A cable is a conductor covered with an insulation layer, protective layer, shielding layer, etc., used to transmit power or signal current or signal voltage. According to voltage, it can be divided into high-voltage cables and low-voltage cables. Compared with low-voltage overhead lines and low-voltage overhead insulated lines, low-voltage cable lines have higher costs and are more difficult to lay and maintain. However, due to their reliable operation, no poles, no floor occupation, unobstructed view, and less external influence, they are widely used in low-voltage distribution systems
Insulation materials in cables that have a specific function of withstanding voltage. The insulation layer is divided into two types: core insulation and strip insulation: the insulation wrapped on the wire core is called core insulation; The insulation of multi-core cables is called strip insulation when the insulated cores are combined and then covered. Insulate and separate from the protective layer to form reliable ground insulation. The insulation layer is usually made of oil immersed paper, plastic, rubber, etc. (1) Paper insulated cables are cables that use impregnated cable paper as the insulation layer, collectively known as paper insulated cables. According to the situation of paper impregnation, it can be divided into: ① oil immersed paper insulated cables; ② Dry insulated cable; ③ Non drip cable. (2) The insulation layer is made of thermoplastic extruded and cross-linked cables, collectively known as plastic cables, which are widely used. Plastic cables can be divided into three types: polyvinyl chloride cables, polyethylene cables, and cross-linked polyethylene cables. A cable that uses materials such as natural styrene butadiene rubber, butyl rubber, and ethylene propylene rubber as insulation layers is called a rubber cable. Low voltage cables with a voltage level of 1kV can use paper insulated cables and plastic cables, with plastic cables being more commonly used; Low voltage cables with a voltage level of 0.5 kV mostly use rubber cables
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