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What are the reasons for overheating of wires and cables during use?
Release Time：
2024-04-03
When wires and cables are powered on, the metal core will heat up. As the power on time increases, the surface temperature of the wires and cables will become higher and higher. If not handled in a timely manner, the consequences can be imagined. The PVC wires and cables we commonly use have a PVC sheath, which is considered based on the upper limit of the core temperature of 70 degrees, and the surface temperature will be 5-10 degrees lower. So it is fundamentally safe for the surface temperature of the cable to be below 60 degrees. From the perspective of power maintenance, of course, the lower the temperature, the better.
When wires and cables are powered on, the metal core will heat up. As the power on time increases, the surface temperature of the wires and cables will become higher and higher. If not handled in a timely manner, the consequences can be imagined. The PVC wires and cables we commonly use have a PVC sheath, which is considered based on the upper limit of the core temperature of 70 degrees, and the surface temperature will be 5-10 degrees lower. So it is fundamentally safe for the surface temperature of the cable to be below 60 degrees. From the perspective of power maintenance, of course, the lower the temperature, the better.
It is normal for wires and cables to overheat, but there are some conditions that can cause wires and cables to overheat. Today, the Pearl River Cable Editor will talk about the causes of overheat of wires and cables in use.
1、 Reasons for overheating of wires and cables during use
1. The wire and cable are not tightly crimped at the joint, resulting in excessive resistance at the joint. Prolonged power on may cause the wire and cable to overheat;
2. Inadequate consideration was given in the design, planning, and installation of wires and cables, resulting in the selection of wires and cables that do not match the conductor resistance of the cable. When the energized current exceeds this large negative current, overheating may occur;
3. Improper selection of cable type can cause the conductor cross-section of the used cable to be too small, resulting in overload during transportation. After long-term use, the uneven heating and heat dissipation of the cable can cause overheating;
4. Due to the lack of professionalism of the installation personnel, the arrangement of cables during installation is too dense, resulting in poor ventilation and heat dissipation, or the cables are too close to other heat sources, which affects the normal heat dissipation of the cables and may also cause overheating during operation;
5. The poor insulation performance between cables results in low insulation resistance and overheating during transportation;
6. Partial damage to the sheath of armored cables can cause slow damage to the insulation performance after water ingress, resulting in a gradual decrease in insulation resistance and overheating during cable operation;
7. Many low-quality wires and cables on the market have poor insulation, leading to a decrease in insulation resistance and overheating during long-term operation;
8. Improper selection of wire and cable models, such as choosing fire-resistant wires and cables in high temperature or flammable environments.
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