With the development of society, the expansion of cities, the construction of transportation systems, and the construction of new buildings, the application of security monitoring systems has received more and more attention. After many things happen, it is always necessary to monitor the records to explain the problems. It is also often able to deter criminals from eliminating illegal crimes. Therefore, the necessity of security monitoring system in our daily life is more and more prominent, and the reasonable and reliable installation of materials and equipment in the security monitoring system has become the primary condition for ensuring the normal function of the system.
First, the wiring skills need
The security monitoring system wiring should not only be satisfied with the needs of the data target, but also be reasonable, safe and solid, and rigorous when the circuit is laid. Their skills need to be as follows:
1. The additional voltage of the wire should be greater than the operating voltage of the line. The insulation of the wire should conform to the device method of the line and the environmental conditions of the laying. The cross-sectional area of ​​the wire should be satisfactory for the power supply and mechanical strength.
2. When wiring, try to prevent the wire from having a joint. Unless it is not possible to use a joint, it is necessary to use crimping or welding for the joint. The joints and branches of the wire should not be subjected to mechanical force. The wires that are worn inside the pipe must not have a joint under any conditions. If necessary, connect the connector to the terminal block in the junction box.
3. The device that is wired in the building should be level or straight. The wiring should be sleeved for maintenance (PVC pipe or galvanized steel pipe, which can be selected according to the skill of the indoor pipe). The metal wire hose can be used for the ceiling wiring.
4. The signal line cannot be parallel to the high-power power line, and it cannot be worn in the same tube. If the environment is limited, parallel lines should be taken. The distance between the two lines should be more than 50cm.
5. The communication 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 device that communicates the power line should conform to the electrical device specifications.
6. The alarm control box to the ceiling should be buried in the wall or galvanized steel pipe to maintain the anti-damage function of the system.
Second, the skill needs of piping
1. There are two types of line pipe wiring: bright and vertical: the pipe needs to be horizontal and vertical, and the pipe is required to be straight and straight; the pipe needs to be short, dredging and less elbow.
2. According to the design drawing, select the pipe type and standard. If there is no specific need, it can be selected according to the total area of ​​the wire worn in the line pipe (with the outer skin) and not exceeding the limit of 70% of the cross-sectional area of ​​the pipe.
3, in order to facilitate pipe threading and repair, when the length of the pipeline exceeds the following values, the center should be equipped with a junction box or cable box, the orientation should be easy to thread:
a, the length of the pipe exceeds 40 meters, no twists and turns;
b. Each time exceeds 25 meters in length, there is a bend;
c. Each length exceeds 15 meters, there are two bends;
d. Each time exceeds 10 meters in length, there are three bends.
4. Fixation of the line pipe: The line pipe should be fixed at the turn or at intervals of 1.5 meters.
5. The zigzag radius of the cable conduit should conform to the rule of the radius of the cable that is threaded into the cable (the nature and variety of the cable need to be different).
6. The wire tube used has no blisters, cracks and large deformation, and the inner wall of the pipe is lubricated without burrs to prevent cable damage.
7. The connection of the line pipe is selected by crimping or topping the pipe joint.
8. Vertically lay the wire tube. According to the size of the cross section of the wire, add a fixed threaded junction box (pull box) every 10 meters, and fix the wire in the box with the insulated wire clamp. The thicker the wire, the shorter the spacing between the fixed points.
The circuit group provides the overall service equipment for a certain load source group, such as trunk line, switching device, control system, etc. The basic research content of the traffic theory is to study the relationship among the traffic volume, call loss and the capacity of the harness. Therefore, the harness is an important basic concept in the traffic theory.
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