Communication cables are cables that carry telephones, telegrams, fax documents, television and radio programs, data and other electrical signals. It is made by twisting a pair of mutually insulated wires. The communication cable has the advantages of large communication capacity, high transmission stability, good confidentiality, less influence by natural conditions and external interference compared with the overhead line. Communication cable: A communication cable made up of a plurality of mutually insulated conductors or conductors and a sheath that protects the cable core from moisture and mechanical damage. Figure 1 provides a photograph of the communication cable. In places where the environment is particularly severe, a protective layer can also be installed outside the sheath of the communication cable if necessary.
The cable core is composed of a plurality of conductors or conductors insulated from each other, and the outside has a sealed jacket communication line. Some have outer sheaths outside the sheath. There are a variety of laying methods such as overhead, direct burial, pipelines and underwater. According to the structure, it is divided into symmetrical, coaxial and integrated cables; it is divided into field and permanent cables (underground and submarine cables) according to its functions. The communication cable has a wide transmission band, large communication capacity, and small external interference, but it is not easy to overhaul. Can transmit telephones, telegrams, data and images.
Classification model
(1) City Communication Cable Product Model:
HYA HYV HYAV HYAC (self-supporting) HYAT (oil rushing) CPEV CPEV-S
(2) Coal mine special communication cable product model:
MHYA(PUYA) MHYV(PUYV) MHYAV(PUYAV) MHYVR(PUYVR)
(3) Shielded communication cable:
HYVP HYAP MHYVP MHYVP MHYVRP RVSP (Shielded Twisted Pair)
(4) Armored communications cable:
HYA53 MHYA32 MHYV22 MHYAV22 MHYAV32 HYAT53 HYV22 HYV32 HYA32
HYV53 HYVP22 HYAP22 HYAP32 MHYVP22 MHYVP32 MHYVRP22 MHYVRP32
(5) Flame-retardant communication cable:
ZR-HYA ZRA-HYA ZA-HYA ZRC-HYA WDZ-HYA ZR-YJYR
classification
Cable type classification
According to the type of cable, the communication cable is classified as follows:
1, single wire: refers to the most primitive communications cable, single-wire loop, with the earth as a regression line.
2. Symmetrical cable: It consists of two wires that are identical under ideal conditions.
3. Coaxial cable: The two conductors inside and outside on the same axis will form a loop. The outer conductor surrounds the inner conductor and both are insulated.
Instrument cable, instrument signal cable: instrument signal cable can be produced according to user requirements (JXVPV-3) type of electronic industrial signal cable (DYVP) electric instrument signal cable (JYPV, JVVP)
Collective instrumentation signal cable, (IJYPVP) intrinsically safe explosion-proof circuit with distributed instrumentation signal cable intrinsic safety, please refer to the previous connection, refer to the structure of the computer cable.
1, product use:
This product is suitable for signal transmission and control circuits in instruments, instruments and other electrical equipment.
2, product use features:
The AC rated voltage of the cable is less than 500V, and the long-term operating temperature of the cable core should not exceed 70°C. The allowable bending clearance of the cable shall not be less than 6 times the outer diameter of the cable, and the laying temperature shall not be lower than 0°C.
3, product model, name and scope of use
model
name
Range of use
YVV PVC insulated PVC sheathed instrument cable Fixed laying for connection of instruments and meters
YVVP PVC insulated PVC sheathed shielded cable Same as above for anti-jamming
RVV PVC insulated PVC sheathed instrument cable for soft applications
RVVP PVC insulated PVC sheathed instrumentation shielded flexible cable with RVV type for anti-interference applications
4, the scope of production
model
Number of cores
Nominal section (mm 2 )
YVV
YVVP
RVV
RVVP
2,3,4,5,6,7,8,10,12 0.5 0.75 1.0 1.5 2.5
signal cable
First, the scope of application
This product is suitable for connecting all kinds of electrical instruments and automatic devices such as AC signal 250V or DC 500V and below, such as railway signal interlock and fire alarm signal.
wiring.
Second, the implementation of standards
TL/2002.10-03
Third, the use of features
1. The long-term allowable operating temperature of cable conductors should not exceed 65°C, and the ambient temperature for laying should not be lower than 0°C.
2. The cable laying installation allows the bending radius non-armoured cable to be not less than 10 times the outer diameter of the cable; the armored cable should not be less than 15 times the outer diameter of the cable.
Fourth, model, name
Model Name
PVV
PVC insulated PVC sheathed signal cable
PYV
Polyethylene insulated PVC sheathed signal cable
PVV22
PVC insulated PVC sheathed steel tape armored signal cable
PYV22
Polyethylene insulated PVC sheathed steel tape armored signal cable
