What is a likely consequence of using the wrong extinguisher for a fire class?

• A. Always safe
• B. Has no effect on safety
• C. Be ineffective and may worsen the fire
• D. Be helpful

Answer: (C)

Extinguishers are designed for specific fire classes, so using the wrong one won’t stop the flames and can make things worse. Each extinguisher uses a different method: some cool the fire, some smother it, some interrupt the chemical reaction, and some displace the oxygen. When the agent isn’t suited to the fuel or energy source, it may fail to remove heat or suppress the fire’s source, and in some cases it can spread burning material or create dangerous conditions (for example, water on an oil fire can splash and flare up, or water on an electrical fire can pose a shock hazard). Because the wrong type doesn’t effectively combat the fire, the likely outcome is that it’s ineffective and may worsen the situation.