1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication Protection against lightning Part 3: Physical damage to structures and life hazard BS EN 62305-3:2011BS EN 62305-3:2011 BRITISH STANDARD National foreword This British Standar
2、d is the UK implementation of EN 62305-3:2011. It was derived from IEC 62305-3:2010. It supersedes BS EN 62305-3:2006, which will be withdrawn on 27 May 2012. Parts 1, 3 and 4 of EN 62305 contain references to EN 62305-2:2011. This reference is incorrect since Part 2 is not due to be published until
3、 2012 to allow for the finalization of the CENELEC common modifications. Until EN 62305-2:2012 is published and adopted as BS EN 62305-2:2012, the existing BS EN 62305-2:2006 can continue to be used with the newly published BS EN 62305-1:2011, BS EN 62305-3:2011 and BS EN 62305-4:2011. The CENELEC c
4、ommon modifications have been implemented at the appropriate places in the text and are indicated by tags (e.g. ). The UK participation in its preparation was entrusted to Technical Committee GEL/81, Protection against lightning. A list of organizations represented on this committee can be obtained
5、on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. ISBN 978 0 580 61195 7 ICS 29.020; 91.120.40 This
6、 British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2011. BSI 2011 Amendments/corrigenda issued since publication Date Text affected EUROPEAN STANDARD EN 62305-3 NORME EUROPENNE EUROPISCHE NORM March 2011 CENELEC European Committee for Electr
7、otechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. E
8、N 62305-3:2011 E ICS 29.020; 91.120.40 Supersedes EN 62305-3:2006 + corr. Nov.2006 + corr. Sep.2008 + A11:2009English version Protection against lightning - Part 3: Physical damage to structures and life hazard (IEC 62305-3:2010, modified) Protection contre la foudre - Partie 3: Dommages physiques s
9、ur les structures et risques humains (CEI 62305-3:2010, modifie) Blitzschutz - Teil 3: Schutz von baulichen Anlagen und Personen (IEC 62305-3:2010, modifiziert) This European Standard was approved by CENELEC on 2011-01-02. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations
10、 which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This Euro
11、pean Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are
12、the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slove
13、nia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of the International Standard IEC 62305-3:2010, prepared by IEC TC 81, Lightning protection, together with common modifications prepared by the Technical Committee CENELEC TC 81X, Lightning protection, was submitted to the for
14、mal vote and was approved by CENELEC as EN 62305-3 on 2011-01-02. This European Standard supersedes EN 62305-3:2006 + corr. Nov.2006 + corr. Sep.2008 + A11:2009. This EN 62305-3:2011 includes the following significant technical changes with respect to EN 62305-3:2006 + corr. Nov.2006 + corr. Sep.200
15、8 + A11:2009: 1) Minimum thicknesses of metal sheets or metal pipes given in Table 3 for air-termination systems are assumed as not able to prevent hot-spot problems. 2) Steel with electro-deposited copper is introduced as material suitable for LPS. 3) Some cross-sectional areas of LPS conductors we
16、re slightly modified. 4) For bonding purposes, isolating spark gaps are used for metal installations and SPD for internal systems. 5) Two methods simplified and detailed are provided for evaluation of separation distance. 6) Protection measures against injuries of living beings due to electric shock
17、 are considered also inside the structure. 7) Improved information for LPS in the case of structures with a risk of explosion are given in Annex D (normative). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall
18、not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-01-02 latest date by which the national standards c
19、onflicting with the EN have to be withdrawn (dow) 2014-01-02 _ Endorsement notice The text of the International Standard IEC 62305-3:2010 was approved by CENELEC as a European Standard with agreed common modifications as given below. In the official version, for Bibliography, the following note has
20、to be added for the standard indicated: 2 IEC 61400-24 NOTE Harmonized as EN 61400-24. BS EN 62305-3:2011 EN 62305-3:2011 (E) 2 BS EN 62305-3:2011 EN 62305-3:2011 (E) 3 CONTENTS FOR E WORD 8 INTRODUCTION 11 1 Scope 12 2 Normative references 12 3 Terms and definitions 13 4 Lightning protection system
21、 (LPS) 16 4.1 Class of LPS . 16 4.2 Design of the LPS 17 4.3 Continuity of steelwork in reinforced concrete structures 17 5 External lightning protection system . 18 5.1 Gene ra l . 18 5.1.1 Application of an external LPS 18 5.1.2 Choice of external LPS 18 5.1.3 Use of natural components . 18 5.2 Ai
22、r-termination systems 19 5.2.1 Gene ra l 19 5.2.2 Positioning . 19 5.2.3 Air-terminations against flashes to the side of tall structures 20 5.2.4 Construction . 21 5.2.5 Natural components 21 5.3 Down-conductor systems 22 5.3.1 Gene ra l 22 5.3.2 Positioning for an isolated LPS . 23 5.3.3 Positionin
23、g for a non-isolated LPS 23 5.3.4 Construction . 24 5.3.5 Natural components 24 5.3.6 Test joints 25 5.4 Earth-termination system 25 5.4.1 Gene ra l 25 5.4.2 Earthing arrangement in general conditions . 26 5.4.3 Installation of earth electrodes 27 5.4.4 Natural earth electrodes. 28 5.5 Components 28
24、 5.5.1 Gene ra l 28 5.5.2 Fixing. 29 5.5.3 Connections . 29 5.6 Materials and dimensions 30 5.6.1 Materials 30 5.6.2 Dimensions 30 6 Internal lightning protection system 32 6.1 Gene ra l . 32 6.2 Lightning equipotential bonding . 33 6.2.1 Gene ra l 33 6.2.2 Lightning equipotential bonding for metal
25、installations . 33 6.2.3 Lightning equipotential bonding for external conductive parts. 34 6.2.4 Lightning equipotential bonding for internal systems . 35 BS EN 62305-3:2011 EN 62305-3:2011 (E) 4 6.2.5 Lightning equipotential bonding for lines connected to the structure to be protected . 35 6.3 Elec
26、trical insulation of the external LPS 36 6.3 .1 Gene ra l 36 6.3.2 Simplified approach . 37 6.3.3 Detailed approach . 37 7 Maintenance and inspection of an LPS . 38 7.1 Gene ra l . 38 7.2 Application of inspections . 38 7.3 Order of inspections . 38 7.4 Maintenance 38 8 Protection measures against i
27、njury to living beings due to touch and step voltages . 38 8.1 Protection measures against touch voltages . 38 8.2 Protection measures against step voltages . 39 Annex A (normative) Positioning the air-termination system . 40 Annex B (normative) Minimum cross-section of the entering cable screen in
28、order to avoid dangerous sparking 46 Annex C (informative) Evaluation of the separation distance s 47 Annex D (normative) Additional information for LPS in the case of structures with a risk of explosion . 53 Annex E (informative) Guidelines for the design, construction, maintenance and inspection o
29、f lightning protection systems . 60 Bibliography . 157 Figure 1 Protection angle corresponding to the class of LPS 20 Figure 2 Loop in a down-conductor 24 Figure 3 Minimum length l 1of each earth electrode according to the class of LPS 26 Figure A.1 Volume protected by a vertical air-termination rod
30、 . 40 Figure A.2 Volume protected by a vertical air-termination rod . 41 Figure A.3 Volume protected by a wire air-termination system 41 Figure A.4 Volume protected by isolated wires combined in a mesh according to the protection angle method and rolling sphere method . 42 Figure A.5 Volume protecte
31、d by non-isolated wires combined in a mesh according to the mesh method and the protection angle method 43 Figure A.6 Design of an air-termination system according to the rolling sphere me thod 44 Figure C.1 Values of coefficient k cin the case of a wire air-termination system 47 Figure C.2 Values o
32、f coefficient k cin the case of multiple down-conductors system 48 Figure C.3 Values of coefficient k cin the case of a sloped roof with air-termination on the ridge 50 Figure C.4 Examples of calculation of the separation distance in the case of multiple down-conductors with an interconnecting ring
33、of the down-conductors at each level 51 Figure C.5 Values of coefficient k c in the case of a meshed air-termination system, with a multiple down-conductors system . 52 Figure E.1 LPS design flow diagram 62 Figure E.2 LPS design for a cantilevered part of a structure . 68 Figure E.3 Measuring the ov
34、erall electrical resistance . 69BS EN 62305-3:2011 EN 62305-3:2011 (E) 5 Figure E.4 Equipotential bonding in a structure with a steel reinforcement . 71 Figure E.5 Typical methods of joining reinforcing rods in concrete (where permitted) 72 Figure E.6 Example of clamps used as joints between reinfor
35、cing rods and conductors . 73 Figure E.7 Examples for connection points to the reinforcement in a reinforced concrete wall 74 Figure E.8 Use of metallic facade as natural down-conductor system and connection of facade supports 78 Figure E.9 Connection of the continuous strip windows to a metal facad
36、e covering . 79 Figure E.10 Internal down-conductors in industrial structures . 82 Figure E.11 Installation of bonding conductors in reinforced concrete structures and flexible bonds between two reinforced concrete parts . 84 Figure E.12 Protection angle method air-termination design for different h
37、eights according to Table 2 . 88 Figure E.13 Isolated external LPS using two isolated air-termination masts designed according to the protection angle air-termination design method 89 Figure E.14 Isolated external LPS using two isolated air-termination masts, interconnected by horizontal catenary wi
38、re 90 Figure E.15 Example of design of an air-termination of a non-isolated LPS by air- termination rods . 91 Figure E.16 Example of design of an air-termination of a non isolated LPS by a horizontal wire according to the protection angle air-termination design method 92 Figure E.17 Protected volume
39、 of an air- termination rod on a sloped surface using the protection angle design method 93 Figure E.18 Design of an LPS air-termination conductor network on a structure with complicated shape 94 Figure E.19 Design of an LPS air-termination according to the protection angle method, mesh method and g
40、eneral arrangement of air-termination elements . 95 Figure E.20 Space protected by two parallel air-termination horizontal wires or two air-termination rods (r h t ) 96 Figure E.21 Three examples of design of non-isolated LPS air-termination according to the mesh method air-termination design 99 Fig
41、ure E.22 Four examples of details of an LPS on a structure with sloped tiled roofs . 101 Figure E.23 Air-termination and visually concealed conductors for buildings less than 20 m high, with sloping roofs 102 Figure E.24 Construction of an LPS using natural components on the roof of the s truc tu re
42、 104 Figure E.25 Positioning of the external LPS on a structure made of isolating material e.g. wood or bricks with a height up to 60 m with flat roof and with roof fixtures 105 Figure E.26 Construction of air-termination network on a roof with conductive covering where puncturing of the covering is
43、 not acceptable . 106 Figure E.27 Construction of external LPS on a structure of steel-reinforced concrete using the reinforcement of the outer walls as natural components . 107 Figure E.28 Example of an air-termination stud used on car park roofs 108 Figure E.29 Air-termination rod used for protect
44、ion of a metallic roof fixture with electric power installations which are not bonded to the air-termination system . 109 Figure E.30 Method of achieving electrical continuity on metallic parapet capping 110 Figure E.31 Metallic roof fixture protected against direct lightning interception, connected
45、 to air-termination system . 113BS EN 62305-3:2011 EN 62305-3:2011 (E) 6 Figure E.32 Examplesof lightning protection of a house with a TV antenna 116 Figure E.33 Installation of lightning protection of metallic equipment on a roof against a direct lightning flash . 117 Figure E.34 Connection of natu
46、ral air-termination rod to air-termination conductor . 119 Figure E.35 Construction of the bridging between the segments of the metallic facade plates . 120 Figure E.36 Installation of external LPS on a structure of insulating material with different roof levels . 123 Figure E.37 Five examples of ge
47、ometry of LPS conductors 124 Figure E.38 Construction of an LPS using only two down-conductors and foundation earth electrodes . 125 Figure E.39 Four examples of connection of earth-termination to the LPS of structures using natural down-conductors (girders) and detail of a test joint 129 Figure E.4
48、0 Construction of foundation earth ring for structures of different foundation design . 133 Figure E.41 Two examples of vertical electrodes in type A earthing arrangement . 135 Figure E.42 Meshed earth-termination system of a plant 138 Figure E.43 Example of an equipotential bonding arrangement . 14
49、5 Figure E.44 Example of bonding arrangement in a structure with multiple point entries of external conductive parts using a ring electrode for interconnection of bonding bars 146 Figure E.45 Example of bonding in the case of multiple point entries of external conductive parts and an electric power or communication line using an internal ring conductor for interconnection of the bonding bars 147 Figure E.46 Example of bond
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