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Equipotential bonding installation
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15D502-2015: PDF in English 15D502-2015
DESIGN ALBUM OF NATIONAL BUILDING STANDARD
15D502
(Replacing 02D501-2)
Installation of Equipotential Bonding
China Institute of Building Standard Design & Research
Installation of Equipotential Bonding
Approved by: Ministry of Housing and Urban-Rural Development of the PRC.
Approval No. JZH [2015] No. 185
Chief editorial units: China Aviation Planning, Construction and Development Co., Ltd., China Institute of Building Standard
Design & Research
Unified No.: GJBT-1353
IMPLEMENTED ON: AUGUST 1, 2015
Album No.: 15D502
Head of chief editorial unit:
Technical head of chief editorial unit:
Technical reviewer:
Design director:
Table of contents
A - Reviewer; A1 - Ding Jie; B - Proofreader; B1 - Su Biping; C - Designer; C1 - Niu Ben.
Table of contents
Album
No.
A Page
Table of contents ... 1
Instructions for compilation ... 2
Examples of main equipotential bonding practices
Schematic diagram of main equipotential bonding ... 10
Instructions for the example of main equipotential bonding practices ... 12
Diagram of the example of main equipotential bonding ... 13
Schematic diagrams of equipotential bonding for power incoming lines and information
incoming lines ... 17
Examples of local equipotential bonding practices
Example of local equipotential bonding for bathrooms ... 18
Example of local equipotential bonding for swimming pools and paddling pools ... 20
Example of local equipotential bonding for fountains ... 21
Example of local equipotential bonding for typical medical settings ... 22
Example of equipotential bonding for livestock breeding facilities ... 23
Example of local equipotential bonding for elevator shafts and distribution rooms ... 24
Example of equipotential bonding for typical outdoor electrical equipment ... 25
Examples of functional equipotential bonding practices
Basic types of equipotential bonding for electronic information equipment ... 26
Schematic diagram of equipotential bonding for electronic information rooms ... 27
Practices of equipotential bonding terminal boards
Practices of main equipotential bonding terminal boards (single-row terminals) ... 28
Practices of main equipotential bonding terminal boards (double-row terminals) ... 29
Practices of main equipotential bonding terminal boards (bracket method) ... 30
Schematic diagram of practices of local equipotential bonding terminal boards ... 31
Practices of branch connection and straight line connection of bonding lines ... 32
A1 B B1 C C1
Introductions for compilation Album No. 15D502
Reviewer Ding Jie Proofreader Su Biping Designer Niu Ben Page 2
Schematic diagram of open installation of the main equipotential bonding terminal boards
with protective cover ... 33
Schematic diagram of the installation method of equipotential bonding terminal board in
the
box ... 34
Connection method of equipotential bonding
Connection of bonding lines to various pipes (clamp method) ... 35
Connection of bonding lines to various pipes (welding method) ... 36
Jumper wire installation of equipotential bonding for meters ... 37
Connection of bonding lines to sanitary equipment and water pipes ... 38
Connection of bonding lines to wash basins and radiators ... 40
Connection of bonding lines to the shell of process equipment ... 41
Practices of embedded parts in reinforced concrete ... 42
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 50054-2011 Code for design of low voltage electrical installations
GB 50057-2010 Code for design protection of structures against lightning
GB 50055-2011 Code for design of electric distribution of general-purpose utilization
equipment
GB/T 50065-2011 Code for design of ac electrical installations earthing
GB 50303-2015 Code for acceptance of construction quality of building electrical
engineering
GB 50343-2012 Technical code for protection of building electronic information system
against lightning
GB/T 16895.10-2010 Low-voltage electrical installations - Part 4-44: Protection for safety
- Protection against voltage disturbances and electromagnetic disturbances
GB 16895.13-2012 Low-voltage electrical installations - Part 7-701: Requirements for
special installations or locations - Locations containing a bath or shower
GB 16895.21-2011 Low-voltage electrical installations - Part 4-41: Protection for safety -
Protection against electric shock
GB 16895.24-2005 Electrical installations of buildings - Part 7-710: Requirements for
special installations or locations - Medical locations
GB 16895.27-2012 Low-voltage electrical installations - Part 7-705: Requirements for
special installations or locations - Agricultural and horticultural premises
GB/T 17045-2008 Protection against electric shock - Common aspects for installation and
equipment
GB/T 18216.4-2012 Electrical safety in low voltage distribution systems up to 1000 V a.c.
and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures -
Part 4: Resistance of earth connection and equipotential bonding
IEC 62305-3:2010 Protection against lightning - Part 3: Physical damage to structures and
life hazard
IEC 60364-5-54:2011 Low-voltage electrical installations - Part 5-54: Selection and
erection of electrical equipment - Earthing arrangements and protective conductors
IEC 60364- 7-702:2010 Low-voltage electrical installations - Part 7-702: Requirements for
special installations or locations - Swimming pools and fountains
When the standards and codes are revised or new standards and codes are published and
implemented, any content that is inconsistent with current engineering construction
standards, restricted or obsolete technologies or products in this Album 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 Scope of application
This Album applies to the installation of protective equipotential bonding and functional
equipotential bonding in general industrial and civil buildings.
3 Instructions for editing and revision
3.1 The Album was edited and revised according to GB 50057-2010 “Code for design
protection of structures against lightning”.
3.2 According to GB 50054-2011 “Code for design of low voltage electrical installations”,
the definition, function, protection principle and application occasions of protective
equipotential bonding are discussed in detail.
3.3 In instructions for compilation, it discusses the functions and differences between
protective equipotential and functional equipotential.
Introductions for compilation Album No. 15D502
Reviewer Ding Jie Proofreader Su Biping Designer Niu Ben Page 3
3.4 It has modified the schematic diagram of main equipotential bonding in accordance
with IEC 62305-3:2010, see pages 10 ~ 12 of this Album. It has modified the examples of
the practice of main equipotential bonding.
3.5 It has modified the examples of the practice of equipotential bonding in bathrooms,
swimming pools, fountains, etc.
3.6 It has added the examples of local equipotential bonding in elevator shafts and power
distribution rooms, and equipotential bonding of typical outdoor electrical equipment.
3.7 It has modified the examples of the practice of functional equipotential bonding.
3.8 It has deleted the practice of sliding equipotential bonding terminals.
3.9 It has modified the practice of main equipotential bonding terminal boards and added
the practice of local equipotential bonding terminal boards.
3.10 In addition to retaining the local equipotential bonding radial wiring method in the
Album, it has added a laying and wiring scheme for wire connectors in accordance with
GB 50303-2015 “Code for acceptance of construction quality of building electrical
engineering”.
4 Overview of this Album
The function of equipotential bonding is mainly to transmit potential rather than transmit
current.
There are two types of equipotential bonding in buildings: one is protective equipotential
bonding, which is carried out for safety purposes (such as preventing personal electric
shock); the other is functional equipotential bonding, of which the function is to make
various electrical systems work normally and play their due role.
5 Protective equipotential bonding
Protective equipotential bonding is divided into three categories according to the scope of
its equipotential bonding: main equipotential bonding, supplementary equipotential
bonding and local equipotential bonding.
Equipotential bonding can more effectively reduce contact voltage values, prevent fault
voltages introduced from outside the building from causing harm to people, and improve
electrical safety levels.
5.1 Main equipotential bonding
Main equipotential bonding acts on the entire building, which to a certain extent can reduce
the contact voltage of indirect electric shocks in the building and the potential difference
between different metal parts, and eliminate the hazards of dangerous fault voltages
introduced from outside the building through electrical lines and various metal pipes.
According to subclause 5.2.4 of GB 50054-2011 “Code for design of low voltage electrical
installations”, the main equipotential bonding in the building shall comply with the
following regulations:
1 The following conductive parts in each building shall be subject to main equipotential
bonding:
1) Main protective conductors (protective earth conductors, protective earth neutral
conductors),
2) Main earth conductors or main earth terminal boards of the electrical installation;
3) Various metal main pipes such as water pipes, gas pipes, heating and air conditioning
pipes in the building;
4) Accessible metal structural parts of the building.
2 The extraneous conductive parts specified in subclause 1 of this clause shall be generally
subject to equipotential bonding at the point closest to the entrance point in the building.
3 When making equipotential bonding for the metal outer sheath of communication cables,
the consent of the relevant departments shall be obtained.
The earth busbar shall be set at or as close as possible to the interface between the two
lightning protection zones. Acceptable metal structural parts of buildings: refer to the rebars
in building components such as floors, beams, columns, and foundations that are easy to
bond during construction. These rebars must be utilized to make them part of the main
equipotential bonding
If there are multiple power incoming lines in a building, a earth busbar shall be installed
near the power incoming line box (main distribution box) at each power incoming line, and
the main equipotential bonding shall be implemented, to reduce the potential difference
occurs in the event of an earth fault between the metal shell of the electrical equipment
within the power supply range of each power incoming line and its adjacent conductive part
outside the installation. Each main equipotential bonding system must be connected. If not,
when an earth fault occurs within the power supply range of a certain power incoming line,
the potential of the conductive part of the electrical installation within the range and the
conductive part outside the installation will increase, while that within the range of other
power incoming lines is no increase, the potential difference between the two will cause an
electrical accident.
The PE busbar in the incoming line main distribution cabinet (box) cannot replace the
dedicated earth busbar. Because there are phase busbars and other metal conductive parts
with dangerous voltages in the main distribution cabinet (box), it is easy to accidentally
touch them during detection, which may cause earth faults and personal electric shock
accidents, so the earth busbar must be set separately.
5.2 Supplementary equipotential bonding and local equipotential bonding
Although main equipotential bonding can greatly reduce the contact voltage, if a building
is far away from the power supply and the protection circuit in the building is too long, the
action time and contact voltage of the protective appliance may exceed the specified limit.
In this case, supplementary equipotential bonding or local equipotential bonding measures
can be taken.
The supplementary equipotential bonding within the IEC 60364 standard is the bonding
between conductive parts that can be reached simultaneously within a 2.5 m arms reach.
Supplementary equipotential bonding can reduce the potential difference that may occur
within the 2.5 m arms reach to zero volts or close to zero volts.
Local equipotential bonding can be regarded as “main equipotential bonding” within a local
range, but its relationship with the main equipotential bonding is not the superior-
subordinate relationship between the main distribution box and the distribution box. Local
equipotential bonding reduces the expected contact voltage in the event of an earth fault
below the contact voltage limit.
Local equipotential bonding or supplementary equipotential bonding is required under the
following circumstances:
Introductions for compilation Album No. 15D502
Reviewer Ding Jie Proofreader Su Biping Designer Niu Ben Page 4
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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