GB 50168-1992 Specification for construction and acceptance of cable lines for electrical installation projects
Some standard content:
Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
50168—92
Electrical Equipment Installation Engineering
Code for construction and acceptance of cable levels electric equipment installation engineering standard
1992—12—16
1993—07—01
1 implementation
State Administration of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering construction standard full-text information system
Jointly issued
Engineering construction standard full-text information system
National standard of the People's Republic of China
Electrical installation engineering
Cable line construction and acceptance specification
5016892
Editor department: Ministry of Energy of the People's Republic of ChinaApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: July 1, 1993
Engineering construction standard full-text information system
Engineering construction standard full-text information system
About the release of national standards
《Electrical installation engineering
Construction and acceptance specification of rotating electrical machines》
Notice on the approval of five national standards
Construction Standard [1992] No. 911
According to the requirements of the State Planning Commission's Letter of Planning (1987) No. 78 and the Ministry of Construction's (88) Construction Standard No. 25, the five standards "Construction and Acceptance Specifications for Rotating Electric Machines in Electrical Installation Projects" jointly formulated by the Ministry of Energy and relevant departments have been reviewed by relevant departments and are now approved. "Construction and Acceptance Specifications for Rotating Electric Machines in Electrical Installation Projects" GB50170
-92, "Construction Standard "Specification for Construction and Acceptance of Panels, Cabinets and Secondary Circuit Connections for Gas Installation Engineering" GB50171-92, "Specification for Construction and Acceptance of Storage Batteries for Electrical Installation Engineering" GB50172-92, "Specification for Construction and Acceptance of Cable Lines for Electrical Installation Engineering" GB50168-92 and "Specification for Construction and Acceptance of Grounding Devices for Electrical Installation Engineering" GB50169-92 are mandatory national standards and will be implemented from July 1993. The third chapter of the "Construction and Acceptance Specifications for Electrical Installation Engineering" - Rotating Motors, the fourth chapter - Panels, Cabinets and Secondary Circuit Connections, the fifth chapter - Storage Batteries, the eleventh chapter - Cable Lines and the fifteenth chapter - Grounding Devices are abolished at the same time. This standard is managed by the Ministry of Energy, and the Ministry of Energy's Electric Power Construction Research Institute is responsible for specific interpretations, and the Ministry of Construction's Standards and Norms Research Institute is responsible for publishing and issuing. Ministry of Construction of the People's Republic of China
December 16, 1992
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Revision Notes
This specification is edited by the former Ministry of Water Resources and Electric Power in accordance with the requirements of the State Planning Commission's Bidding Letter (1987) No. 78 and the Ministry of Construction's (88) Jianbiaozi No. 25, and is specifically compiled by the Ministry of Energy's Electric Power Construction Research Institute in conjunction with relevant units. During the revision process, the specification revision group conducted extensive investigations and studies, carefully summarized the experience since the implementation of the original specification, absorbed some scientific research results, widely solicited opinions from relevant units across the country, and finally reviewed and finalized the draft together with relevant departments. This specification is divided into eight chapters and three appendices. The main contents of this revision are: the scope of application of the specification has been expanded; the requirements for cable tray construction and the construction requirements for cable fire prevention measures have been added, and some contents of underwater cable laying, some contents of mechanical cable laying, and the production requirements of plastic cable terminals and joints have been supplemented. If you find any need for modification or supplementation during the implementation of this specification, please send your opinions and relevant information to the Electric Power Construction Research Institute of the Ministry of Energy (Beijing Liangxiang, Postal Code: 102401), the management unit of this specification, for reference in future revisions. Ministry of Energy
December 1990
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Section 1
Section 2
Section 3
Section 4
Section 5||tt ||Section 6
Chapter 6
Section 1
Section 2
Chapter 7
Chapter 8
Appendix 2
Appendix 3
Transportation and Storage·
Processing and Laying of Cable Tubes
Preparation and Installation of Cable Brackets.·
Laying of Cables
General Provisions
Inside Production Plants and Tunnels, Laying of cables in trenches Laying of cables in ducts
Laying of straight cables
Laying of underwater cables·
Laying of cables on bridges
Manufacture of cable terminals and joints
General provisions and preparatory work
Manufacture requirements
Fire prevention and flame retardancy of cables
Project handover and acceptance
Explanation of terms in this specification
Common calculation formulas for lateral pressure and traction Explanation of terms used in this specification
Additional explanation
Engineering Construction Standards Full Text Information System
: (30)
Engineering Construction Standards Full Text Information System
Chapter 1 General Provisions
Article 1.0.1 This specification is formulated to ensure the construction quality of cable line installation projects, promote the improvement of cable line construction technology level, and ensure the safe operation of cable lines.
Article 1.0.2 This specification applies to the construction and acceptance of the installation of power cables and control cable lines of 500kV and below. The installation of cable lines with special requirements in mining, shipbuilding, metallurgy, chemical industry, etc. shall also comply with the relevant provisions of professional regulations. Article 1.0.3 The installation of cable lines shall be carried out according to the approved design. Article 1.0.4 The transportation and storage of cables and their accessories shall comply with the requirements of this specification. When there are special requirements for the product, it shall also meet the requirements of the product. Article 1.0.5 The storage period of cables and their accessories before installation shall be one year or less. When long-term storage is required, it shall comply with the special provisions for equipment storage. Article 1.0.6 The cables and accessories used shall comply with the provisions of the current national technical standards and shall have qualification certificates. The equipment shall have a nameplate. Article 1.0.7 The safety and technical measures during construction shall comply with the provisions of this specification and the current relevant safety and technical standards and technical documents of the product. For important construction projects or processes, safety and technical measures should be formulated in advance. Article 1.0.8 The construction of building projects related to the installation of cable lines shall meet the following requirements:
, the construction quality of buildings and structures related to the installation of cable lines shall comply with the relevant provisions of the current national construction and acceptance specifications. 2. Before the installation of cable lines, the construction project shall meet the following conditions: 1. The pre-processed parts meet the design and are firmly placed; 2. The floor and plastering work of cable trenches, tunnels, shafts and manholes are completed. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3. The temporary construction facilities, templates and construction waste materials in the cable layer, cable trench, tunnel, etc. are cleaned up, the construction roads are unobstructed, and the covers are complete; 4. After the cable line is laid, the construction work that can no longer be carried out should be completed; 5. The drainage of the cable trench is unobstructed, and the doors and windows of the cable room are installed. 3. After the cable line is installed and put into operation, the construction project should complete the construction project decoration work caused by the need to supplement the embedded parts, open holes, expand holes, etc. Article 1.0.9 Except for the steel fasteners and anchor bolts used for the installation of cables and their accessories, hot-dip galvanized products shall be used.
Article 1.0.10
For cable lines with anti-interference requirements, anti-interference measures shall be taken according to the design requirements.
Article 1.0.11
In addition to the implementation of the provisions of this specification, the construction and acceptance of cable lines shall also comply with the provisions of the relevant national standards and specifications in force. Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 2 Transportation and Storage
Article 2.0.1 During transportation and loading and unloading, cables and cable drums shall not be damaged. It is strictly forbidden to push the cable drum directly off the vehicle. Cable drums should not be transported or stored flat.
Article 2.0.Article 2 Before transporting or rolling the cable drum, the cable drum must be firm and the cable must be tightly wound. The oil pipe between the oil-filled cable and the pressure oil tank should be fixed and not damaged. The pressure oil tank should be firm and the pressure indication should meet the requirements. When rolling, you must follow the arrow on the cable drum or the direction of the cable winding. Article 2.0.3 After the cable and its accessories arrive at the site, they should be inspected in time according to the following requirements:
1. The technical documents of the product should be complete.
2. The cable model, specification, and length should meet the order requirements, the accessories should be complete, and the cable appearance should not be damaged.
3. The cable end should be tightly sealed. When there is doubt in the appearance inspection, moisture judgment or test should be carried out.
4. The pressure oil tank, oil pipe, valve and pressure gauge of the oil-filled cable should meet the requirements and be intact.
Article 2.0.4 If the cables and related materials are not installed immediately, they shall be stored in accordance with the following requirements: bzxZ.net
1. Cables shall be stored in a centralized and classified manner, and shall be marked with the model, voltage, specification and length. There shall be passages between cable reels. The foundation shall be solid. When conditions are limited, pads shall be added under the reels, and water shall not accumulate in the storage area.
2. When storing the porcelain sleeves of cable terminals, measures shall be taken to prevent mechanical damage. 3. The moisture-proof packaging of the insulating materials of cable accessories shall be well sealed and shall be stored and kept in accordance with the material properties and storage requirements. Engineering Construction Standard Full Text Information System
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Engineering Construction Standard Full Text Information System
4. Fire-proof materials such as fire-proof coatings, wrapping tapes, and plugging materials shall be stored and kept in accordance with the material properties and storage requirements.
5. Cable trays shall be stored in categories and shall not be deformed due to stress. Article 2.0.5 During the storage period, the cable drum and packaging should be intact, the markings should be complete, and the end should be tightly sealed. When there are defects, they should be handled in time. The oil pressure of oil-filled cables should be checked frequently and recorded, and the oil pressure should not drop to the minimum value. When the oil pressure drops to zero or a vacuum occurs, it should be handled in time. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 3 Processing and Laying of Cable Tubes
Article 3.0.1 Cable tubes should not have perforations, cracks, and significant unevenness, and the inner wall should be smooth; metal cable tubes should not have serious rust. Hard plastic tubes shall not be used in places where the temperature is too high or too low. In places susceptible to mechanical damage and in places with greater force, pipes of sufficient strength should be used. Article 3.0.2 The processing of cable tubes shall meet the following requirements: 1. The pipe mouth should be free of burrs and sharp edges, and the pipe mouth should be made into a trumpet shape. 2. After bending, the cable tube should not have cracks and significant dents, and the degree of bending should not be greater than 10% of the outer diameter of the tube; the bending radius of the cable tube should not be less than the minimum allowable bending radius of the inserted cable. 3. Metal cable tubes should be coated with anti-corrosion paint or asphalt on the surface, and the galvanized tubes should also be coated with anti-corrosion paint at the peeling zinc layer.
Article 3.0.3 The ratio of the inner diameter of the cable tube to the outer diameter of the cable shall not be less than 1.5; in addition to meeting the above requirements, the inner diameter of concrete pipes, clay pipes, and asbestos cement pipes should not be less than 100mm.
Article 3.0.4 Each cable tube should not have more than 3 elbows and no more than 2 right-angle bends.
Article 3.0.5 When laying cable tubes in the open, they should meet the following requirements: 1. The cable tube should be installed firmly; the distance between the support points of the cable tube should not exceed 3m when there is no design requirement.
2. When the straight length of the plastic pipe exceeds 30m, an expansion joint should be installed. Article 3.0.6 The connection of the cable pipe should meet the following requirements: 1. The connection of the metal cable pipe should be firm, the seal should be good, and the two pipe openings should be aligned. The length of the short sleeve or threaded pipe joint should not be less than 2.2 times the outer diameter of the cable pipe, and the metal cable pipe should not be directly welded. Engineering Construction Standard Full Text Information System
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Engineering Construction Standard Full Text Information System
2. When the hard plastic pipe is sleeved or plugged, the insertion depth should be 1.1~1.8 times the inner diameter of the pipe. Adhesive should be applied to the plug-in surface to seal it firmly; when sleeved, the two ends of the sleeve should be sealed and welded.
Article 3.0.7 The position of the cable pipe opening leading to the equipment should be convenient for connection with the equipment and should not hinder the disassembly and installation of the equipment and entry and exit. The pipe openings of the cable pipes laid in parallel should be arranged neatly. Article 3.0.8 When using the protective steel pipe of the cable as the grounding wire, the grounding wire should be welded first; at the threaded pipe joints, jumper welding should be used before laying the cable. Article 3.0.9 When laying cable pipes made of concrete, clay, asbestos cement, etc., the foundation should be solid and flat, and there should be no subsidence. The laying of cable pipes should meet the following requirements:
1. The buried depth of the cable pipe should not be less than 0.7m, and when laid under the sidewalk, it should not be less than 0.5m.
2. The cable pipe should have a drainage slope of not less than 0.1%. 3. When connecting the cable pipe, the pipe holes should be aligned, the joints should be tight, and no groundwater and mud should penetrate.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 4
Preparation and Installation of Cable Brackets
Article 4.0.1 The processing of cable brackets shall meet the following requirements: 1. The steel shall be straight without obvious distortion. The material cutting error shall be within 5mm, and the cut shall be free of curling and burrs.
2. The bracket shall be welded firmly without significant deformation. The vertical clearance between each cross brace shall not exceed 5mm from the design deviation.
3. Metal cable brackets must be treated with anti-corrosion. When located in hot and humid areas, salt spray areas and chemical corrosion areas, special anti-corrosion treatment shall be performed according to the design. Article 4.0.2 The minimum allowable distance between layers of cable brackets, when there is no design regulation, can be adopted according to the regulations in Table 4.0.2. However, the clearance between layers shall not be less than twice the outer diameter of the cable plus 10mm, and the clearance between layers shall not be less than twice the outer diameter of the cable plus 50mm for high-voltage cables of 35kV and above.
The minimum allowable distance between layers of the cable support (mm) Cable type and laying characteristics
Control cable
10kv and below (except 6~10kv cross-linked polyethylene insulation) Electric
6~10kv cross-linked polyethylene insulation
35kv single-core
35kv three-core
110kv and above, more than 1 cable per layer
110kv and above, 1 cable per layer
The cable is laid in the trough box
Note: h represents the height of the trough box shell.
Support (suspension) frame
150~200
200~250
h+80h+100
Article 4.0.3 Cable supports should be installed firmly, horizontally and vertically, and the full text information system of the support and suspension frame engineering construction standard2. The processing of cable pipes shall meet the following requirements: 1. The pipe mouth shall be free of burrs and sharp edges, and the pipe mouth shall be made into a trumpet shape. 2. After bending, the cable pipe shall not have cracks and significant dents, and its bending degree shall not be greater than 10% of the outer diameter of the pipe; the bending radius of the cable pipe shall not be less than the minimum allowable bending radius of the inserted cable. 3. Metal cable pipes shall be coated with anti-corrosion paint or asphalt on the surface, and the galvanized pipes shall also be coated with anti-corrosion paint at the peeling zinc layer.
Article 3.0.3 The ratio of the inner diameter of the cable pipe to the outer diameter of the cable shall not be less than 1.5; in addition to meeting the above requirements, the inner diameter of concrete pipes, clay pipes, and asbestos cement pipes should not be less than 100mm.
Article 3.0.4 Each cable pipe shall have no more than 3 elbows and no more than 2 right-angle bends.
Article 3.0.5 Cable pipes shall meet the following requirements when laid openly: 1. Cable pipes shall be installed firmly; the distance between the support points of cable pipes shall not exceed 3m when there is no design regulation.
2. When the straight length of the plastic pipe exceeds 30m, an expansion joint should be installed. Article 3.0.6 The connection of cable pipes shall meet the following requirements: 1. The connection of metal cable pipes shall be firm, the seal shall be good, and the two pipe ends shall be aligned. The length of the short sleeve or threaded pipe joint shall not be less than 2.2 times the outer diameter of the cable pipe, and the metal cable pipe shall not be directly butt-welded. Engineering Construction Standard Full Text Information System
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Engineering Construction Standard Full Text Information System
2. When the hard plastic pipe is sleeved or plugged, the insertion depth should be 1.1~1.8 times the inner diameter of the pipe. The plug-in surface should be coated with adhesive to seal it firmly; when sleeved, both ends of the sleeve should be sealed and welded.
Article 3.0.7 The position of the outlet of the cable pipe leading to the equipment should be convenient for connection with the equipment and should not hinder the disassembly and installation and entry and exit of the equipment. The outlets of the cable pipes laid in parallel should be arranged neatly. Article 3.0.8 When using the protective steel pipe of the cable as the grounding wire, the grounding wire should be welded first; at the threaded pipe joints, jumper welding should be used before laying the cable. Article 3.0.9 When laying concrete, clay, asbestos cement and other cable pipes, the foundation should be solid and flat, and there should be no subsidence. The laying of cable pipes should meet the following requirements:
1. The buried depth of the cable pipe should not be less than 0.7m, and when laid under the sidewalk, it should not be less than 0.5m.
2. The cable pipe should have a drainage slope of not less than 0.1%. 3. When connecting the cable pipe, the pipe holes should be aligned, the joints should be tight, and no groundwater and mud should penetrate.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 4
Preparation and Installation of Cable Brackets
Article 4.0.1 The processing of cable brackets shall meet the following requirements: 1. The steel shall be straight without obvious distortion. The material cutting error shall be within 5mm, and the cut shall be free of curling and burrs.
2. The bracket shall be welded firmly without significant deformation. The vertical clearance between each cross brace shall not exceed 5mm from the design deviation.
3. Metal cable brackets must be treated with anti-corrosion. When located in hot and humid areas, salt spray areas and chemical corrosion areas, special anti-corrosion treatment shall be performed according to the design. Article 4.0.2 The minimum allowable distance between layers of cable brackets, when there is no design regulation, can be adopted according to the regulations in Table 4.0.2. However, the clearance between layers shall not be less than twice the outer diameter of the cable plus 10mm, and the clearance between layers shall not be less than twice the outer diameter of the cable plus 50mm for high-voltage cables of 35kV and above.
The minimum allowable distance between layers of the cable support (mm) Cable types and laying characteristics
Control cable
10kv and below (except 6~10kv cross-linked polyethylene insulation) Electric
6~10kv cross-linked polyethylene insulation
35kv single-core
35kv three-core
110kv and above, more than 1 cable per layer
110kv and above, 1 cable per layer
The cables are laid in the trough box
Note: h represents the height of the trough box shell.
Support (suspension) frame
150~200
200~250
h+80h+100
Article 4.0.3 Cable supports should be installed firmly, horizontally and vertically, and the full text information system of the support and suspension frame engineering construction standard2. The processing of cable pipes shall meet the following requirements: 1. The pipe mouth shall be free of burrs and sharp edges, and the pipe mouth shall be made into a trumpet shape. 2. After bending, the cable pipe shall not have cracks and significant dents, and its bending degree shall not be greater than 10% of the outer diameter of the pipe; the bending radius of the cable pipe shall not be less than the minimum allowable bending radius of the inserted cable. 3. Metal cable pipes shall be coated with anti-corrosion paint or asphalt on the surface, and the galvanized pipes shall also be coated with anti-corrosion paint at the peeling zinc layer.
Article 3.0.3 The ratio of the inner diameter of the cable pipe to the outer diameter of the cable shall not be less than 1.5; in addition to meeting the above requirements, the inner diameter of concrete pipes, clay pipes, and asbestos cement pipes should not be less than 100mm.
Article 3.0.4 Each cable pipe shall have no more than 3 elbows and no more than 2 right-angle bends.
Article 3.0.5 Cable pipes shall meet the following requirements when laid openly: 1. Cable pipes shall be installed firmly; the distance between the support points of cable pipes shall not exceed 3m when there is no design regulation.
2. When the straight length of the plastic pipe exceeds 30m, an expansion joint should be installed. Article 3.0.6 The connection of cable pipes shall meet the following requirements: 1. The connection of metal cable pipes shall be firm, the seal shall be good, and the two pipe ends shall be aligned. The length of the short sleeve or threaded pipe joint shall not be less than 2.2 times the outer diameter of the cable pipe, and the metal cable pipe shall not be directly butt-welded. Engineering Construction Standard Full Text Information System
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Engineering Construction Standard Full Text Information System
2. When the hard plastic pipe is sleeved or plugged, the insertion depth should be 1.1~1.8 times the inner diameter of the pipe. The plug-in surface should be coated with adhesive to seal it firmly; when sleeved, both ends of the sleeve should be sealed and welded.
Article 3.0.7 The position of the outlet of the cable pipe leading to the equipment should be convenient for connection with the equipment and should not hinder the disassembly and installation and entry and exit of the equipment. The outlets of the cable pipes laid in parallel should be arranged neatly. Article 3.0.8 When using the protective steel pipe of the cable as the grounding wire, the grounding wire should be welded first; at the threaded pipe joints, jumper welding should be used before laying the cable. Article 3.0.9 When laying concrete, clay, asbestos cement and other cable pipes, the foundation should be solid and flat, and there should be no subsidence. The laying of cable pipes should meet the following requirements:
1. The buried depth of the cable pipe should not be less than 0.7m, and when laid under the sidewalk, it should not be less than 0.5m.
2. The cable pipe should have a drainage slope of not less than 0.1%. 3. When connecting the cable pipe, the pipe holes should be aligned, the joints should be tight, and no groundwater and mud should penetrate.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 4
Preparation and Installation of Cable Brackets
Article 4.0.1 The processing of cable brackets shall meet the following requirements: 1. The steel shall be straight without obvious distortion. The material cutting error shall be within 5mm, and the cut shall be free of curling and burrs.
2. The bracket shall be welded firmly without significant deformation. The vertical clearance between each cross brace shall not exceed 5mm from the design deviation.
3. Metal cable brackets must be treated with anti-corrosion. When located in hot and humid areas, salt spray areas and chemical corrosion areas, special anti-corrosion treatment shall be performed according to the design. Article 4.0.2 The minimum allowable distance between layers of cable brackets, when there is no design regulation, can be adopted according to the regulations in Table 4.0.2. However, the clearance between layers shall not be less than twice the outer diameter of the cable plus 10mm, and the clearance between layers shall not be less than twice the outer diameter of the cable plus 50mm for high-voltage cables of 35kV and above.
The minimum allowable distance between layers of the cable support (mm) Cable types and laying characteristics
Control cable
10kv and below (except 6~10kv cross-linked polyethylene insulation) Electric
6~10kv cross-linked polyethylene insulation
35kv single-core
35kv three-core
110kv and above, more than 1 cable per layer
110kv and above, 1 cable per layer
The cables are laid in the trough box
Note: h represents the height of the trough box shell.
Support (suspension) frame
150~200
200~250
h+80h+100
Article 4.0.3 Cable supports should be installed firmly, horizontally and vertically, and the full text information system of the support and suspension frame engineering construction standard
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