What is the function of mineral-insulated fire-resistant cables?
Release date:
2022-07-02 12:32
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What is the function of mineral-insulated fire-resistant cables?
Mineral-insulated fire-resistant cable It is a mineral cable product with superior fire-resistant performance. Featuring high safety standards, it is ideal for applications in locations with stringent requirements. The cable effectively safeguards against animal bites, chemical corrosion, and external mechanical impacts. With a continuous operating temperature of up to 250°C, the mineral-insulated cable can maintain power supply for 3 hours at temperatures ranging from 950°C to 1000°C. In fact, it can even operate briefly or over extended periods at temperatures close to copper’s melting point—1083°C. Thanks to its outstanding performance, this mineral-insulated cable is perfectly suited for circuits rated up to 1000V.
Mineral-insulated fire-resistant cables are primarily used in critical electrical engineering applications, such as hazardous areas, essential public facilities, and locations where personal and property safety are paramount. They are commonly installed in places like airports, fire stations, high-rise buildings, libraries, shopping malls, hospitals, and more. Once installed and laid, mineral-insulated cables can last indefinitely. These cables consist of highly conductive copper conductors, mineral (magnesium oxide) insulation material, and a seamless copper sheath. When the cable is exposed to environments prone to copper corrosion, an additional anti-corrosion protective outer jacket is added. Mineral-insulated cables offer numerous advantages, including fire resistance, water resistance, explosion-proof capabilities, non-combustibility, zero smoke emission, non-toxicity, and excellent fire endurance.
1) Cable conductor: Uses highly conductive copper as the conductor.
2) Insulation Layer: High-temperature-resistant, non-combustible inorganic minerals serve as the insulation material.
3) Isolation layer: Inorganic mineral material. 4) Outer protective layer: Low-smoke, non-toxic plastic material with excellent corrosion resistance.
Commonly Used 3 Types of Mineral-Insulated Fireproof Cable Models
Copper-core copper-sheathed magnesium oxide-insulated cable: composed of solid copper rods, magnesium oxide insulation, and a seamless copper tube sheath. Flexible inorganic mica mineral-insulated cable: made up of copper stranded wires, fluoromica insulation cables, and a continuously welded sheath formed by longitudinally wrapping copper tape.
Aluminum-sheathed flexible, isolation-type mineral-insulated cable (NG-A, BTLY): Composed of copper stranded conductors, gold mica tape insulation, a seamless aluminum tube sheath, an oxygen barrier layer for filling, a fire-resistant isolation layer, and a low-smoke, halogen-free outer jacket.
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