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What cables can weak electricity be used? Knowledge of wires and cables that need to be mastered in weak electricity security

“Chen Hong Science Popular”

There are many types of weak wire cables. The cable models used in each system are different and different functions. Friends who do weak electricity must understand the commonly used weak wire cables.

1. Definition of wires and cables

Wires and cables refer to materials used for power, communication and related transmission purposes. “Wires” and “cables” do not have strict boundaries. Products with small core numbers, small products, and simple structures are called wires, and those without insulation are called nude wires, and others are called cables.

Second, the principle of weak electric cable naming

1. The content included in the product name:

(1) Product application occasion or size category name

(2) Product structure material or type;

(3) Important features or additional features of the product

Basically named after the above order, sometimes in order to emphasize important or additional features, the features are written before the previous or corresponding structural description.

2. The order of structural description

Product structure description is based on the principle of inside to outside: conductor-> insulation-> internal care layer-> external care layer.

3. Simplify

Without causing confusion, some structural descriptions are described in the province. E.g:

SYV 75-5-1 (A, B, C) S: RF Y: Polyethylene insulation V: Polyethylene cover A: 64 Edit B: 96 Edit C: 128 Edit 75:75 Ohm 5: The line diameter is 5mm 1: Represents the single core

SYWV 75-5-1 S: ​​RF Y: Polyethylene insulation W: physical foam v: polyvinyl chloride cover 75:75 ohm 5: cable outer diameter is 5mm 1: represents single core

RVVP2*32/0.2 R: Soft line VV: Double -layer protective cover Plog 2: 2 core multi -stock line 32: 32 copper wire 0.2: each copper wire diameter is 0.2mm

ZR-RVS2*24/0.12 ZR: Flame retardant R: Soft line S: 2: 2 Core Multifoginal 24: There are 24 copper wires per core: 0.12mm per copper wire diameter of 0.12mm

Third, weak electric cable composition

It is composed of internal conductor, insulation, external conductor and cover;

Internal conductor: Because attenuation is mainly caused by internal conductor resistance, the internal conductor has a great impact on signal transmission

Insulation: Affect attenuation, resistance, back loss loss and other performance

External conductor: carrier conductor, shielding effect

Fourth, common cable code meaning

RVVP: Copper core Polyvinyl chloride insulation shielded polyvinyl chloride sheet soft cable voltage 300V/300V 2-24 core use: instrument, instrument, intercom, monitoring, control installation installation installation

KVVP: Polyvinyl chloride cover woven shielding cable use: signal transmission, control, measurement of electrical, instruments, and power distribution devices

SYWV ( Y )、 SYKV 有线电视、宽带网专用电缆结构:(同轴电缆)单根无氧圆铜线+ 物理发泡聚乙烯(绝缘) + (锡丝+ 铝) + 聚氯乙烯(聚乙烯Cure

RVV polyvinyl chloride insulation soft cable use: household electrical appliances, small electric tools, instrument and power lighting

Soft cable for installation for AVVR Polyvinyl chloride cover

RV, RVP polyvinyl chloride insulation cable

RVS and RVB are suitable for household electrical appliances, small electric tools, instruments, instruments, and power lighting cables

BV, BVR Polyethylene insulation cable use: suitable for electrical instrument equipment and power lighting fixed wiring

Fifth, the selection of common weak wire cables

The distance from the video cable to the monitoring host is ≤200 meters, and the SYV75-3 video cable is used. The distance from the camera to the monitoring host> 200 meters, use the SYV75-5 video cable. Network digital video surveillance, camera transmission is transmitted with twisted lines, such as CAT5E, CAT6, and so on.

The distance between the gimbal control line and the controller is ≤ 100 meters, and the RVV6 × 0.5 sheath wire is used. The distance between the gimbal and the controller is> 100 meters, and the RVV6 × 0.75 sheath wire is used. In fact, RVVP2*075 is generally used

Most of the cables used by the building intercom are RVV, RVVP, SYV and other cables

6. The difference between common weak electric cables

Syv and SYWV: SYV is a video transmission line, which uses polyethylene insulation. SYWV is a radio frequency transmission line with physical foam insulation. For cable TV.

The difference between RVS and RVV 2 cores: RVS is co -produced by dual -core RV cable. There is no outer cover and used for broadcast connection. The RVV 2 core wire is directly placed into a cable, with an outer sheath for power supply, control signal and other aspects.

The difference between RVV and KVV RVVP and KVVP: The lines used in RVV and RVVP are soft lines composed of multiple fine copper wires, namely RV lines. The lines used in KVV and KVVP are hard lines composed of single -strands of coarse copper wire, which is composed of BV lines.

The difference between AVVR and RVVP: AVVR refers to a cable without shielding with a wire diameter of less than 0.5mm. RVVP refers to cables with shielded shielding with a wire diameter of 0.5mm.

The difference between RVS and RVV 2 cores: RVS is co -produced by dual -core RV cable. There is no outer cover and used for broadcast connection. The RVV 2 core wire is directly placed into a cable, with an outer sheath for power supply, control signal and other aspects.

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