Which type of fire extinguisher is recommended for both Class A and B fires after shutting off the electrical equipment?

The multi-purpose dry chemical extinguisher is a versatile option effective against both Class A and Class B fires. Class A fires involve ordinary combustibles like wood, paper, and cloth, while Class B fires pertain to flammable liquids such as gasoline, oil, and solvents. When you turn off the electrical equipment, it is safe to use this type of extinguisher, as it can smother flames and prevent re-ignition.

This extinguisher works by discharging a fine powder that interrupts the chemical reaction of the fire. Its capability to handle both fire classes makes it a go-to choice in many fire safety situations where a combination of materials may be involved. It is crucial to recognize the need to turn off electrical equipment before using a water-based solution or certain foam extinguishers, as they may conduct electricity and pose additional hazards.

In comparison, water-type extinguishers are primarily suitable for Class A fires and can be dangerous around electrical fires. Class C extinguishers are specifically designed for electrical fires and are not effective against Class A fires. Foam extinguishers can address Class B fires but typically are not designed for Class A fires, and their use may also be restricted around live electrical sources. Thus, the multi-purpose