According to the different flame retardant materials, fire-retardant cables are divided into halogen-free flame retardant cable and halogen-free flame retardant cable two categories.

Among them, halogen-containing polyethylene (PVC) flame-retardant materials are used in all or part of the insulating layer, the sheath, the outer sheath and the auxiliary materials (tapes and filling) of the halogen-containing flame retardant cable, thereby having good flame retarding properties. Xiaobian prompt burning of the cable will release a lot of smoke and halogen acid gas, halogen acid gas on the surrounding electrical equipment corrosive hazards, rescue workers need to bring gas masks to be close to the scene to put out the fire. Cable burning to the surrounding electrical equipment and rescue workers cause harm, is not conducive to fire fighting and rescue work, resulting in serious "secondary harm."