There are different indicators that affect the effectiveness of a video surveillance system. Today let’s talk about the voltage drop in the cable line of CCTV equipment. How to determine the voltage drop on the camera resistance? What do you need to do to reduce the risk of voltage drop? Read the answers in this article.
The length of wire from the CCTV camera to the DVR affects voltage quality. A long cable reduces the voltage. The voltage drop has two significant disadvantages:
The increase in voltage consumption depends on the increase in resistance of the camera. When the voltage drops, it causes an increase in power consumption.
The article “Can video cameras work without electricity? Top 3 Solutions” might be informative for you.
When choosing video surveillance equipment, consider the importance of selecting the right cable. Wire specifications from the manufacturer can help determine the resistance of your cable.
The voltage drop in the cable is affected by the resistance. This is clearly seen in the formula:
U of the cable = I of the camera * R of the cable, where
R – resistivity, ohm/m;
U – voltage, V;
I – power consumption, mA.
To calculate the resistivity of the cable, use the following expression:
R=p*L/S, where
S – wire cross-section, sq.mm.
L – length of wire, m;
p – conductor resistivity.
From the formula, you can see that thin and long wire gives more resistance. Selecting the wiring according to the optimal cross-section will keep the voltage in it.
First of all, the voltage is affected by the connection of the infrared illumination. The resistance in the mains changes. This in turn affects the resistance of the video camera. Each camera has a different voltage level. The surveillance camera starts to consume more power, thereby reducing the cable voltage. And this lasts until the minimum voltage is reached on the camera.
Determining the optimal voltage value for the power supply and observing this indicator in the system operation will allow the camera to switch easily from the night mode to the day mode. The calculated voltage reading will be retained and the quality of the video surveillance will not deteriorate.
There are three ways to counteract or avoid voltage drops in the cable:
Read the article “Complete list of expenses for home video surveillance“.
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