Which classification of fire extinguisher is NOT suitable for electrical fires?

Class A fire extinguishers are designed to handle fires involving ordinary combustible materials such as wood, paper, and cloth. They work by cooling the burning material and are typically equipped to combat fires that do not involve flammable liquids or electrical equipment. When it comes to electrical fires, using water-based or foam extinguishing methods, which are employed in Class A extinguishers, can pose a significant risk. This is because water can conduct electricity, potentially leading to electrical shock or further danger.

On the other hand, Class C fire extinguishers are specifically designed for fires involving electrical equipment, while Class B is intended for flammable liquids, and Class D is used for combustible metals. Therefore, it is crucial to use the correct type of extinguisher based on the nature of the fire to ensure safety and effectiveness in fire suppression.