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GB/T 21714.4-2015 English PDF

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GB/T 21714.4-2015: Protection against lightning -- Part 4: Electrical and electronic systems within structures
Status: Valid

GB/T 21714.4: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21714.4-2015	1414	Add to Cart	8 days	Protection against lightning -- Part 4: Electrical and electronic systems within structures	Valid
GB/T 21714.4-2008	RFQ	ASK	7 days	Protection against lightning -- Part 4: Electrical and electronic systems within structures	Obsolete

Similar standards

GB 19517 GB/T 25296 GB/T 24612.2 GB/T 45827 GB/T 21714.3 GB/T 21714.1

Basic data

Standard ID: GB/T 21714.4-2015 (GB/T21714.4-2015)
Description (Translated English): Protection against lightning -- Part 4: Electrical and electronic systems within structures
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K09
Classification of International Standard: 13.260
Word Count Estimation: 71,721
Date of Issue: 2015-09-11
Date of Implementation: 2016-04-01
Older Standard (superseded by this standard): GB/T 21714.4-2008
Quoted Standard: GB 16895.22-2004; GB/T 16935.1-2008; GB/T 17626.5-2008; GB/T 17626.9-2011; GB/T 17626.10-1998; GB/T 18802.12-2014; GB/T 21714.1-2015; GB/T 21714.2-2015; GB/T 21714.3-2015; GB 18802.1-2011; GB/T 18802.21-2004; GB/T 18802.22-2008
Adopted Standard: IEC 62305-4-2010, IDT
Regulation (derived from): National Standard Announcement 2015 No.25
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the risk in the building of electrical and electronic systems of lightning electromagnetic pulse protection measures (SPM) the design, installation, inspection, maintenance and testing of materials, to reduce the lightning electromagnetic pulse (LEMP) make it a permanent failure. This standard does not contain an internal system failure may result in lightning protection electromagnetic interference. But Appendix A profile can also be used to evaluate such harassment. Electromagnetic interference protection measures refer to IEC 60364-4-44 and IEC 61000. This standard can guide cooperation between designers and electrical and electronic systems designer protective measures in order to achieve the best protective effect. This standard does not address in detail the design of electrical and electronic systems themselves.

GB/T 21714.4-2015: Protection against lightning -- Part 4: Electrical and electronic systems within structures

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Protection against lightning - Part 4. Electrical and electronic systems within structures ICS 13.260 K09 National Standards of People's Republic of China Replace GB/T 21714.4-2008 Lightning protection Part 4. Electrical and electronic systems in buildings Protectionagainstlightning-Part 4.Electricalandelectronicsystems (IEC 62305-4.2010, IDT) Released on.2015-09-11 2016-04-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Content

Foreword V Introduction VI 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 SPM design and installation 4 4.1 General requirements 4 4.2 SPM Design 8 4.3 Lightning Protection Zone (LPZ) 8 4.4 Basic SPM 11 5 Grounding and connection network 12 5.1 General requirements 12 5.2 Grounding device 12 5.3 Connecting to the network 13 5.4 Connection row 17 5.5 Grounding at the LPZ boundary 17 5.6 Materials and dimensions of connecting parts 18 6 Magnetic Shielding and Wiring 18 6.1 General requirements 18 6.2 Space Shield 19 6.3 Internal Line Shield 19 6.4 Internal Line Wiring 19 6.5 External line shielding 19 6.6 Magnetic shielding materials and dimensions 19 7 SPD System 19 8 isolation interface 20 9 SPM Management 20 9.1 General requirements 20 9.2 SPM Management Plan 20 9.3 SPM inspection 21 9.4 Maintenance 22 Appendix A (informative) Fundamentals of Electromagnetic Environment Assessment in the LPZ Area 23 Appendix B (informative) Implementation of SPM in existing buildings 42 Appendix C (informative) Selection and installation of SPD systems 55 Appendix D (informative) SPD selection factors to consider 60 References 64 Figure 1 Basic principles for dividing different LPZs Figure 2 SPM (LEMP Protection Measures) Example 6 Figure 3 Example of lightning protection zone interconnection 9 Figure 4 Example of extended lightning protection zone 10 Figure 5 Example of a connection between a network and a grounding device to form a three-dimensional grounding system Figure 6 Factory grid grounding device 13 Figure 7 Equipotential bonding using building reinforcements 14 Figure 8 Equipotential bonding within a steel structure building 15 Figure 9 Conductive components of the internal system access to the connection network 16 Figure 10 Combination of internal system conductive components into the connection network 17 Figure A.1 LEMP condition resulting from lightning strikes 24 Figure A.2 Simulating the rising edge of the magnetic field with a damped oscillation 26 Figure A.3 Large space shield with steel and metal frame 27 Figure A.4 Space for installation of electrical and electronic systems in LPZn 28 Figure A.5 Using line wiring and line shielding measures to reduce the inductive effect 29 Figure A.6 Office Building SPM Example 30 Figure A.7 Estimation of the value of the magnetic field in direct lightning strikes 31 Figure A.8 Estimation of the value of the magnetic field in the vicinity of a lightning strike 33 Figure A.9 Distance sa depends on the radius of the ball and the size of the building 35 Figure A.10 Type of grille type large space shield 36 Figure A.11 Magnetic field strength inside the Type 1 grid type shield H1/MAX 37 Figure A.12 Magnetic field strength H1/MAX 37 in a Type 1 grid shield Figure A.13 Low current level test for shielding internal magnetic field estimates in buildings 38 Figure A.14 Induced voltage and current in the line loop 39 Figure B.1 Existing building SPM design steps 44 Figure B.2 Possibility of establishing a lightning protection zone LPZ in an existing building 45 Figure B.3 Place the shielded cable close to the plate to reduce the loop area 49 Figure B.4 Example of additional shielding with a metal plate 49 Figure B.5 Protection of antennas and other external equipment 50 Figure B.6 Intrinsic shielding provided by work escalators and piping 51 Figure B.7 Ideal laying position for the antenna tower cable (steel lattice antenna tower cross section) 51 Figure B.8 SPM upgrade of existing buildings 53 Figure C.1 Surge voltage between the live conductor and the connection bar 57 Figure D.1 Example SPD setup for Class I, II, and III tests 61 Figure D.2 Basic examples of lightning damage distribution in different sources and systems in buildings 61 Figure D.3 Basic example of average current distribution 62 Table 1 Minimum cross-sectional area of the connecting parts 18 Table 2 SPM Management Plan for New Buildings and Existing Buildings Changing Structure and Use 21 Table A.1 Damage source and equipment related parameters 24 Table A.2 Example 32 for I0/MAX=100kA and wm=2m Table A.3 Grid-type spatial shielding attenuation of plane wave magnetic field 33 Table A.4 Ball radius 35 when the maximum lightning current is 35 Table A.5 Example 35 for I0/MAX=100kA and wm=2m and corresponding SF=12.6dB Table B.1 Characteristics of the building and its surroundings 42 Table B.2 Installation Characteristics 43 Table B.3 Equipment characteristics 43 Table B.4 Other issues to be considered in the concept of protection 43 Table D.1 Preferred value of Iimp 60

Foreword

GB/T 21714 "Lightning Protection" consists of the following four parts. --- Part 1. General; --- Part 2. Risk Management; --- Part 3. Physical damage and life-threatening of buildings; --- Part 4. Electrical and electronic systems in buildings. This part is the fourth part of GB/T 21714. This part replaces GB/T 21714.4-2008 "Lightning Protection Part 4. Electrical and Electronic Systems in Buildings", and GB/T 21714- Compared with.2008, the main technical changes are as follows. --- Increased isolation interfaces that reduce conducted surges entering the building's lines (see 3.24, 4.4, Chapter 8, B.10, B.15.3); --- Modified the minimum cross-sectional area of the connecting parts (see Table 1); --- The calculation of the electromagnetic damage source of the internal system increases the first negative pulse current (see A.4); --- Considering the oscillation and induction phenomena on the SPD downstream line, the SPD voltage protection level has been improved (see C.2.1); --- Appendix C removed the content of coordination with SPD; --- Appendix D gives new considerations for SPD selection. This section uses the translation method equivalent to IEC 62305-4.2010 "Lightning Protection Part 4. Electrical and Electronic Systems in Buildings". The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. --- GB 18802.1-2011 Low-voltage surge protectors (SPD) Part 1. s. Requirements and test methods (IEC 61643-1.2005, MOD) --- GB/T 18802.21-2004 Low voltage surge protectors - Part 21. Surge protectors for telecommunication and signal networks (SPD)---Performance requirements and test methods (IEC 61643-21.2000, IDT) --- GB/T 18802.22-2008 Surge protectors (SPD) for low-voltage distribution systems - Part 22. Telecommunications and signal networks Surge Protector (SPD) Selection and Use Guidelines (IEC 61643-22.2004, IDT) Please note that some of the contents of this document may involve patents, and the issuing organization of this document is not responsible for identifying these patents. This part is proposed and managed by the National Lightning Protection Standardization Technical Committee (SAC/TC258). This section is responsible for drafting unit. Tianjin Zhongli Lightning Protection Technology Co., Ltd. Participated in the drafting of this section. Sichuan Zhongguang Lightning Protection Technology Co., Ltd., Beijing Lightning Protection Equipment Safety Testing Center, Industry and Letter Communication and Measurement Center of the Ministry of Information, Shanghai Dianke Electric Technology Co., Ltd., Shenzhen Lightning Protection Center, Zhejiang Leitai Electric Co., Ltd., Hunan Province Lei Center, Schneider Electric (China) Co., Ltd., Xiamen Daheng Technology Co., Ltd., Anhui Jinli Electric Technology Co., Ltd. The main drafters of this section. Sun Wei, Xue Wen'an, Wang Deyan, Yang Guohua, Guan Xiangshi, Song Pingjian, Li Rujian, Zhou Wei, Gao Bo, Tang Xiaofeng, Yu Liping, Sun Danbo, Li Hongbin, Cai Zhenxin, Wang Zhigang, Wang Daoping, Hou Zheng, Li Xin, Zeng Rui, Wang Fei. The previous versions of this section were released as follows. ---GB/T 21714.4-2008.

Introduction

As a source of damage, lightning is a high-energy phenomenon. Lightning releases hundreds of megajoules of energy, in electrical and electronic systems within buildings Compared to the energy of the order of millijoules that sensitive electronic devices can withstand, it is undoubtedly necessary to add protective measures to protect these devices. This standard is required due to the increasing economic losses caused by the failure of electrical and electronic systems due to lightning electromagnetic effects. One of the most Important electronic systems for data processing and storage, as well as for high-investment, large-scale, high-complexity plants (for cost and Safety factors, these factories do not allow production interruptions) of the process control and safety of the electronic system. As specified in GB/T 21714.1, lightning can cause different types of hazards in buildings. D1 damage to life due to electric shock; D2 Physical damage such as fire, explosion, mechanical damage and chemical leakage caused by lightning current, including sparks; D3 Internal system failure due to lightning electromagnetic pulse. GB/T 21714.3 describes protective measures to reduce the risk of physical damage and life injury, but does not include electrical and electronic systems. Protection. Therefore, this part of GB/T 21714 provides protection against the risk of permanent failure of electrical and electronic systems in buildings. data. Lightning Electromagnetic Pulse (LEMP) can cause permanent failure of electrical and electronic systems by. a) conducted and induced surges transmitted to the equipment by connecting wires; b) The effect of the radiated electromagnetic field acting directly on the device. Surge can occur outside or inside the building. --- The external surge of the building is generated by the lightning strike home line or the ground near it, and transmitted to the electrical and electronic systems via the line; --- The surge inside the building is generated by lightning strikes on or near the building. Note 1. Surge can also be generated by switching the switch inside the building, such as the disconnection of the inductive load. The generation of lightning electromagnetic coupling can be based on different mechanisms. --- Resistive coupling (such as the grounding resistance of the building grounding device or the cable shielding resistance); --- Magnetic field coupling (eg due to the loop formed by the lines in the electrical and electronic systems or the inductance of the connecting conductor); --- Electric field coupling (eg due to whip antenna reception). Note 2. The electric field coupling is much smaller than the magnetic field coupling and can be ignored. Radiated electromagnetic fields can be generated in the following ways. ---The lightning current flows through the lightning channel; --- part of the lightning current flowing through the conductor (such as the external LPS down conductor described in GB/T 21714.3, or as described in this section) Lightning current in the external space shield). Lightning protection Part 4. Electrical and electronic systems in buildings

1 Scope

This part of GB/T 21714 provides for the installation of lightning electromagnetic pulse protection (SPM) for electrical and electronic systems in buildings. Data for metering, installation, inspection, maintenance, and testing to reduce the risk of permanent failure of Lightning Electromagnetic Pulse (LEMP). This section does not cover the protection against lightning electromagnetic interference that may cause internal system failure. However, the information in Appendix A can also be used for evaluation. This harassment. For EMI countermeasures, see IEC 60364-4-44 [1] and IEC 61000 [2]. This section guides the collaboration between electrical and electronic system designers and the designer of the protective measures to achieve the best protection. This section does not cover the detailed design of the electrical and electronic systems themselves.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB 16895.22-2004 Electrical installations of buildings - Part 5-53. Selection and installation isolation, switching and control of electrical equipment Equipment Section 534. Overvoltage Protection Appliances (IEC 60364-5-53.2001, IDT) GB/T 16935.1-2008 Insulation of equipment in low-voltage systems - Part 1. Principles, requirements and tests (IEC 60664-1. 2007, IDT) GB/T 17626.5-2008 Electromagnetic compatibility test and measurement technology Surge (impact) immunity test (IEC 61000-4-5. 2005, IDT) GB/T 17626.9-2011 Electromagnetic compatibility test and measurement technology Pulse magnetic field immunity test (IEC 61000-4-9.2001, IDT) GB/T 17626.10-1998 Electromagnetic compatibility test and measurement technique - Damping oscillating magnetic field immunity test (IEC 61000-4- 10.1993, IDT) GB/T 18802.12-2014 Low voltage surge protectors (SPD) Part 12. Surge protector selection for low-voltage distribution systems And guidelines for use (IEC 61643-12.2008, IDT) GB/T 21714.1-2015 Lightning protection - Part 1. General (IEC 62305-1.2010, IDT) GB/T 21714.2-2015 Lightning protection Part 2. Risk management (IEC 62305-2.2010, IDT) GB/T 21714.3-2015 Lightning protection - Part 3. Physical and structural hazards of buildings (IEC 62305-3.2010, IDT) Low voltage surge protectors (SPD) Part 1 . Performance requirements for surge protectors for low-voltage distribution systems And test methods (Low-voltagesurgeprotectivedevices-Part 1. Surgeprotectivedevicesconnectedtolow- voltagepowerdistributionsystems-Requirementsandtests) IEC 61643-21 Low-voltage surge protectors (SPD) Part 21. Surge protector (SPD) performance for telecommunications and signal networks Requirements and test methods (Lowvoltagesurgeprotectivedevices-Part 21. Surgeprotectivedevicesconnectedto telecommunicationsandsignalingnetworks-Performancerequirementsandtestingmethods) Surge protectors (SPD) for low-voltage distribution systems - Part 22. Surge protectors for telecommunication and signal networks (SPD) Selection and Usage Guidelines (Low-voltagesurgeprotectivedevices-Part 22. Surgeprotectivedevices Connectedtotelecommunicationsandsignalingnetworks-Selectionandapplicationprinciples

3 Terms and definitions

The following terms and definitions as defined elsewhere in GB/T 21714 apply to this document. 3.1 Electrical system electricalsystem A system consisting of low voltage power supply components. 3.2 Electronic system Systems containing sensitive electronic components such as communication devices, computers, control and instrumentation systems, radio systems, power electronics. 3.3 Internal system internalsystem Electrical and electronic systems within the building. 3.4 Lightning protection lightningprotection; LP The entire system used for lightning protection of buildings, including their internal systems, objects, and people, typically including LPS and SPM. 3.5 Lightning protection device lightningprotectionsystem;LPS The entire system used to reduce the physical damage caused by lightning strikes on buildings. Note. LPS consists of two parts, the external and internal lightning protection system. 3.6 Lightning electromagnetic pulse lightningelectromagneticimpulse; LEMP All electromagnetic effects of lightning currents coupled through electrical resistance, inductance and capacitance, including surges and radiated electromagnetic fields. 3.7 Surge surge A transient that occurs in the form of overvoltage and/or overcurrent caused by LEMP. Note. Surge is also called power surge. 1) 1) Editor's Note. 3.8 Impact voltage rating ratedimpulsewithstandvoltagelevel Uw The impulse withstand voltage specified by the manufacturer for the equipment or its components is used to characterize its ability to withstand overvoltage. Note. This section only considers the withstand voltage between the live conductor and ground (see GB/T 16935.1-2007, definition 3.9.2). 3.9 Lightning protection level lightningprotectionlevel; LPL The ordinal number associated with a set of lightning current parameter values, the probability that the set of parameters does not exceed the maximum and minimum design values when lightning occurs in nature related. Note. The lightning protection level is used to design lightning protection measures based on a set of related parameter values of lightning current. 3.10 Lightning protection zone lightningprotectionzone; LPZ The area where the lightning electromagnetic environment is specified. Note. The area boundaries of lightning protection zones are not necessarily physical boundaries (such as walls, floors, ceilings, etc.). 3.11 LEMP protection measures LEMPprotectionmeasures SPM Measures to protect the LEMP effect from internal systems. Note 1. SPM is part of integrated lightning protection. Note 2. The term in the draft of the third edition of IEC 62305.1 is modified to SurgeProtectionMeasures. 2) 3.12 Grille type space shield grid-likespatialshield Magnetic shielding with opening features. Note. For buildings or rooms, it is suitable to use the natural metal components of the building to connect with each other (such as steel bars, metal frames and metal branches in concrete). Support, etc.). 3.13 Grounding device earthterminationsystem A component of the external LPS that conducts and distributes lightning currents into the earth. 3.14 Connection network bondingnetwork A network in which all metal components of a building and internal conductors (except live conductors) are interconnected. Note. "Connected network", also known as "lapped network", is a network formed by low-impedance electrical connections in order to avoid dangerous potential differences. 3) 3.15 Grounding system earthingsystem A complete system consisting of a grounding device and a connected network. 3.16 Surge protector surgeprotectivedevice; SPD A device used to limit transient overvoltages and shunt inrush currents, which contain at least one nonlinear component. Note. Surge protectors are also known as surge protectors, lightning protectors, lightning protection devices, lightning arresters, etc. 4) 2) Editor's Note. 3) Editor's Note. 4) Editor's Note. 3.17 SPD SPDtestedwithIimp tested with Iimp A SPD that withstands a partial lightning current of a typical waveform of 10/350 μs requires a corresponding impulse test current Iimp. Note. For power supply lines, the appropriate test current Iimp is defined by the Class I test procedure of IEC 61643-1.2005. 3.18 SPD SPDtestedwithIn tested with In A SPD that withstands an induced surge current of a typical waveform of 8/20 μs requires a corresponding impulse test current In. Note. For the supply line, t......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 21714.4-2015_English be delivered?

Answer: Upon your order, we will start to translate GB/T 21714.4-2015_English as soon as possible, and keep you informed of the progress. The lead time is typically 5 ~ 8 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 21714.4-2015_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 21714.4-2015_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 21714.4-2015?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 21714.4-2015 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.