What happens to an electrical fire when it is de-energized?

When an electrical fire is de-energized, the supply of electricity that is feeding the fire is cut off, which effectively removes the source of ignition. Since electrical fires typically require an ongoing electrical current to maintain combustion, de-energizing the circuit usually allows the fire to go out.

In most cases, the heat generated by the electrical components may still be present momentarily, so some residual smoldering might occur, but the absence of electrical energy means there is no longer a fuel source for the fire to continue burning in the same manner. Hence, when the power is turned off, the fire ceases to sustain itself and is likely to be extinguished.

This understanding emphasizes the importance of quickly de-energizing electrical systems in the event of a fire, as it can dramatically reduce the fire's severity and potentially prevent further hazards.