Power Line Classification
Bare wires: conductors without insulation on the surface, divided into electrical round copper rods, electrical round copper wires, electrical aluminum wires, tinned round copper wires, electrical flat copper wires, copper and aluminum bus bars, hard copper stranded wires, and aluminum stranded wires Wire, ACSR, anti-corrosion ACSR;
Copper and aluminum stranded wire: twisted by multiple single-core solid wires, used for outdoor high and low voltage overhead lines;
Copper and aluminum busbars: divided into round busbars and rectangular busbars. Rectangular busbars have a large carrying capacity and are widely used in high and low voltage power distribution equipment. The power feeder to the communication equipment has a minimum cross-sectional area of 15*10mm and a maximum cross-sectional area of 120*10mm. When it needs to carry a large load current, two or more wires can be connected in parallel;
Insulated wire: a wire with an insulating layer on the outside of the conductor, including rubber and polyethylene (PVC);
Insulated wires are divided into hard wires and soft wires. Hard insulated wires are generally used as indoor and outdoor overhead laying lines, architectural lighting pipeline laying lines, architecturally designed water pumps and fan motor pipeline laying power lines, and wiring lines between switchboard cabinets. , Copper-aluminum stranded wire is used for outdoor high and low voltage overhead lines.
Power cables: used for fixed laying of power transmission and power distribution lines, different types of power cables can be applied to different laying methods, such as direct burial, pipe penetration, overhead cable racks, troughs and tunnels, etc., divided into single cores , dual-core, three-core, four-core, five-core, etc.;
Prefabricated branch cables: with the characteristics of simple installation and low environmental requirements, they are widely used in residential buildings, hotels, hospitals, shopping malls, factory power distribution systems, roads, bridges, and tunnel lighting systems. In communication hub projects, prefabricated branch cables are mainly For high-rise building lighting, air conditioning power distribution. The cost is high, and on-site investigation is required for cable production. If the installation site is changed after the cable production is completed, the original prefabricated branch cables cannot be used;
Control cables: insulation materials are made of polyethylene (PVC) insulation (with single sheath, double sheath and armored), divided into general control cables, shielded control cables and multi-core shielded computer cables according to the place of use and purpose. The rated voltage of the control cable is divided into two grades of 450/750V and 0.6V/1KV, which are respectively suitable for the electrical control circuit, monitoring circuit, protection circuit and power signal connection of the corresponding voltage level;
The cross-sectional area series of control cables are 0.7, 1.0, 1.5, 2.5, 4, 6, 10mm2, and the recommended core number series are 2, 3, 4, 5, 7, 8, 10, 12, 14, 16, 19, 24 , 27, 30, 37, 42, 44, 48, 52, etc.
