This product is applicable to high-rise buildings, entertainment places and many construction projects requiring high quality and high safety in large cities with rated voltage of 0.6/1kV and below. It does not cut off the power supply in case of fire, but also achieves the goal of safety. It is mainly used for power supply lines of fire elevator, fire pump, fire alarm, smoke exhaust system, emergency lighting, fire hazard area, high temperature places and facilities requiring special safety in the fire protection system. (For example: important places of flammability and explosion and important equipment of power plants and nuclear power plants; places with high ambient temperature; equipment and lighting systems in important buildings or densely populated buildings; underground power supply lines, etc.).
The cable conductor is made of round copper wires, and its structure and DC resistance shall comply with GB/T3956. The insulation is made of mica tape with superior fire resistance and insulation performance, and the material performance meets the requirements of Appendix C of GB/T19666. 0.14mm ± 0.02mm mica tape shall be used to wrap the conductor evenly and tightly. The number of wrapping layers shall not be less than 4, and the coverage rate shall not be less than 45%. When the conductor section of multi-core cable is less than 35mm2, alkali free glass fiber rope shall be used for cable filling. When the conductor cross section of multi-core cable is greater than 35mm2, the conductor structure can only use the sector structure to improve the roundness of the cable, reduce the outer diameter of the cable and save material costs. After cabling, wrap it with alkali free glass fiber tape. Copper sheath shall be made of TU grade oxygen free copper tape or T2 grade copper tape materials not lower than those specified in GB/T5231. This layer adopts argon arc welding to weld the joint, and the strength of the welding joint shall not be less than 80% of the base metal. The average thickness of the copper sheath shall not be less than the standard, and the thickness of the thinnest point of the copper sheath shall not be less than 90% of the average thickness..
Mineral insulated cable is made of copper with high conductivity as conductor, inorganic magnesium oxide as insulation and seamless copper tube as sheath by special process. Due to the particularity of its material and structure, this product has incomparable electrical performance, mechanical performance, environmental resistance and environmental protection performance compared with mechanical cable (plastic cable). It is fireproof, explosion-proof, waterproof, smokeless, halogen-free, non-toxic, high temperature resistant, corrosion resistant, radiation resistant, electromagnetic interference resistant, large current carrying capacity, strong overload capacity, high mechanical strength, small size, light weight, long service life, good grounding and other characteristics. The long-term service temperature of bare cable is 250 ℃, and the power supply can last for 3h at 950~1000 ℃ (90min according to the national standard), and it can work close to the copper melting point of 1083 ℃ for a short time or an extraordinary period.