Portable extinguishers are classified according to what criterion?

Portable extinguishers are classified based on intended use because this classification is crucial for selecting the appropriate extinguisher for different types of fires. Each type of fire requires specific extinguishing agents to effectively suppress it. For example, Class A extinguishers are designed for ordinary combustibles such as wood and paper, while Class B extinguishers are meant for flammable liquids like gasoline and oils. Class C extinguishers are suitable for electrical fires. By understanding the intended use, individuals can make informed decisions about which extinguisher to use in an emergency, ensuring safety and effectiveness.

The other criteria, such as size, weight, and conductivity, while relevant in different contexts, do not define the classification system for portable extinguishers. Size and weight may vary based on the model and design but do not impact the operational capability for specific fire types. Conductivity concerns may relate to electrical safety, but it is not a fundamental criterion for classifying portable extinguishers. Therefore, focusing on intended use provides the most practical and important way to categorize these critical safety tools.