At present, the electrical system industry is accustomed to collectively refer to fire-retardant (Fire retardant), halogen-free and low-smoke (LS0H) or low-halogen and low-smoke (Lowsmokefume, LSF), fire resistant (Fire resistant) and other electrical appliances with certain fire resistance properties as fire-resistant cables.
1. Flame retardant cable
The characteristic of flame-retardant cables is to delay the spread of flame along the electricity so that the fire will not expand. Because of its low cost, it is a large number of cable varieties used in fire-proof electricity. Regardless of whether it is a single wire or a bunch of laying conditions, when the cable is burned, the flame can be controlled within a certain range, so it can avoid major disasters caused by the cable fire and prolonged combustion, thereby improving the fire protection of the electric line Level.
2.Halogen-free low-smoke flame-retardant cable (LSOH)
The characteristics of halogen-free low-smoke cables are that they not only have excellent flame retardant properties, but also that the materials that constitute low-smoke and halogen-free do not contain halogens. They have low corrosiveness and toxicity during combustion, and produce a very small amount of smoke, thereby reducing the impact on humans and instruments. In addition, the damage caused by the design is conducive to timely rescue in the event of a fire. Although the non-branch low-smoke flame-retardant cable has excellent flame-retardant, corrosion resistance and low smoke concentration, its mechanical and electrical properties are slightly worse than ordinary cables.
3. Low halogen and low smoke flame retardant cable (LSF)
Low-halogen, low-smoke and flame-retardant cables have a hydrogen chloride release and smoke density index between flame-retardant cables and halogen-free low-smoke flame-retardant cables. Low halogen (Lowhalogen) 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 retardants, HCL absorbents and smoke suppressants. Therefore, this flame-retardant material significantly improves the combustion performance of ordinary flame-retardant polyvinyl chloride materials.
4. Fire resistant cable (Fireresistant)
Fire-resistant and fire retardant cables can maintain normal operation for a certain period of time under the condition of flame burning, and can maintain the integrity of the circuit (Circuitintergrity). Fire-resistant and flame-retardant cables produce less acid gas and smoke when they burn, and their fire-resistant and flame-retardant properties are greatly improved. Especially when they are burned, accompanied by water spray and mechanical shock, the cable can still keep the line intact.