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GB/T 50312-2016 English PDF (GBT50312-2016)

GB/T 50312-2016 English PDF (GBT50312-2016)

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GB/T 50312-2016: Code for engineering acceptance of generic cabling system

This Code is formulated, to unify the technical requirements for construction quality inspection, on-site inspection, completion acceptance of generic cabling system projects for buildings and building complexes. This Code is applicable to the acceptance of generic cabling system projects for newly built, expanded, renovated buildings and building complexes.
GB/T 50312-2016
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
UDC
P GB/T 50312-2016
Code for engineering acceptance of generic cabling system
ISSUED ON: AUGUST 26, 2016
IMPLEMENTED ON: APRIL 01, 2017
Issued by: Ministry of Housing and Urban-Rural Development of PRC.
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Table of Contents
Foreword ... 5
1 General provisions ... 7
2 Abbreviation ... 7
3 Environment examination ... 8
4 Examination of equipment and test instrumentation ... 10
5 Examination of equipment installation ... 13
6 Examination of cable laying and protective measures ... 15
6.1 Cable laying ... 15
6.2 Protective measures ... 19
7 Cable termination ... 22
8 Engineering electrical testing ... 25
9 Management system acceptance ... 28
10 Engineering acceptance ... 30
Appendix A Engineering inspection contents ... 33
Appendix B Engineering electrical testing methods and contents ... 37
Appendix C Fiber channel and link testing ... 57
Explanation of wording in this code ... 60
List of quoted standards ... 61
Code for engineering acceptance of generic cabling system
1 General provisions
1.0.1 This Code is formulated, to unify the technical requirements for construction quality inspection, on-site inspection, completion acceptance of generic cabling system projects for buildings and building complexes.
1.0.2 This Code is applicable to the acceptance of generic cabling system projects for newly built, expanded, renovated buildings and building complexes.
1.0.3 During the construction process, the construction organization shall comply with the requirements on construction quality inspection. The building organization shall strengthen on-site quality inspection, through construction site representatives or project supervisors; organize the inspection, signoff, certification work of concealed work in a timely manner.
1.0.4 Self-test and completion acceptance test shall be carried out, before acceptance of the generic cabling project.
1.0.5 In addition to complying with this Code, the acceptance of generic cabling system projects shall also comply with the provisions of relevant national standards. 2 Abbreviation
ACR-F: Attenuation to Crosstalk Ratio at the Far-end
ACR-N: Attenuation to Crosstalk Ratio at the Near-end
d.c.: Direct Current Loop Resistance
ELTCTL: Equal Level TCTL
FEXT: Far End Crosstalk Attenuation (loss)
IL: Insertion Loss
NEXT: Near End Crosstalk Attenuation (loss)
OLT: Optical Line Termina1
OLTS: Optical Loss Test Set
OTDR: Optical Time Domain Reflectometer
PS NEXT: Power Sum Near End Crosstalk Attenuation (loss)
PS AACR-F: Power Sum Attenuation to Alien Crosstalk Ratio at the Far-end PS AACR-Favg: Average Power Sum Attenuation to Alien Crosstalk Ratio at the Far-end
PS ACR-F: Power Sum Attenuation to Crosstalk Ratio at the Far-end
PS ACR-N: Power Sum Attenuation to Crosstalk Ratio at the Near-end
PS ANEXT: Power Sum Alien Near-End Crosstalk (loss)
PS ANEXTavg: Average Power Sum Alien Near-End Crosstalk (loss)
PS FEXT: Power Sum Far End Crosstalk
RL: Return Loss
TCL: Transverse Conversion Loss
TCTL: Transverse Conversion Transfer Loss
3 Environment examination
3.0.1 The building environment examination of work areas, telecommunications rooms, equipment rooms, etc. shall comply with the following requirements:
1 The civil works in the work area, telecommunications room, equipment room, user unit area shall be completed. The floor of the building shall be flat and smooth; the height and width of the door shall comply with the requirements of design document.
2 The location, quantity, size of embedded trough boxes, concealed conduits, holes, shafts in the building shall comply with the requirements of design document. 3 Where the raised floor is laid, the anti-static measures and earthing of the raised floor shall comply with the requirements of design document.
4 The height -- from the bottom of the information socket box, which is concealed or exposed on the wall or column to the ground -- should be 300 mm.
5 The height -- from the bottom of the information socket box, which is installed on the side partition of the workbench to the adjacent wall -- should be 1000 mm. 6 The CP assembly point box and multi-user information socket box should be installed on the inlet side of the duct, as well as on columns and load-bearing walls, which are easy for maintenance. The height of the bottom edge of the box, above the ground, should be 500 mm. When installed on the upper part of the wall or column OR when installed in a suspended ceiling, the height from the ground should not be less than 1800 mm.
7 Each work area should be equipped with no less than 2 single-phase AC 220 V/10 A power socket boxes, which have protective earthing. The power socket should be inlaid and concealed in the wall; the height shall be consistent with the information socket.
8 It should reserve two single-phase AC 220 V/10 A power sockets, at a level of 70 mm ~ 150 mm near the information distribution box of each user unit. The distribution lines of each power socket shall be equipped with protective electrical appliances. The single-phase AC 220 V power supply shall be introduced into the wiring box. The power socket should be inlaid and concealed in the wall; the height from the bottom to the ground should be consistent with the information wiring box.
9 No less than 2 single-phase AC 220 V/10 A power socket boxes shall be installed in the telecommunications room, equipment room, incoming line room. The distribution line of each power socket shall be equipped with a protector. The power supply of the equipment shall be configured separately. The power socket should be inlaid and concealed in the wall; the height from the bottom to the ground should be 300 mm.
10 Reliable grounding equipotential bonding terminal boards shall be provided, in telecommunications rooms, equipment rooms, incoming line rooms, weak current shafts. The grounding resistance value and grounding wire specifications shall meet the design requirements.
11 Factors such as the location, area, height, ventilation, fire protection, environmental temperature, humidity of telecommunications rooms, equipment rooms, incoming line rooms shall meet the design requirements.
3.0.2 The inspection of the building?€?s incoming line room and entrance facilities shall meet the following requirements:
1 The number, combination and arrangement of incoming pipes, as well as the location and spacing between other facilities, such as electrical, water, gas, sewers, etc., shall comply with the requirements of the design documents;
2 The laying method used for incoming cables shall comply with the requirements of the design documents;
3 The treatment of the pipeline inlet shall meet the design requirements; measures 5 Metal pipe troughs shall be galvanized or otherwise anti-corrosion treated, according to the requirements of the engineering environment. Plastic pipe troughs shall be flame-retardant pipe troughs; the outer walls shall have flame-retardant markings;
6 The materials and specifications of various metal parts shall meet the quality requirements; there shall be no skew, twist, burr, break or damage;
7 The surface treatment and plating of metal parts shall be uniform and complete; the surface shall be smooth, without defects such as falling off or blisters. 4.0.3 The inspection of cables shall comply with the following requirements: 1 The types and specifications of cables and optical cables used in the project as well as the flame retardant grade of the cables shall comply with the requirements of the design documents.
2 The cable's exit-factory quality inspection report, certificate, exit-factory test record and other accompanying materials shall be complete. The attached signs and labels shall be complete and clear; the outer packaging shall indicate the model and specifications.
3 The outer packaging and outer sheath of the cable must be intact. When the outer packaging of the panel or box is seriously damaged, it shall be inspected according to the cable product requirements; used in the project after passing the test. 4 The cables shall be accompanied by an electrical performance inspection report for this batch. Before construction, the cable lengths and index parameters of the panels and boxes shall be randomly inspected, according to cable product standards. The provided equipment cables and jumpers shall also be randomly inspected; the test records shall be made.
5 After opening the optical cable, it shall first check whether the end seal of optical cable is in good condition. When the optical cable?€?s outer packaging or optical cable sheath is damaged, the optical fiber cable shall be tested for optical fiber performance indexes, which shall comply with the following requirements: 1) When there is fiber breakage, it shall be processed and used after passing the inspection;
2) The markings on ends A and B of the optical cable shall be correct and obvious; 3) After the fiber testing is completed, the end shall be sealed and fixed; the outer packaging shall be restored.
6 Single-coil of optical cables shall be tested for length of each optical fiber. 7 The inspection of optical fiber splicing cords or optical jumpers shall comply with the following requirements:
1) The end faces of the optical fiber connecting devices at both ends shall be equipped with appropriate protective caps;
2) Optical fibers shall have obvious type markings; they shall comply with the requirements of design document;
3) Use an optical fiber end-face tester to randomly inspect the end faces of the batch of optical connection devices; the proportion should not be greater than 5% ~ 10%.
4.0.4 The inspection of connecting devices shall comply with the following requirements:
1 The components of wiring modules, information socket modules and other connecting devices shall be complete; the electrical and mechanical performance and other indicators shall comply with the quality standards of the corresponding products. Plastic materials shall be flame retardant AND meet design requirements. 2 The type, quantity, port location of optical fiber connecting devices and adapters shall be consistent with the design. Optical fiber connecting devices shall have a smooth and clean appearance, without defects such as oil stains, burrs, scars, cracks; the combination of various components shall be tight and smooth.
4.0.5 The use of cabling equipment shall comply with the following requirements: 1 The types and specifications of optical and cabling equipment shall comply with the requirements of the design documents;
2 The arrangement and label names of optical and cabling equipment shall be consistent with the design. The names of various signs shall be unified; the position of the signs shall be correct and clear.
4.0.6 The inspection of test instruments and tools shall comply with the following requirements:
1 Instruments and tools that need to be used in the project shall be tested or inspected in advance. Cable testing instruments shall be accompanied by certification documents from the testing agency.
2 The test instrument shall be able to test various electrical performance and transmission characteristics of the corresponding cabling level; its accuracy shall meet the corresponding requirements. The accuracy of the test instrument shall be regularly inspected and calibrated, according to the corresponding identification procedures and calibration methods. It can only be used within the validity period, 4 The opening and closing of the door lock shall be flexible and reliable; 5 Cabinets, wiring boxes, bridges and other equipment shall be installed firmly. When there are seismic requirements, they shall be reinforced according to seismic design.
5.0.2 The installation of various wiring components shall comply with the following requirements:
1 All components shall be complete, installed in place; the marking shall be complete and clear;
2 The mounting screws shall be tightened; the panel shall remain on a flat surface. 5.0.3 The installation of information socket modules shall comply with the following requirements:
1 The installation position and height of the information socket bottom box, multi- user information socket, assembly point wiring box, user unit information wiring box shall comply with the requirements of design document.
2 When installed in the raised floor or on the ground, it shall be fixed in the junction box. The socket panel shall be upright or horizontal. The junction box cover can be opened and shall be waterproof, dustproof, pressure-resistant. The junction box cover shall be flush with the ground.
3 When the information socket module and power socket are installed in the bottom box of the information socket at the same time, the spacing and protective measures taken shall comply with the requirements of design document.
4 The fixing method of the surface-mounted information socket bottom box shall be determined, according to the construction site conditions.
5 The fixing screws shall be tightened; they shall not be loose.
6 Various socket panels shall be marked with colors, graphics, text, to indicate the service type of the connected terminal equipment.
7 The optical fiber connecting devices and adapter installation bottom boxes for terminating optical cables in the work area shall have space. They shall meet the requirements of the design documents.
5.0.4 The installation of cable trays shall comply with the following requirements: 1 The installation position shall comply with the requirements of the construction drawing; the left and right deviation shall not exceed 50 mm;
2 The installation level deviation shall not exceed 2 mm per meter;
3 Vertical installation shall be kept perpendicular to the ground; the perpendicularity deviation shall not exceed 3 mm;
4 The cutting and splicing parts of the cable tray shall be smooth without burrs; 5 The installation of hangers and brackets shall be kept vertical, neat and firm, without any skew;
6 The metal cable trays and metal conduit sections shall be well connected and installed firmly;
7 When using vertical trough boxes to lay cables, the support points should avoid the ground trenches and trough boxes; the support shall be firm.
5.0.5 The earthing electrode, which is used when installing cabinets, wiring boxes, wiring equipment shields, metal conduits, cable trays, shall comply with the requirements of the design documents and be earthed nearby; it shall maintain good electrical connections.
6 Examination of cable laying and protective measures
6.1 Cable laying
6.1.1 The laying of cables shall comply with the following requirements: 1 The type and specifications of cables shall be consistent with the design requirements.
2 The laying method and layout spacing of cables in various environments shall comply with the design requirements.
3 The cables shall be laid out naturally and straight, without twisting or looping; they shall not be squeezed or damaged by external forces.
4 Cable joints must not appear in the routing of cables.
5 Both ends of the cable shall be labeled and numbered; the label writing shall be clear, straight, correct. Labels shall be made of materials, that are not easily damaged.
6 Cables shall have margin, to accommodate termination, final connection, testing, changes. If there are special requirements, the length shall be reserved according to the design requirements, which shall comply with the following requirements: 1) At the termination point of the twisted pair cable, the reserved length in the bottom box of the information socket should be 30 mm ~ 60 mm in the work 2 The embedded trough box should be a metal trough box; the cross-section utilization rate shall be 30% ~ 50%.
3 Concealed conduits should be made of steel pipes or flame-retardant polyvinyl chloride pipes. When laying amplified pair of trunk cables and optical cables with more than 4 cores, the diameter utilization rate of straight ducts shall be 50% ~ 60%; the diameter utilization rate of curved ducts shall be 40% ~ 50%. When laying 4 pairs of twisted cables or optical cables with 4 cores or less, the cross-sectional utilization rate of the pipeline shall be 25% ~ 30%.
4 In places where metal materials are severely corroded, metal conduits and bridge wiring should not be used.
5 Metal conduits and trough boxes shall be used for wiring in the suspended ceiling of the building.
6 Where conduits and bridges span the deformation joints of buildings,
compensation devices shall be installed.
6.1.3 Setting up cable trays and laying cables shall comply with the following requirements:
1 The cables in the sealed trough box shall be laid out in a straight line and should not cross. The cables shall be tied and fixed, where they enter and exit the trough box and where they turn.
2 When laying cables vertically in a ladder frame or tray, the cable shall be fixed on the bracket of the ladder frame or tray, at the upper end of the cable and at interval of 1.5 m. When laying cables horizontally, the cable shall be fixed, at the beginning, end, turn or an interval of 5 m ~ 10 m the cable.
3 When laying cables in horizontal or vertical ladder frames or tray, the cables shall be tied. Twisted cables, optical cables and other signal cables shall be bundled, according to the category, quantity, cable diameter, number of cable cores. The binding spacing should not be greater than 1.5 m; the spacing shall be even; the binding should not be too tight or cause the cables to be squeezed.
4 When indoor optical cables are laid open in a ladder frame or tray, a cushion cover shall be added on the binding fixed section.
6.1.4 When using ceiling support columns (vertical trough boxes) to lay cables in the ceiling, the cables within the range of each support column may be laid without a sealed trough box; however, they shall be bundled; the cables shall be flame retardant; the cable selection shall comply with the requirements of design document.
6.1.5 For the construction quality inspection and acceptance of cable laying in the building group subsystem, using methods such as overhead, pipelines, cable trenches, cable tunnels, direct burial, walls, concealed conduits, it shall comply with the relevant provisions of the current industry standard "Acceptance specifications for telecommunication cable line engineering" YD 5121.
6.2 Protective measures
6.2.1 The cable laying protection of the wiring subsystem shall comply with the following requirements:
1 When metal conduits and troughs are laid openly, it shall meet the following requirements:
1) When the trough box is laid in an exposed manner, the distance between it and the beams or side walls or other obstacles should not be less than 100 mm; 2) The connection part of the trough box shall not be set at the hole, that passes through the floor slab and the solid wall;
3) The fixed distance -- between vertical conduits and cable trough boxes on the wall -- should not be greater than 1500 mm;
4) Pipe clamps shall be used at 300 mm away from the junction box, on both sides of the elbow, at an interval of 3 m.
2 The protection of embedded metal trough boxes shall comply with the following requirements:
1) Pre-embedded trough ...

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