Which extinguishing media are appropriate for electrical fires (Class C)?

• A. Water is a safe and effective extinguishing medium
• B. Foam is the preferred agent for electrical fires
• C. Carbon dioxide is always used for electrical fires
• D. Non-conductive agents such as CO2 or dry chemical are appropriate for electrical fires

Answer: (D)

When extinguishing an electrical fire, the main concern is avoiding any path for electricity to travel through the extinguishing agent. Water conducts electricity, so using it on energized equipment can cause shock and spread the fault, making the situation more dangerous. Non-conductive extinguishing media, like carbon dioxide or dry chemical powders, don’t conduct electricity and can blanket or interrupt the flame without energizing the surroundings. CO2 displaces oxygen and can suppress the fire in confined spaces, while dry chemical powders coat surfaces and interrupt the chemical reactions happening at the flame, providing effective suppression on energized equipment. This is why non-conductive agents such as CO2 or dry chemical are appropriate for electrical fires. Water-based foams, or water itself, are not suitable because of their conductivity; CO2 is not the only option but is part of the non-conductive choices, and saying it is used “always” would overlook situations where dry chemical is preferred.