Which of the following is NOT one of the four classes of fire?

The classification of fires is based on the type of fuel that is burning, and there are four primary classes of fire recognized by fire safety organizations:

Class A fires involve ordinary combustibles like wood, paper, cloth, and some plastics. Class B fires are concerned with flammable liquids and gases, such as gasoline, oil, and grease. Class C fires pertain to live electrical equipment and the risks posed by electrical currents.

Class D fires are related to combustible metals, such as magnesium, titanium, and sodium. This classification focuses on specialized materials that require specific extinguishing methods.

In this context, Class E is not recognized as an official category in fire classification systems. Thus, it is not one of the established classes of fire, making it the correct answer. Understanding these classifications is crucial for effective firefighting and safety management, as they dictate the appropriate methods and equipment for extinguishing different types of fires.