It is very easy for ordinary people to confuse the concepts of flame retardant cable and fire-resistant cable. Timely flame retardant cable has many advantages suitable for chemical enterprises, such as low halogen and low smoke flame retardant. But in general, fire-resistant cable can replace flame-retardant cable, but flame-retardant cable can not replace fire-resistant cable. The main points are as follows:

1、 The difference of principle

The principle between fire-resistant cable and flame-retardant cable is different. The flame retardant principle of halogen cable mainly depends on halogen flame retardant effect, and the flame retardant principle of non halogen cable mainly depends on the precipitation of water to reduce the temperature to extinguish the fire. Fire resistant cable depends on the mica material in the fire-resistant layer, which is fire-resistant and heat-resistant, so it can ensure that the cable can work normally in case of fire.

2、 The difference between structure and material

The structure and material of fire-resistant cable are also different from that of flame-retardant cable. The basic structure of flame retardant cable is as follows:

(1) The insulation layer is made of flame retardant material.
(2) The sheath and outer sheath are made of flame retardant materials.
(3) Flame retardant materials are used for wrapping and filling.

The fire-resistant cable usually adds a fire-resistant layer between the conductor and the insulation layer, so theoretically, the fire-resistant layer can be added to the structure of the fire-resistant cable to form a fire-resistant and fire-resistant cable, but it is not necessary in practice. Because of the fire resistant layer of the fire resistant cable, the multi-layer mica tape is usually directly wrapped on the conductor. It can endure a long time of burning, even if the polymer at the flame is burned, it can also ensure the normal operation of the line.

Flame retardant cable

3、 Clear concept, advantages and disadvantages of flame retardant cable, halogen free cable and fire resistant cable

The characteristic of flame retardant cable is to delay the flame extending along the cable, so that the fire will not expand. Because of its low cost, it is widely used in fireproof cables. Whether it is a single cable or a bunch of laying conditions, the flame extension of the cable can be controlled within a certain range when it is burning, so it can avoid the major disasters caused by the fire extension, so as to improve the fire protection level of the cable line.

The characteristics of halogen-free low smoke flame retardant cable are that it not only has good flame retardant performance, but also contains no halogen in the material of low smoke halogen-free cable, which has low corrosiveness and toxicity when burning, and produces a very small amount of smoke, so as to reduce the damage to personal instruments and equipment, which is conducive to timely rescue in case of fire. Although it has good flame retardancy, corrosion resistance, few smoke concentration and so on. But its mechanical and electrical properties are slightly worse than ordinary cables.

Fire resistant cable can be used normally for a certain period of time under the condition of flame combustion, which can ensure the integrity of the line. The amount of acid gas smoke is less when the fire-resistant and flame-retardant cable burns, so the fire-resistant and flame-retardant performance can be greatly improved. Especially in the case of burning, accompanied by water spray and mechanical strike, the cable can still maintain the complete use of the line.