Power cable through a certain load current, will heat, with the increase of load current, the higher the cable surface temperature, if not handled in time, the consequences can be imagined. For example: polyvinyl chloride (PVC) cable, the core temperature is considered as the upper limit of 70 degrees, and the surface temperature will be 5 to 10 degrees lower. Therefore, the cable surface temperature below 60 degrees is basically safe, from the power supply maintenance consideration, of course, the lower the temperature the better.


The reasons for cable heat in operation are as follows:

1. The resistance of the cable conductor does not meet the requirements, resulting in heating of the cable during operation.

2. Improper cable selection, resulting in the use of cable conductor cross-section is too small, the operation of overload phenomenon, after a long time of use, the cable heating and heat dissipation imbalance caused by heating phenomenon.

3. When the cable is installed, the arrangement is too dense, the ventilation and heat dissipation effect is not good, or the cable is too close to other heat sources, which affects the normal heat dissipation of the cable, and may also cause the cable to generate heat during operation

4. The joint manufacturing technology is not good, the crimping is not tight, causing the contact resistance at the joint to be too large, and it will also cause the cable to generate heat

5. The local sheath of armored cable is damaged, which causes slow damage to the insulation performance after water entry, resulting in gradual reduction of insulation resistance, and also causes heat phenomenon during cable operation. After the cable generates heat, if the cause is not found and the fault is removed in time, the cable will produce insulation thermal breakdown after continuous power operation. Cause the cable to meet short circuit tripping phenomenon, serious may cause fire.

Qingdao Tianxing Cable Co., Ltd. is a technology enterprise specializing in the production of wire and cable in Shandong Province, with more than 150 sets of domestic excellent cable production equipment and testing equipment, excellent production technology, modern testing equipment, to ensure stable product quality and timely supply. The company's main products are power cable, mineral cable, high life wire and cable, radiation crosslinked cable, control cable, computer cable, photovoltaic cable, communication cable, data cable, low smoke halogen free cable, flame retardant series wire and cable.