What defines a "working fire" in firefighting terminology?

In firefighting terminology, a "working fire" refers to a situation that requires an active response and engagement by firefighting personnel. This designation indicates that the fire is significant enough to necessitate the deployment of firefighting resources and efforts to suppress it. It implies that the fire is not under control, and firefighters must take immediate action to mitigate the threat to life, property, and the environment.

The term is used to help prioritize the response and mobilization of additional resources, as it directly affects scene safety and operational decision-making. Recognizing a fire as a "working fire" helps to ensure that all necessary precautionary measures are in place, including additional manpower and equipment to effectively combat the flames.

The other options do not accurately reflect the characteristics of a "working fire." For instance, if a fire is contained and poses no threat, it does not warrant the designation of "working" since there is no immediate need for active engagement. Similarly, a small fire that can be extinguished easily does not require a full alarm response and is often managed as a minor incident. Lastly, a fire that has not yet been reported cannot be classified as a "working fire" since the definition relies on the acknowledgment and active engagement of firefighting efforts.