How to wire the cables for a security camera

Security cameras need two types of cables to operate, a power cable and a video cable. Wireless security cameras do not require a video cable but a power cable. The power cable carries 12 volts in direct current, low voltage power from the transformer, which is connected to an output of 110 volts of alternating current, to the camera. This cable has two 18 gauge wires, one positive and one negative, both inside the same sheath. The negative cable is marked with a white or black stripe. The video cable is of type RG-59: coaxial cable that is shielded and requires BNC type connectors to protect the integrity of the video signal that is transmitted.


Power cord

  1. Use your knife or cable cutter to separate the two insulated wires from each other approximately three inches (7.6 cm) from the cut end of the cable, leaving the insulation intact on both cables. Usually you can manually separate the cables. Do this at the two ends you want to splice. Now you should have two power cords, each with two insulated wires coming out of each which in total gives four wires to splice.
  2. Remove half an inch of insulation (1.20 cm) from each end of the four wires.
  3. Splice both power cords, using the wire nuts, twisting the exposed copper ends together making sure that you twist the positive wire from one wire to the positive wire from the other wire and the negative wire, or wire from one wire to the negative wire from the other wire cable. Screw a wire nut onto the positive threaded wires and a second wire nut for the negative threaded wires. Place the wire nuts against the wire and wrap everything with electrical tape.
  4. Splice both power cables, using the butt connectors, preparing the wires just as it was done with the splice of the wire nuts, only without screwing them. Insert the exposed positive copper wire into one end of the butt connector and crimp that end of the connector. Insert the other positive wire on the other end of the same stop connector and grease it. Do the same for the two negative wires using the second stop connector. Wrap everything with electrician’s electrical tape.

Video cable

  1. Look at the end of the RG-59 type cable and you’ll see four separate parts that make up the cable. In the center is the copper conductor cable. Surrounding the central conductor wire is a white polyurethane insulation. Next is the aluminum or copper braid. And finally, there is the external cover of the cable. As you prepare this cable for BNC type connectors it is important that you prepare each of these four separate parts independently of each one. The central copper conductor should be kept separate from the braid.
  2. Take the crimping tube from the BNC type connectors and hold it next to the end of the RG-59 type cable to measure your first cut. The crimping tube will have one part with a large diameter and another with a smaller diameter. The part with the largest diameter is the part of the crimping tube that you want to join with the end of the RG-59 type cable.
  3. Mark, or just identify, the coverage on the cable where the large part of the crimping tube ends and the small part begins. This will be about 3/8 or ½ inch (1 cm or 1.2 cm) from the end of the cable. The measurement depends on the length of the long part of the crimping tube you purchased with the BNC type connectors.
  4. Cut and remove the outer cover only by touching it with the knife or using a cable cutter. Be very careful not to damage the aluminum braid that is just below the outer covering.
  5. Unravel the exposed aluminum braid so you can separate it from the polyurethane insulation that surrounds the central copper conductor.
  6. Cuts and separates the polyurethane insulation from the copper core conductor. You can cut it with a knife or using a cable cutter and it should be safari towards the end of the central conductor. Now the cable is ready for the connector and now the cable should only have the exposed copper center conductor and the aluminum braid unwrapped on the external cover.
  7. First slide the crimping tube over the cable with the small end. Before you can slide the crimping tube, you must pull the aluminum braid towards the end of the cable so that the crimping tube can surround and slide directly over the external cable sheath.
  8. Slide the BNC type connector into place, first the small end, with the copper center conductor and the polyurethane insulation going inside the small part of the connector and the aluminum braid and the outer cover staying outside the small part the connector. While pushing the connector on the cable pull the aluminum braid inside the outer cover at the same time. Go inside the connector and make sure that nothing of the aluminum braid has been inadvertently left inside the connector and possibly touching the center conductor. If the aluminum braid is touching the center conductor the connection will not work.
  9. Slide the crimping tube into the outer cover until it is touching the BNC connector. Use your crimping tool to crimp the larger portion of the crimping tube and complete compression fitting of the BNC connector.
  10. When you have completed this you must have two pieces of video cable with a BNC connector in each piece. Use the BNC conceiver barrel to connect these BNC connectors. Now the video cable splice is complete.