This article summarizes some acceptance criteria for weak cabling systems for integrated cabling and hopes to help everyone.
I. General requirements
1. When wiring, the colors of the phase line and neutral line should be different; the phase line (L) color should be the same for the same room or equipment, the neutral line (N) should be blue, the protection line (PE) must use the yellow-green color line. The overcurrent general copper core wire is 6A/square, and the aluminum core wire is: 3A/square. Calculate the thickness of the power supply cable can be calculated according to this standard.
2. The resistance between the wires and between the wires and the ground must be greater than 0.5MΩ.
3, all the lines must be worn through the pipe or cable trough, inconvenient for the pipe or cable trough should be given to take appropriate protective measures, and cabling to be beautiful, flat and straight, labor and solid.
4. The utilization of the diameter of the straight pipe should be 50%~60%, and the utilization of the diameter of the elbow should be 40%~50%.
5. If there is a local interference source on the route, and the minimum net distance requirement cannot be met, the steel pipe shall be used.
6. If the length of the pipe is longer than 30 meters, a crossover box shall be installed in the middle.
7. When the dark pipe must be bent and laid, the route length should be ≤ 15 meters, and there should be no S bend in this section. If more than 2 consecutive bends are made, a cable box shall be installed. All bends are completed with a pipe bender, which is the standard turning radius. The three links and four links that are prohibited by the state shall not be used.
8. The radius of bending of the blind pipe must not be less than 6 to 10 times the outside diameter of the pipe. The optical cable should not be less than 10-15 times of the pipe diameter and the cable tail must be wrapped with electrical tape.
9, in the dark pipe hole must not have a variety of cable connectors.
10. When the power cord is wired, the cross-sectional area of ​​the conductor used should meet the maximum output power of the equipment.
11. The parallel distance between electric wires and heating, hot water and gas pipes should not be less than 300mm, and the distance between them should not be less than 100mm.
12. The joints that penetrate the pipe wires shall be located in the junction box. The joints shall be firmly connected. The tin shall be covered with insulating tape and shall be uniformly and tightly packed.
13, the cassette should be installed screw to protect the line.
14. The reserved length of optical fiber cable equipment is generally less than 5-10 meters, and the reserved length of video cable to the camera is not less than 60CM-100CM.
Second, the main material quality requirements
1. The specifications and models of split equipment and equipment shall comply with the design requirements and the relevant provisions of the current national electrical product standards.
1 Power cord: According to national standards, a single electrical branch, switch line with a standard 1.5 square millimeter line, the main line with a standard 2.5 square millimeter line; air conditioning socket with 4 mm square line;
2 background music line: standard 2 x 0.3 square millimeter line
3 surround sound cable: standard 100-300 core oxygen-free copper
4 video lines: no less than 75-4 standard
5 network cable: UTP UTP UTP
6 Cable TV Line: 75 Ohm Broadband Coaxial Cable
7 Anti-theft and other control lines: RVV 4 x 0.5 square millimeters
2, equipment and equipment packaging should be intact, the material appearance should not be damaged, accessories, spare parts should be complete.
3, plastic wire protection tube and junction box, all kinds of information panels must be flame-retardant products, the appearance should not be damaged and deformed.
5, outdoor equipment must be connected to the cable from the bottom of the device
6, metal wire protection tube and junction box appearance should not be folded flat and cracks, the tube should be no burr, nozzle should be flat.
7. The terminal box, junction box and switch and socket of the distribution system used in the communication system are selected to match the equipment.
8, the installation of power
1 Power socket spacing not more than 3m, no more than 1.5m from the doorway, 30cm from the ground
2 All sockets from the ground 30cm
3 The switch is installed at a distance of 1.2~1.4m from the ground and 0.15~0.2m away from the door frame.
9. When the power cord is wired, the cross-sectional area of ​​the conductor used should meet the maximum output power of the power equipment.
10. The length of the cassette terminal shall be 30 centimeters long. All lines shall be labeled and indicate the type, specification, date and person responsible for the project.
11. The connection between the threading tube and the film box, the film box must not be cut, and the original tube hole must be opened to thread the threading tube. The thread tube remains 5 mm in the cassette.
12, the dark line laying must be piped.
13. The power line and communication line must not penetrate the same pipe.
14. The horizontal distance between power cords and sockets and TV lines, network cables, audio and video cables and sockets should not be less than 500mm.
15. The joints that lead into the pipe wires should be located in the junction box. The joints should be firmly connected. The insulation tape should be evenly wrapped and the height of the cassette should be determined: The height of the cassette is the same as the original strong electric socket. Background music
The height of the tuning switch should be the same as the height of the original strong switch. If there are multiple cassettes together, the distance between the cassettes is at least 10mm.
16, appearance requirements of the trough: horizontal and vertical, uniform size.
17. Fixation of trunking
1 ground PVC pipe requires a fixed interval of one meter;
Two-slot PVC pipe requires two meters per interval must be fixed;
3 Wall grooved PVC pipe must be fixed at intervals of one meter.
Part II Acceptance Standards for Video Surveillance System
First, the selection of equipment, components, and materials of the system should meet the following requirements:
1 It should adopt styling products that comply with current national and industry related standards;
2 The video input and output impedance of the equipment and components used in the system and the characteristic impedance of the cable shall be 75Ω, audio
The input and output impedance of the equipment should be high impedance or 600Ω;
3 The performance and technical requirements of various ancillary equipment selected by the system shall be consistent and consistent with the quotation.
4 Image quality can be assessed in a five-level injury system, and the image quality should not be less than 4 points (see the attached table for details)
5 the level of image definition black and white television system should not be less than 400 lines, color television system should not be less than 270 lines;
Second, the design of the system should be based on the following factors:
1, according to the system's technical and functional requirements, determine the system composition and equipment configuration;
2, according to the construction plane or site survey, determine the location of the camera and other equipment;
3, according to the monitoring objectives and the conditions of the environment, determine the camera type and protective measures;
4. Determine the route of the transmission cable according to the camera distribution and environmental conditions.
Third, the camera setting position, camera direction and lighting conditions should meet the following requirements:
1. The camera should be installed near the monitoring target where it is not easily damaged by the outside. The installation location should not affect the on-site equipment operation and normal personnel activities. The height of the installation should be 2.5 to 5 meters from the ground in the room; 3.5 to 10 meters from the ground in the room and not less than 3.5 meters from the ground.
2. The cameras in the elevator car should be installed at the top of the elevator car and at the opposite corners of the elevator operator and should be able to monitor the panorama in the elevator car.
3, the camera lens should avoid direct light, to ensure that the camera tube target surface from damage. Within the field of view of the camera, there must be no object that blocks the surveillance target.
4. The camera lens should be aligned with the monitoring target from the direction of the light source, and inspection and acceptance of the backlight installation project should be avoided: After acceptance of each project, it can be delivered for use. When the acceptance is unqualified, the design and construction unit shall return it for repair until it passes the acceptance.
The engineering acceptance of the system should include the following four aspects:
A. The quality of system engineering construction;
B. subjective assessment of system quality;
C. Objective testing of system quality;
D. Transfer of drawings and data.
Specific completion acceptance documents include:
Before the acceptance of the system project is completed, the construction unit shall compile the construction acceptance documents in duplicate according to the following contents. One of them shall be signed and sealed by the construction unit and returned to the construction unit for archiving.
1 project description;
2 comprehensive system diagram;
3 trunking, pipe wiring diagram;
4 equipment configuration diagram;
5 equipment connection system diagram;
6 equipment summary description;
7 equipment and equipment list;
8 subjective evaluation table;
9 objective test table;
10 Construction Quality Acceptance Records.
Completion acceptance documents should ensure quality, complete content, mark details, write clearly, data accurate, and correspond to each other.
After acceptance of the system engineering is passed, the acceptance team shall sign the acceptance certificate. The format of acceptance certificate should conform to the provisions of this code
Second, the quality of the system objective test
1. The objective quality test of the system should be carried out under the standard illumination of the camera. The instrument used for the test should have a measurement certificate.
2. The system definition and gray scale can be measured by comprehensive test cards. The number of random inspections should not be less than 10%, and the indicators should comply with the provisions of Article 2.1.6 of this specification.
3. When there is controversy about the subjective evaluation grading, the instrument can be used to test the random SNR of the system and the interference of various signals.
4, the system's various functions should be tested, its functional indicators should meet the design requirements. The function test of the contractor is performed as shown in the table below.
Raw material is hot-rolled round steel, which is forged by air hammer and heat-treated to become a high-quality Grinding Ball. The Forged Steel Ball has high volume hardness, compact structure, fine grain and good wear resistance. Due to the stable quality of the raw materials, the impact toughness is as high as 12-15 J/cm2, and the breaking rate is less than 1%. Especially the large-diameter Steel Ball has the advantage that the cast steel ball cannot be achieved in the SAG mill.