GB/T 21431-2008 in English

《GB/T 21431-2008建筑物防雷装置检测技术规范》由TC258（全国雷电防护标准化技术委员会）归口，主管部门为国家标准化管理委员会。
本标准为首次发布。本标准规定了建筑物防雷装置的检测项目、检测要求和方法、检测周期、检测程序和检测数据整理。本标准适用于建筑物防雷装置的检测。 本标准主要采用了GB50057《建筑物防雷设计规范》和GB/T 17949.1-2000《接地系统的土壤电阻率、接地阻抗和地面电位测量导则　第1部分　常规测量》的规范性技术要素内容。同时参考了IEC 61024-1-2:1998《建筑物防雷　第1部分：通则　第2分部分：指南Ｂ―――防雷装置的设计、施工、维护和检查》（英文版）和IEC 62305系列防雷标准的规范性技术要素内容。

1 Scope

This standard specifies the inspection items, requirements, methods, cycle, and procedures of lightning protection system in building as well as the arrangement of inspection data.
This standard is applicable to the inspection of lightning protection system in building. The following conditions are out of the scope of this standard:
a) Railway system;
b) Vehicles, ships, aircraft, offshore installations;
c) Underground high pressure pipelines; pipe, power and telecommunication lines not connected to a building.

2 Normative References

The following documents contain provisions which, through reference in this standard, become provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to these specifications are encouraged to research whether the latest editions of these labels are applied or not. For any undated references, the latest edition of the normative document referred to applies.
GB 16895.3-2004 Electrical Installations of Buildings-Part 5-54: Selection and Erection of Electrical Equipment-Earthing Arrangements, Protective Conductors and Protective Bonding Conductors (IEC 60364-5-54: 2002, IDT)
GB 16895.4-1997 Electrical Installations of Buildings Part 5: Selection and Erection of Electrical Equipment Chapter 53: Switchgear and Controlgear (idt IEC 60364-5-53: 1994)
GB/T 16895.9-2000 Electrical Installations of Buildings--Part 7: Requirements for Special Installations or Locations--Section 707: Earthing Requirements for the Electrical Installation of Data Processing Equipment
GB 16895.12-2001 Electrical Installations of Buildings--Part 4: Protection for Safety--Chapter 44: Protection Against Overvoltages--Section 443: Protection Against Overvoltages of Atmospheric Origin or Due to Switching (idt IEC 60364-4-443: 1995)
GB/T 16895.16-2002 Electrical Installations of Buildings--Part 4: Protection for Safety--Chapter 44: Protection against Overvoltages--Section 444: Protection against Electromagnetic Interferences(EMI)in Installations of Buildings (IEC 60364-4-444: 1996, IDT)
GB/T 16895.17-2002 Electrical Installations of Buildings--Part 5: Selection and Erection of Electrical Equipment--Section 548: Earthing Arrangements and Equipotential Bonding for Information Technology Installations (IEC 60364-5-548: 1996, IDT)
GB 16895.22-2004 Electrical Installations of Buildings-Part 5-53: Selection and Erection of Electrical Equipment-Isolation, Switching and Control-Section 534: Devices for Protection against Overvoltages (IEC 60364-5-534: 2011 A1: 2002, IDT)
GB/T 17949.1-2000 Guide for Measuring Earth Resistivity, Ground Impedance and Earth Surface Potentials of a Ground System--Part 1: Normal Measurements (idt ANSI/IEEE 81: 1983)
GB 18802.1-2002 Surge Protective Devices Connected to Low-voltage Power Distribution Systems--Part 1: Performance Requirements and Testing Methods (IEC 61643-1: 1998, IDT)
GB/T 18802.21-2004 Low-voltage Surge Protective Devices-Part 21: Surge Protective Devices Connected to Telecommunications and Signalling Networks-Performance Requirements and Testing Methods (IEC 61643-21: 2000, IDT)
GB/T 19271.1-2003 Protection against Lightning Electromagnetic Impulse--Part 1: General Principles (IEC 61312-1: 1995, IDT)
GB/T 19663-2005 Terms for Lighting Protection of Information System
GB 50057-1994 Design Code for Protection of Structures against Lightning
GB 50174 Designing Code for Electronic Computer Room
GB 50303-2002 Code of Acceptance of Construction Quality of Electrical Installation in Building
GB/T 50312-2000 Code for Engineering Acceptance of Generic Cabling System for Building and Campus
IEC 61024-1: 1990 Protection of Structures against Lightning-Part 1: General Principles
IEC 61024-1-2: 1998 Protection of Structures against Lightning- Part 1-2: General Principles-Guide B-Design, Installation, Maintenance and Inspection of Lightning Protection Systems
IEC 61643-12: 2002 Surge Protective Device Connected to Low-voltage Power Distribution Systems- Selection and Application Principles
IEC 61643-22: 2004 Surge Protective Device Connected to Low-voltage Telecommunications and Signaling Networks- Selection and Application Principles
IEC 62305-1: 2005 Protection against Lightning-Part 1: General
IEC 62305-2: 2005 Protection against Lightning-Part 2: Risk Management
IEC 62305-3: 2005 Protection against Lightning-Part 3: Physical Damage to Structures and Life Hazard
IEC 62305-4: 2005 Protection against Lightning – Part 4: Electrical and Electronic Systems within Structures

3 Terms and Definitions

For the purposes of this standard, the following terms and definitions apply. See definitions in GB 50057, GB / T 17949.1, GB 18802.1 and relevant standards for universal terms and definitions which are not provided in this standard.
3.1
Lightning protection system, LPS
The complete system used to reduce physical damage to a structure due to lightning flashes, which consists of both external and internal lightning protection systems. Under specific circumstances, it may only consist of external or internal lightning protection system. Also known as the lightning protection device.
Note: this definition is changed from Definition 7.32 of GB/T 19663-2005.
3.2
External lightning protection system
LPS for direct lightning flash consisting of the air-termination system, down conductor and earthing device.
[Definition 7.41 of GB/T 19663-2005]
3.3
Internal lightning protection system
Internal lightning protection system consists of all other additional facilities except for external LPS and is used to reduce and protect electromagnetic effect generated by lightning current in a protection required space.
[Definition 7.36 of GB/T 19663-2002]

1 Scope
2 Normative References
3 Terms and Definitions
4 Inspection Items
5 Inspection Requirements and Methods
6 Inspection Cycle
7 Inspection Procedures
8 Inspection Data Sorting
Appendix A (Normative) Explosive Atmospheres and Fire Hazard Zoning and Lightning Protection Classification
Appendix B (Normative) Conversion between Impulse and Power Frequency Earthing Resistance of Earthing Device
Appendix C (Informative) Measurement of Magnetic Field Strength and Calculation of Shielding Efficiency
Appendix D (Normative) Measurement of Soil Resistivity
Appendix E (Informative) Main Performances and Parameters of Several Testing Apparatus
Appendix F (Informative) Lightning Protection System Check and Measure Table
Appendix G (Informative) Treatment of Frequent Check and Measure Problems
Appendix H (Normative) Explanation of Wording in This Code