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DESIGN ALBUM OF NATIONAL BUILDING STANDARD
14D504
(Replacing 03D501-4)
Grounding device installation
China Institute of Building Standard Design & Research
A E
FB B1 C1 D D1
Grounding device installation
Approved by: Ministry of Housing and Urban-Rural Development of the PRC.
Approval No. JZH [2014] No. 318
Chief editorial unit: Zhongmu Kuncang Engineering Company, Professional Expert Committee
on Strong Electricity Design of Standards for All-purpose Engineering Construction.
Unified No.: GJBT-1314
IMPLEMENTED ON: JANUARY 1, 2015
Album No.: 14D504
Head of chief editorial unit:
Technical head of chief
editorial unit:
Technical reviewer:
Design director:
A – Table of contents; B – Reviewer; B1 – Li Daoben; C – Proofreader; C1 – Cui Futao; D – Designer;
D1– Fan Jingchang; E – Album No.; F – Page
Table of Contents
Table of contents ……………………………………………………………………………………1
Instructions for compilation ………………………………………………………………………. 4
Grounding system
Schematic block diagram of grounding configuration for protection purposes ……………………6
Grounding system example ………………………………………………………………………...7
Schematic diagram of engineering project grounding configuration structure …………………….8
Examples of grounding measures in existing buildings ……………………………………………9
Grounding grids, grounding poles
Instructions for preparing grounding grid and grounding poles ………………………………….10
Installation of buried rod-type grounding pole ……………………………………………………15
Installation of buried tube-type grounding pole ………………………………………………...…16
Installation of buried angle steel grounding pole ………………………………………………….17
Installation of buried strap-type grounding pole ………………………………………………….18
Installation of buried plate-type grounding pole ………………………………………………….19
Installation of deeply buried grounding pole …………………………………………………….20
Installation of low resistance module vertical grounding pole ……………………………………21
Installation of artificial grounding pole buried in foundation …………………………………….22
Installation of grounding pole using steel bar in reinforced concrete foundation ……………….24
Grounding installation of steel pipe column without removing outer formwork …………………27
Installation of rod type, tube type and angle steel grounding pole using resistance reducing agent .28
Installation of strap-type and plate-type grounding pole using resistance reducing agent ……….29
Installation of underground ground resistance detection point ……………………………………30
Grounding wire connection ……………………………………………………………………….34
Exothermic soldering connection of grounding wire …………………………………………….36
Table of Contents Album No. 14D504
Reviewer Li Daoben Proofreader Cui Futao Designer
Fan
Jingchang
Page 2
Connection between indoor grounding wire and outdoor grounding grid ……………………………………...37
Installation of concealed grounding conductors and grounding grid detection points ………………………….38
Schematic diagram of how to use pressure equalizing belts in outdoor passages of substations ……………….40
Grounding conductors (wires)
Instructions for preparation of grounding conductors, main grounding terminals, and grounding trunks ……….41
Installation of main grounding terminal …………………………………………………………………………42
Main grounding terminal box insulated from metal box ………………………………………………………...43
Installation of pre-embedded general grounding terminals in reinforced concrete columns and walls …………44
Installation of grounding wire on brick and wood structure …………………………………………………….45
Installation of grounding wire on reinforced concrete ………………………………………………………….46
Installation of grounding wire in stucco layer …………………………………………………………………...47
Installation of the grounding wire along the cable bridge ………………………………………………………48
Installation of the ground wire along the wall of the cable ditch ……………………………………………….49
Installation of grounding wires in building expansion joints and settlement joints …………………………….50
Installation of grounding wire on light steel keel partition wall …………………………………………………51
Installation of grounding wire through the wall and through the floor plate ……………………………………52
Installation of using crane rail as grounding wire ………………………………………………………………53
Installation of grounding wire through door ……………………………………………………………………54
Installation of temporary grounding terminal …………………………………………………………………...55
Grounding examples
Instructions for the preparation of functional grounding and protective grounding ……………………………57
Impact of grounding fault on high voltage side of substation on low voltage system ………………………….60
Examples of grounding grids for independent distribution stations and substations …………………………….61
Examples of grounding configurations for distribution, substations, and power generation stations ………….62
Example of substation grounding in a single-power TN-S system ……………………………………………...63
Example of substation grounding in a single-power TN-C-S system …………………………………………...66
Example of grounding of substation in single power supply TN-C system …………………………………….72
Example of substation grounding for single-power TT system …………………………………………………75
Example of substation grounding in single-power IT system …………………………………………………...78
Example of substation grounding in single-bus segmented TN-C-S system ……………………………………81
Example of substation grounding in single-bus segmented TN-C system ……………………………………...86
Example of substation grounding in single-bus segmented TT system ………………………………………….90
Example of substation grounding in single-bus segmented TT system …………………………………………93
Example of substation grounding in multi-power TT system …………………………………………………...96
Schematic for grounding method of high voltage generator ……………………………………………………99
Example of resonant grounding method for high voltage generator ………………………………………….100
Example of low resistance grounding method for high voltage diesel generator ……………………………...103
Schematic diagram of grounding type of TT and TN diesel generator system ………………………………...105
Table of Contents Album No. 14D504
Reviewer Li Daoben Proofreader Cui Futao Designer
Fan
Jingchang
Page 3
Schematic diagram of grounding type of IT diesel generator system …………………………………………...106
Schematic diagram of the grounding of the public grid and diesel generator system ………………………….107
Schematic diagram of TN type grounding for diesel generator with multiple power supplies …………………110
Schematic diagram of TT type grounding for diesel generator with multiple power supplies ………………….111
Schematic diagram of the three-phase UPS output as TN-C system ……………………………………………112
Schematic diagram of the three-phase UPS output as TN-S system ……………………………………………113
Schematic diagram of the three-phase UPS output as IT system ……………………………………………….114
Schematic diagram of single-phase EPS-DC type functional grounding ……………………………………….115
Schematic diagram of DC system grounding type ………………………………………………………………116
Schematic diagram of overhead entry line grounding installation of TN system power ……………………….117
Grounding installation of low-voltage cable buried entry line ………………………………………………….118
Installation of grounding wires using insulated wires …………………………………………………………...119
Installation of grounding wires using metal conduit ……………………………………………………………120
Grounding installation of metal outer protective devices for busbar ducts …………………………………….121
Schematic diagram of repeated grounding method for PEN conductor in distribution box ……………………122
Grounding installation of exposed conductive part of equipment ………………………………………………123
Grounding installation of metal lamp post ………………………………………………………………………124
Schematic diagram of grounding method for road lighting TT system …………………………………………125
Schematic diagram of electromagnetic interference protection measures for information and power wires ….126
Anti-static grounding
Schematic diagram of grounding method for road lighting TT system …………………………………………127
Grounding installation of anti-static ground …………………………………………………………………….129
Installation of anti-static jumper wires for pipe fittings …………………………………………………………130
Grounding installation of anti-static air ducts …………………………………………………………………...131
Installation of anti-static jumper wires at railway rail ends of oil loading and unloading stations …………….132
Installation of anti-static grounding for train tank cars ………………………………………………………….134
Installation of anti-static grounding for oil tank vehicles ……………………………………………………….135
Examples of human electrostatic charge release balls and grounding engineering applications ……………….136
Related technical information ………………………………………………………………………………….137
General
Instructions for compilation
1 Compilation basis
1.1 It was complied according to the JZH [2012] No.131 “Notice on Issuing 2012 National Building Standard Design
and Compilation Work Plan”
1.2 Major standards and codes that were basis for this Album:
GB 16895.3-2004, Low-voltage electrical installations -- Part 5-54: Selection and erection of electrical equipment -
- Earthing arrangements and protective conductors
GB/T 16895.9-2000, Electrical installations of buildings. Part 7: Requirements for special installations or locations.
Section 707-Earthing requirements for the installation of data processing equipment
GB 16895.20-2003, Low-voltage electrical installations -- Part 5-55: Selection and erection of electrical equipment
-- Other equipment
GB/T 16895.1-2008, Low-voltage electrical installations -- Part 1: Fundamental principles, assessment of general
characteristics, definitions
GB/T 16895.10-2010, Low-voltage electrical installations -- Part 4-44: Protection for safety -- Protection against
voltage disturbances and electromagnetic disturbances
GB 14050-2008, Types and safety technical requirements of system earthing
GB/T 50065-2011, Types and safety technical requirements of system earthing
GB 50057-2010, Types and safety technical requirements of system earthing
GB 12158-2006, General guideline for preventing electrostatic accidents
GB 50074-2014, Code for design of oil depot
GB 50169-2006, Code for design of oil depot
GB 50303-2015, Code for acceptance of construction quality of building electrical engineering
IEC 60364-5-54:2011, Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment
- Earthing arrangements and protective conductors
When the standards and codes are revised or new standards and codes are published and implemented, the
contents of this Album that are inconsistent with the current engineering construction standards shall be
deemed invalid. When engineering and technical personnel refer to this Album, they shall distinguish the
applicable conditions and review and select the relevant contents of this Album.
2 Applicable Scope
This Album is applicable to the construction and installation of protective grounding, functional grounding,
lightning protective grounding and anti-static grounding configurations in general industrial and civil
buildings.
3 Main Contents
This Album is a revised version of the National Building Standard Design 03D501-4 "Grounding device
installation". The Album adds a variety of functional grounding types for low-voltage power generation
equipment, one-point grounding between the neutral point of the low-voltage distribution device power
supply and PE in multi-power supply systems, system grounding for low-voltage distribution single busbar
segmented wiring, and system grounding for high-voltage diesel power generation equipment., the mutual
influence of the voltages between the protective grounding of distribution transformers and the functional
grounding of low-voltage systems, the application of its components of grounding conductors specified in
IEC 60364-5-54:2011, the composition of the grounding network composed of different systems and device
grounding systems in engineering projects, electrostatic protection engineering applications, functional
information equipment grounding configuration, etc. It replaces 03D501-4.
4 Compilation method
4.1 The Album is compiled according to the categories of "Grounding system", "Grounding grid, grounding
pole", "Grounding conductor (wire)", "Anti-static grounding", and "Related technical materials".
4.2 The "Grounding system" of the Album includes preparation instructions, schematic block diagrams of
grounding configurations for protection purposes, examples of grounding configurations and protective
conductors, schematic diagrams of engineering project grounding configuration structures, examples of
grounding measures in existing buildings, etc., to facilitate understanding of the practices and components
of different grounding configuration systems.
4.3 According to the relevant regulations of GB 16895.3, GB/T 50065-2011 and GB/T 16895.10, the
grounding pole, grounding grid, main grounding terminal, grounding trunk, protective grounding, functional
grounding, anti-static grounding, design and installation construction are compiled in the Album.
Instructions for compilation Album No. 14D504
Reviewer Li Daoben Proofreader Cui Futao Designer
Fan
Jingchang
Page 4
4.4 The Album introduces the copper-aluminum composite strap recommended by the Ministry of Industry and
Information Technology as the material for the main grounding terminal and grounding trunk.
4.5 This Album recommends the nano-coating anti-corrosion grounding devices commonly used in chemical and
petrochemical projects.
4.6 This Album recommends the installation method of vertical grounding poles for deeply buried low-resistance
modules using drilling methods for places with high soil resistivity.
4.7 This Album incorporates an intelligent grounding resistance monitoring system for the safety requirements of
lightning protection and anti-static for equipment in explosive hazardous environments.
5 General requirements for grounding configurations
5.1 Depending on the requirements of the electrical installation, the grounding configuration can serve both or
separately as protective grounding and functional grounding. The requirements for protective grounding shall be
met first.
5.2 If there is a grounding pole inside the low-voltage installation, the grounding pole shall be connected to the main
grounding terminal with a grounding conductor.
5.3 When the device is powered by high voltage, the grounding configuration requirements involving high-voltage
power supply and low-voltage electrical devices shall comply with the provisions of Articles 7.2.5 and 7.2.6 of GB/T
50065-2011.
5.4 The ground connection in the grounding configuration requirements shall meet the following requirements:
5.4.1 The protection requirements for the device shall be reliable and applicable.
5.4.2 It can conduct ground fault current and protective earth conductor current into the ground without causing
harmful heat, thermal-mechanical, electromechanical stress and electric shock hazard due to the current.
5.4.3 If the grounding configuration also has functional grounding, it shall also meet the corresponding requirements
of functionality.
5.4.4 It withstands foreseeable external influences such as mechanical stress and corrosion.
5.5 The grounding configuration shall take into account the effects of high frequency currents expected to flow.
5.6 Protection against electric shock shall not be adversely affected by any foreseeable changes in grounded
electrical contacts, such as corrosion, drying or freezing.
5.7 When electrical devices such as distribution transformers are installed in the power distribution device
room of the building that supplies power, their grounding configuration shall be connected to the building's
foundation steel bars, etc.
5.8 The grounding of the lightning arrester protecting the distribution transformer shall share a grounding
configuration with the transformer protective grounding.
5.9 Outdoor box-type substations, independent building substations and power stations, and open-air storage
tanks shall be equipped with a ring grounding configuration around them.
Instructions for compilation Album No. 14D504
Reviewer Li Daoben Proofreader Cui Futao Designer
Fan
Jingchang
Page 5
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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