Mineral Insulated Cable is referred to as MI cable for short. When used as wiring, it is customarily called mineral cable or mineral fireproof cable in China
. Mineral insulated non-combustible cable is composed of copper core, mineral insulation material, copper and other metal sheaths. In addition to good electrical conductivity, mechanical and physical properties, and fire resistance, this cable also has good non-combustibility. Under fire conditions, this cable can not only provide fire-fighting power for the duration of the fire, but also not delay the flame and produce no toxic smoke.
Mineral insulated cable
Mineral Insulated Cable
Standard GB 50016-2014 jointly issued by the Housing and Urban-Rural Development of the People's Republic of China and the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on May 1, 2015 
On page 377, it is clearly stipulated that mineral-insulated non-combustible cables are composed of copper cores, mineral insulation materials, and copper metal sheaths.
Development and status
In 1896, the MI cable originated in Switzerland, spread to France in 1934, and began to develop in Britain and the United States in 1936. It is widely used because of its excellent fire resistance, including the domestic standard BS6387 for various mineral cables, which is also the British standard used. Up to here, all the cables mentioned were rigid cables. After MI cables were introduced into the country, due to their higher production cost restrictions, there were fewer production companies and users at the beginning, until 
After the implementation of GB / T50016 in 2015, it was explicitly required that MI cables be forced to be used in fire-fighting lines. At this point, MI cables ushered in the spring in China.
According to the structure can be divided into rigid and flexible two. According to the standard, it can be divided into national standard cables (rigid) and enterprise standard cables (flexible). Only rigid mineral cables have the old standard, which is extremely difficult to bend as the name implies, and transportation and installation have great limitations. Flexible mineral cables have their own standards, and manufacturers have different standards and varying quality.
There are only six types of national standard cables: 500V BTTQ, BTTVQ, and WD-BTTYQ, and 750V BTTZ, BTTVZ, and WD-BTTYZ.
The types of flexible cables are named by various manufacturers. Commonly, there are more than ten types such as BTWTZ, GAN-BTGYZ, BTLY, NG-A and so on.
Article 2.0.1 of "JGJ232-2011 Technical Regulations for Laying Mineral Insulated Cables" states: Mineral insulated cables are cables with ordinary annealed copper as the conductor, dense magnesium oxide as the insulation material, and ordinary annealed copper or copper alloy material as the sheath.
The domestic basis for detecting mineral cables is mainly C (simple combustion), W (spray), and Z (impact) tests in BS6387 "Fire Resistance Test Method for Cables to Maintain Integrity of Cables under Flame Conditions"; and GB / T19216. 21 "Line integrity test of cables or optical cables under flame conditions", "GB / T 13033-2007 Mineral insulated cables and terminals with a rated voltage of 750V and below".
Classification and difference
With the exception of the national standard cable (rigid), all other flexible mineral cables are standard.
Relatively speaking, the national standard cable has high technology and complicated and rigorous construction, because the metal sheath itself is extremely difficult to bend, the installation is difficult, and expensive special accessories are required. The fire resistance is also high. BS6387; Similarly, the construction threshold is low, but the fire protection performance also reaches BS6387. In the application, the matching products are mainly selected according to the fire protection level and importance of the building.
Rigid mineral cables can not be produced for a long time due to process limitations. Special accessories are used for installation, and special tools such as baking guns and bending wheels can be used for bending radius installation (6D). Flexible mineral cables can be continuously produced, and different metal sheath structures have different bending properties. Domestic technologies mainly include copper pipes (rigid), aluminum pipes, cross-welded corrugated copper pipes, and interlocked armored metal sheaths, allowing bending radius In order of decreasing, it is as small as 7D (D is the outer diameter of the cable, and the bending radius of ordinary cables is about 10D). The design and construction should consider the actual site and cable bridge restrictions, and select the appropriate product. Generally, the smaller the allowable bending radius, the less difficult it is to install.
Rigid mineral cables are relatively rigid, and they are also very resistant to impact. Flexible mineral cables are relatively flexible, and the impact resistance depends on the specific structural composition of the corresponding cable. However, all mineral cables except interlocked armored type are difficult to lay through curved pipes, especially large-size cables.
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