Mainly include glued copper conductor, inorganic mineral insulating layer, metal sleeve isolation layer, color separation isolation layer, halogen-free filling strip, mineral fireproof layer, high flame retardant tape, low-smoke halogen-free sheath from the inside to the outside. made. Although the melting point of aluminum is only 660°C, the expanded refractory layer extruded on the outside of the aluminum tube is foamed and solidified under the attack of the flame, forming a thick barrier to block the direct injection of the flame to the aluminum tube. The integrity of the aluminum tube is preserved, and the heating temperature of the outer mica tape is reduced to below 600°C.
Product performance standards:
1. BS 6387:1994 Performance requirements for cables to maintain circuit integrity under flame conditions;
Features of NG-A (BTLY) aluminum sheath or aluminum alloy sheath isolation (flexible) mineral insulated fireproof cable products:
1. The fire resistance standard can pass the three-phase assessment of British BS6387:
That is to say, it will not break down under the flame of 950℃ for 3h, withstand 5min of water spray after 30min at 650℃ (direct immersion in water), and withstand the knocking vibration for 15min under the flame of 950℃ without damage, so that the fire resistance completely reaches the BTTZ level. Assessment criteria);
2. The continuous length is long without joints;
3. During the installation process, it can be laid as a whole without needing to wear pipes, and it has the same waterproof and insect repellant functions as BTTZ.
4. It has good anti-rat, anti-ant and anti-radiation functions;
5. The working temperature of the core is lower than that of other types of cables, the line loss is low during work, energy saving and environmental protection;
6. Explosion-proof. (Used in places where there is a danger of explosion and links to various explosion-proof equipment and equipment)
7. The metal sheath of the cable has high corrosion resistance;
8. High mechanical strength. (Even if it is subjected to severe mechanical damage, its electrical properties will not be damaged)