First, the cable concept

• Product application or size class name
• product structure materials or types;
• Important or additional features of the product

• 0 none ---
• 1 interlocking armor
• 2 double steel strip PVC jacket
• 3 thin round wire polyethylene jacket
• 4 thick round wire
• 5 wrinkles (rolling) steel strip
• 6 double aluminum (or aluminum alloy) belt
• 8 copper wire weaving
• 9 steel wire weaving

•  Power system
  The wire and cable products used in the power system mainly include overhead bare wires, bus bars (bus bars), power cables (plastic cables, oil-paper cables (substantially replaced by plastic power cables), rubber cables, overhead insulated cables), and branch cables. (Replaces some busbars), magnet wires, and electrical equipment, wires and cables for power equipment.
•  Information transmission system
  The wire and cable used for the information transmission system mainly includes local telephone cable, television cable, electronic cable, radio frequency cable, optical fiber cable, data cable, electromagnetic wire, power communication or other composite cable.
• Mechanical equipment, instrumentation system
  This part is used in almost all other products except for overhead bare wires, but mainly power cables, magnet wires, data cables, instrumentation cables, etc.

• Bare wire and bare conductor products
  The main features of this product are: pure conductor metal, no insulation and sheath layer, such as steel core aluminum stranded wire, copper-aluminum busbar, electric locomotive line, etc.; processing technology is mainly pressure processing, such as smelting, rolling, pulling System, stranding/tightening stranding, etc.; products are mainly used in suburbs, rural areas, user main lines, switch cabinets, etc.
• power cable
  The main features of this type of product are: extrusion (winding) insulation on the outer conductor, such as overhead insulated cable, or stranding (corresponding to the phase, neutral and ground of the power system), such as overhead insulated cables with two cores or more , or add a jacket layer, such as plastic / rubber sheathed wire and cable. The main process technologies include drawing, stranding, insulation extrusion (winding), cable-forming, armoring, and sheath extrusion. The different process combinations of various products have certain differences. The products are mainly used for transmission of strong electric energy in the transmission, distribution, transmission, transformation and power supply lines. The currents passing through are large (tens of amps to several thousand amps) and high voltages (220V to 500kV and above).
• wire and cable for electrical equipment
  The main features of this type of product are: wide variety of specifications, wide application range, use voltages of 1kV and below, and new products such as fire-resistant cables, flame-retardant cables, low-smoke halogen-free/low Smoke low halogen cable, termite resistant, mouse cable, oil/cold resistant/temperature resistant/wear resistant cable, medical/agricultural/mineral cable, thin wall wire, etc.
• communication cable and fiber (a brief introduction)
  With the rapid development of the communication industry in the past two decades, the products have also experienced phenomenal development speed. From the simple telephone telegraph cable in the past to thousands of pairs of cable, coaxial cable, optical cable, data cable, and even a combination of communication cables. The structure size of such products is usually small and uniform, and the manufacturing precision is high.
• electromagnetic wire (winding wire)
  Mainly used in various motors, instruments and so on.

1. use code - not marked as power cable, K is the control cable, P is the signal cable;
2. insulation code -Z oil-impregnated paper, X rubber, V polyvinyl chloride, YJ cross-linked polyethylene
3. Conductor material code - not marked as copper, L is aluminum;
4. inner sheath code - Q lead package, L aluminum package, H rubber sleeve, V PVC sheath
5. the derived code -D does not drip, P dry insulation;
6. the outer layer code
7. special product code -TH wet tropical, TA dry tropical;
8. rated voltage - unit KV

1. SYV: solid polyethylene insulated RF coaxial cable
2. SYWV (Y): physical foaming polyethylene insulated cable TV cable, video (RF) coaxial cable (SYV, S YWV, SYFV) for closed-circuit monitoring and cable TV engineering
SYWV (Y), SYKV cable TV, broadband network dedicated cable structure: (coaxial cable) single oxygen-free round copper wire + physical foamed polyethylene (insulation) + (tin wire + aluminum) + polyvinyl chloride (polyethylene) )
3. Signal control cable (RVV sheathed wire, RVVP shielded wire) is suitable for building intercom, anti-theft alarm, fire protection, automatic meter reading and other projects.
RVVP : Copper core PVC insulated and sheathed PVC sheathed flexible cable Voltage 300V/300V 2-24 core Application: instrument, instrument, intercom, monitoring, control installation
4. RG: physical foamed polyethylene insulated access network cable for transmitting data analog signals in coaxial fiber hybrid network (HFC)
5. KVVP: PVC sheathed braided shielded cable Uses: signal transmission, control, measurement of electrical appliances, instruments, power distribution devices
6. RVV (227IEC52/53) PVC insulated flexible cable Uses: household appliances, small power tools, instruments and power lighting
7. AVVR PVC sheathed flexible cable for installation
8. SBVV HYA data communication cable (indoor and outdoor) for telephone communication and connection of radio equipment and wiring box wiring for telephone wiring network
9. RV, RVP PVC insulated cable
10. RVS and RVB are suitable for household appliances, small power tools, instruments, meters and power lighting connection cables.
11. BV, BVR PVC insulated cable Uses: Suitable for electrical instrumentation equipment and power lighting fixed wiring
12. RIB speaker cable (fever line)
13. KVV PVC insulated control cable Uses: Signal transmission, control and measurement of electrical appliances, instruments and power distribution equipment
14. SFTP twisted pair transmission telephone, data and information network
15. UL2464 computer cable
16. VGA display line
17. SYV coaxial cable Transmitting RF signals in wireless communication, broadcasting, monitoring system engineering and related electronic equipment (including integrated coaxial cable)
18. SDFAVP, SDFAVVP, SYFPY coaxial cable, dedicated to elevators
19. JVPV, JVPVP, JVVP copper core PVC insulated and sheathed copper wire braided computer control cable

1. copper
   Conductivity is second only to silver, thermal conductivity is second only to gold and silver; corrosion resistance, non-magnetic, good plasticity, easy to weld, and widely used. Copper alloys mainly improve the wear resistance, corrosion resistance and mechanical properties of copper.
2. silver
   The metal has the highest conductivity and thermal conductivity, has good corrosion resistance and oxidation resistance, and is easy to weld; it is mainly used for plating and cladding; it is mainly used as high temperature resistant wire and (note: according to the principle of skin effect) Frequency communication cable conductor.
3. aluminum
   good corrosion resistance, general mechanical strength, good plasticity and small specific gravity. The disadvantage is that the tensile strength is low and it is not easy to weld. Aluminum alloys mainly improve the mechanical strength, heat resistance and weldability of aluminum.
4. gold, nickel
   Used as a high temperature resistant wire.
5. iron (steel)
   It is often used as a reinforcing material for composite conductors, such as steel core aluminum wire, copper clad steel, aluminum clad steel wire, and the like.
6. zinc
   Used as a coating for steel/steel strip/iron conductors to prevent corrosion.
7. tin
   Used as a wire/copper wire coating to prevent corrosion and facilitate copper wire bonding.

1. Under the eaves. The standard LAN cable can be used only when the cable is not directly exposed to sunlight or high temperature. It is recommended to use the pipe.
2. The outer wall. Avoid direct sunlight on the wall and human damage.
3. In the pipe (plastic or metal). In the pipeline, pay attention to the damage of the plastic pipe and the heat conduction of the metal pipe.
4. Suspended application / overhead cable. Consider the drooping and pressure of the cable. Which type of bundling is intended? Is the cable exposed to direct sunlight?
5. Lay directly in the underground cable trench, this environment is the smallest control area. Cable trench installations should be regularly checked for dryness or humidity.
6. Underground pipelines. In order to facilitate future upgrades, cable replacement and isolation from surface pressure and surrounding environment, auxiliary piping is isolated, and auxiliary piping is a better method. But don't expect the pipeline to remain dry forever, which will affect the choice of cable type.

1. When the cable lines cross each other, the high voltage cable should be below the low voltage cable. If one of the cables is protected by a pipe within 1 m before and after the intersection or separated by a partition, the minimum allowable distance is 0.25 m.
2. When the cable is close to or intersects with the heat pipe, if there is insulation, the minimum distance between parallel and cross is 0.5m and 0.25m respectively.
3. When the cable crosses the railway or the road, it should be protected by a pipe. The protection pipe should extend beyond the track or road surface by 2m.
4. The distance between the cable and the building foundation should ensure that the cable is buried outside the building's scattered water; when the cable is introduced into the building, it should be protected by a pipe, and the protective pipe should also be outside the building's scattered water.
5. The distance between the cable directly buried in the ground and the grounding of the general grounding device should be 0.25~0.5m; the buried depth of the cable buried directly in the ground should not be less than 0.7m, and should be buried under the frozen soil layer.