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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!
05
2022
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07
Types and characteristics of mineral-insulated cables, explained by a wire manufacturer
Wire manufacturers believe that with the increase in high-rise buildings, rescue during fires in high-rise buildings is becoming increasingly important. In order to ensure a certain power supply time for rescue after a building fire, higher requirements are put forward for the building's power supply facilities, especially the ability of cables to maintain continuous and safe power supply under fire conditions. Wire manufacturers believe that mineral-insulated fire-resistant cables for fire systems are the guarantee for achieving this goal. Mineral-insulated cables, commonly known as fire-resistant cables, are made of mineral-insulated all-inorganic materials and have the characteristics of high temperature resistance, radiation resistance, corrosion resistance, and high mechanical strength. The operating temperature can reach 1000. It can not only be used in fire environments
Wire manufacturers believe that with the increase in high-rise buildings, rescue during fires in high-rise buildings is becoming increasingly important. To ensure a certain power supply time for rescue after a building fire, higher requirements are put forward for the building's power supply facilities, especially the ability of cables to maintain continuous power supply safety under fire conditions. Wire manufacturers believe that mineral-insulated cables for fire systems are the guarantee for achieving this goal. Mineral-insulated cables, commonly known as fire-resistant cables, are made of all-inorganic materials with mineral insulation and have characteristics such as high temperature resistance, radiation resistance, corrosion resistance, and high mechanical strength. The operating temperature can reach 1000. They can not only operate in a fire environment but also operate for a long time in harsh environments such as high temperature, high pressure, and strong corrosion where conventional organic insulated cables cannot be used.
Wire manufacturers believe that BTTZ cables use a single solid conductor. The nominal cross-section of single-core cables can be produced up to 400 mm2 (copper sheath outer diameter 31 mm), while multi-core cables can only be produced in specifications of 25 mm2 and below, making bending difficult. The bending radius usually requires a cable laying bending tool, also known as a steel mineral insulated cable.
Wire manufacturers believe that BTTZ and YTTW models use a copper sheath structure. The melting point of copper is 1083.4, and the cable can operate at temperatures below 1000. The copper sheath not only has good fire resistance but also, because copper is an excellent conductor, can be used as a cable grounding wire or protective grounding wire.
Wire manufacturers believe that in cases with higher requirements for bending performance, the copper sheath can be textured to improve its bending performance. BTLY cables use an aluminum sheath. There are generally three processing methods for aluminum sheaths: argon arc welding embossing process, aluminum rolling extrusion process, and chain armoring process. Extruded aluminum sheaths and argon arc welded aluminum sheaths have good moisture and water resistance. Wire manufacturers believe that combined with a plastic sheath, this cable can be used in humid environments. The extruded aluminum sheath has good density, no pinholes, poor welding, and other internal defects, and its bending performance is superior to that of embossed interlocked armored aluminum sheaths, suitable for occasions with relatively small bending radii. However, due to the gaps between the aluminum strips, the moisture and water resistance is weak, suitable for use in dry places.
Wire manufacturers believe that BTTZ and YTTW cables use copper sheaths with high melting points, so there is no explosion-proof structure. BTLY uses an aluminum sheath, and the melting point of aluminum is only around 660. Therefore, it is necessary to add a mineral mud fire-resistant layer to increase the fire resistance of the cable. The BBTRZ cable also does not have a metal sheath and adds a layer of mineral mud fire-resistant layer to increase the fire resistance of the cable, so the reliability is relatively poor.
Wire manufacturers believe that BTTZ and YTTW cables can decide whether to add a plastic sheath according to the on-site use of the cable. After adding a low-smoke halogen-free sheath, the model becomes BTTYZ and YTTWY. BTLY and BBTRZ cables both have plastic sheaths, generally using low-smoke halogen-free materials.
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