Which class of fire does not include fires caused by electrical equipment?

The reasoning behind why Class A does not include fires caused by electrical equipment lies in the classification system for fire types. Class A fires are primarily those that involve ordinary combustibles such as wood, paper, cloth, rubber, and various plastics. These materials are solid and can burn when ignited, leading to the common fire scenarios that fall under this category.

In contrast, Class C fires are specifically identified as being caused by energized electrical equipment like wiring, circuit breakers, or appliances. The unique characteristic of Class C is that these types of fires can pose a risk of electric shock, and thus the appropriate extinguishing agents must be used to safely combat them without causing further hazards.

Class K fires pertain to cooking oils and fats, typically found in commercial kitchens, while Class D fires deal with combustible metals like magnesium, titanium, or sodium. Each class is formulated to address the specific properties and behaviors of the materials involved in the fire, distinguishing them from one another.

Therefore, Class A, focusing on ordinary combustibles, indeed does not include fires resulting from electrical equipment, which is categorized under Class C. This understanding highlights the importance of accurately identifying fire class types for effective fire safety and management strategies.