Low-smoke halogen-free wires and cables produce a very small amount of smoke in the case of flame combustion. The released gas does not contain halogen (low halogen) elements and is non-toxic (low toxicity). When a fire occurs, it can greatly reduce the harm to instruments, equipment and human bodies, so it is widely used in high-rise buildings, hospitals, large libraries, gymnasiums, disaster prevention command and dispatch buildings, stations and civil airports, passenger waiting rooms, key cultural relics Protect places and subways, underground shopping malls or densely populated public places.
2. Technical performance
1) The maximum temperature of the wire and cable conductor during normal operation and the maximum temperature during short circuit (the longest duration does not exceed 5s):
Low-smoke and low-halogen PVC insulation is 70 ℃, and the maximum temperature during short circuit does not exceed 160 ℃;
Cross-linked polyethylene insulation is 90 ℃, thermoplastic low-smoke halogen-free polyolefin insulation is 80 ℃, and the maximum temperature during short circuit does not exceed 250 ℃. Irradiation cross-linked polyethylene insulation is 105 ℃, 125 ℃, and the maximum temperature during short circuit does not exceed 250 ℃.
2) The installation conditions and allowable continuous ampacity of low-smoke halogen-free cables are the same as those of corresponding non-low-smoke halogen-free cables.