Due to the insulating layer of electrical wires and cables being composed of various combustible materials, there is a possibility of explosion and fire. Once a fire occurs, it can spread rapidly and fiercely, producing a large amount of harmful gases, making extinguishing difficult, and causing significant losses after burning. Therefore, it is crucial to pay great attention to preventing cable fire accidents. Today, we introduce several points that may trigger the ignition of electrical wires and cables:

One: Cable long-term overload operation

Extended overloading operation leads to the cable insulation material operating at temperatures exceeding the allowable temperature for normal heat generation, causing the insulation to age and dry out. This phenomenon of insulation aging and drying typically occurs throughout the entire cable circuit.

Insulation damage leads to a short-circuit fault.

Insulation lead sheath of wire and cable is damaged during installation or mechanically damaged during operation, causing insulation breakdown between cable phases or between lead sheaths. The resulting electrical arc ignites the insulation and external protective material, leading to fire.

Cable Head Ignition

Due to moisture and dirt accumulation on the cable head surface, the porcelain sleeve of the cable head cracked, and the spacing between the leads was too small, resulting in electrical arcing and ignition, causing the surface insulation and lead insulation to burn.

Section 4: Intermediate Junction Box Insulation Breakdown

Cable joint boxes experience oxidation, overheating, and dripping of resin during operation due to loose crimping, poor welding, or inappropriate material selection for the joints. Additionally, the quality of the insulating material filled into the intermediate joint box does not meet the requirements. During the filling process, air pockets, poor sealing, and damage allow moisture to seep in, which can lead to insulation breakdown, short-circuiting, and potential fire due to explosions.