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GB 50168-2018: Standard for construction and acceptance of cable line electric equipment installation engineering
GB 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 and 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
pe...