电缆
电缆通常是由几根或几组导线绞合而成的类似绳索的电缆,每组导线之间相互绝缘,一般都围绕着一根中心扭成,整个外面包有高度绝缘的覆盖层。电缆多架设在空中或装在地下、水底,用于电讯传播或电力输送。电缆与普通电线相比有一定区别,主要是电缆尺寸较大,结构较复杂。电缆主要由四部分组成:导电核心、绝缘层、密封护套、保护覆盖层。根据用途电缆分为电力电缆、通信电缆和控制电缆等。
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