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电线电缆在使用过程中会受到两种形式的损伤:①机械的——挤压、弯折、拉伸、碰撞等原因;②高温的——通电时由自身电阻耗电所产生的热积聚发热而致,另外还有周围环境温度太高而引起。电线电缆的绝缘材料在高温状态下,电气性能和机械性能都会变差变坏,绝缘材料变软、熔化、甚至燃烧。因此,各国消防规范对消防用电设备的配电线路都有特别规定。符合消防规范的配电线路,其电线电缆的绝缘材料的电气性能与机械性能,能够确保在规定的温度与时间范围内正常送电,不会因热损伤而劣化,而导致
Wire and cable will be subject to two forms of damage during use: 1 mechanical - extrusion, bending, stretching, collision and other reasons; 2 - high temperature - heat generated by the self-resistance of its own heat accumulation This, in addition, is caused by too high ambient temperature. Insulation materials of wire and cable are subject to deterioration in electrical and mechanical properties at high temperatures, and the insulation material becomes soft, melts, and even burns. Therefore, there are special regulations on the distribution lines of fire-fighting electricity equipment in various countries. The electrical and mechanical properties of the insulation material of the wire and cable comply with the fire protection regulations, and ensure that the power is transmitted within the specified temperature and time range without deterioration due to thermal damage.