Which of the following is NOT a classification of fire cause?

The classification of fire causes typically includes categories such as accidental, natural, deliberate, and undetermined. Each of these classifications helps investigators determine how a fire started and any potential contributing factors.

Accidental fires are those that occur without intention, often due to negligence, equipment failure, or unexpected events. Natural fires may result from phenomena like lightning strikes or wildfires caused by natural occurrences. Undetermined refers to situations where the cause of the fire cannot be conclusively established due to lack of evidence or other complexities.

The classification of deliberate fires includes those set intentionally, often referred to as arson. This designation is crucial in understanding the motivations behind certain fires but is not categorized as a standalone classification in some contexts, as it's often encompassed within the broader definition of incendiary fires.

Thus, identifying "deliberate" as the incorrect option stems from the context that it might not be recognized as a distinct classification of fire cause in certain frameworks, making it less fitting compared to the established categories of accidental, natural, and undetermined.