GB 50343-2012 PDF English
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Technical code for protection of building electronic information system against lightning
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GB 50343-2012: Technical code for protection of building electronic information system against lightning
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50343-2012
GB
UDC
NATIONAL STANDARD
P GB 50343-2012
Technical Code for Protection of Building Electronic
Information System against Lightning
Issued on. JUNE 11, 2012
Implemented on. DECEMBER 1, 2012
Jointly issued by. Ministry of Housing and Urban-Rural Development
(MHURD);
General Administration of Quality Supervision, Inspection
and Quarantine (AQSIQ) of the People's Republic of China.
NATIONAL STANDARD
Technical Code for Protection of Building Electronic
Information System against Lightning
Chief Development Department.
Sichuan Housing and Urban-Rural Construction Department
Approval Department.
Ministry of Housing and Urban-Rural Development of the People's
Republic of China (MOHURD)
Implementation Date.
December 1, 2012
Announcement of the Ministry of Housing and Urban-Rural
Development of the People's Republic of China (MOHURD)
No. 1425
Announcement on Publishing the National Standard of "Technical Code
for Protection of Building Electronic Information System against
Lightning"
"Technical Code for Protection of Building Electronic Information System against
Lightning" has been approved as a national standard with a serial number of GB 50343-2012,
which shall be implemented from December 1, 2012.5.1.2, 5.2.5, 5.4.2 and 7.3.3 thereinto
are compulsory provisions and must be enforced strictly. "Technical Code for Protection of
Building Electronic Information System against Lightning" (GB 50343-2004) shall be
abolished simultaneously.
Authorized by the Standard Rating Research Institute of MOHURD, this code is
published by China Architecture and Building Press.
Ministry of Housing and Urban-Rural Development of the People's Republic of China
(MOHURD)
June 11, 2012
Table of Contents
1.General Provisions... 8
2.Terms... 9
3.Division of Lightning Protection Zone... 12
4.Classification of Lightning Protection Level and Risk Assessment... 13
5.Lightning Protection Design... 16
6.Lightning Protection Construction... 31
7.Inspection and Acceptance... 35
8.Maintenance and Management... 37
Appendix B Risk Assessment Based on Risk Management... 41
Appendix C Lightning Current Parameters... 64
Appendix D Calculation of Lightning Magnetic Strength... 66
Appendix E Test Waveforms and Parameters of Signal SPD... 69
Appendix F The Statistics Table of Average Annual Thunderstorm Days for Main Cities in
China... 70
Explanation of Wording in This Standard... 71
List of Quoted Standards... 72
1.General Provisions
1.0.1 This code is formulated with a view to preventing and reducing the damage caused by
lightning on building electronic information system and protecting the safety of life and
property.
1.0.2 This code is applicable to the design, construction, acceptance, maintenance and
management of constructed, renovated and extended protection of building electronic
information system against lightning. This code is not applicable to the protection of building
electronic information system against lightning in explosive and fire hazard environments.
1.0.3 Protection of building electronic information system against lightning shall adhere to
the principle of prevention and safety first.
1.0.4 In the design for protection of building electronic information system against lightning,
external and internal lightning protection measures shall be coordinated according to the
characteristics of building electronic information system; an overall planning shall be made
according to the whole engineering requirements to achieve safety and reliability, advanced
technology as well as economy and rationality.
1.0.5 Comprehensive protection combining external and internal lightning protection
measures shall be adopted in the building electronic information system.
1.0.6 Corresponding protective measures shall be taken for the building electronic
information system according to environmental factors, lightning activity routines, the
immunity of lightning protection zone (LPZ) and system (where equipment is located) against
lightning electromagnetic impulse(LEMP), extent of damage in lightning stroke accidents as
well as significance of system equipment.
1.0.7 Protection of building electronic information system against lightning shall not only
comply with those specified in this code but also meet the requirements of the current relevant
standards of the nation.
2.Terms
2.0.1 Electronic information system
A man-machine system for the collection, processing, storage, transmission and search of
information according to certain application purpose and rule, consisting of computer,
communication equipment, process equipment, control equipment, electric/electronic device
and its associated support equipment and facility (including network), as well as other
electronic equipment.
2.0.2 Lightning protection zone (LPZ)
Specified lightning electromagnetic environment zone
2.0.6 Common earthing system
It refers to an earthing system which is made by connecting the lightning protection
system earthing device, building hardware, low-voltage distribution protection wire,
equipotential bonding terminal board or bonding bar, equipment protective earthing, shield
earthing, electrostatic earthing, and functional earthing, etc.
2.0.7 Natural earthing electrode
A general term for hardware, metal well casing and steel bar in concrete which also have
earthing function, but are not arranged specially for this purpose.
2.0.9 Main equipotential earthing terminal board
Metal board connecting multiple earthing terminals that is directly connected with the
earthing device
2.0.10 Floor equipotential earthing terminal board
Earthing terminal board which is arranged on the floor of building for the equipotential
bonding of local equipotential earthing terminal board
2.0.24 Measured limiting voltage
The maximum peak value of voltage that is measured across the wiring terminals of the
SPD during the application of impulses of specified waveform and amplitude
3.Division of Lightning Protection Zone
3.1 Classification of Regional Thunderstorm Day
3.1.1 Regional thunderstorm days shall be classified according to the average annual
thunderstorm days.
3.1.2 Regional thunderstorm days shall be subject to the local average annual thunderstorm
days published by the nation.
3.2 Division of Lightning Protection Zone
3.2.1 Different lightning protection zones shall be divided for the buildings requiring
protection and control of the LEMP environment according to the requirements of 3.2.2 of
this code.
3.2.3 The protected objects shall be placed in the lightning protection zones that the
electromagnetic properties are compatible with the tolerance capacities of such objects.
4.Classification of Lightning Protection Level and Risk Assessment
4.1 General Requirements
4.1.1 Risk assessment may be carried out for the building electronic information system
according to the methods specified in 4.2, 4.3 or 4.4 of this code.
4.2 Determine Lightning Protection Level by Efficiency of LPS
4.3 Determine Lightning Protection Level by the Importance, the Application and the
Value of building Electronic Information System
4.3.1 Lightning protection level may be determined for the building electronic information
system by the importance, the application and the value of the system according to Table
4.3.1.
4.4.3 Risk of lightning damage to the building, R, shall be calculated according to the
requirements of risk management, which shall be compared to the allowable value of risk.
5.Lightning Protection Design
5.1 General Requirements
5.1.1 Building electronic information system should be subjected to risk assessment and
taken with appropriate protection measures.
5.1.2 The electronic information system, if necessary, must be taken with equipotential
bonding and earthing protection measures.
5.1.5 For expanded and renovated engineering, both the above-mentioned data and the
following related data shall be collected.
5.2 The Equipotential Bonding and the Common Earthing System
5.2.1 The electronic information equipment in machine room shall be subjected to
equipotential bonding whose structure type shall adopt S-type, M-type or their combination
(Figure 5.2.1).
5.2.2 At the junctions between LPZ0A or LPZ0B and LPZ1, main equipotential earthing
terminal board shall be provided and be connected with earthing device for at least two points;
a floor equipotential earthing terminal board should be provided in each floor; the electronic
information system equipment room shall be provided with local equipotential earthing
terminal board (LEB).
5.2.4 For especially important building electronic information system, a special vertical
earthing trunk line, led from the main equipotential earthing terminal board and connected
with the steel bar or pressure-equalizing strap in each floor of the building, may be set up. The
earthing terminal board for each floor shall be connected with the earthing trunk line.
5.2.7 The earthing wire of room equipment shall not be directly introduced from lighting
receiving belt, iron tower and lightning protection downlead.
5.2.8 The metallic pipeline entering into building (including metallic pipes, power and
signal lines) shall be connected to the equipotential bonding terminal board nearby at the
entry. Adaptive power supply and signal SPDs shall be installed at the LPZ1 entrance so as to
fulfill the equipotential bonding of the live conductor of electronic information system.
6.Lightning Protection Construction
6.1 General Requirements
6.1.1 The lightning protection construction of building electronic information system shall
be carried out according to the requirements of this code and approved construction design
documents.
6.1.2 The lightning protection construction apparatus of building electronic information
system shall comply with the relevant current standards of the nation and shall be provided
with qualified certificates.
6.1.3 Builders of lightning protection construction shall be certified.
6.1.4 Test instruments and measuring tools shall be verified qualified and used within the
validity period.
6.2 Earthing-termination System
6.2.1 Artificial earthing electrode should be embedded more than 1m out of the apron slope
around the building, and its embedded depth shall not be less than 0.5m. Artificial earthing
electrode in tundra shall be embedded below the frozen soil layer.
6.3 Earthing Conductor
6.3.1 At least two connecting conductors shall be leaded out of the earthing device via
different places to be connected with indoor main equipotential earthing terminal board. The
joint of the earthing outgoing line and the earthing device shall be welded or heat sealing. The
joint point shall take anti-corrosion measures.
6.3.5 The connection of such natural earthing electrode as earthing conductor and metal
pipeline shall adopt reliable electrical connection method according to its process
characteristic.
6.4 Equipotential Earthing Terminal Board (Equipotential Bonding Bar)
6.4.1 Equipotential earthing terminal board shall be installed at the interfaces of LPZ with
material specifications meeting the design requirements, and be connected with earthing
device.
6.5 Surge Protective Device
6.5.1 The installation of power circuits SPD shall meet the following requirements.
7.Inspection and Acceptance
7.1 Inspection
7.2 Items for Acceptance
7.2.1 Earthing device acceptance shall cover the following items.
7.2.2 Earthing conductor acceptance shall cover the following items.
7.2.3 Equipotential earthing terminal board (equipotential bonding bar) acceptance shall
cover the following items.
7.2.4 Shielding Facility acceptance shall cover the following items.
7.3 Final Acceptance
7.3.1 After the completion of lightning protection projects, acceptance shall be carried out
by representatives of the organizations concerned.
7.3.2 During the final acceptance of lightning protection projects, items passing the
follow-up testing shall not be rechecked again. If the acceptance team holds it is necessary, it
may be rechecked.
7.3.5 Upon the completion of lightning protection projects, the construction organization
shall provide the following documents and data.
8.Maintenance and Management
8.1 Maintenance
8.1.1 The maintenance of lightning protection device is divided into periodic maintenance
and routine maintenance.
8.1.2 A thorough and periodical testing shall be carried out before the coming of
thunderstorm season each year.
8.1.6 The earthing resistance of the earthing device shall be tested; if the test value is greater
than the specified value, the earthing device and soil conditions shall be inspected to find out
the reason for change and effective rectification measures shall be taken.
8.1.7 The electrical continuity for the equipotential bonding of internal lightning protection
device and equipment (metal shell and rack) shall be tested, if the bonding position is loose or
disconnected, it shall be repaired timely.
8.2 Management
8.2.1 The lightning protection device shall be managed by full time or part time personnel
familiar with the lightning protection technology.
8.2.2 Management system shall be established after the lightning protection device has been
put into service. The design, installation, concealed work information and drawing, annual
inspection test record of lightning protection device shall be timely filed and kept well.
8.2.3 After the lightning stroke accident, damage caused by thunder shall be investigated
timely, analyze the reasons, put forward improved measures and report to competent
departments.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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