Mineral Insulated Cable

Mineral-insulated cable is a high-performance cable composed of a metal sheath (typically copper), magnesium oxide powder as the insulation layer, and a metal conductor (copper or aluminum). Its structure consists, from the inside out, of the conductor, mineral insulation layer, and metal sheath, all compressed and sealed at high temperatures to form an integrated rigid or flexible structure. This type of cable features exceptional fire resistance, withstanding temperatures above 1000°C and maintaining power supply for extended periods during fires (typically ≥ 3 hours), without combustion or emission of toxic gases. It also offers waterproof, explosion-proof, corrosion-resistant, and impact-resistant properties, with a service life of several decades to even over a century, remaining virtually unaffected by environmental humidity, chemical corrosion, or physical wear. Based on structural differences, it can be divided into rigid mineral-insulated cables (such as the BTTZ type, with a seamless copper tube sheath and high hardness) and flexible mineral-insulated cables (such as the BTLY type, designed with special processes for flexibility and ease of bending installation). These cables are widely used in nuclear power plants, super high-rise buildings, large hospitals, subways, tunnels, and other critical areas with stringent fire safety and reliability requirements, serving as a core cable type for ensuring stable operation of essential power and signal systems under bad conditions.