Which extinguisher marking communicates suitability for electrical fires (Class C)?

• A. Green Triangle
• B. Blue Circle with a Letter Designation in the Center
• C. Red Square
• D. Yellow Hexagon

Answer: (B)

Markings on extinguishers are a quick guide to what kinds of fires the extinguisher can safely handle. The blue circle with a central letter is the symbol that communicates suitability for electrical fires (Class C). This designation signals that the extinguisher uses a non-conductive, non-sparking agent appropriate for energized electrical equipment, so you can suppress an electrical fire without risking shock when it’s safe to do so. The other shapes and colors represent different fire types or ratings and do not specifically indicate electrical compatibility, so they aren’t the right cue for Class C fires.