Integrated Cabling Level Subsystem

The horizontal wiring subsystem refers to the cable portion of the Communication intermediate crossover wiring device which connects the management subsystem starting from the information point of the subsystem of the work area. Due to the requirements of intelligent buildings for communication systems, communication systems need to be designed to be easy to maintain, replace, and move configuration structures to suit the needs of communication systems and equipment for future development. The horizontal wiring subsystem is distributed in every corner of the intelligent building, and most of the communication cables are included in this subsystem. Compared with the vertical trunk subsystem, the horizontal wiring subsystem is generally installed very concealed. After the completion of the intelligent building, the subsystem is difficult to approach, so the cost of replacing and maintaining the horizontal cable is very high, technical requirements are very high. If we regularly maintain and replace the horizontal cable, it will disturb the normal work of the users in the building, serious people will interrupt the user's communication system. This shows that the horizontal wiring subsystem of pipeline laying, cable selection will become an important part of the integrated wiring system. Therefore, electrical engineers should grasp the basic knowledge of the integrated wiring system, from the construction drawings to understand the intention of the designer, and from a practical point of view for the user, reduce or eliminate future users of the horizontal wiring subsystem changes, this is very important.

1. Horizontal wiring subsystem in the construction before the preparation

Horizontal wiring subsystem of the horizontal pipeline in the integrated wiring system accounted for the largest proportion, if with other professional pipe improper treatment, will bring great inconvenience to the electrical construction, the horizontal wiring subsystem pipeline in the pre-burying, electrical engineers should carefully prepare drawings triage work, and to the workers do a good job of technical disclosure, As far as possible to avoid overlapping with other professional pipelines, there are contradictions. AutoCAD can be used to draw three-dimensional drawings, in the drawings on the drawing of other professional lines to indicate the direction, elevation and various types of piping specifications, to develop the optimal laying of the pipeline construction plan to meet the pipe line by the shortest, easy to install the requirements. At present horizontal wiring has three kinds of methods: steel pipe Dark laying method, the ceiling to walk the groove, the line trough to the information point uses the steel pipe connection method, the ground line trough dark laying method, in which the ground line trough dark laying method applies to the more upscale intelligence mansion. In the building, the information points are dense, large bays need to be cut off office space, it is characterized by large investment, high technology requirements, construction is more difficult. ---http://bianceng.cn (computer science)

2. The ground metal wire trough in the construction should pay attention to the question

Ground metal wire slot wiring is to apply the intelligent building weak current system is increasingly complex, the outlet position changes, and the introduction of a new type of wiring. The ground metal wire groove divides into single trough, double trough, three trough and four groove, the specification has 50x25, 70x25, 100x25, 125x25. When laying the ground metal wire groove, the electrical speciality should cooperate closely with the civil engineering profession, combine the position of the outlet of the construction drawing, the direction of the line groove, and determine the position of the distribution box. Line Groove in the intersection, turn or branch should be set up a junction box, the length of the line slot more than 6 meters, should add a line box. Equipment wiring racks, hubs, distribution boxes and other equipment to lead to the line groove, with a terminal deformation connector with the wire groove connection. The wire groove is provided with a fixed bracket and an adjustment support at 2 m intervals, and is connected with the reinforcement to prevent displacement, as shown in Figure 2. The protective layer of the groove should reach above 35mm, the whole adjustment should be made after the wire groove is connected, please check the leveling instrument, strictly forbid the ground line trough exceeding high. The connector, the junction box, the line Groove Interface application seals the seal to be good, prevents the mortar to penetrate the corrosion groove inner wall. In the process of connecting the groove, the outlet, the junction box should be added waterproof protection cover, when the concrete strength of the bottom plate reaches 50%, remove the protective cover and replace the logo cover. In the construction, the worker applies the steel file to the metal wire groove burr file flat, otherwise will scratch the twisted pair the outer skin, causes the system anti-jamming, the data confidentiality, the transmission speed reduces, even causes the system not to be able smoothly to open.

3. Horizontal wiring subsystem to the grounding requirements

When the integrated wiring system adopts the shielding measure, it should ensure that there is a good grounding system, the grounding body can be set separately, the grounding resistance is ≤4ω, and the grounding resistance ≤1ω when the joint grounding body is used. The shielding layer used in the integrated wiring system must maintain continuity and ensure the relative position of the cable is unchanged, and the wiring equipment end of the shielding layer should be grounded. Each layer wiring frame should be routed to the grounding body separately, the grounding of information socket is connected with the cable shielding layer and the floor distribution frame, and the metal shell of the workstation weak equipment is connected with the special grounding body separately. When the steel pipe or metal bridge is used to lay the cable, a reliable connection between the steel pipe, the bridge frame, the steel pipe and the bridge frame should be done, and the grounding wire should be done. Integrated wiring system related to the active equipment of the positive or metal casing, the main cable shielding layer should be grounded. If the same layer has a uniform pressure ring (above 30 meters and above, each layer should be set), should be connected with it, so that the entire building grounding system composed of a cage-type pressure net. Good grounding can prevent the damage of weak current equipment by abrupt voltage shock, and reduce the influence of electromagnetic interference on the transmission rate of communication.

4. The topological structure of the horizontal wiring subsystem

The star structure is the most common topological structure of the horizontal cabling subsystem, each of which must be connected by a separate cable to the management subsystem's wiring frame, each of which has a communication wiring between each of the floor's work area services. In order for each device to be connected to a star-structured cabling system, an external adapter can be used at the information point to help improve the flexibility of the horizontal cabling subsystem.

5. Distance limit of horizontal wiring subsystem

The horizontal wiring subsystem requires a distance range of 90m, which refers to the actual length of the information point from the wiring frame between the floor lines to the workspace. Other cables related to the horizontal cabling subsystem, including the jumper on the wiring frame and the wiring of the work area should not exceed 90m in total. General requirements jumper length is less than 6m, the length of information line is less than 3m.