For reasons of work, various types of cables, wires, network cables, and cable television lines are often used, but often only a few types are used. The commonly used methods and applications of cables, wires, network cables, and cable television lines are briefly described. induction.
First, the meaning of various commonly used letters
R-connecting flexible cable (wire), soft structure. V-insulated PVC. V-PVC insulation V-PVC sheath B-flat (flat). S-twisted type. A-tin or silver plating. F- high temperature P-bracketed shield P2- copper tape shield P22-steel tape armored
Y-prefabricated, generally omitted, or polyolefin sheathed FD-product category code, refers to the branch cable. The Ministry of Construction standards to be promulgated are represented by FZ, which are essentially the same YJ-XLPE insulated V-PVC insulated or sheathed ZR-flame-retardant NH-refractory WDZ-Halogen-free low-smoke flame retardant WDN-None Halogen low smoke refractory type
Second, cable knowledge
Cables are usually divided into power cables and control cables.
1, the meaning of the cable symbol:
[1]ZR-Flame Retardant, NH-Fire-Resistant, ZA(IA)-Intrinsically Safe
〔2〕 use. Power cable default representation, K-control cable, P-signal cable, DJ-computer cable
[3] Insulation. V-polyvinyl chloride, Y-polyethylene, YJ-crosslinked polyethylene, X-rubber, Z-paper
[4] Conductors. The T-copper core defaults to the L-aluminum core.
[5] Inner sheath (sheath), V-PVC, Y-polyethylene, Q-lead, L-aluminium, H-rubber, HF-non-combustible rubber, LW-wrinkle aluminum sheath, F - Neoprene, N-butyl rubber sheath.
[6] Features. Do not need to indicate that the package type, F-phase lead-phased phase-separated jacket, D-no oil, CY-oil, P-shielded, C-filter, Z-DC
[7] Armored layer. 0-None, 2-double strip (24-steel strip, thick round wire), 3-thick round wire, 4-thick round wire (44-double round wire).
[8] The outer layer. 0-None, 1-fiber layer, 2-PVC sheath, 3-PE sheath.
[9] Rated voltage. Expressed in numbers, kV.
2, examples of commonly used cables:
VV copper core PVC insulated PVC sheathed power cable.
VV22 copper core PVC insulated PVC sheathed power cable .
YJV XLPE insulated, PVC sheathed power cable
3, the meaning of the specification
Specifications using the number of cores, nominal cross section and voltage level
1 Specification of single-core branch cable: Number of cables in the same loop*(1*nominal section), 0.6/1KV,
For example: 4*(1*185)+1*950.6/1KV
2 Multi-core stranded branch cable specification notation: number of identical loop cables* nominal cross section, 0.6/1KV,
For example: 4*185+1*950.6/1KV
Third, wire knowledge
1, the general meaning of the wire symbol:
[1] Code. B-wire (sometimes not indicated)
[2] Conductors. T-copper (default), L-aluminum, R-soft copper
[3] Insulation. V-PVC, X-rubber, F-chloroprene rubber
[4] Sheath. V-polyvinyl chloride
[5] Others. R-soft wire, P-shielded, B-parallel
2, examples of commonly used wires:
(1), BX, BLX: rubber insulated wire. Fixed laying in indoor or outdoor, bright, dark or wear pipe, as equipment installation line.
(2), BXF, BLXF: neoprene insulated wire. With BX type, good weather resistance, suitable for outdoor use.
(3), BXHF, BXLHF: Rubber insulated and sheathed wires. With the BX type, it is suitable for humid places and as an outdoor entrance line.
(4), BV, BLV: PVC insulated wire. Same type BX, but better moisture resistance and weather resistance.
(5), BVR: PVC insulated soft wire. The same type BV is only used for soft installation.
(6), BV-10 V, BLV-105: heat-resistant 105 °C PVC insulated wire. Same as Type BV, used in high temperature environments of 45°C and above.
(7), BVR-105: heat-resistant 105 °C PVC insulated soft wire. With BVR type, used in high temperature environments of 45°C and above.
Fourth, video file transmission material (such as: cable TV) knowledge
Video file signal transmission cable. There are roughly three kinds of coaxial cables, twisted pairs, and optical fibers.
Describe the commonly used coaxial cable knowledge:
1. Classification of Coaxial Cables: Coaxial cables for video file transmission are SYV75-III, SYV75-V, SYV75-7, SYV75-9, SYV75-12
2, the meaning of the letters:
SYV75-5-1 (A, B, C)
SYV75-5-41 (A, B, C)
SYV75-5-2 (A, B, C)
S stands for RF coaxial cable
Y represents polyethylene (PE) insulation
V stands for polyvinyl chloride (PVC) jacket
75 stands for characteristic impedance 75 ohms
5 represents the approximate value of the insulating outer warp
-1, -41 or -2 represents the structural form code. General -1 or -41 represents the inner conductor is single-core; -2 represents the inner conductor is multi-core
A: 64 series B: 96 series C: 128 series
