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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!
04
2022
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08
Some common sense about mineral cables, explained by a wire manufacturer
Wire manufacturers believe that mineral-insulated cables are the main fire-resistant cables that ensure power transmission in modern building projects, suitable for power supply lines such as fire protection power supply, uninterruptible power supply, and emergency lighting power supply. Wire manufacturers believe that mineral-insulated cables are composed of copper cores, mineral insulation materials, and copper metal sheaths. They not only have good conductivity, mechanical and physical properties, and fire resistance, but also good incombustibility. Under fire conditions, this type of cable can ensure the use of electricity for fire protection during the fire, and will not delay the fire or produce smoke. Therefore, the specifications allow this type of cable to be directly exposed.
Wire manufacturers believe that mineral-insulated cables are the main fire-resistant cables that ensure power transmission in modern building projects, suitable for power supply lines such as fire protection power supplies, uninterruptible power supplies, and emergency lighting power supplies.
Wire manufacturers believe that mineral-insulated cables consist of copper cores, mineral insulation materials, and copper metal sheaths. They not only have good conductivity, mechanical and physical properties, and fire resistance, but also good incombustibility. Under fire conditions, this cable can ensure the use of electricity for fire protection during the fire, and will not delay the fire or produce smoke. Therefore, regulations allow this cable to be directly exposed.
Wire manufacturers believe that the applications of mineral-insulated cables are as follows: The cable itself will not cause a fire, and it cannot burn or support combustion. It can continue to supply power even when ignited near the copper melting point, making it a fire-resistant cable. It is widely used in high-rise buildings, petrochemicals, airports, tunnels, ships, offshore oil platforms, aerospace, iron and steel metallurgy, shopping malls, parking lots, and other occasions.
Wire manufacturers believe that mineral-insulated cables are all flame-retardant cables. The flame-retardant mechanism of mineral-insulated cables: Flame retardants are added to the insulation and sheath materials of mineral-insulated cables. Under the action of the heat of the combustion reaction, the flame retardant in the condensed phase decomposes and absorbs heat, slowing down the temperature rise in the condensed phase and delaying the rate of thermal decomposition of the material. After the flame retardant is heated and decomposed, it releases chain reaction free radicals, interrupting the branches of the flame and chain reaction, and slowing down the gas-phase reaction rate. It catalyzes the condensation phase thermal decomposition of solid products, and the formation of a coke layer or foam layer enhances the heat transfer resistance of these layered hard shells. Under the action of heat, the flame retardant undergoes an endothermic phase change, physically preventing the temperature rise in the condensed phase.
Wire manufacturers believe that the installation and construction methods for the terminal heads of mineral-insulated cables are as follows:
1. According to the required cable length, first use a pipe cutter to cut a marking line on it. Then, use diagonal pliers to twist the copper sheath clamp clockwise between the jaws, gradually clamping the edge of the copper sheath, peeling it off at a small angle until the cut mark is reached.
2. Use a clean, dry cloth to clean the magnesium oxide insulation layer on the exposed wire, then place the wire bundle on the cable, and vertically screw the brass sealing cup onto the copper sheath of the cable. Initially, tighten it by hand, slide the bundle head on the sealing cup, and check the verticality of the sealing cup. After it is vertical, use pipe pliers to clamp the knurled seat of the sealing cup and continue installation until one end of the tiger skin is below the partial thread in the sealing cup.
3. Heat the cable with a torch flame, the flame is about 600 mm away from the starting point of the cable, and constantly move the flame to the open end of the cable to remove moisture. Remember to only move the flame to the open end of the cable, otherwise moisture will be brought into the cable.
4. Use an ohmmeter to measure the insulation resistance between the cores and between the cores and the sheath. If the measurement results meet the requirements, the sealing compound can be injected into the sealing cup. Note that the sealing compound should be added gradually from one side, not too fast, to exhaust the air. When the sealing compound is full, press on the cup cover, then use a heat-shrinkable tube to cover the core wires, and measure the insulation resistance with an ohmmeter. If the insulation is low, do it again.
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Address: Central Industrial Park, Luqiao District, Taizhou City, Zhejiang Province
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