Fire-resistant wires are a general term for wires and cables with fire-resistant properties, and are usually divided into flame-retardant wires and cables and fire-resistant wires and cables. The general public can easily confuse flame retardant cables and IEC 60331 fire-resistant cables.
However, flame-retardant cables have many advantages that are more suitable for chemical companies, such as low halogen, low smoke and flame retardant. Generally speaking, fire-resistant power cables can replace flame-retardant cables, but flame-retardant cables cannot replace fire-resistant cables. Below ZW Cable briefly introduces their differences and characteristics.
Fire-resistant cables and flame-retardant cables are different. The flame retardant principle of halogen-containing cables relies on the flame retardant effect of halogen. The flame retardant principle of halogen-free cables relies on the precipitation of water to reduce the baking temperature to extinguish fires. Fire-resistant cables rely on the fire-resistant and heat-resistant properties of the mica material refractory layer to ensure that the cable can work normally in the event of a fire.
As a new technology, the much-criticized cable is a representative of fire-resistant cable. Its principle is that the cable can form a self-supporting ceramic body in the flame, which has a certain strength and can be used in the flame. The cable will not be damaged at temperatures between 650 and 1000°C. Therefore, fire-resistant cables produce very little smoke in a fire and are halogen-free, which is of great help to the environment. Moreover, the cable is easy to install, so many customers are willing to buy it.
Fire-resistant cables and flame-retardant cables differ in structure and materials.
The basic structure of flame retardant cables is:
The insulation layer is flame retardant.
Both the inner and outer sheaths are made of flame retardant materials.
The tape and filler are made of flame retardant materials.
Fire-resistant cables add a fire-resistant layer between the conductor and the insulation layer. A fire-resistant layer can be added to the structure of a fire-resistant cable to form a fire-resistant and refractory cable, but in practical applications, this is not necessary. Because the fire-resistant layer of the fire-resistant cable can usually be directly wrapped around the wire using different refractory materials. It can resist burning for a long time, ensuring the normal operation of the production line even if the polymer is burned at the applied flame.
The characteristic of flame-retardant wires is to delay the spread of flames along the cables so that the fire will not expand. Due to its lower cost, fire-resistant cables sell very well.
Fire-resistant cables can maintain normal operation for a certain period of time under flame burning conditions and maintain the integrity of the line. Fire-resistant cables produce less smoke when burning, especially the use of refractory materials, which make them fire-resistant and flame-retardant. Especially in the case of burning, the cable can still maintain its integrity when sprinkled with water to extinguish the fire. Wired operation.