When it comes to setting up a surveillance system, selecting the appropriate power source and cables can be a challenge for beginners. The proper power supply for cameras is essential to ensure the reliable operation of surveillance equipment. In this article, we will explore the importance of efficient power distribution and the selection of power cables for video surveillance systems, with a focus on the perspective of the OHWOAI brand.
Power Source Configuration:
The placement of power sources for cameras depends on whether the cameras are located near the control host or at a considerable distance. For cameras located nearby, a high-power DC stabilized power supply can be installed close to the host, and multiple cameras can be connected to this power supply. The DC power supply's power should exceed the total power consumption of all connected cameras.
For cameras located far from the control host, a 220V AC power supply should be distributed to the camera's vicinity and then transformed to 12V using a stabilized power supply to provide power to the cameras. The distance between the 220V AC power supply line and the video cable should be greater than 30 centimeters to avoid magnetic interference and maintain optimal image transmission quality.
Power Source Selection:
Choosing the right power source requires careful calculation. Here are some common 12V power requirements for cameras:
Regular bullet or dome cameras: Approx. 200-300mA, suitable for 500mA-1A power supply.
Integrated cameras: Approx. 350-400mA, suitable for a 1A power supply.
Small to medium-sized infrared cameras: Approx. 600-700mA, suitable for a 1A power supply.
Large infrared cameras: Approx. 1000-1200mA, suitable for a 2A power supply.
When supplying power to a surveillance system, cameras can be powered individually or collectively. If multiple cameras are powered collectively, the required current is the sum of the currents of all the connected cameras.
Example: If a surveillance system requires 10 bullet cameras to share one power source, and each camera has a current of 300-400mA, the total current required would be 3000-4000mA. In this case, a 5A or 6A power supply should be chosen for powering the cameras collectively.
Selection of Power Cable Diameter:
When the distance between cameras and the control host is less than 40 meters, individual cameras can use RVV2×0.5 power cables to connect to the control host, and a small switch power supply can be used for each camera. If using four bullet or dome cameras, two 12V 1A power supplies or one 12V 2A power supply can be selected for all four cameras, with the cameras using parallel power connection to save on cable materials.
For larger systems with eight cameras, a high-power 12V DC stabilized power supply should be used for centralized power distribution. The power cable selected should be RVV2×0.75 for distances up to 40 meters. For systems with 16 cameras or more and with larger infrared cameras, RVV2×1.0 power cables should be considered. For longer distances, RVV2×1.5 power cables should be used for safety and to maintain proper power supply.
Power Cable Selection Method:
Option 1: Use Twisted Pair Cable for Power Supply
Non-shielded twisted pair cables of category 5 or above can be used as power cables for surveillance cameras. This simplifies wiring. However, it is essential to ensure that the transmitted power meets the equipment's requirements. For instance, if the camera's working voltage is 10-12VDC and the current is 500mA, and the twisted pair cable's internal resistance is 10Ω per 100 meters (actual measurement for 100m is 9.53Ω), the transmitted power should be within 150 meters for the devices to function correctly.
Option 2: Use Independent RVV Cable for Power Supply
Based on the cameras' power consumption, RVV2×0.5 cables are sufficient for fixed bullet cameras (10W or below) and infrared bullet cameras (20W or below). For PTZ cameras (35W or below), RVV2×0.5 cables are also suitable for distances up to 50 meters. For systems with a larger number of cameras (over 5 units) and longer distances, RVV2×1 or RVV2×1.5 power cables should be considered.
Efficient power distribution and selecting suitable power cables are crucial aspects of building a reliable surveillance system. OHWOAI brand prioritizes providing high-quality surveillance solutions that cater to various requirements and distances, ensuring that the cameras function optimally and deliver top-notch security performance.
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