First of all, we need to understand the wire used for monitoring. The common surveillance cameras are used for video and power lines. The webcam is powered by direct POE. For far away, no matter analog or network surveillance cameras, optical fiber is needed. We monitor the project mostly using single mode fiber.

下面说说各种线材。

Here are all kinds of wire.

通常模拟监控用的视频线，就是同轴电缆，用来传输模拟视频信号。型号通常有SYV75-3，SYV75-5，这两种规格线径不同，传输距离也不一样。75-3传输距离200米左右，75-5传输距离500米左右，再远的距离建议用光纤。

Usually the video line used for analog monitoring is coaxial cable, which is used to transmit analog video signals. The models usually have SYV75-3 and SYV75-5. These two specifications have different line diameters and different transmission distances. 75-3 the transmission distance is about 200 meters, the 75-5 transmission distance is about 500 meters, and the farther distance is recommended to use optical fiber.

监控使用的电源线一般使用RVV2*河北立体车库 消防报警器塑料配件 电缆接地箱 电缆保护接地箱 塑料土工格栅 消弧线圈装置 1.5，RVV2*1.0，RVV2*0.5的两芯线，RVV电线全称铜芯聚氯乙烯绝缘聚氯乙烯护套软电线,俗称软护套线，是护套线的一种。一般根据距离及功率选择电源线的线径。

The power line used for monitoring and control generally uses the two core lines of RVV2*1.5, RVV2*1.0 and RVV2*0.5, and the RVV wire is fully called the copper core PVC insulated PVC sheath soft wire, commonly known as the soft sheath line, and is a kind of sheath line. Generally choose the diameter of the power cord according to the distance and power.