Which class is identified by a blue circle symbol on an extinguisher?

Which class is identified by a blue circle symbol on an extinguisher?

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

Answer: (A)

Recognizing extinguisher labels by symbol and color helps you pick the right extinguisher fast. A blue circle marks Class C fires, which involve energized electrical equipment. For these fires you want a nonconductive extinguishing agent and, if possible, you should de-energize the equipment before spraying. Water-based extinguishers must be avoided because water conducts electricity and can cause shocks or short circuits. Other symbols use different shapes and colors to identify other fire types: a green triangle for ordinary combustibles, a red square for flammable liquids, and a yellow symbol for combustible metals. So the blue circle specifically indicates electrical fires.

Recognizing extinguisher labels by symbol and color helps you pick the right extinguisher fast. A blue circle marks Class C fires, which involve energized electrical equipment. For these fires you want a nonconductive extinguishing agent and, if possible, you should de-energize the equipment before spraying. Water-based extinguishers must be avoided because water conducts electricity and can cause shocks or short circuits.

Other symbols use different shapes and colors to identify other fire types: a green triangle for ordinary combustibles, a red square for flammable liquids, and a yellow symbol for combustible metals. So the blue circle specifically indicates electrical fires.