Which condition must be satisfied for a fire to ignite from electrical failures?

For a fire to ignite from electrical failures, it is essential that the electrical wiring be energized and produce heat. When electrical wiring is operational, it can experience faults or failures that lead to overheating. This heat can raise the temperature of surrounding materials, such as insulation or other combustibles, to their ignition point, ultimately resulting in a fire.

The presence of sufficient heat from the electrical source is crucial because, without it, there would be no energy transfer capable of igniting combustibles. For example, a short circuit or a damaged wire can create resistance, leading to increased heat dissipation. Therefore, without the wiring being energized to produce heat, the potential for ignition is significantly reduced.

While the condition of having combustible materials nearby is important, they do not necessarily need to be in direct contact with the wiring if sufficient heat is present. Similarly, ventilation can affect combustion once a fire has started, and low temperatures can hinder ignition rather than promote it. However, the critical factor remains that the electrical wiring must be energized to generate the heat necessary for ignition to occur.