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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!
20
2022
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07
Some knowledge points about mineral cables, told by wire manufacturers
Wire manufacturers believe that mineral-insulated cables are the main fire-resistant cables that ensure power transmission in modern construction projects, suitable for power supply lines such as fire power supply, uninterrupted power supply, and emergency lighting power supply. Most high-rise buildings on the market need mineral-insulated cables, and the market application is very mature. Wire manufacturers believe that the characteristics of mineral-insulated cables are as follows: 1. High operating temperature: Wire manufacturers believe that mineral-insulated cables can withstand continuous operating temperatures as high as 250. However, in emergencies, the cable can continue to operate for a short time at temperatures close to the melting point of the copper sheath;
Wire manufacturers believe that mineral-insulated cables are the main fire-resistant cables that ensure power transmission in modern construction projects, suitable for power supply lines such as fire power supply, uninterruptible power supply, and emergency lighting power supply. Most high-rise buildings on the market require mineral-insulated cables, and the market application is very mature.
Wire manufacturers believe that the characteristics of mineral-insulated cables are as follows:
1. High operating temperature: Wire manufacturers believe that mineral-insulated cables can withstand continuous operating temperatures as high as 250°C. However, in emergencies, the cable can continue to operate for a short time at temperatures close to the melting point of the copper sheath;
2. Fire resistance: The two materials used in mineral-insulated cables, copper and magnesium oxide, are both inorganic substances. This cable will not burn or contribute to combustion, and can continue to operate under conditions close to flames;
3. Explosion-proof: The highly dense insulation material in mineral-insulated cables can prevent steam, gases, and flames from passing between equipment components connected to the cable;
4. Long service life: Wire manufacturers believe that mineral-insulated cables use inorganic materials to ensure the stability, long life, and fire resistance of the cable;
5. Waterproof: If the mineral-insulated cable is completely submerged in water, the mineral-insulated cable can continue to operate with its seamless metal sheath;
6. Small outer diameter: Wire manufacturers believe that the diameter of mineral-insulated cables is smaller than other cables with the same rated current;
7. High mechanical strength: Mineral-insulated cables are strong and durable, able to withstand severe mechanical damage without impairing their electrical performance;
8. Large current carrying capacity: Wire manufacturers believe that for cables of the same cross-sectional area, mineral-insulated cables transmit higher currents than other types of cables. At the same time, mineral-insulated cables can withstand considerable overloads.
9. High corrosion resistance: The copper sheath of mineral-insulated cables has high corrosion resistance. For most equipment, it does not require additional protective measures. In places where the copper sheath of the cable is susceptible to chemical corrosion or severe industrial pollution, mineral-insulated cables wrapped in plastic sheaths should be used for protection.
10. High short-circuit fault rate: Wire manufacturers believe that at the same temperature, the short-circuit fault rate of mineral-insulated cables is significantly higher than that of other types of cables.
11. Good grounding: For mineral-insulated cables, no independent grounding conductor is needed, because the copper sheath used in this cable already acts as a grounding conductor, providing excellent low grounding resistance.
Wire manufacturers believe that the construction points of mineral-insulated cables are:
1. Joints are prone to moisture. Wire manufacturers believe that the insulation layer of the cable is composed of mineral magnesium oxide. During the construction of the cable head, when the cable end is stripped and the conductor is exposed, it is easy to react chemically with moisture in the air to produce conductive magnesium hydroxide. The insulation resistance of general cables is above 100MΩ, but if the cable head is manufactured within 1 hour, the insulation resistance can drop to below 10MΩ, or even below 0.5MΩ. This type of cable used in engineering will inevitably bring electrical hazards.
2. Cable circuits should be numbered, and the circuit number and phase sequence should be marked at the end, starting point, and intermediate joints of each circuit. This avoids errors caused by too many phase sequence circuits.
3. Wire manufacturers believe that mineral-insulated cables in engineering are mostly composed of single-core cables, so eddy currents are easily generated in the cable fixing fittings. If the eddy current is too large, it will not only cause a large amount of loss but also accelerate the aging speed of the cable fixing fittings. Therefore, eddy currents should be avoided or minimized in actual construction. Therefore, on-site cable fixing fittings usually require anti-eddy current measures, using reasonable cable phase sequence arrangement to minimize eddy currents.
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Guangzhou Baiyun International Airport
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2021-04-13
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Address: Central Industrial Park, Luqiao District, Taizhou City, Zhejiang Province
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