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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!
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2021
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Introduction to the Classification and Differences of Mineral Insulated Cables
Mineral cable structure composition Hongsheng: The main basis for domestic testing of mineral cables is BS6387 "Fire test method for maintaining circuit integrity of cables under flame conditions", including C (simple combustion), W (spray), and Z (impact) tests; and national standards GB/T19216.21 "Circuit integrity test of cables or optical cables under flame conditions", "GB/T 13033-2007 Mineral insulated cables and terminals with rated voltage of 750V and below".
Mineral cable structure composition
Hongsheng: The main domestic basis for testing mineral insulated cables includes BS6387 "Fire test method for maintaining circuit integrity of cables under flame conditions", including C (simple combustion), W (spray), and Z (impact) tests; and national standards GB/T19216.21 "Circuit integrity test of cables or optical cables under flame conditions", and "GB/T 13033-2007 Mineral insulated cables and terminals with rated voltage of 750V and below."
Classification and differences of mineral insulated cables
Hongsheng: Except for national standard cables (rigid), all other flexible mineral insulated cables are enterprise standards.
Relatively speaking, national standard cables have advanced technology, complex and rigorous construction, because the metal sheath itself is difficult to bend, the installation is more difficult, and expensive special accessories are required, and the fire performance is also higher BS6387; while flexible cables are similar to ordinary cables in installation, with a low construction threshold, but the fire performance also meets BS6387. In application, products matching the building fire rating and importance should be selected.
Rigid mineral insulated cables cannot be produced in longer lengths due to process limitations, and require special accessories for installation and use. The bending radius can be achieved (6D) when using special tools such as a blowtorch and bending wheel. Flexible mineral insulated cables can be continuously produced, and different metal sheath structures have different bending properties. Domestic technologies mainly include copper tubes (rigid), aluminum tubes, transverse welded corrugated copper tubes, and interlocking armored metal sheaths. The allowable bending radius decreases successively, to a minimum of 7D (D is the cable outer diameter, the bending radius of ordinary cables is about 10D). The actual site and cable tray limitations should be considered in design and construction, and appropriate products should be selected.
Hongsheng: Generally speaking, the smaller the allowable bending radius, the easier the installation. Rigid mineral insulated cables are inherently hard and have very strong impact resistance. Flexible mineral insulated cables have stronger flexibility, and impact resistance depends on the specific structure of the cable. However, except for the interlocking armored type, all mineral insulated cables are difficult to lay in curved pipes, especially large-sized cables.
Mineral cable
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