How to Wire a 12V DC Security Camera

Written by tony breedlove
  • Share
  • Tweet
  • Share
  • Email

With a few tools and some easily acquired skills, you can wire 12V DC security cameras. CCTV (closed circuit television) cameras are being sold at record rates and many people are realising they can install their own cameras and save money. Security cameras require three wires to operate; a positive 12V DC, a ground and the camera signal. The voltage is delivered through red and black wires and the signal is transmitted through RG-59 coax. The easiest way to wire 12V DC security cameras is to use a Siamese cable, which combines the coax and the wires to power the camera. The camera will come with a power supply and a connector to plug into the camera, the power supply wire will be cut in half and the Siamese cable wired between the two pieces to deliver the power and signal.

Skill level:
Moderately Challenging

Other People Are Reading

Things you need

  • RG-59 BNC connectors
  • RG-59 crimping tool
  • RG-59 Stripping tool
  • RG-59 Siamese wire
  • BNC barrel
  • Standard wire crimp tool
  • 22-16 AWG insulated butt splice connectors
  • Electrical tape
  • Wire cutters

Show MoreHide


  1. 1

    Cut the power supply cord in half and splice the Siamese cable in the middle using the butt splice connectors. Wrap all four butt splice connectors and wire with electrical tape to protect the connectors and wire from moisture.

  2. 2

    Strip each end of the Siamese coax cable with the RG-59 Stripping tool and install a BNC (British Naval Connector) on each end of the Siamese RG-59 cable using the RG-59 crimping tool (follow the connector manufacturer's specifications).

  3. 3

    Plug the camera coax into the BNC barrel and the barrel into one end of the Siamese coax. Wrap the barrel and connectors with electrical tape to keep moisture out.

  4. 4

    Plug in the power supply and plug the other end of the Siamese cable into your DVR (digital video recorder).

Tips and warnings

  • There are many videos on YouTube which will help you become familiar with installing BNC connectors. You should practice installing BNC connectors on a few connectors to learn the process. After you have acquired the skill you will be able to easily install connectors which will work properly.
  • Several types of BNC connectors are manufactured; you must use a crimping tool which will work with the type of connector you purchase. You should not use twist-on BNC connectors; you will not have a professional installation due to the high failure rate of this type of connector. Additionally, you should not use wire nuts instead of insulated butt splice connectors because they, too, have a very high failure rate. The power supply which came with your camera includes a cord with two wires in it; this wire must be cut in half. One of these wires is a positive voltage and the other is ground. Make sure you connect the wires correctly. One of the power supply wires will be marked with a stripe or a ridge on it; connect the marked wire to the red wire on the Siamese cable and the unmarked wire to the black Siamese wire.

Don't Miss

  • All types
  • Articles
  • Slideshows
  • Videos
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the site, you consent to the use of cookies. For more information, please see our Cookie policy.