耐热和高温电线电缆一般是由两种需求决定的
耐热和高温电线电缆一般是由两种需求决定的。第一种是电线电缆环境温度较高，电缆在长期在高温下能够正常传输信号或电能；另一种是电力传输电缆，主要是增加截流能力为主要目的。
高温环境下工作的电缆。普通电缆在高温时易产生绝缘老化和焦烧现象，使用电缆失去机能，受破坏而不能使用。高温电缆在额定高温下能够正常不乱地工作，信号或电能传输机能不受影响，还能保证电缆具有较长的使用寿命。这类功能电缆是高温电缆最常见最多的一种，使用特性也最易于理解的。
增载型高温电缆，主要是为了保证载流的前题下减小电缆外径和重量，向轻量化发展的。一般来说，电缆的工作温度越高，同样截面的电缆通过的载流量越大。象飞机和汽车等场合，减轻重量的意义相称大，利用高温电缆大大减少了截面。工作温度从90℃升到155℃，则载流能力上升50%，同样载流量下，电缆重量要减轻一半，本钱也有所降低。当然高截流的同时，大多数绝缘材料的电能损耗也会有所增加。
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