Classification of wire and cable
The classification of wire and cable
products can help you better understand the specifications and models. The main types of wire and cable are as follows:
1. Bare copper wire
Bare wire and bare conductor products are conductive wire without insulation and no sheath, which mainly include three series products, bare single wire, naked stranded wire and type line type material.
Copper and aluminum single line: including soft copper single line, hard copper single line, soft aluminum single line, hard aluminum single line. It is mainly used as a semi-product of various wires and cables, and a small amount is used for the manufacture of communication wire and electrical and electrical appliances.
Bare wire: including hard copper strand, hard aluminum strand, aluminum alloy stranded wire and steel-cored aluminum stranded wire, it is mainly used for electrical equipment and electronic appliances or components connection. The specifications of the above twisted wires are different from 1.0-300mm2.
2. Power cable
The Power cable is the most common cable product used for transmission and distribution of high power energy in the main line of power system, including 1 ~ 330KV and above all kinds of voltage level, all kinds of insulated power cables. The cross sections are 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 95, 95, 95, 95, 95, 95, 95, 95, 800mm2, and The core number is 1, 2, 3, 4, 5, 3+1 and 3+2.
The power cable is divided into low voltage cable, medium voltage cable, high voltage cable and so on. According to the insulation condition, it is divided into plastic insulated cable, rubber insulated cable, mineral insulated cable and so on.
3, overhead insulated cables
The overhead cable is also very common. It is characterized by no sheath. A lot of people have three misunderstandings about this kind of cable and correct it here.
First, its conductors are not only aluminum, but also copper conductors and aluminum alloys. Now there is also a steel core aluminum stranded overhead cable.
Second, it is not only a single core, the common one is a single core, but it can also be twisted together by several conductors.
Third, the voltage level of the overhead cable is 35KV and below, not the two kinds of 1KV and 10KV.
4. Control cable
This kind of cable structure is similar to the power cable, with the only copper core, no aluminum core cable, small conductor cross-section and more core, such as 24*1.5, 30*2.5 and so on. It is suitable for single control or unit control of power stations, substations, mines, petrochemical enterprises and so on at 450/750V and below the rated voltage. In order to improve the ability to control the internal and external interference of the control signal cable, the main measures are to set up the shielding layer.
5. Special cable
Special cables are special functions of cables, mainly including flame-retardant cables, low smoke halogen free cables, fire-resistant cables, explosion-proof cables, anti mouse cables, termite resistant cables, water blocking cables, etc.
Flame retardant cable, low smoke halogen free cable: mainly applicable to the important power and control system. This kind of cable is widely used in important places such as petrochemical, electric power, metallurgy, high rise building and densely populated.
Fire resistant cable: it is mainly applicable to the very important power and control system. When a line is in case of fire, the fire-resistant cable can resist 750~800 degree high temperature for more than 90 minutes, and ensure safe transmission, so as to win enough fire and disaster reduction time.