Which extinguisher class is represented by a Blue Circle?

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

Answer: (B)

The blue circle marks fires involving energized electrical equipment, i.e., Class C. This classification matters because electrical fires require extinguishing methods that are non-conductive and safe for live circuits. The blue circle cue helps quickly identify which extinguisher type to use (typically non-water agents like CO2 or dry chemical) and reinforces the safety step of de-energizing the equipment if it’s safe to do so before applying the extinguisher. The other classes correspond to different fire hazards (ordinary combustibles, flammable liquids, cooking oils), which is why the blue circle is the indicator for Class C.