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GB 50168-2018 PDF EnglishSearch result: GB 50168-2018_English: PDF (GB50168-2018)
GB50168-2018: PDF in EnglishGB 50168-2018 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA UDC P GB 50168-2018 Standard for construction and acceptance of cable line electric equipment installation engineering ISSUED ON: NOVEMBER 08, 2018 IMPLEMENTED ON: MAY 01, 2019 Issued by: Ministry of Housing and Urban-Rural Development of PRC; State Administration for Market Regulation. Table of Contents Foreword ... 5 1 General provisions ... 7 2 Terms ... 7 3 Basic requirements ... 9 4 Transportation and storage of cables and accessories ... 9 5 Cable line construction of ancillary facilities... 11 5.1 Processing and installation of cable ducts ... 11 5.2 The configuration and installation of cable holder ... 13 5.3 Cable line protection facilities and structures ... 15 6 Cable laying ... 16 6.1 General requirements ... 16 6.2 Buried cable laying ... 20 6.3 Intraductal cable laying ... 23 6.4 Cable laying structures ... 23 6.5 Cable laying on bridge ... 24 6.6 Submarine cable laying ... 25 6.7 Aerial cable laying ... 27 7 Cable accessories installation instructions ... 28 7.1 General requirements ... 28 7.2 Installation requirements ... 29 7.3 Online monitoring system of cable lines ... 32 8 Cable line fireproofing facilities construction ... 32 9 Engineering succession and acceptance ... 34 Appendix A Commonly used calculation formula of the lateral pressure and traction ... 37 Explanation of wording in this standard ... 39 Lists of quoted standards ... 40 Standard for construction and acceptance of cable line electric equipment installation engineering 1 General provisions 1.0.1 This standard is formulated in order to ensure the quality of cable line engineering construction, unify construction and acceptance criteria, standardize quality control requirements and acceptance conditions in the construction process. 1.0.2 This standard applies to the construction and acceptance of cable lines, which have a rated voltage of 500 kV and below, as well as their ancillary facilities. 1.0.3 The installation engineering of cable lines, which have special requirements, such as mines, ships, submarine, metallurgy, chemical industry, shall comply with the relevant provisions of relevant professional standards. 1.0.4 The construction and acceptance of cable lines shall not only comply with this standard, but also comply with the current relevant national standards. 2 Terms 2.0.1 Cable line The entire system, which is composed of cables, accessories, auxiliary equipment, and auxiliary facilities. 2.0.2 Metallic sheath Uniform and continuous sealed metal tubular cladding. 2.0.3 Armor A cladding consisting of metal strips or wires. It is usually used to protect cables from external mechanical forces. 2.0.4 Cable termination A device, which is installed at the end of a cable, to connect the cable to other electrical equipment or overhead power lines AND to maintain insulation up to the point of connection. 2.0.5 Cable joint A device, that connects the conductor, insulation, shielding layer and protective layer of the cable to the cable, to make the cable line continuous. 2.0.6 Flexible joint The intermediate joint, which is made by connecting unarmored cables under factory- controlled conditions, AND continuously armored with the cables. 2.0.7 Cable dividing box A special electrical connection equipment, which completes the collection and branching functions of the cable lines in the power distribution system, BUT generally does not have secondary auxiliary configurations, such as control and measurement. 2.0.8 Cable tunnel and cable line online monitoring system It is a system for monitoring, analyzing, auxiliary diagnosis, alarm, remote control of cable running status and cable tunnel and other line facilities. The monitoring system consists of six parts: field equipment, sensors, signal acquisition unit, monitoring host, monitoring sub-station, remote monitoring center. 2.0.9 Cable ducts A duct, in which the cable is laid, for protection purposes AND for easy pulling out of the cable for replacement after a cable failure. There are structural forms such as single duct and row duct, also known as cable tube. 2.0.10 Cable bearer A device, which is used to support and fix cables, is usually assembled by integral casting, profiles welding or fastener splicing. 2.0.11 Cable tray A continuous rigid structure system, which is composed of a tray (bracket) or a straight section of a ladder frame, a non-linear section, an accessory, a support hanger, etc., to support cables. 2.0.12 Cable buildings Structures such as cable trenches, shallow grooves, tunnels, interlayers, vertical (inclined) shafts, working shafts, which are specially used for laying cables or placing accessories. 2.0.13 Cable accessories Cable terminals, joints, oil-filled cable pressure boxes are collectively referred to as cable accessories. 2.0.14 Cable auxiliary equipments A general term for cable line components, such as cross interconnection boxes, grounding boxes, sheath protectors, monitoring systems. 2.0.15 Cable auxiliary facilities A general term for cable line components, such as cable ducts, brackets, bridges, structures. 3 Basic requirements 3.0.1 Cables, accessories, auxiliary equipment shall meet the requirements of product technical documents; they shall have product identification and qualification certificates. 3.0.2 Safety technical measures shall be formulated for the construction of cable lines. Construction safety technical measures shall comply with the provisions of this standard and product technical documents. 3.0.3 The mechanical strength, corrosion resistance, flame retardancy and other properties of the fasteners shall meet the relevant standards. When steel fasteners are used, except for anchor bolts, hot-dip galvanized products or products with equivalent hot-dip galvanized properties shall be used. 3.0.4 For cable lines with anti-interference requirements, anti-interference measures shall be taken, according to design requirements. 4 Transportation and storage of cables and accessories 4.0.1 The transportation and storage of cables and accessories shall comply with the requirements of product technical documents. It shall avoid strong vibration, overturning, moisture, corrosion. It shall ensure that the outer surface of the box and the components inside the box are not damaged. 4.0.2 During transportation and loading & unloading, the cables and cable reels shall be prevented from being damaged. Cable reels shall not be transported or stored flat. 4.0.3 Before transporting or rolling the cable reel, it shall ensure that the cable reel is firm AND the cable shall be wound tightly. The oil pipe -- between the oil-filled cable and the pressure oil tank -- shall be fixed without damage. The pressure oil tank shall be firm; the pressure value shall meet the technical requirements of the product. When rolling, follow the arrow on the cable reel or the direction in which the cable is tightened. 4.0.4 After the cables and their accessories arrive at the site, they shall be inspected 5 Cable line construction of ancillary facilities 5.1 Processing and installation of cable ducts 5.1.1 There shall be no perforations, cracks, obvious unevenness in the cable duct; the inner wall shall be smooth; the metal cable duct shall not be severely corroded; the performance of the plastic cable duct shall meet the design requirements. 5.1.2 The processing of the cable duct shall meet the following requirements: 1 The nozzle shall be free of burrs and sharp edges; 2 After the cable duct is bent, there shall be no cracks and obvious depressions; the degree of bending shall not be greater than 10% of the outer diameter of the duct; the bending radius of the cable duct shall not be less than the minimum allowable bending radius of the cable; 3 Metal cable ducts without anti-corrosion measures shall be coated with anti- corrosion paint on the outside; anti-corrosion paint shall also be painted on the peeling zinc layer of galvanized tubes. 5.1.3 The ratio -- of the inner diameter of the cable duct TO the outer diameter of the cable passing through -- shall not be less than 1.5. 5.1.4 There shall be no more than three elbows and no more than two right-angle bends for each cable duct. 5.1.5 The laying of cable ducts shall comply with the following requirements: 1 The direction of cable ducts shall be parallel or perpendicular to the ground; the cable ducts laid side by side shall be arranged neatly. 2 The cable duct shall be installed firmly and shall not be damaged. The distance between the fulcrums of the cable duct shall meet the design requirements. When there is no design requirement, the distance between the fulcrums of the metal tube should not be greater than 3 m; the distance between the fulcrums of the non- metallic tubes should not be greater than 2 m; 3 When the linear length of the plastic pipe exceeds 30 m, an expansion joint should be installed; the expansion joint shall avoid the fixed point of the plastic pipe. 5.1.6 When laying concrete cable ducts, the foundation shall be solid and flat, without subsidence. When laying low-alkali glass steel pipes and other compressive but not tensile cable ducts, it should set a reinforced concrete cushion under them. The direct buried laying of cable ducts shall meet the following requirements: 1 The buried depth of the cable duct shall not be less than 0.5 m. When passing under the drainage ditch, the distance from the bottom of the drainage ditch should not be less than 0.3 m; 2 The cable duct should have a drainage slope of not less than 0.2%. 5.1.7 The connection of the cable duct shall comply with the following requirements: 1 The materials and specifications of the two cable ducts, which are connected to each other, shall be consistent; 2 Metal cable duct s shall not .......Source: https://www.ChineseStandard.net/PDF.aspx/GB50168-2018 |