Functions Of Low-Voltage Power Cables

The cable is a conductor covered with insulating layer, protective layer and shielding layer, which is used to transmit power, signal current and signal voltage. Compared with low-voltage overhead lines and low-voltage overhead insulated lines, although low-voltage power cables are expensive and difficult to lay and maintain, they operate reliably, do not erect columns, do not occupy the ground, are not ugly, and are less affected by external influences. It is widely used in low-voltage power cable system.

Low voltage power cable is used to transmit and distribute electric energy. They are usually used for urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers. At present, household low-voltage power cables have single core, double core, three core, four core and five core. Single core cable can be applied to single phase line or three-phase line as required. Two core cables are used for single-phase lines. Three phase three wire and three phase four wire use three core, four core and five core cables respectively.

How to select low-voltage power cable?

Aluminum core cables shall be used in general environment and places, while copper core cables shall be used in places with strong vibration, special buildings and special requirements.

Low voltage power cables laid on the ground usually use armored cables with outer sheaths. In places where mechanical damage is unlikely, plastic sheathed cables and lead (aluminum) sheathed cables with outer sheaths can also be used.

Buried wires and cables shall not be used as far as possible in the soil with chemical corrosion or stray current corrosion. If it is to be buried underground, anti-corrosion cable shall be used.

Wires and cables laid in pipelines usually use plastic sheathed cables, but bare armored cables are also used.

For wires and cables used for electrical equipment, cables laid in cable trenches or cable tunnels shall not use flammable or extended outer sheaths. Generally, bare armored cables, plastic sheathed wires and cables and bare lead (aluminum) covered cables are used.

When placing wires and cables in places with large height difference, plastic insulated cables, drip free cables and dry insulated cables shall be used.