How many basic classifications of fuel and fire extinguishers exist?

The classification of fire extinguishers is universally recognized to have five basic categories, each designated for different types of fires based on the combustibles involved. These classifications are essential for identifying the appropriate extinguisher to use in a fire situation, ensuring effective and safe fire suppression.

The five classifications are:

1. Class A: For fires involving ordinary combustibles such as wood, paper, and cloth.

2. Class B: For flammable liquids and gases, including gasoline, oil, and solvents.

3. Class C: For electrical fires, where the current is the source of ignition.

4. Class D: For fires involving combustible metals, which require specialized extinguishing agents.

5. Class K: For cooking oils and fats, specifically in commercial kitchens.

Choosing the correct extinguisher type is crucial for safety, as using the wrong type can lead to ineffective fire suppression or even exacerbate the fire. Misconceptions about the number of classifications often stem from varying contexts or local regulations, but the widely accepted standard recognizes these five categories.