Fire-resistant cables are not flame-retardant cables
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The difference between principles
The principle of fire-resistant cable and flame-retardant cable is different. Halogen-containing cable flame retardant principle is based on the flame retardant effect of halogen, halogen-free cable flame retardant principle is to rely on precipitation of water to lower the temperature to extinguish the fire. Fire-resistant cables rely on the fire-resistant and heat-resistant properties of the mica material in the fire-resistant layer to ensure that the cable is working properly in the event of a fire.
Difference between structure and material
The structure and materials of fire-resistant cables are also different from those of flame-retardant cables.
The basic structure of the flame-retardant cable is:
(1) Flame retardant material (2) is used for the insulating layer and flame retardant material is used for the outer sheath;
(3) Flame retardant materials are used for wrapping and filling.
The fire-resistant cable is usually an additional fire-resistant layer between the conductor and the insulation layer, so theoretically a flame-retardant layer can be added to the structure of the flame-retardant cable to form a flame-retardant and fire-resistant cable, but in practice There is no need for this.
Because of the refractory layer of fire-resistant cables, multilayer mica tape is usually used to directly wrap around the conductors. It can withstand long-term combustion, even if the polymer at the flame is burned, it can ensure the normal operation of the line.
Flame-retardant cables, halogen-free cables, fire-resistant cables, clear concepts and advantages and disadvantages
Flame retardant cable is characterized by retarding the spread of flame along the cable so that the fire will not expand. Because of its low cost, it is a large variety of cables used in fire protection cables. Whether it is a single cable or a bundled cable, the cable can control the spread of the flame within a certain range when it is burned. Therefore, it is possible to avoid the major disasters caused by the ignition of the fire, thereby increasing the fire protection level of the cable line.
Halogen-free and low-smoke flame-retardant cables are characterized by not only good flame-retardant properties, but also halogen-free materials that constitute low-smoke halogen-free cable materials, which are less corrosive and toxic when burned, and produce a very small amount of smoke, thereby reducing the Damage to people, equipment, and equipment is conducive to timely rescue in the event of fire. Although it has good flame retardancy, corrosion resistance, and low smoke concentration, it is slightly inferior in mechanical and electrical performance to ordinary cables.
Fire-resistant cables are normally operated for a certain period of time in the event of a flame, maintaining the integrity of the line. The flame-retardant cable produces less sour fume when burned, and the fire-retardant flame-retardant performance is greatly improved. Especially when burning, along with the water spray and the mechanical blow, the cable can still maintain the complete operation of the line.