【正文】 is standard, together with BS EN 623052:2020, BS EN 623053:2020 and BS EN 623054:2020, supersedes BS 6651:1999, which will be withdrawn on 31 August 2020. The UK participation in its preparation was entrusted to Technical Committee GEL/81, Protection against lightning. A list of anizations represented on GEL/81 can be obtained 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. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 Septemb er 2020 169。ENNE EUROP196。 English version Protection against lightning Part 1: General principles (IEC 623051:2020) Protection contre la foudre Partie 1: Principes g233。raux (CEI 623051:2020) Blitzschutz Teil 1: Allgemeine Grunds228。 Europ233。i sches Komitee f252。 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 623051:2020 E EN 623051:2020 Foreword The text of document 81/262/FDIS, future edition 1 of IEC 623051, prepared by IEC TC 81, Lightning protection, was submitted to the IECCENELEC parallel vote and was approved by CENELEC as EN 623051 on 20200201. 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or by endorsement (dop) 20201101 – latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 20200201 This European Standard makes reference to International Standards. Where the International Standard referred to has been endorsed as a European Standard or a homegrown European Standard exists, this European Standard shall be applied instead. Pertinent information can be found on the CENELEC web site. Endorsement notice The text of the International Standard IEC 623051:2020 was approved by CENELEC as a European Standard without any modification. – 3 – EN 623051:2020 CONTENTS Introduction ......................................................................................................................... .7 1 Scope ........................................................................................................................... .8 2 Normative references .................................................................................................... .8 3 Terms and definitions .................................................................................................... .8 4 Lightning current parameters ........................................................................................ 14 5 Damage due to lightning .............................................................................................. . 14 Damage to a structure ......................................................................................... 14 Effects of lightning on a structure ............................................................. 14 Sources and types of damage to a structure ............................................. 16 Damage to a service ............................................................................................ 17 Effects of lightning on a service................................................................ 17 Sources and types of damage to a service ............................................... 17 Types of loss ...................................................................................................... . 18 6 Need and economic convenience for lightning protection .............................................. 20 Need for lightning protection ............................................................................... . 20 Economic convenience of lightning protection ..................................................... . 21 7 Protection measures..................................................................................................... 21 Protection measures to reduce injury of living beings due to touch and step voltages .................................................................................................. ............ 21 Protection measures to reduce physical damage .................................................. 21 Protection measures to reduce failure of electrical and electronic systems ........... 22 Protection measures selection ............................................................................. 22 8 Basic criteria for protection of structures and services .................................................. 22 Lightning protection levels (LPL) .......................................................................... 23 Lightning protection zones (LPZ) ......................................................................... 27 Protection of structures ....................................................................................... 28 Protection to reduce physical damage and life hazard .............................. 28 Protection to reduce the failure of internal systems................................... 28 Protection of services ......................................................................................... . 29 Annex A (informative) Parameters of lightning current ........................................................ 30 Lightning flashes to earth .................................................................................... 30 Lightning current paramet