut off the power first, then use an extinguisher appropriate for the materials involved and with a Class C rating to treat the electrical fire.