Which class is not part of the standard fire classes?

• A. Class E
• B. Class B
• C. Class A
• D. Class C

Answer: (A)

Understanding fire class labels helps you match the extinguisher and approach to the fire type. In standard classifications used today, the common categories are Class A for ordinary combustibles, Class B for flammable liquids, Class C for energized electrical equipment, Class D for metals, and Class K for cooking oils. Class E isn’t part of this standard set. Some older or alternative schemes used E to denote electrical fires, but the current widely adopted practice uses Class C for electrical fires. So the label that isn’t part of the standard lineup is Class E.