Which classification of fire includes incidents that cannot be determined?

The classification of fire incidents that cannot be determined is referred to as "Undetermined." This category is used when there is insufficient evidence or information available to ascertain the cause of the fire. It acknowledges that while the fire did occur, its origin and cause remain unclear, often due to the extent of the damage or the lack of witnesses or physical evidence.

Using the term "Undetermined" allows for a more accurate categorization of incidents within statistical reporting and analysis, ensuring that data reflect the realities of fire investigations, where some results will inevitably be inconclusive. This classification is vital in understanding fire safety measures and improves future investigative efforts by acknowledging the limits of current data.