Security installation standard
According to the electrical design, construction specifications, codes and standards issued by the relevant state departments in recent years, in summarizing the design and construction experience of the technical defense engineering in the past few years, the new technology and new product technology combined with the development of technical defense technology Requirements, in line with the purpose of serving the society and the user first, the following standards are formulated.
Indoor wiring
Indoor wiring is not only required to be safe and reliable, but also to make the line layout reasonable, tidy and securely installed. The technical requirements are as follows:
When using a wire, the rated voltage should be greater than the working voltage of the line; the insulation of the wire should be in accordance with the installation method of the line and the environmental conditions of the laying. The cross-sectional area of ​​the wire should meet the requirements of power supply and mechanical strength.
When wiring, try to avoid wires with connectors. Unless the joint is not available, the joint must be crimped or welded. Wire connections and branches should not be subject to mechanical forces.
Wiring should be installed horizontally or vertically in the building. Wiring should be protected by casing (plastic or iron water pipes, according to the technical requirements of indoor wiring). Metal hoses can be used for ceiling wiring, but they must be fixed and beautiful.
The signal line cannot be parallel to the high-power power line, and it cannot be worn in the same tube. If it is limited by the environment, it is necessary to move away from the line.
The AC power supply of the alarm control box should be routed separately. It should not be placed in the same tube as the signal line and low-voltage DC power line. The installation of the AC power line should meet the electrical installation standards.
The alarm control box to the ceiling of the ceiling requires that the casing be buried in the wall or protected by an iron pipe to improve the anti-destructive performance of the anti-theft system.
Indoor piping
There are two types of line pipe wiring: bright and slow. The clear piping requires horizontal and vertical, neat and beautiful. Dark piping requires short, smooth, and low elbows.
For the selection of the line pipe, select the type and specification of the pipe according to the design drawing. If there is no regulation, it can be selected according to the total area of ​​the wire (not even skin) worn in the pipe, and not exceeding the limit of 70% of the cross-sectional area of ​​the pipe.
In order to facilitate pipe threading and maintenance, when the length of the pipeline exceeds the following values, a junction box or cable box should be installed in the middle, and the position should be convenient for threading.
(1) When the length of the pipe exceeds 40 meters, there is no bending;
(2) When the length exceeds 25 meters, there is a bend;
(3) When the length exceeds 15 meters, there are two bends;
(4) When the length exceeds 10 meters and there are three bends; the fixing of the line pipe, the line pipe at the turning point or the straight line distance should exceed the 1.5 m.
The bend radius of the wire conduit shall be in accordance with the bend radius of the cable to be penetrated.
Pipes with trachoma, cracks and large deformations are prohibited for use in wiring works.
The connection of the conduit should be connected by a sleeve or a buckle.
Vertically lay the pipe, according to the size of the cross-section of the wire, at a distance of 10-20 meters, add a fixed threaded junction box, use the insulated wire clamp to fix the wire in the box, the thicker the wire, between the fixed points The shorter the distance.
After the wire is not inserted into the vertical nozzle in the box (box), the nozzle should be sealed.
The junction box or junction box should be fixed with not less than three screws.
The connection between the junction box and the pipe should be accompanied by a cup comb.
The junction box or junction box should be covered. A branch box should be added to the branch of the line pipe.
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