What defines an accidental fire?

The correct definition of an accidental fire centers around the concept that it occurs without human intent to ignite it. This means that the fire emerges inadvertently, often resulting from situations that could not be anticipated or controlled by individuals.

In this context, while faulty equipment or acts of nature can contribute to accidental fires, the defining characteristic is the absence of human intention. A fire sparked by faulty equipment falls under the category of accidental due to the unintentional nature of the ignition source, but it doesn't encompass the broader definition provided in the correct answer.

Additionally, fires caused by natural occurrences, such as lightning strikes, are indeed classified as accidental, but they also match the broader criteria that no one purposely set the fire. However, the statement that a fire has "no human involvement" captures the essence of accidents more completely, as it implies that no human action—intentional or not—led to the ignition. Thus, the definition aligns well with the principles of classifying different fire origins.