Do-it-yourself video surveillance system installation. Part IV
It’s good if you are a person who calculates all moves in advance. And if you are like everyone else and remember about the wires for the video intercom, security alarm and video surveillance system at the last moment, when the house is already occupied, the furniture is arranged and sitting on the sofa, you remember that something is missing?
But there is not enough information about what is happening on the site, what kind of car is parked in front of the house. Therefore, we again remember about our system, especially since the cameras have been selected, installation locations have been determined, and the next step is shopping again.
The question arises — why couldn’t you buy everything at once? But because the locations for installing the cameras have not yet been determined. Accordingly, the cable lengths are the same (why buy extra or run for the missing one again).
So, we take a tape measure and a sheet of paper in our hands, although it is advisable to take a house project instead of the latter; by the way, there should be electrical wiring diagrams there, so as not to accidentally drill it. And we begin to lay a route from each video camera to the place where the central unit or video recorder will be installed.
This is a painstaking task, but as experience shows, it’s better to spend half a day just walking, as it may seem from the outside, and then do everything very quickly, according to a proven method, than to think for a long time about how to do it every time you bump into an obstacle. get around it. There is a saving not only of time, but also a reduction in the unnecessary number of drilled holes, damaged wallpaper and baseboards.
So, the routes have been laid, the footage has been calculated, the only thing left is to decide for yourself from an aesthetic point of view where to hide the wire.
There are several options:
— lay it openly, securing it with mounting brackets;
-laying in a cable — a channel of the appropriate cross-section (managers will help you choose the cross-section if you tell us how much and what kind of cable will be there);
— lay in plastic corrugated pipes or smooth pipes, in the latter case using appropriate fittings, corner brackets, etc.;
— and of course the ideal option if the wiring is done openly, without particularly worrying about aesthetics, before carrying out plastering work. At the same time, I strongly recommend photographing all the stages, so that later you don’t have to remember how the cable goes and whether it is possible to hammer a nail into this place for the picture.
And now you can go directly to the purchase of cable products and here you will need the advice of a manager.
Although everything is simple here.
Video surveillance systems use radio frequency cable type RK-75, and all its derivatives, which differ in both technology and name.
One thing to remember is that the more copper a cable contains, the better the signal it can transmit over a greater distance. It is not recommended to use a cable with aluminum foil and steel braiding; it is intended for transmitting RF signals. Let me make a reservation right away: a good cable is always expensive (copper is always at a premium). The central core is better if it is in the form of a mono core.
Now about the power supply for the cameras. Most often, the power supply for all video cameras is 12 volts DC, and consumption can reach up to 0.8 — 1.0 A at night (this is in the case of using cameras with powerful IR illumination). For power supply, a ShVVP type cable with a cross section of 2×0.75 is usually used. If you lay the cable in one line (like beads on a string), then cable savings are possible.
If such installation is not possible, a “star” cable laying scheme is used, when a power cable is laid in parallel from each camera (similar to laying a video cable).
Thus, we laid a couple of cables — a radio frequency cable and a power cable.
Let’s take a break and start thinking about the video recording system.
Related links:
Installation DIY video surveillance systems. Part I
Installing a video surveillance system with your own hands. Part II
Installing a video surveillance system with your own hands. Part III