Electrical fire: direct contact between live and neutral wires causes instant resistance drop and current surge
Safety dimension: The "Four Major Causes" of Electrical Fire
In the safety management and hazard inspection of electrical heating equipment, the causes of electrical fires are usually categorized into four types. Understanding these four points is crucial for preventing electrical heating accidents:
Short circuit
Phenomenon: Direct contact between live and neutral wires, instant resistance drop, and current surge.
Consequence: Generates high-temperature arc, instantly melts the insulation layer, igniting surrounding combustibles.
Overload
Phenomenon: The current passing through the wire exceeds its safe current-carrying capacity (e.g., too many high-power electric heaters plugged into a power strip).
Consequence: Continuous heating of the wire accelerates insulation aging or even causes combustion.
Excessive contact resistance
Phenomenon: Loose, oxidized, or poor contact at wire connections (e.g., plug not fully inserted).
Consequence: Local high temperature at the contact point forms a "hot spot", igniting surrounding items.
Leakage
Phenomenon: Insulation layer damage, current flows to ground or equipment casing.
Consequence: Sparks or local high temperature caused by leakage current may lead to fire, and also threaten personal safety.
