Fire-resistant cables have always been a very popular product type in the cable industry. Fire-resistant cables, that is, under the specified test conditions, the sample is burned. After the test-fire source is removed, the flame spread is only within a limited range, and the residual flame or residual burn is A cable that can extinguish itself within a limited time. In the event of a fire, it may be burned out and unable to operate, but it can prevent the spread of the fire and avoid greater losses. At present, the cable industry is used to refer to cables with certain fire resistance properties such as Fire Retardant, Low Smoke Halogen Free (LSOH) or Low Smoke Fume (LSF), Fire Resistant, etc. Fireproof cable.
1. Flame Retardant cable is characterized by delaying the spread of flame along the cable so that the fire will not expand. Because of its low cost, it is a large number of cable varieties used in fire-resistant cables. Regardless of whether it is a single cable or a bundle laying, the spread of the flame can be controlled within a certain range when the cable is burned, so it can avoid major disasters caused by the fire and extension of the cable, thereby improving the fire protection level of the cable.
2. Halogen-free low-smoke flame-retardant cables (LSOH) halogen-free low-smoke cables are characterized by not only excellent flame-retardant properties, but also the materials constituting the low-smoke and halogen-free cables are halogen-free, and have low corrosiveness and toxicity during combustion. , Produce a very small amount of smoke, thereby reducing the damage to the human body, instruments, and equipment, which is conducive to the timely rescue in the event of a fire. Although halogen-free low-smoke flame-retardant cables have excellent flame retardancy, corrosion resistance, and low smoke concentration, their mechanical and electrical properties are slightly worse than ordinary cables.
3. Low-halogen, low-smoke, flame-retardant cables (LSF), low-halogen, low-smoke, and flame-retardant cables have a hydrogen chloride release and smoke concentration index between flame-retardant cables and halogen-free low-smoke flame-retardant cables. Low halogen (Low Halogen) cable material will also contain halogen, but the content is lower. The characteristic of this kind of cable is that it not only possesses flame retardant properties but also emits less smoke and hydrogen chloride during combustion. This kind of low-halogen, low-smoke flame-retardant cable is generally made of polyvinyl chloride (PVC) as the base material, and then processed with high-efficiency flame-retardant, HCL absorbent, and smoke suppressant. Therefore, this flame-retardant material significantly improves the combustion performance of ordinary flame-retardant polyvinyl chloride materials. Heart Electric Knowledge Class
4. Fire-resistant cable (Fire Resistant) Fire-resistant cable can maintain normal operation for a certain period of time under the condition of flame burning and can maintain the integrity of the circuit (Circuit Integrity). Fire-resistant and flame-retardant cables produce less acid gas and smoke when they burn, and their flame-retardant properties are greatly improved. Especially when they are burned, the cable can still maintain the safe operation of the line under the condition of water spray and mechanical shock and vibration.
