Mineral insulated cables are referred to as MICC cables, and when used as wiring, they are also customarily referred to as mineral cables or fireproof cables.
Mineral-insulated cables consist of inorganic materials such as copper conductors, mineral insulation, and copper or other metal sheaths.
In 1996, the English Channel Tunnel connecting Britain and France had a serious fire, installed the tunnel mineral insulated cable system was even after the destruction of reinforced concrete and welded steel rails, but the evacuation of passengers to provide emergency lighting, and withstood the fire and high temperature of the severe test.
Because mineral insulated cables have the quality and performance of ordinary cables that can not be compared, it is also more and more widely used.
At present, the most commonly used mineral insulated cables in the cable market are mainly the following three kinds:
Without outer sheath for BTTZ, BTTQ models, with outer sheath BTTVZ, BTTVQ, WD-BTTYZ.
It consists of a solid copper rod, magnesium oxide insulation, and a seamless copper tube sheath.
Without outer sheath YTTW, RTTZ, with outer sheath YTTWV, WD-YTTWY, RTTZV, WR-RTTZY, BTTW, BTTRZ models.
It consists of copper-stranded wire, fluorine mica tape insulation, and copper tape longitudinally wrapped with a continuous welded sheath.
Generally NG-A, BTLY models.
It consists of copper-stranded wire, gold mica tape insulation, seamless aluminum tube sheath, oxygen barrier filling, isolation fire-resistant layer, and low-smoke halogen-free sheath.
Above 3 types of cables, the best fire resistance is the BTTZ series, which is the only recognized high-standard mineral insulated cable in the international market.
It adopts a high conductivity solid copper conductor, highly compressed powdered magnesium oxide as insulation, and a seamless copper tube as sheath.
It is also made by a special process of modern building wiring cable and special industries, such as metallurgy, chemical industry, petroleum, and other cables.
Due to the special nature of its materials and structure, the product has electrical properties, mechanical properties, environmental performance, and environmental performance that cannot be compared with organic cables.
This unique structure makes the melting point of the conductor and insulation materials 1083°C and 2800°C respectively.
This enables the cable to be used in fire conditions while the equipment can continue to operate safely under load even at temperatures over 1000°C.
● Service life of up to 100 years.
● Does not burn, does not support combustion, does not release toxic gases, zero combustion energy.
● Continuous operating temperatures up to 250°C and short-term operating temperatures up to 1083°C.
● Excellent fire resistance.
● Excellent fire resistance, cable can be reused after fire.
● Cable terminations and intermediate couplings are supplied with the cable for enhanced fire resistance reliability.
● The cable can withstand extremely high temperatures, falling objects, and fire water spraying during a fire.
● The cable can be used in high-temperature applications.
● Water, moisture, oil, and corrosion resistance.
● No aging, extremely stable cable performance.
● The metal sheath of the cable can be used as a grounding circuit.
● Excellent mechanical strength, good bending performance, can be used in complex structures and tight space installation environments.
● High current-carrying capacity due to the special characteristics of the cable structure.
● Small cable outer diameter, easy installation, low overall cost, no need to protect the cable through the pipe.
● Good explosion-proof performance and excellent resistance to nuclear radiation.
● Excellent electromagnetic shielding performance and electromagnetic compatibility.
● Can prevent animals from biting.
Mineral insulated cables can be used 1 to 2 sizes lower and save a ground wire core.
Most people think that mineral-insulated cables are expensive and do not use them.
Through the continuous efforts of manufacturers and material suppliers in recent years, the price of mineral-insulated cables is constantly approaching the price of ordinary cables.
Mineral insulated cable cross-sections of 25 mm2 or more are single-core cables, and thus the cable's current-carrying capacity than ordinary cables to be larger.
At the same time, the copper sheath of mineral insulated cable can be used directly for the grounding line so that the selection of mineral insulated cable can reduce a cable core.
For example, in China's National People's Congress Hall auditorium lighting system renovation project, the original plan was to use fire-resistant cable through the tube then decided to switch to mineral-insulated cable.
The two programs proposed to select the same cable specifications are small-size cables.
However, according to the total cost of the final project, with mineral insulated cable and fire-resistant cable price ratio of 97.59:100.
With the expansion of the scope of application of mineral insulated cables, many installation or construction units began to contact mineral insulated cables.
Some project units do not understand the construction method of the product and do not know how to install it, resulting in many project installation problems, and some construction units resist the use of mineral insulated cable.
The cable is a simple way to put the line and does not need special tools and auxiliary facilities.
Laying can either go to the bridge, bracket or open laying.
In the cable accessories terminal and coupler installation, the manufacturer will send professional and technical personnel to the site to guide and support the supply of special construction tools.
Now the use of cable accessories is pressure-mounted, and the accessory connection is simple, and easy to operate, for the first contact, with less than two hours can master the installation and laying technology.
In addition, the mineral-insulated cables purchased from ZMS can be provided with a detailed explanation of the cable installation method, giving guidance on installation.
Installers can install and lay the cables without the guidance of the manufacturer's technicians as long as they follow this procedure.
Due to the many excellent characteristics of mineral insulated cables, and the manufacturing plant's vigorous promotion, the mineral mineral-insulated cable market gradually springs.
In recent years, it has been adopted by many electrical design codes or standards at home and abroad, and also used in many projects in different industries.
It can be expected that in the next decade, the use of mineral insulated cables will continue to rise significantly.
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