Wire and cable burning is one of the factors that cause fires, and in many cases accounts for a large proportion, many people do not understand why the cable can be seen everywhere in life can cause fires. Next, let's learn why wires and cables burn.

First, we need to understand the structure of the cable

Wire and cable are generally composed of conductors, insulating layers and protective layers (shielding, armor, sheath), mainly to transmit electrical energy, information energy and electromagnetic energy conversion. Electrical energy and electromagnetic conversion, because this is the main reason for wire and cable combustion, because electrical energy and electromagnetic energy will generate heat, and heat is the main source of combustion.

Cause of fire of wire and cable

1. Overload operation

Wire and cable in the case of overload operation, more than the rated current of the wire and cable, because the current is too large, the conductor will generate heat energy, so that the insulation and protective layer will have a certain temperature, thereby melting the insulation and protective layer, resulting in short circuit, resulting in fire. When the heat makes the temperature of the wire exceed 250 ° C, the rubber or plastic insulation layer of the wire will directly burn, because of the insulation layer and the protective layer material, the fire will spread, so as to contact the combustible fire.

2. Short Circuit

Wire and cable short circuit will produce a large current, that is, short circuit current, that is, the current does not pass through the electrical equipment in the line, and directly form a loop, the current will increase sharply, the more heat generated, the wire will produce a temperature of up to thousands of degrees Celsius in a very short time, enough to ignite nearby flammable materials, causing a fire.

3. Wire and cable quality problems

Wire and cable non-national standard: Non-standard cables often appear: wire diameter is not up to standard and the resistance value is too large, and both of these situations will cause overload, resulting in fire.

Wire and cable aging: wire and cable have a service life, when the cable reaches the service life or reach the service life in advance because of sunshine or other environmental factors, it will cause cable aging, so that the cable can not reach the inherent performance, resulting in danger, resulting in overload or short circuit, causing fire.

External mechanical damage: wire and cable due to external mechanical damage damage insulation and protective layer, so that insulation and protective layer lost effect, affected by external factors will occur fire, not only fire, by external mechanical damage of the cable, the same will occur electric shock hazard.

Characteristics of wire and cable fires

The temperature of the fire is generally 800-1000 ° C, such a temperature will quickly burn the insulation and protective layer, so that the wire loses the insulation ability, and then cause secondary electrical accidents such as short circuit, causing greater danger.


Summary: When we choose the wire, for different power appliances need to choose the corresponding cable, be sure to choose the national standard cable. If you find that the wire is hot or even hot in your life, you should immediately stop using and replace the wire to avoid danger and loss.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable. Hotline: 16678668098