Surveillance Camera Wiring Diagram

Surveillance camera wiring diagram

Surveillance Camera Wiring Diagram

Most security cameras rely on RG59 cable, composed of copper wire encased with various layers of insulation and shielding, that comes either plug and play or as bulk cable with connectors attached.

Let’s take a look at this surveillance camera wiring diagram’s color codes and their functions: Yellow is for video data transferring.


Your camera requires power in order to transmit video. In order to do this, analog, HD-SDI and HD-CVI cameras require power wires running directly from their source – which is why many professional installers prefer “Siamese Cable,” an RG59 coax cable equipped with two 18 gauge two conductor power wires built right in. This helps separate power from video transmission cables and cuts costs significantly.

If you have a multiple-camera system, a central power supply box will be necessary to power all of the cameras. This may require using an RG59 Siamese cable with a PT-4 male power cable lead attached and connecting this to a power transformer that powers each camera in your system. Some installers may opt to use individual transformers if cameras are located in hard-to-reach locations such as treetops or inside houses – this option could prove particularly helpful if your cameras cannot reach power easily.

Some camera systems may utilize Power over Ethernet (PoE), which uses one cable to carry data and power for each camera. This option can be very convenient; most network security cameras rely on PoE for power.

For non-POE camera installations, you will require running separate power cables from an outlet such as a junction box or wall outlet to each camera. To provide extra protection in remote locations, weatherproof junction boxes may also provide some relief and offer greater peace of mind for power and video connections.

Splicing power and video wires together may be possible in certain circumstances, particularly with existing wiring; however, doing so can reduce video quality significantly. If you plan to splice, we advise using a professional CCTV cable splicing kit, including high-quality splicers and heat shrink tubing.


Both analog and IP surveillance systems rely on wired connections between their cameras and recorders; with analog systems, this typically involves coaxial cables known as RG59 that transmit their signal back, while with digital cameras, this typically involves Ethernet connections powered by PoE (Power over Ethernet).

An essential factor when wiring security cameras is keeping their power and video transmission separate to avoid overpowering either one with too much energy or vice versa.

When working with an analog system, using a balun for CCTV may be best to convert the traditional coaxial cable to something capable of transmitting analog signals over longer distances. However, this issue becomes less pertinent with IP security systems since digital signals travel directly over UTP Cat5/CAT6 cables.

Siamese cables make running video and power wires simpler in your surveillance system, as these pre-made cables come in 25ft, 65ft, 100ft, or 150foot lengths with fittings for power and video already attached at one end – this makes connecting to the recorder then running wires to each camera much simpler!

When working with wires for security cameras, it is best to run them through protected areas whenever possible to help shield them from weather elements and possible tampering from humans or wildlife such as squirrels or birds. If necessary, PVC or metal conduits may help ensure your wires remain weatherproofed against possible pests like squirrels.

Surveillance Camera Wiring Diagram

Many people opt to install a junction box where their security camera wires meet the main power supply to avoid tampering with power sources. These junction boxes can be mounted anywhere on the ground, wall, or inside an attic, giving your security camera wiring an organized look.


Idealistically, running camera wire should make a single continuous run from camera to PVR or monitor. Unfortunately, however, this doesn’t always work out, and at times, you may need to extend its length, either due to not enough wire originally being available at the installation or having moved your camera or monitor into another area. When this occurs, splice wires together to obtain the desired length of cable runs.

Various wire types are used in security camera systems, each with advantages and disadvantages. If you are installing IP cameras that use home networking technology, ethernet cables must be used to connect them to your router or NVR; these thin, flexible wires make running them easy and provide fast and reliable service compared to WiFi connections which often suffer outages.

Install an analog camera system using a coaxial cable to transmit and record an analog signal digitally on a recorder. An analog security camera can also be connected directly to a monitor using an RCA connector, but for microphone support, you will require a two-lead cabling connection instead.

To properly splice a Coax RG59 cable, you must remove its outer insulation and expose its copper conductors since each wire has a distinct color-coded labeling system for easy identification by your camera microphone connectors.

Depending on your camera type, you may also require connecting power cables. In such instances, use a 2.1mm power cable splitter to divide up a pre-made audio video wire’s male plug into two female power plugs that will fit each microphone and camera connection; connect each 2.1mm power cable splitter directly to a DC power source before hooking them all up together.

Data or Control

The yellow wire on a security camera is not associated with video data transfer; rather, it connects its power transformer. If using individual power transformers for each camera (instead of using one central power supply box), they should all connect via this yellow wire to one 2.1mm female power cable lead on your DVR side that leads from PT-4 main power wire on DVR to 18/2 power cable that supplies camera(s).

Surveillance Camera Wiring Diagram tips

Blue and black wires connect your CCTV cameras and monitor for local live viewing and remote access via an app. If your camera requires sending video/audio over wired internet connectivity, an Ethernet cable must also be present that transmits both data and power.

An HDMI cable is another common form of wiring used in surveillance systems, transporting video and audio data between a camera and monitor or television for local live viewing or from DVR/NVR systems for remote access.

If you use IP cameras, Ethernet cables are typically the ideal way to establish connections between them and networks. Furthermore, these cables can even carry power for some types of IP cameras using a Power over Ethernet switch or injector that sends the appropriate voltage down the cable.

You can choose from various cables when setting up a surveillance system, each offering different advantages and disadvantages. Some types are easier to work with, while others might better suit specific applications.

Before beginning wiring, it is necessary to carefully plan out and mark out your wire running route and drill holes as per National Electric Code specifications. After completing this step, prepare pipes by burying them into PVC or metal conduit pipe (at least 18″ of PVC should be covered and 6″ for metal conduit). Following that, run wires and mount cameras – when installing outdoor cameras, it may also require installing a junction box to protect from harsh weather and vandalism conditions.

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