What is the difference between flame-retardant cables and fire-resistant cables? Can they be replaced? Most people easily confuse flame-retardant cables with fire-resistant cables. Although flame-retardant cables have the advantages of low-smoke, low-halogen and flame-retardant, flame-retardant cables are It cannot replace the fire-resistant cable, and there is still a difference between the two.
What is flame retardant wire and cable?
While maintaining the electrical and physical and chemical properties of ordinary cables, flame-retardant cables are self-extinguishing, that is, they are not easy to burn, or when the cable itself catches fire or an external fire source ignites for some reason, the cable will not continue to burn after the fire is extinguished , or the burning time is very short (within 60 minutes), or the length of the flame delay is very short.
Due to its low cost, it blocks and delays the spread of flame along the cable, so that the fire will not expand. Therefore, it is a cable variety widely used in fireproof cables. The cable may be burnt out in the event of a fire and cannot operate, but it can prevent the spread of the fire and avoid greater losses.
The structure of the flame-retardant cable is basically the same as that of the ordinary cable, the difference is that all or part of its insulating layer, sheath, outer sheath and auxiliary materials (taping and filling) are made of flame-retardant materials.
What is a fire-resistant cable?
The fire-resistant wire and cable can continue to work (transmit current and signal) in the event of a fire, and whether its own flame delay is not included in the assessment. The flame-retardant cable will stop working quickly when a fire occurs, and its function is to be flame-retardant and self-extinguishing without being affected; while the fire-resistant cable can maintain normal operation for 180 minutes in a flame burning at 750-800 °C.
The fire-resistant cable has the power supply capacity for a certain period of time in the flame, and can maintain the normal operation of the line for a certain period of time under the condition of flame burning. In layman’s terms, in case of fire, the cable will not burn immediately, and the circuit is safer.
The structure of the fire-resistant cable is basically the same as that of the ordinary cable. The difference is that the conductor of the fire-resistant cable is a copper conductor with good fire resistance (the melting point of copper is 1 083 ℃), and a fire-resistant layer is added between the conductor and the insulating layer. The refractory layer is made of multi-layer mica tapes. Because the allowable working temperature of different mica tapes varies greatly, the key to the fire resistance of cables is the mica tape.
The difference between flame-retardant cables and fire-resistant cables
1. The structural materials are different. The material of the flame-retardant cable is mainly made of flame-retardant raw materials, and its outer layer is made of flame-retardant sheath, and its fillers are all made of flame-retardant materials. The fire-resistant cable is composed of a conductor and an insulating layer, and a layer of fire-resistant layer is added in the middle.
2. The principle is different. The flame retardant cable mainly uses the flame retardant effect produced by the halogen material, so that the temperature can be lowered by the water outlet, and the purpose of flame extinguishing can be achieved. The fire-resistant cable uses a mica material. According to the performance of this material, it has the characteristics of fire resistance and heat resistance, so it can prolong the use time in the event of a fire.
The difference between flame-retardant cables and fire-resistant cables is introduced here. We need to make accurate purchases according to the specific needs of the project. Huijue Network provides various weak current cables. If you need them, you can call +8613916913483.