Low voltage and middle voltage Cable

The structure of low voltage cable is composed of wire core, insulating layer and protective layer. The wire core is used to conduct current and is usually made of copper or aluminum strands twisted together. Low voltage cable has single core, double core, three core, four core and so on. Dual-core cables are used for single-phase lines, three-core and four-core cables are used for three-phase three-wire and three-phase four-wire lines respectively, and single-core cables can be used for single-phase or three-phase lines as required. Compared with low voltage overhead line and low voltage overhead insulation line, low voltage overhead insulation line costs more and is more difficult to lay and maintain, but it is widely used in low voltage distribution system due to its characteristics such as reliable operation, no pole, no occupation of the ground, no eyesore and little external influence. The common laying methods of low voltage cables include direct buried laying, cable trench laying, tunnel laying and wall laying. Low voltage cables refer to 0.6/1kV, and middle voltage power cables refer to power cables of 3-35 kV and below. Both low voltage and high voltage cables are power cables.