At present, power 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), etc., collectively referred to as fire resistant cables.
Fire retardant cable
The characteristic of fire retardant cable is to delay the spread of flame along the cable to prevent the fire from spreading. 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 flame spread can be controlled within a certain range when the cable is burned, so it can avoid major disasters caused by the cable fire and prolonged combustion, thereby improving the fire protection level of the cable line .
Halogen-free low-smoke fire-retardant cable (LSOH)
The characteristics of halogen-free low-smoke cables are not only excellent flame-retardant properties, but also that the materials constituting the low-smoke halogen-free cables are halogen-free, have low corrosiveness and toxicity during combustion, and produce a very small amount of smoke, thereby reducing the impact on the human body. , The damage of instruments and equipment is conducive to timely rescue in the event of a fire. Although halogen-free low-smoke fire-retardant cables have excellent flame retardancy, corrosion resistance and low smoke concentration, their mechanical and electrical properties are slightly worse than ordinary cables.
Low-halogen, low-smoke flame-retardant cable (LSF)
low-halogen, low-smoke, flame-retardant cables have a hydrogen chloride release and smoke density index between flame-retardant cables and halogen-free low-smoke fire-retardant cables. Low halogen cable material will also contain halogen, but the content is lower. The characteristics of this cable are not only flame retardant, but also less smoke and hydrogen chloride release 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 fire-retardant material significantly improves the combustion performance of ordinary flame-retardant PVC materials.