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About UsHongsheng Wire and Cable Co., Ltd. is a key enterprise in Zhejiang Province specializing in the production of wires and cables, integrating industry, commerce, trade, production, education, and research. Its main production, processes, and testing equipment are all designed and configured according to international standards.
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ProductsEmploy scientific management and quality assurance systems based on GB/T19001—IS09001 and GB/T24001—ISO14001 environmental management systems to organize production management.
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Contact UsWe believe: Great achievements depend on quality. Your satisfaction is our eternal pursuit!
06
2022
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05
Let me explain the reasons for power cable heating and the difference between flame-retardant and fire-resistant cables.
Let me explain the reasons for power cable heating and the difference between flame-retardant and fire-resistant cables. Reasons for power cable heating When a certain load current passes through the power cable, it will generate heat. As the load current increases, the surface temperature of the cable will be higher. Therefore, the reasons for power cable heating and how to choose power cables are discussed.
Let's discuss the reasons for power cable heating and the differences between flame-retardant and fire-resistant cables.
Reasons for Power Cable Heating
When a certain load current passes through the power cable, it will generate heat. As the load current increases, the surface temperature of the cable will be higher. So, what are the reasons for power cable heating and how to choose power cables?
Main Reasons for Power Cable Heating Analysis:
1. When planning and designing a communication power supply system, select a power cable whose continuously permissible current is less than the larger continuous current of the load.
2. When the power cable is used as a cold-pressed joint, the mold of the crimping tool is too large, resulting in unstable and unreliable crimping of the copper nose and the cable core.
3. When connecting the input and output ends of the air switch to the copper nose of the cable, non-standard flat washers are used or spring washers are not installed.
4. When connecting the input and output ends of the air switch to the multi-strand hard core of the cable, the bolts of the air switch are not tightened.
5. When the high-power UPS is running, the filter cabinet is not put into use, and the N-th harmonic affects the cable overload and neutral line overload. In severe cases, it may cause cable breakdown and fire hazards.
6. The power cable is laid along the communication building's exterior wall iron cabinet, and the surrounding environment is not ventilated, which has an adverse effect on heat dissipation.
Difference between Flame-Retardant and Fire-Resistant Cables
People often confuse the concepts of flame-retardant and fire-resistant cables. Although flame-retardant cables have many advantages more suitable for chemical enterprises, such as low-halogen, low-smoke flame-retardant, generally speaking, flame-retardant cables can replace flame-retardant cables, but fire-resistant cables cannot.
The two principles are different. The flame-retardant principle of halogen-containing cables relies on the flame-retardant effect of halogens, while the flame-retardant principle of halogen-free cables relies on water precipitation to reduce temperature to extinguish fires. Fire-resistant cables rely on the fire-resistant and heat-resistant characteristics of mica materials in the fire-resistant layer to ensure the normal operation of the cables in case of fire.
Their structure and materials are different. The basic structure of a flame-retardant cable is: the insulation layer is made of flame-retardant material; the sheath and outer protective layer are made of flame-retardant material; the bag and filler are made of flame-retardant material.
Fire-resistant cables usually add a fire-resistant layer between the conductor and the insulation layer, so theoretically, a fire-resistant layer can be added to the structure of a fire-resistant cable to form a flame-retardant and fire-resistant cable, but this is not actually necessary. Due to the fire-resistant layer of the fire-resistant cable, multiple layers of mica tape are usually directly wound around the conductor, which can withstand long-term burning, and even if the polymer at the flame point is burned, the normal operation of the circuit can be ensured.
The main technical indicators related to cable fire safety are the flame retardancy, smoke density, and gas toxicity of CO2 cables. Based on the above factors, the cable flame retardant standard system includes IEC standards, UL standards, etc. Let's take a look at the important grade regulations included.
Okay, I won't explain too much anymore. If you need to purchase cables, you can consult our manufacturer.
Power cable
Guangzhou Baiyun International Airport
2017-09-13
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2017-09-13
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2017-09-13
2021-04-13
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Address: Central Industrial Park, Luqiao District, Taizhou City, Zhejiang Province
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