It’s possible to run power longer distances if you use thicker gauge cable. The power cable and the power supply (12V DC/24V AC) Like DC, multi-camera 24V AC power supply boxes and individual 24V AC power transformers are available. The advantage of using AC vs DC is that the power cable can be run much longer distances without power drop with AC. Many higher end commercial grade cameras come in dual voltage, which allows installers to use a 12V DC or 24V AC power supply accordingly to the installation job They usually come with an individual 12V DC power supply or can use a multi-camera power supply box. Nowadays most of the CCTV and HD over coax cameras use 12V DC. Problems can also include hum bars, video distortion, and other symptoms which are often mistaken as a bad camera Trying to power a 1.2A camera with 12V DC over a long distance is unfeasible as there will be too much total resistance in the long cable run that adds up to a substantial voltage drop resulting in camera failure.Ī common problem attributed to voltage drop is where the security camera works fine when there is low consumption but at night, when the IR LEDs turn on, it stops working completely. Things like mechanical filters, infrared IR LEDs, and internal heaters will increase this number and eventually it gets closer to 1-1.5 Amps. Usually, the camera’s power consumption is generally around 200-400mA. Using 12V DC power supply the cable can run up to 300 feet at max.Ī security camera’s power consumption is usually referred to in milliamps (mA). Using a 24V AC power supply and 18/2 gauge the power can run up to 750 feet without any current drop. However, the main difference is how these power supplies can power up a security camera. Let’s start by noting that neither of these two voltages affect the video transmission, only the power.
However, there are security cameras that take dual voltage 24V AC and 12V DC. The analog security cameras use siamese coaxial cable which, a pair of wires consisting of coaxial cable 75OHMs and 2/18 gauge power wire. Nowadays the majority of HD analog security cameras (such as HD-TVI, HD-CVI, AHD, CVBS) require 12V DC power supply. Traditionally, CCTV security cameras were 24V AC, but around 2005 the 12V DC cameras started to become popular due to their low cost. In this article, we will discuss the differences between 12V DC and 24V AC power sources in security camera systems. There are length limits for both the coax video cable and the power cable. In CCTV camera systems, the distance how far you can run the security cameras depends how far you can run the power cables.
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