BNC Cable Wiring Diagram: A Complete Guide

When it comes to CCTV installation, BNC cables are widely used to transmit video signals from cameras to recording devices. But have you ever wondered how these cables are wired and what each wire color represents? In this article, we will provide you with a complete guide to BNC cable wiring diagrams.

What is BNC Cable?

A Bayonet Neill-Concelman (BNC) connector is a type of coaxial connector that is widely used in the telecommunications industry. The BNC connector is designed to transmit high-frequency signals up to 4 GHz and is commonly used to connect coaxial cables in CCTV systems.

The BNC cable is made up of a center conductor, an insulating material, a braided shield, and an outer jacket. The center conductor carries the video signal, while the braided shield provides protection against electromagnetic interference.

Types of BNC Cable

There are two types of BNC cables: RG59 and RG6. RG59 cable is thinner and less expensive, while RG6 cable is thicker and has better shielding capabilities. RG6 cable is recommended for longer cable runs or when there is a lot of interference present.

BNC Cable Wiring Diagram

The BNC cable wiring diagram consists of two parts: the connector pinout and the cable color code. The connector pinout shows how to connect the BNC connector to the camera and the recording device. The cable color code shows what each wire color represents.

Connector Pinout

The BNC connector has two parts: the male connector and the female connector. The male connector is connected to the camera, while the female connector is connected to the recording device. The pinout for the male and female connectors is shown below:

Pin Number Male Connector Female Connector
1 Signal Signal
2 Ground Ground

As you can see from the table, pin 1 is used for the video signal, while pin 2 is used for the ground.

Cable Color Code

The cable color code for BNC cables varies depending on the manufacturer. However, the most common colors used are red, black, and yellow. The table below shows the color code for BNC cables:

Wire Color Function
Red Video Signal (+)
Black Video Signal (-)
Yellow Ground

It is important to note that not all manufacturers use the same color code. Always refer to the manufacturer’s documentation for the correct color code.


What is the maximum distance for BNC cable?

The maximum distance for BNC cable depends on the type of cable and the quality of the signal. Generally, RG59 cable can transmit signals up to 700 feet, while RG6 cable can transmit signals up to 1200 feet.

Can I use BNC cables for audio?

No, BNC cables are designed for video signals only. For audio signals, you should use a different type of cable, such as RCA or XLR cables.

What tools do I need to install BNC cables?

To install BNC cables, you will need a coaxial cable stripper, a BNC crimping tool, and a cable tester. These tools are readily available at most hardware stores and online retailers.

Can I use BNC cables for outdoor installation?

Yes, BNC cables can be used for outdoor installation. However, you should use a cable that is rated for outdoor use, such as UV-resistant and waterproof cables. Additionally, you should use weatherproof connectors and apply silicone sealant to protect the connections from moisture.

What is the difference between BNC and RCA connector?

The main differences between BNC and RCA connectors are the type of signal they transmit and their locking mechanism. BNC connectors are designed for high-frequency signals, while RCA connectors are designed for low-frequency signals like audio. BNC connectors have a bayonet-style locking mechanism, while RCA connectors have a push-in locking mechanism.


In conclusion, BNC cables are an essential component of CCTV systems. Understanding how to wire BNC cables correctly is crucial for maintaining a high-quality video signal. By following the BNC cable wiring diagram and using the correct tools, you can install a reliable CCTV system that will provide you with clear and sharp video footage.