15 Problems and Countermeasures of Common Weak Current Construction
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15 Problems and Countermeasures of Common Weak Current Construction
Weak current system is an indispensable part of modern buildings or communities. We will collate the problems and defects in equipment selection, construction management, and system operation and maintenance of weak current systems, and propose solutions to them, which are worthy of reference for engineers. . 
Communications, Data Networks, TV Systems 1. Bridges
Defects: The cable length in the single building bridge is not enough reserved. After the construction is completed, the bridge cover will not cover.
Analysis of the reasons: On-site construction and management are not standardized.
Preventive measures: When laying the cable, the length of the bridge should be fully considered. After the construction, the cables in the bridge should be neatly arranged and the bridge cover should be covered.
2. Telecom, Netcom pipeline
Defects: Telecom and Netcom share the bridge, but the bridge does not have the wire rack, which results in ineffective separation when the cables are laid. This causes chaos in cable emissions and causes trouble during operation.
Analysis of the reasons: The design was not in place, and the bridge was not effectively allocated during construction. The construction management was not standardized.
Precautionary measures: Cable racks are required for design, and clear assignments are made, and the distribution of the bridges on the site is identified during construction.
3. Indoor pipe
Defects: When the weak room is threaded, due to the weak current embedded pipeline, there is a case where a weak electric cable is used for the pre-embedded pipeline with strong electricity, and the strong and weak electric cables share the pipeline, causing the equipment to operate abnormally and adversely affecting the equipment.
Analysis of the causes: This phenomenon is caused by improper site construction management.
Solution: When the pipeline is pre-buried, timely check the construction quality, strengthen the construction management, rectify and dredge the weak electricity pipe, and re-thread the cable.
4. Reserve of the interface in the weak box
Defects: The weak box of a project only considers one empty box. The functional modules in the box must be purchased and installed separately, which increases the workload of project coordination and affects the appearance and installation quality.
Analysis of the reasons: The empty weak box did not carefully consider the size of the functional module and the installation method.
Preventive measures: If you need to install an empty weak box at the scene, its size must be considered to be able to meet the installation standards of the module; fine decoration is recommended to configure the finished weak box, which is not only beautiful and reasonable, more appropriate. 
The product protection <br> <br> defects: weak box construction process after installation and threading the cable exposed outside the housing, there is no protection.
Analysis of the cause: The construction of the site was improperly managed.
Remedy: When the threading is completed, the labeling should be done. The cables should be put into the box and the weak electricity box door should be closed in time to enhance the product protection and safety awareness.
6. Outdoor box
Defects: The use and management of public communications and cable television facilities are confusing.
Analysis of reasons: poorly designed and poorly managed operations.
Solution: Each subsystem is designed independently at the time of design, and management after delivery is strengthened.
7, junction box
Defects: The installation of equipment inside the box is not standardized, the wiring is messy, and the door is not closed.
Cause analysis: Construction and management are not in place.
Preventive measures: Strictly follow the rules for construction rectification, and strengthen the management of daily operations. 
Safety Precaution System 1. Penetration Wall Penetration Device
Defects: The fence-to-radio alarm device is installed on the outside of the wall, and the outside of the wall is a pedestrian path. When pedestrians stick to the wall, they often cause false alarms.
Analysis of the reasons: If an infrared alarm device is installed on the perimeter, the impact of pedestrians, trees, and trees on the system will not be taken into consideration.
Solution: If the perimeter of the apartment is equipped with a camera, the police may be monitored. If the perimeter is not equipped with a camera, the fence-to-fire alarm device should be installed on the inside and the upper side of the wall. The inner side can prevent the invasion of the fence from being invaded, and the upper side can prevent climbing, thereby solving the alarm caused by swinging of normal pedestrians or flowers and trees.
2. Alarm equipment area
Defects: Infrared fire alarms are installed on perimeters. The distance to the zone is far more than 50 meters. Once there is an alarm, it is difficult to determine the specific location of the alarm, making it difficult for the security inspection.
Analysis of the reason: When designing the distance between the perimeter infrared radiation alarm device and the perimeter, the security is not considered in the judgment of the alarm range.
Remedy: The distance of the alarm zone should not exceed 50 meters. Alarm warning lights and manual reset devices should be provided.
3. Out emergency button
Defects: There is no obvious mark on the emergency exit button of the unit's access control system or the installation location is concealed, which brings inconvenience to pedestrians.
Analysis of the reason: The location and method of installation of the emergency exit button are not considered in the design.
Solution: The location of the exit emergency button should be easy for the user to operate, and beside the obvious text logo and concise use instructions.
4. Entrance door magnetic
Defects: The magnetic line in the entrance door of the household is not embedded in place.
Analysis of the causes: The management and inspection work at the construction site is not in place.
Remedy: Reasonable piping should be embedded directly in the door frame.
Background music system outdoor speaker
Defects: A community set up background speakers between residential buildings in the park, playing background music at ordinary times, causing noise to the owners.
Analysis of reasons: The location of outdoor speakers during system design is irrational.
Solution: When designing the outdoor position of background music, it is basically set in a public place where people can stay and rest.
Monitoring Center duty room
Defects: The equipment is not well-planned, the wiring is messy, there is no line identification, the perception is not good, and it brings inconvenience and difficulty to the maintenance of the equipment.
Analysis of the reasons: System design, construction management and inspection work are not in place, and the corrective actions after acceptance are not in place.
Solution: The equipment system must be designed in accordance with the specifications. At the same time, the construction must be regulated and the signs should be regulated, and the review of construction management and acceptance should be strengthened.
Weak electricity integrated pipeline design bridge and embedded pipeline connectivity
Defects: The interface between the bridge and the embedded pipeline is not in place.
Analysis of the reasons: System design and engineering site construction management and inspection work did not do it.
Solution measures: Carefully review the construction drawings, strengthen the on-site construction management, and align the bridge with the pre-embedded pipes to ensure construction quality.
Power system weak system power supply
Defects: The video intercom and access control system equipment in a certain area is powered by the mains. When the residential area loses power, the video intercom system stops working, and the unit door lock opens automatically, causing hidden danger to the occupants' safety.
Analysis of the reasons: The system's power supply did not consider power outages.
Solution: Add battery to the doorphone unit of the intercom unit to solve the power supply problem. Weak current systems (other than communication, cable, and network public equipment) must use independent uninterruptible power supplies for power supply. The system's power supply plan must be designed and reviewed.
Lightning lightning protection grounding construction Notes 1. Weak current system grounding, according to the use of protective grounding and functional grounding. Protective grounding is divided into: anti-electrical shock grounding, lightning protection grounding, anti-static grounding and anti-corrosion grounding; functional grounding is divided into: work ground, logic ground, shield ground, and signal ground. There are different requirements for different grounding, and the grounding construction should be decided according to the design.
2. The grounding device of the weak current system that needs to be grounded should meet the following requirements:
(1) When the piping is made of galvanized electric pipe, except where the design is clearly specified, the pipe does not have to be connected after it is connected with the pipe, pipe and metal box, but the following regulations shall be observed:
1) When the pipe is threaded, the length of the pipe end thread should not be less than 1/2 of the length of the pipe joint. The thread surface should be smooth, free from rust, and be chipped. The thread should be coated with electric double grease or conductive grease. After connecting, the thread should be exposed 2~3 buckles.
2) When the pipe is connected with a sleeve with a set screw, the screw shall be tightened; in the place of vibration, the set screw shall be protected against loosening.
3) The connection between the tube and the box should not be made of plastics. Conductive metal inclusions should be used.
4) When there is a PE line in the weak current pipe, each terminal box should be connected to the PE line.
(2) When the piping is galvanized, and the design also requires that the tubes need to be bridged, the following provisions shall be observed:
1) The piping of the open-circuited pipe shall not be welded and shall be bridged by the dedicated next line clamp designated by the design.
2) The electric pipe buried or buried in the concrete shall not be bridged by a line card and may be welded and welded.
3) If there is a bare soft PE copper wire in the tube, the power tube may not be bridged. This PE line must be connected to each junction box it passes through.
(3) When black iron pipe is used for piping, if the design does not require bridging, it is not necessary to bridge. If cross-connection is required, a round steel span can be used between the black iron pipes and the black iron pipe and the junction box. The single-side welding is adopted. The span length should not be less than 6 times the diameter of the crossed round steel. The black iron pipe and plating When the zinc bridge is bridged, a copper bolt shall be welded to the end of the black iron pipe, and a copper wire of not less than 4 mm shall be connected to the galvanized bridge.
(4) When PVC is used for both strong and weak electricity, in order to avoid interference, weak-current piping should be avoided in parallel with strong-strength piping. If they must be laid in parallel, the separation distance should be more than 0.5m.
(5) When laying strong and weak electric wire troughs, strong and weak wire troughs should be separated; when laying in the same trough, strong and weak electricity should be separated by metal partitions.