【 Weak current College 】 weak project workflow

(A), the construction process
Construction process can be divided into four phases: the phase of construction preparation, construction, commissioning and acceptance phase. Combined with the company's actual situation, the development of this process.
1. construction preparation
1. learn and related specifications and standards
Strict compliance with building weak electricity the installation work construction and acceptance and location of the installation process standards and local authorities. This project should comply with the provisions of:
The cable television system specification (GBJ50200-94)
The General requirements of communication cable (GB/T7427-87)
The civil monitor TV closed-circuit system specification (GB50116-92)
The building and complex cabling system engineering design specifications "(CECS72-95)
The commercial building wiring standard (EAI/TIA-568A)
2. be familiar with and review drawings
Familiar with and review drawings including learning drawing, understand the drawings design intent and design content and technical conditions, after the formation of triage drawings, design, construction, construction of the three parties signature, as construction drawing of supplementary technical documentation. Check the construction and installation drawings are no contradiction and errors, clear the professional relationship between the tie.
3. the timetable for construction time
Detailed construction schedule table
4. technology gives the low-down
Clear the assume the characteristics of construction tasks, technical quality requirements, Systems Division, construction technology, construction elements and the notices, etc., be aware that in order to facilitate systematic, organized, faster task completion. The second is for engineering and technical requirements, safety measures, work procedures, preparation, etc.
5. construction budget
Construction and installation the project budget, according to the different stages of the design can be divided into: design estimates, construction drawing design budget, budget, etc.
The security and protection engineering cost estimates approach "(GA/T70-94) published by the National Ministry of public security as a public safety standards at the national launch of the reference implementation.
6. construction organization plan
2. construction stage
Coordination of civil works and other works, attention and follow its construction law.
1. reserved hole and bury pipelines and the coordination of civil works
In civil infrastructure construction, should do well grounded project leader hole, ground piping of over the wall holes, cable over the wall protection tube and into the embedded line pipe.
2. wire frame construction and civil engineering support
Trunking mechanism installation construction, civil engineering, basic and other after the end of the pipeline (wind pipe, sewerage) installed at the same time as, or slightly later than pipeline installation for a period of time, but you must resolve the power wiring duct frame and piping in space location reasonable integration and cooperation.
3. pipeline construction and decoration works with
Wiring and threading work in civil engineering is completely finished, and decorative works carried out at the same time, the schedule should be avoided since the end of the project, which resulted in the laying of the difficulties of Threading.
4. the control room arrangement and decoration works with
The control room of the decoration and the overall decoration project of synchronization, the weak electricity system equipment positioning, installation, wiring connections should be at the end of the decorative works Basic.
3. the commissioning stage
First single equipment or parts debugging, and debugging a local or regional, final overall system debugging, debugging the system type.
4. the acceptance stage
The engineering acceptance into hidden project and minute projects and completed projects in three steps
1. hidden project acceptance
Weak is the installation of line pipe embedded, buried cable, grounding, etc all have a secret project, which in the next procedure before construction, construction unit representative (or supervisor) concealed work check acceptance, and conscientiously lose good hidden works acceptance procedures into technical archives.
2. sub-item project acceptance
The end of one phase of the project, or a sub-item project completion, construction unit, in conjunction with the design units in sub-item acceptance; some individual projects from the construction units to declare local authorities for acceptance.
3. acceptance
Engineering completion approval is on the entire construction project of comprehensive check acceptance. In the project final acceptance before acceptance of construction units, check the relevant technical data, engineering, quality, and timely resolution of issues. The construction unit, in conjunction with the design and construction of the units reporting by local authorities for acceptance.

(2), construction technology
In the construction process in strict accordance with the standard for quality inspection and assessment of the quality of itemized check operation, after the completion of the construction quality assessment and quality assurance information prepared to ensure the delivery of projects to achieve the design requirements and meet the use feature.
First, the laying of electrical circuits
A £ ® general provisions
1. cable (line) in the laying of the former, do look and on-check, and DC 500V megohmmeter measure insulation resistance, its resistance is not less than 5 M Ω; when there are special provisions should be in line with its provisions.
2. line by shortest way set laying, horizontal even vertical, tidy, not paying *.
3. line should not be laying in vulnerable to mechanical damage, corrosive media releases, humid, and there is a strong magnetic field and strong electrostatic interference zone; if necessary, take appropriate measures to protect or shield.
4. When the line more than 65 ° c ambient temperature, insulation measures taken; situated may cause a fire of fire places, and fire prevention measures.
5. line is not suitable for high temperature of the parallel laying in the process equipment, piping above and corrosive liquids of process equipment, piping.
6. line and adiabatic process equipment, pipe insulation distance between the surface should be more than 200 mm, and other technological equipment, the distance between the pipe surfaceShould be greater than 150mm.
7. wiring of terminal line Department, and after the building expansion joints and settlement of every department, should have adequate redundancy.
8. line should not have intermediate connector, when you cannot avoid, should the cable box or junction box, connector in the wiring should press; when using the welding application non-corrosive of brazing. Compensating cables should press. Coaxial cable and high-frequency cable should be used for the connector.
9. the laying of the road, it is not appropriate in concrete beams and columns drill mounting holes.
10. line laying, should carry out school lines and numbers and, in accordance with the provisions of article 1, measure the insulation resistance.
11. a measuring line insulation, you must set the connected devices and components on the fracture.
B. cable laying
1. ambient temperature during laying of cable is not less than-7 ℃.
2. laying cables should be reasonable arrangements, it is not advisable to *; laying should prevent cable and cable and other hard body friction between; fixed, tension should be moderate.
3. multi-core cables, bend radius should be not less than 6 times the outer diameter.
4. signal cable (line) and the power cable should make * angles; when the parallel laying, the distance between them should be consistent with the design requirements.
5. in the same area, in the different signals, different voltage cable layout should be classified; for AC power lines and chain line, the application partition and no shielding signal line separates the laying.
6. the cable along the bracket or online tank installation should be firmly fixed in the following places:
(1) cable angled slope exceeds 45 ° or vertically, in each bracket.
(2) cable angled gradient of not more than 45 °, horizontally, at intervals of 1 ~ 2 brackets.
(3) and compensation for redundancy protection pipe on both sides and the ends of the first, second, the two brackets.
(4) the introduction of the dashboard (carton) 300 ~ 400mm before.
(5) into the junction box and line box 150 ~ 300mm before.
7. trunking vertical stratification, the cable should be installed in accordance with the following provisions order from top to bottom:
· Instrument signal lines;
· Safety chain line;
· AC and DC power supply line;
8. that the signal line and laying a strong magnetic field and strong electric electrical equipment NET distance between preferably more than 1.5m; when using shielded cables or wear metal protection hose, and online tank installation, preferably more than 0.8m.
9. cables laid in the trenches, laying in the brackets or trunking. When the cable into the buildings, the cable channel and buildings between isolation seal.
C. other requirements
· Wire worn tube before cleaning protection tube, pipe should not damage wire.
2. signal wiring, power supply lines, chain line and has the special request of instrument signal line, should adopt their own protective tube.
3. the dashboard (box) Terminal Board at both ends of the lines shall be numbered by construction drawings.
4. each of the terminals allows at most two cores received.
5. wire and Terminal plate, instrumentation, electrical equipment, etc., should have adequate redundancy.
Second, power equipment installation
A £ ® power supply system installation
1. power engineering of power supply units should check the device before installing the appearance and technology performance and meet the following requirements:
2. relay, contactor and switch should act in close contact with flexible, and no corrosion and damage.
3. a fastener, terminals should be intact and free from dirt and rust.
4. equipment accessories, performance conforms to the requirements of the installation manual.
B £ ® power equipment installation
1. equipment installation should be strong, much neater and more elegant, Terminal number, use of signs and other signs, should remain intact, writing correct clear.
2. fixation device so that the force uniform device.
3. instrument boxes installed power supply units whose bare charged body mutually or between other bare conductors between the distance shall be not less than 4mm. When unable to meet, each must be * insulation.
4. power supply box installed in the concrete wall, pole or basis should adopts expansion bolts fixed and should satisfy the following requirements:
(1) box height of Center distance ground should 1.3 ~ 1.5m;
(2) arranging installed power supply box, should be neat and tidy.
5.UPS equipment is installed, you should check the automatic switching device may *, switching time and switching voltage value should meet the design requirements.
6. the regulator should check before using their regulator, voltage fluctuations in the value should be consistent with the provisions of the installation manual.
7. Rectifier in use before checking its output voltage, the voltage value should be consistent with the operating instructions before installing.
8. power supply units with live parts and metal shell insulation resistance between, 500V megohmmeter measurement, should be not less than 5 M Ω. When the installation manual, there are special provisions should be prescribed.
9. power transmission, system all power supply switch should be in the position of the "secondary", and you should check the melting capacity of secondary device.

Third, the weak electricity system grounding
A £ ® general provisions
1. the weak electricity system grounding, by purpose have protective grounding and functional grounding. Protective earthing is divided into: shockproof grounding, lightning protection and grounding, anti-static grounding and electrical erosion grounding; functional grounding is divided into: work grounding, logic ground, screened Earth and signal ground. Different ground have different requirements, should press ground construction design decisions.
2. need a grounded weak electricity system earthing devices should meet the following requirements:
(1) when piping using electro-galvanized pipe, apart from the design clearly, tubes and pipes, tubes and metal box connection after having to crossover, but should comply with the following provisions:
1) using thread connection of the pipe, the pipe end thread length should be not less than the length of the fitting 1/2 threaded surfaces must be smooth, no corrosion, Defect, in the thread should be coated with conductive power complex full-fat or fat-corrosion. After connection, thread 2 ~ 3 should be exposed.
2) pipe using a tightening screw connections of the casing, the screws should be tightened; place in vibration, tightening screw should be loose control measures.
3) pipes and a box of the connection should not be used plastic na child should be used in conductive metal that child.
4) PE pipe has a light line, each junction box should line-connected and PE.
(2) when piping using electro-galvanized pipe, pipe design also requires crossConnect, between the need to comply with the following provisions:
1) downlead pipe should not be used for fusion welding crossover design, should be used to specify the dedicated next line clamp crossover.
2) buried or placed in concrete in tube, without applying the line card jumper, jumper can be taken for fusion welding.
3) if the tube dress with nude soft PE copper wire, electric pipe can not crossover. This line must match its PE of every connected to junction box.
(3) tubing with black mild steel pipe, if the design does not require a crossover, you do not have to crossover. If the crossover between the black and Tan tube and junction box with round steel crossover between, on one side of the weld should not be less than the length of the crossover crossover round bar diameter 6 times; black and galvanized tray cross-over between the black mild steel tube end welding a copper bolts, no less than 4mm of copper conductors are connected with galvanized cable tray.
(4) when the ELV are made from PVC pipe, to avoid interference, power piping should be avoided and the strong power piping of the parallel laying of the parallel laying, if necessary, the distance should be greater than 0.5m apart.
(5) when laying by ELV trunking, trunking to separate ELV; when it is necessary to lay down the same trunking, ELV separated metal separators between applications.
B £ ® telecom equipment grounding
1. to prevent external voltage hazards safety and damage to equipment, electrical interference suppression, and ensure the normal work of communications equipment, telecommunications equipment should be grounded in the following sections:
(1) DC power supply, telecommunication equipment rack and enclosure; standing communication cable metal sheathed and shielding layer.
(2) AC distribution panel, Rectifier screens exposed electrical power supply equipment.
(3) DC power distribution over the exposed parts of the screen.
(4) and DC-telecommunication equipment rack, machine box and rack, machine box not insulated power rectifier conductive parts of the exposure.
(5) cables, overhead lines and associated needs grounding parts, such as the arresters and surge arrester, protection gaps, etc.
2. when the low-voltage distribution system to take the TN-PAL power supply, telecommunication equipment if the requirements strictly limit the effects of power frequency AC, and telecommunications equipment are not easy to do and the stations of various gold is a component of the insulation should be used; when TN-S modulation interference requirements are not too strict, you can use TN-C format; when telecommunications equipment of leakage current in 10mA and above should be used TN-S format.
3. power distribution panel, Rectifier screens exposed reinforcement conductive parts, when the device with the frame, machine frame is connected in the electric, still need and PEN line PE lines or connected.
4. when taking IT standard power supply, telecommunication device leakage current in 10mA above, in order to avoid malfunction protection device, take the double coil power supply transformer, its primary side access IT system, secondary side in TN mode power supply, power supply equipment grounding and TN mode are the same.
5. telecommunications equipment work grounding, General requirements may be set individually and building work grounding transformers with a grounding device. However, it must be through a dedicated grounding wire insulation and earthing device connected.
6. telecommunications equipment using common grounding, the grounding resistance should not be greater than 1 Ω, expressing both cross-sectional area of not less than the copper conductor insulated wire 25mm2 wear pipe laying into common ground electrode. When using the Foundation jointly reinforced as extremely, connections should be copper, iron and transition joints.
C £ ® electronic equipment grounding
1. electronic equipment signal grounding, logical, grounding and shielding and grounding, power and protection earthing and grounding, generally share a grounding, its Earth resistance not more than 4 Ω; when electronic equipment grounding and Lmin grounding, lightning protection combined with a grounding, its Earth resistance not more than 1 Ω. Shielded grounded as a separate setting, its grounding resistance normally 30 Ω.
2. the difference of anti-interference ability, the electronic equipment and its grounding should be separate, lightning protection and earthing between distance should be more on 20m anti-interference ability strong electronic equipment, the distance between the discretion to reduce, but not less than 5 m.
When electronic equipment grounding and lightning protection and earthing using common grounding device, in order to prevent lightning strikes back and when subjected to ensure equipment safety, should be buried armored cable power supply.
3. cable shield should be grounded, to avoid interference current, the signal cable and 1MHZ and following low-frequency cable should be a little above the ground; 1MHZ, to ensure the cable shield to ground potential, should take more grounded.
4. in order to avoid the loop current, instantaneous current impact, radiating ground system should use the grounding; to eliminate the next venue of potential difference and avoid interference with each other, ring earthing system should use the equipotential; on hybrid grounding system, electronic equipment, with radiating ground within the electronic device external use ring earthing system.
5. grounding ring bus section, when electronic equipment frequency in 1MHZ above, foil 120mm×0.35mm; below the 1MHZ foil mm×0.35mm.
6. electronic equipment grounding electrodes should be laid underground levels, resulting in rake or star.
D £ ® data-processing equipment grounding
1. data-processing equipment grounding resistance is 4 Ω, AC power frequency grounding and lightning protection and earthing and grounding resistance when Ω to 1.
2. for leakage current 10mA than data-processing equipment, its host indoor metal body should be connected into one, the connector can use 6mm2 of copper conductors or 25mm×4mm
Galvanized flat steel and grounding, grounded electricalResistance is not greater than 4 Ω.
3. in order to reduce the skin effect and channel impedance, DC work grounded down lead should pick tele multi-core copper conductors, section should not be less than 35mm2, when you need to improve the signal of working conditions, the use of multiple-unit copper wire.
4. DC work grounding and Exchange work grounding as not using common grounding, the power difference between the two should not exceed 0.5V to avoid interference.
5. input signal cable wear steel pipe laying, or laying in with metal cover of metal cable tray, steel pipe and cable tray should be grounded.
E.-acoustic, TV system grounding
Audio, TV system grounding resistance is 4 Ω, industrial television system such as device capacity ≤ 0.5kVA
, Grounding resistance may not greater than 10 Ω. Mounted in a building at the top of the antenna metal base must be lightning network at the top of the building, consisting of lightning systems, by at least two different direction down lead or main bars in the building for grounding.
To avoid grounding potential difference caused interference AC stray wave, CCTV and industrial TV must be in the grounding.
TV system of the transmission cable wear metal pipe laying, metal pipe to grounded to prevent interference.
F £ ® grounding and grounding installation
1 £ ® adopt joint ELV grounding, grounding resistance must be less than 1 Ω.
2. when adopting the joint ground electrode, weak electricity grounding pin and strong electric grounding pin can not be from the same point out, both to distance above 3m.
3. for a antijamming demanding devices, such as computer, fire control rooms of grounding line application area is not less than 25mm2 insulated copper wire two or discharging of grounding on the insulator, avoid and strong electric grounding line.

4. comprehensive wiring system
A £ ® environment check before construction
In the installation work started the previous response to transfer between devices, architectural and environmental conditions are checked before commencement of the following conditions:
1. transfer of rooms, equipment, work area civil engineering has been completed. Housing surface is smooth, clean, door height and width should be without prejudice to the equipment and equipment for handling, door locks and keys.
2. housing reserved to Groove, dark hole, holes in the location, quantity, size, should meet the design requirements.
3. laying on the floor between the equipment should be specifically check, floor plate laying tight firm per square metre level tolerances should not be greater than 2mm, floor pillars firmly, movable floor anti-static grounding measures should be consistent with the design and product requirements.
4. transfer of rooms, equipment room should be provided to the construction of the power supply and grounding device.
5. transfer of rooms, the area between devices, environmental temperature and humidity should conform to the design requirements and associated regulations.
B £ ® equipment inspection before construction
1. General requirements for equipment inspection
(1) before construction, construction unit dealing with cable equipment specifications, code, quantity, quality check and no factory inspection proof material, or does not comply with the design shall not be used in the project.
(2) upon inspection of the equipment to record, no certificate of deposit should be a separate device, for verification and processing.
2. steel tube and iron casting inspection requirements:
(1) various shapes of material, specifications, models should be consistent with the design documentation, the surfaces must be smooth, smooth, non-deformation, rupture.
(2) pipe used steel pipe, PVC pipe, FRP pipe, the pipe body is smooth with no scars, pipe hole deformation, diameter, wall thickness should be consistent with the design requirements.
(3) pipelines using cement blocks, should be consistent with the Ministry of posts and telecommunications of the communication pipeline engineering specifications for construction and acceptance (YDJ39-90).
(4) various iron material, specifications should conform to quality standards, skew, distort, fly, breakage or damage.
(5) iron surface treatment and coatings should be complete, smooth surface, without peeling, bubble, and other defects.
3. cable inspection requirements:
(1) engineering using twisted pair cabling and optical fiber cable specifications, procedures and forms shall be consistent with the design requirements and contract requirements.
(2) cable attached to the indications, tag content should be complete and clear.
(3) cable sheath to be intact, the cable should be accompanied by a quality inspection certificate. If user requirements, should be accompanied by the bulk cables of electrical performance testing report.
(4) cable from the electrical performance of the bulk cables cut in any three-disc out sampling test 100m length.
(5) to strip the cable head, has A, the B-end requirements to identify the client, the outer ends of the cables should be marked category and ordinal.
(6) optical fiber cable opening should be checked after the appearance with no injury, fiber optic cable end packaging is good.
(7) comprehensive wiring system uses 62.5/125 μ m or μ m 50/125 multi-mode fibre optical cable and graded-single-mode fiber optic cables, field testing should test the fiber attenuation constants and fiber length.
1) attenuation test: the use of optical time domain reflectometer (OTDR) for testing. Test results beyond standard or differences with factory test value is too large, the application of optical power test and comparison, that is testing error or fibre itself attenuation is too large.
2) length test: requirements on each fiber testing, test results should be consistent. If in the same spare cable, fibre length difference is large, you should test it from the other end or make light of checks to determine whether there is a broken fiber phenomenon exists.
(8) fibre scheduling cords (optical jumper) inspection should satisfy the following requirements:
1) fibre cords should have scheduling through fire protection processing of fibre preputial, at both ends of the connector (live) end should be fitted with suitable protective cap;
2) each fiber fibre cords in the scheduling of the type of mark should be obvious, selection should meet the design requirements.
4. plug the inspection requirements of:
(1) connection and information outlets and other connectors and plasticMaterial material should have a flame retardant.
(2) security wiring of security unit over-voltage and over-current protection targets should be consistent with the relevant provisions of the Ministry of posts and telecommunications.
(3) the use of fiber optic socket connector types and quantities, the location and design.
(4) optical socket panel should transmit (TX) and receive (RX) clearly marked.
5. use of wiring devices shall conform to the following:
(1) cable transfer equipment models, specifications should meet the design requirements:
(2) light, cable transfer equipment layout and logo name should match with the design. Various types of signs should unify, mark position is correct, clear.
6. for twisted pair cables, electrical properties, mechanical characteristic and cable transmission performance and add the plug-in specific specification and requirements, should be consistent with the design specifications.
C £ ® device installation
1. rack installation requirements
(1) after installing the rack, horizontal, vertical degrees should conform to the requirements of manufacturers. If no manufacturers, vertical deviation should not be greater than 3mm.
(2) various parts rack may not fall off or chipped. Paint has come to be various flags refinishing, complete and clear.
(3) rack installation should be firm, construction drawing requirements for reinforcement.
(4) install Rack panels, shelves before leaving 1.5m space, the back of the rack should be greater than the distance from the wall for easy installation 0.8m and construction.
(5) wall-mounted machine box bottom margin should be 300 ~ 800mm ground.
2. wiring equipment rack installation requirements:
(1) to adopt the following alignment mode, frame bottom position and cable line hole.
(2) the in-line vertical skew errors should not be greater than the base level error 3mm per square meter should not be greater than 2mm.
(3) terminal block various flags should be complete.
(4) transfer box or dark line box to dark set inside a wall. Reserved hole installation, bottom should be higher than the ground 500 ~ 1000mm.
3. all types of wiring module installation requirements:
(1) module equipment should be complete, the installation is complete, the flag.
(2) install the screws must be tightened, the Panel should be maintained in a horizontal plane.
4. information outlet installation requirements:
(1) installed on the floor or ground shall be fixed in the terminal box, Jack Panel has the form of vertical and horizontal; junction box cover can be opened and should be tight and waterproof, dustproof. Junction box cover should be flush with the ground.
(2) installation on the wall, above the ground, such as ground using 300mm movable floor, should be assumed to do within the raised floor inch.
(3) information outlet base, fixed to the construction site conditions, the use of expansion screws, air, etc.
(4) screws to tighten the loose phenomenon should not be generated.
(5) information outlet should have the labels, colors, graphics, text indicates that the terminal equipment type.
(6) the installation location should meet the design requirements.

5 £ ® cable tray and channel installation requirements:
(1) bridge and channel installation location should be consistent with the provisions about construction plans, should not exceed 50mm deviation.
(2) cable tray and grooved horizontal degrees per square deviation should not exceed 2mm.
(3) vertical tray and channel should be perpendicular to the ground and not tilt, vertical deviation should not exceed 3mm.
(4) two channel stitching Department level deviation should not exceed 2mm.
(5) vertical installation should keep the hanger, neat firmly, without tilt phenomenon.
(6) metal cable tray and grooved and internode should contact good, installed securely.
6. installation frame, wiring devices and metal pipe, duct grounding should meet the design requirements and maintain a good electrical connection.
D £ ® cable laying and support protection mode
1. cable laying
(1) cable laying General should meet the following requirements:
1) cable layout before check specifications, routines, routing and location and design requirements.
2) cable layout should be straight, not producing twisted, loop, etc., should not be subject to external forces of extrusion and injury.
3) cable ends before the cloth should be labeled to indicate the start and end position, the labels should be clear, is written and correct.
4) power cable, signal cable, twisted pair cable, optical fiber cables and building other weak electricity system cable layout should be separated. The cable between the minimum net margin should meet the design requirements.
5) cable layout should be redundant. The rooms, twisted pair cable between devices reserved length usually 3 ~ 6m, workspace 0.3 ~ 0.6m; fiber-optic cable in the device-side length generally reserved for 5 ~ 10m. There are special requirements should be set aside by the design requirements.
6) cable bend radius should satisfy the following requirements:
① unshielded twisted pair cable 4 on the bend radius should be at least 4 times the cable diameter, in the construction process should be at least 8 times.
② shielded twisted pair cable bend radius should be at least as cable diameter 6 ~ 10 times.
③ twisted pair cable backbone of bend radius should be at least 10 times the cable diameter.
④ cable bend radius of at least least optical cable outer diameter of 15 times, in the construction process should be at least 20 times.
⑤ cable laying, traction, hanging the fulcrum of the cables should not be greater than the spacing between 1.5m, cloth cable traction force, should be less than cables allow tension of 80%, for the moment the maximum traction cable should not exceed the permitted tension cables. Laid in traction, main traction cables should be in the cable core strengthening.
⑥ cable layout process in order to avoid stress and distortion, should produce qualified end of traction. Such as mechanical traction, according to the length of the cable traction, cloth on the environment, on factors such as the traction tension selection concentrated traction or distributed traction.
⑦ cloth fibre-optic cable, optical cable reels spin cloth with fiber-optic cable, optical cable traction speed generally 15m/min. Optical out spare OfficeTo protect armed relaxation of radians, and have a buffer of allowance, and should not be too much to avoid cable back button appears.
(2) embedded trunking and dark pipe laying cable should meet the following requirements:
1) laying pipe ends should be marked, indicating that the room number, serial number, and length.
2)
Laying of underground pipes up to date with steel or PVC pipe fire retardant hard. Chief master put double sheathed cord and trunk cable, straight pipe diameter utilization should be 50-60%, the elbow pipe of 40 ~ 50%, dark tube placed 4 on twisted pair cable, pipeline section utilization should be 25 ~ 30%.
Use of embedded trunking, trunking trunkings profile usage should not exceed 40%.
3) optical fiber cable and cable and pipe laying, dark tubes ready-made plastic tubing, plug the cable laying in a tube, separate from the cable and cable laying, pipe inner diameter of the child should be the optical cable outer diameter 1.5 times.
(3) set the cable tray and trunking for laying cable should meet the following requirements:
1) cable tray should be high up above the surface, the cable tray top 2.2m from ceiling or other obstructions shall be not less than 0.3m. Tray width not less than 0.1m, bridge the fill rate in the cross section should not exceed 50%.
2) cable tray inner cable laying vertically, in the upper end of the cable and 1.5m per interval should be fixed in the tray at the brackets; horizontal installation, in the first, of the cable to turn tail, and each interval 3 ~ 5m for reinforcement.
3) cable trunking to higher ground 2.2m. in setting the ceiling, the slot cover open surface should maintain 80mm overbridges, trunking cross-section utilization should not exceed 50%.
4) cloth trunking cable can not binding, Groove cable should be straight, try not to turn *, cable trunking should not be spilled on, in and out of the cable trunking, corner should be lashing. Vertical wire cloth cable should be fixed for each interval 1.5m bracket in the cable.
5) in the horizontal, vertical tray and vertical flutes in the laying of cables should be binding cables. 4 on twisted pair cable to root for the bundle, 24 and 25 on or above the trunk twisted pair cables, optical cables and other signal cable should be based on the type of cable, rope diameter, the cable core number splitting binding. Fastening spacing should not be greater than the spacing 1.5m, buckle should be uniform, moderate elasticity.
6) complex subsystems using aerial ducts and in ground, walls and dark pipe laying construction electrical cables should refer to the technical requirements of PTT the local telephone line engineering specifications for construction and acceptance, the telecommunication network for optical digital transmission systems engineering construction and acceptance of the interim technical regulations related regulations.
2. supporting protection mode
(1) wiring subsystem cable laying support protection should meet the following requirements:
1) embedded trunkings support protection mode;
① in building embedded trunking can be of different sizes, according to a layer or layer settings should be at least two embedded above, trunking height should not exceed 25mm section.
② trunking buried should less than 6 m in length or online slot routing to *, turn the times set la box, so that the cloth cabling and maintenance.
2) pre-buried pipes protection requirements:
① Dark tube use metal pipe or flame retardant rigid PVC pipe, embedded in the wall is of dark tube inner diameter should not be more than 50mm, floors of dark pipe inner should 15 ~ 25mm. Straight tubing 30m should set the dark line boxes, and other devices.
② the turning angle of dark tube should be greater than 90o, on the path of each dark tubes shall be not more than two turns, and should not have the S bend. Pipe bending cloth, each interval 15m Department should set the dark line boxes, and other devices.
③ Dark pipe bend radius of curvature of not less than 6 times the outer diameter, such as dark outer diameter greater than 50mm, should not be less than 10 times.
3) set the cable trays and cable trunking supports protection requirements:
① tray level laying, support spacing General 1.5 ~ 3m, vertical installation in buildings on spacing should gouti is less than 2m.
② trunkings laying, you set the bracket or cradles:
A £ ® wiring duct joints;
B £ ® spacing 3m;
C £ ® leave trunking 0.5m two ports;
D £ ® corner.
③. plastic trunking base fixed spacing generally 1m.
4) laying floor laying cables, activities within the floor should not be less than clear, movable floor 150mm if as a ventilation system of ducts, the floor should not be less than the height measured 300mm.
5) in the workspace information point and cable laying pending cases, or in the workspace using the carpet under the cloth cable is working sets the transfer box quyi, each transfer box service about 80m2.
6) different types of cables are placed within the trunkings, cloth with Groove lab. Trunkings earthing should meet the design requirements.
7) trunk cable laying supporting subsystem protection should meet the following requirements:
1) cable shall not be placed in the elevator, or pipe shaft.
2) route between channels should be communication.
Shaft in the cable through the hole on each floor is appropriate in a rectangle or circle. Rectangular holes size should not be small and round openings 300mm×100mm, should at least install three round steel, tube diameter should not be less than 100mm.
E-cable terminal
1. cable terminal General requirements:
(1) cable in Terminal, you must check the label colors and numbers mean, and sequential Terminal.
(2) cable connector to the Middle may not arise.
(3) cable terminal Department must meet strong contact card is good.
(4) cable terminal should comply with the design and installation manuals for manufacturers.
(5) twisted pair cables and plug-in connections should identify line number, line color, shall not be reversed and the wrong answer.
2. twisted pair cable terminal should meet the following requirements:
(1) twisted pair cable terminal should amount to maintain the status, non-twist twisted length for cat 5 cable should not be greater than 13mm, 4 types of wire is not greater than 25mm.BR > (2) peeling sheath insulation shall be scratches, you should use a special tool to strip.
(3) on the strand in and information outlets (RJ45) are connected, you must press the color stop and line to order card. Socket type, colour and number should be consistent with the provisions in the following figure:
(4) twisted pair cable with RJ45 information outlet clamp connection after the first near-far, after the first order card.
(5) twisted pair cabling and wiring module (IDC, RJ45) card receipt should be provided for the design and manufacturer.
(6) shielded twisted pair cable shielding and shield plug Department may * contact cable shield should be patch shielding enclosures 360o circumference length of contact, the contact should not be less than 10mm.
3 cable core wire terminal should meet the following requirements:
(1) use of fiber optic cable connection box on the wire's successor, protection, fibre connection box for fixed and drawer second way. In the Connect box fibre should be able to get enough of the bending radius.
(2) the thawing receive or mechanical optical fiber splicing should be protected and secure, using connectors for fibre of jump.
(3) the connection box Panel should have the labels.
(4) the jumper soft fiber activities connector before you insert the adapter should be clean, the insert location meets the design requirements.
4. various jumper's Terminal
(1) various jumps cable and connector should good contact between the wiring is correct, and complete flag. Jumper selection types should comply with system design requirements.
(2) the jumper length should meet design requirements, twisted pair cable in General should not be less than 5 m, optical fiber cable should not be less than 10 m.
Engineering acceptance F.
1. completion of the technical file shall be the following requirements:
(1) after the project completion, construction unit should be in the works acceptance before completion of technical information in triplicate to construction unit.
(2) completion of the comprehensive wiring system engineering technology information should include the following:
¡Ø installation works;
▲ Project instructions;
▲The equipment, equipment breakdown;
¡Ø completion construction drawings for the construction of the design;
¡Ø test records;
¡Ø system using microcomputer design, management, maintenance, monitoring, should the provider manifest and user data files, such as disk, instructions and other documents;
¡Ø engineering change, inspection records and construction process, the need to change the design or to take the relevant measures, by construction, design, construction, and other units of the two sides negotiated between records;
¡Ø with worker acceptance record;
¡Ø concealed work visa.
(3) the completion of the technical file to guarantee quality, so tidy, content is complete, accurate data.
(4) comprehensive wiring system, the items listed below, the contents of the test:
1. project of the electrical performance test connection diagram; length; proximal crosstalk attenuation;; special rules in the design of content inspection with workers
2. type of optical sheets property test (single-mode or multimode); decay; the completion of the examination of reflection
3. system grounding meet design requirements completion inspection
1. completion of the technical file inventory transfer technology file completion inspection
2. project assessment review the quality of the project, the completion of the test results confirm the acceptance of