Wire and cable is closely related to people's production and life, its safe operation is not only related to the normal operation of the power system, but also related to the safety of people's lives and property. The cable will heat up when it passes through a certain load current. With the increase of load current, the cable surface temperature will be higher. If it is not handled in time, it may cause fire accidents and threaten life safety.

The cable has a maximum operating temperature and rated load current when working. For example, polyvinyl chloride (PVC) type cables, the highest temperature reached by the core is 70 ° C, but the surface temperature will be 5 to 10 degrees lower. Therefore, the surface temperature of the cable should not exceed 60 ° C.

What are the reasons why cables overheat during work?

1, the power is too large, the cable overload operation, with the increase of current, the temperature becomes high heat.

2, the cable quality is not qualified, the conductor resistance does not meet the requirements, causing heat phenomenon when the cable is running.

3, the cable is not installed in accordance with the regulations, placed too dense, poor ventilation and heat dissipation, or the cable is too close to other heat sources, affecting the normal heat dissipation function.

4, improper cable selection, resulting in the cross-sectional area of the conductor of the cable is too small, the work is prone to overload phenomenon, after a long time of use, the cable heating and heat dissipation imbalance caused by heating phenomenon.

5, the cable insulation function is not good, the insulation resistance is small, the cable will also cause heat in the work.

6. The sheath of some armored cables is damaged, and the insulation is damaged after the water enters, so that the insulation resistance is reduced, resulting in heating of the cables during the work.

After the cable is heated, if the cause is not found in time to eliminate the hidden danger, the insulation will be overheated and broken down after the cable is continuously connected, resulting in a short circuit or trip of the cable, and in serious cases, it may cause a fire. So in addition to timely troubleshooting, how should we prevent and avoid overheating?

Methods to prevent cables from overheating:

1. When selecting cables, select cables that can meet the heating requirements of the rated load under normal power consumption. When the rated load is exceeded, the cables can run normally for a certain period of time to avoid overheating.

2. Lay cables according to the cable installation regulations, keep enough space for heat dissipation, and keep away from other heat sources.

3, choose a reputation, quality assurance, in accordance with the national regulations of the production of fire retardant national standard cable, such as Shenzhen Chengtai cable, a focus on the production of national standard wire and cable products manufacturers.

4. Periodically check the temperature and humidity of cables and replace old and damaged cables.

5, do not accumulate debris around the cable, keep the overall cable clean and ventilated.

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.

Disclaimer: The views expressed are those of the author