Which of the following is NOT a Primary Fire characteristic?

• A. Grassland fires
• B. All fires in buildings and vehicles not derelict
• C. Any fire attended by five or more pumping appliances
• D. Fires involving casualties or rescues

Answer: (D)

Primary fire characteristics describe the kinds of fires that require a major response because of their nature or scale. Grassland fires are a primary characteristic because they can spread rapidly across open ground and demand quick, coordinated action. Fires in buildings and vehicles that are not derelict are also primary because they threaten occupants and property and typically need a substantial firefighting effort. A fire that is attended by five or more pumping appliances indicates a large-scale incident, which fits the criteria for a primary fire due to the level of resources involved. Fires involving casualties or rescues, while extremely serious, are not used to define a primary fire characteristic; casualty or rescue events are classified differently, focusing on life safety outcomes rather than the fire type or scale alone. Therefore, fires involving casualties or rescues are not a primary fire characteristic.