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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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2020
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Introduction to mineral cables
Hongsheng: Mineral-insulated cable, a type of cable with a copper conductor core wrapped in a copper sheath, and using magnesium oxide powder as an inorganic insulating material to isolate the conductor from the sheath. An appropriate protective sheath can be selected for the outer layer as needed. Commonly known as MICC or MI cable. A similar cable uses metal instead of a copper sheath to wrap the core wire and insulating material, called mineral-insulated metal-sheathed cable.
Introduction
Hongsheng Mineral-insulated cable, also known as MICC or MI cable, is a type of cable with copper conductors encased in a copper sheath, and the conductor and sheath are insulated by magnesium oxide powder as an inorganic insulating material. An appropriate protective sheath can be selected for the outer layer as needed. A similar cable uses metal instead of a copper sheath to encapsulate the core wire and insulating material, called mineral-insulated metal-sheathed cable.
Development and Current Status
Hongsheng: Mineral-insulated cables originated in Switzerland in 1896, spread to France in 1934, and began to flourish in the UK and the US in 1936. Due to their excellent fire-resistant properties, they are widely used. The domestic testing standards for various mineral-insulated cables, BS6387, are also based on British standards. Until this point, the discussion has been about rigid cables. After MI cables were introduced to China, due to their high production costs, the initial number of manufacturers and users was limited. It wasn't until the implementation of GB/T50016 in 2015, which mandated the use of MI cables for fire protection lines, that MI cables experienced a boom in China.
Mineral Insulated Cable Meaning of the Term
Hongsheng: According to structure, they can be divided into rigid and flexible types. According to standards, they can be divided into national standard cables (rigid) and enterprise standard cables (flexible). Rigid mineral cables have old national standards; as the name suggests, they are very difficult to bend, and transportation and installation are extremely limited. Flexible mineral cables of the RTTZ type have a national standard GB/T 34926-2017; other models have standards set by various manufacturers, with varying standards and inconsistent quality among manufacturers.
There are only six types of national standard rigid cables: BTTQ, BTTVQ, WD-BTTYQ (light load, 500V), and BTTZ, BTTVZ, WD-BTTYZ (heavy load, 750V).
National standard flexible cable models: RTTZ, RTTYZ, RTTVZ, voltage levels: 0.6/1kV or 450/750V
Other flexible cable models are named by various manufacturers. Common ones include BTWTZ, GAN-BTGYZ, BTLY, NG-A, totaling more than a dozen types.
Article 2.0.1 of JGJ232-2011, Technical Regulations for the Installation of Mineral Insulated Cables, states: Mineral insulated cables are cables that use ordinary annealed copper as the conductor, dense magnesium oxide as the insulating material, and ordinary annealed copper or copper alloy material as the sheath.
Hongsheng, mineral cable
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