Video surveillance cable review.
When creating a high-quality and reliable video surveillance system, it is necessary to take into account all the nuances of the further operation of the equipment.
Video surveillance cable is of great importance, since the image quality will largely depend on this device.
Twisted pair and video surveillance cable are used to ensure image quality control.
The constituent elements of this device are two cylindrical conductors coaxially inserted into each other.
A video surveillance cable uses a central copper conductor covered with a plastic insulating material, over which there is a second conductor consisting of a copper braid or aluminum foil with a braid of copper wires covered with a material that insulates from the external environment.
Modern video surveillance cable has an internal conductor made of copper-plated steel, an internal dielectric made of foamed polyethylene, and shielding with foil and steel braid.
Depending on the manufacturer, the cable for video surveillance systems may have two layers of foil with a steel braid between them.
Due to the coincidence of the centers of both conductors, there are practically no radiation losses; at the same time, good protection from external electromagnetic interference is provided.
The video surveillance cable ensures data transmission over long distances.
Radio frequency cable with a single-wire copper inner conductor with solid polyethylene insulation and an outer conductor consisting of longitudinally laid aluminized lavsan and braided copper tinned wire, a sheath made of white PVC plastic.
The cable is designed to transmit television signals in terrestrial, cable and satellite television systems, video surveillance systems.
In general, the types of cables for video surveillance can be presented in the following classification:
1. FTP twisted pair cable
For cable routes running at a distance of 30 cm or more from electrical wiring, a twisted pair cable for external installation will be appropriate. This cable transmits not only the video signal, but also 12V power for micro video cameras. Thus, by connecting these cameras, you can save on an additional power cable. This cable can be used for outdoor video surveillance.
2. RG6 coaxial cable
If the electrical cable passes close to the video surveillance lines, the signal from the cameras may be distorted. In this case, it is better to use a coaxial cable (RG-6 and its analogues), since it is less sensitive to electrical network interference. The coaxial cable is laid together with the SHVVP cable, which is used to supply power to the video surveillance camera.
3. SHVVP cable. Power supply wire.
This type of placement is often found in industrial buildings, where there may be no other option for laying the cable. The influence of the electric field will be very high, which will greatly affect the quality of the signal even when using coaxial cable. In this case, we “hide” the cable route in a corrugated pipe or metal sleeve of the appropriate diameter.
4. Combined cable for video surveillance
The combined cable for video surveillance is intended for transmitting video signals in video surveillance systems with simultaneous power supply connection.
The distinctive design feature of the device is that the combined cable for video surveillance consists of a radio frequency cable RK and power supply cores, united by a single sheath made of polyvinyl chloride plastic for internal installation and of light-stabilized polyethylene — for external installation.
The combined cable for video surveillance is also different in that when connecting it, there is no need to pull 2 cables of different purposes into a corrugated pipe: a radio frequency cable for video surveillance and a cable for powering surveillance cameras.
Time labor costs are reduced by half.
The supplied power wires, as a rule, should be selected with a cross-section of 0.5 sq. mm. or 0.75 sq.mm.
The operating voltage of the cable's conductive core does not exceed 600 V.
The combined cable for video surveillance has a variable range of operating temperatures, depending on its sheath.
Thus, with a PVC sheath, the range is from -30 °C to +50 °C, and with a PE sheath from -40 °C to +60 °C.
The cable for video surveillance systems is characterized by resistance to flammable liquids, such as gasoline, and to many other negative external factors, which guarantees its long service life.