What is a potential ignition source from overloaded wiring?

Resistance heating is a key mechanism that can lead to ignition in the context of overloaded wiring. When electrical current passes through a wire that is carrying more load than it is rated for, the resistance of that wire generates heat. This heat can accumulate and eventually reach a temperature that ignites surrounding materials, particularly in environments where flammable substances may be present.

Overloaded wiring occurs when circuits are subjected to loads that exceed their design specifications, often because of the addition of more devices or appliances than they can handle. As the current flows through the increased resistance caused by overheating, the excessive heat buildup can become a critical factor leading to ignition, particularly in older or poorly maintained wiring systems.

In contrast, cold temperatures do not provide a direct ignition source; they generally reduce the susceptibility of materials to burn. Power surges, while they can contribute to electrical failures, do not directly cause overheating in the same way as continuous overloads do. Short circuits, while a serious electrical hazard, typically result from a fault condition that provides an alternative pathway for the current, often bypassing the normal load and resulting in instant failure rather than a gradual buildup of heat.