Flexible mineral insulated cable mineral insulated cable can be divided into rigid and flexible according to structure. There are only six types of national standard rigid mineral insulated cables: bttq, bttvq and wd-bttyq with light load of 500V, and bttz, bttvz and wd-bttyz with heavy load of 750V
The models of national standard flexible mineral insulated cables are rttz, rttyz and rttvz, and the voltage grade is 0.6/1kv or 450 / 750V.
Performance of flexible mineral insulated cables
1. High ignition point
In order to ensure the flexibility of cables in use, inorganic materials are used to improve the hard structure of traditional cables. Inorganic materials have high ignition point, are not easy to burn and have strong temperature resistance, which is an important reason why the cable is called flexible cable. It should be known that ordinary cables generally use organic polymer materials in the selection of insulating layer and sheath layer materials, Although it can play the role of fire prevention and temperature resistance, under the condition of flame, the insulating layer and sheath layer are prone to carbonization, which will not only lead to the loss of insulation of the insulating layer and the loss of protection of the protective sleeve. If the flame temperature is relatively high, it will directly burn out the insulating layer and sheath layer.
2. Structural stability
Flexible mineral insulated cable is one of the representative types of flexible cable. In addition to high ignition point and strong fire resistance, the cable structure is also very stable. Based on the traditional cable structure design, it is reformed to improve the process structure and enhance the stability of the cable in use.
3. Environmental protection
Flexible mineral insulated cables are made of inorganic materials, which are pollution-free and environment-friendly in use. In addition, cables also have superior withstand voltage and strong bearing capacity in use.
4. Light texture
This flexible cable is a jointless design because the cable is very light and can be laid in a variety of ways during installation.
National standard for flexible mineral insulated cables
The process structure of flexible mineral insulated cable is exactly the same as that of traditional cable. The cross-sectional area of bbtrz cable is 1.5 square to 500 square meters for single core and 1.5 square to 300 square meters for multi-core. In the field of fire-proof cable, the investment cost of the investment unit is reduced to the greatest extent, and the safety and fire performance grade of the building is improved.
National standard for flexible mineral insulated cables: at present, the state has not issued relevant standards, but rigid mineral cables have been issued (GB / t13033). Relatively speaking, the strictness of enterprise standards is greater than industry standards and national standards.
Executive standard: enterprise standard q04-2016
Fire rating: bs6387cwz
Working temperature of Conductor: the maximum allowable long-term temperature of conductor is 90 ° C. when overloaded, the long-term working temperature of cable conductor can reach 250 ° C.