1、 IEC 60695-1-20 Edition 1.0 2016-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Fire hazard testing Part 1-20: Guidance for assessing the fire hazard of electrotechnical products Ignitability General guidance Essais relatifs aux risques du feu Partie 1-20: Lignes directrices pour lvaluation des risq
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20、ONAL STANDARD NORME INTERNATIONALE Fire hazard testing Part 1-20: Guidance for assessing the fire hazard of electrotechnical products Ignitability General guidance Essais relatifs aux risques du feu Partie 1-20: Lignes directrices pour lvaluation des risques du feu des produits lectrotechniques Allu
21、mabilit Lignes directrices gnrales INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 13.220.40, 29.020 ISBN 978-2-8322-3146-3 BASIC SAFETY PUBLICATION PUBLICATION FONDAMENTALE DE SCURIT Registered trademark of the International Electrotechnical Commission Marqu
22、e dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 60695-1-20:2016 IEC 2016 CONTENTS FOREWORD . 3 INTRODU
23、CTION . 5 1 Scope 6 2 Normative references. 6 3 Terms and definitions 7 4 Principles of ignitability 12 4.1 Gases . 12 4.1.1 Overview . 12 4.1.2 Flammability limits . 12 4.1.3 Arc fires . 12 4.2 Liquids 13 4.2.1 Overview . 13 4.2.2 Ignition parameters 13 4.2.3 Insulating liquids 13 4.3 Solids . 13 4
24、.3.1 Overview . 13 4.3.2 Parameters affecting ignition 14 4.3.3 Metals . 14 4.3.4 Carbon (graphite) and carbonaceous char 15 4.3.5 Reactive substances 15 4.3.6 Dust clouds 15 5 Consideration for the selection of test methods 15 5.1 General . 15 5.2 Fire scenario . 16 5.3 Ignition sources . 16 5.3.1
25、General . 16 5.3.2 Internal ignition sources . 16 5.3.3 External ignition sources 17 5.3.4 Arc ignition of materials 18 5.4 Types of test specimen 19 5.5 Test procedure and apparatus . 20 6 Use and interpretation of results 20 Annex A (informative) Examples of accidents due to arc fires in undergrou
26、nd hydroelectric power plants or urban substations 21 A.1 General . 21 A.2 Examples which are generally available (non-exhaustive list) . 21 A.2.1 Underground hydroelectric power plants . 21 A.2.2 Urban substations (non-exhaustive list) 21 Bibliography . 22 IEC 60695-1-20:2016 IEC 2016 3 INTERNATION
27、AL ELECTROTECHNICAL COMMISSION _ FIRE HAZARD TESTING Part 1-20: Guidance for assessing the fire hazard of electrotechnical products Ignitability General guidance FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national el
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37、ted in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identify
38、ing any or all such patent rights. International Standard IEC 60695-1-20 has been prepared by IEC technical committee 89: Fire hazard testing. This first edition of IEC 60695-1-20 cancels and replaces the first edition of IEC TS 60695-1- 20 published in 2008. This edition constitutes a technical rev
39、ision. This edition includes the following significant technical changes with respect to the previous edition: a) ISO 5660-1 has been added to the normative references; b) definitions of “pyrolysis” and “short-circuit” have been added to Clause 3; c) some text from the introduction has been moved to
40、 Clause 5 and is now part of the normative text; 4 IEC 60695-1-20:2016 IEC 2016 d) Clause 5 now contains several mandatory statements. The text of this standard is based on the following documents: FDIS Report on voting 89/1296/FDIS 89/1302/RVD Full information on the voting for the approval of this
41、 standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC Guide 51. In this standard, the terms defined
42、 in Clause 3 are printed in bold type. A list of all parts in the IEC 60695 series, published under the general title Fire hazard testing, can be found on the IEC website. The IEC 60695-1 series, under the general title Fire hazard testing, consists of the following parts: Part 1-10: Guidance for as
43、sessing the fire hazard of electrotechnical products General guidelines Part 1-11: Guidance for assessing the fire hazard of electrotechnical products Fire hazard assessment Part 1-12: Guidance for assessing the fire hazard of electrotechnical products Fire safety engineering Part 1-20: Guidance for
44、 assessing the fire hazard of electrotechnical products Ignitability General guidance Part 1-21: Guidance for assessing the fire hazard of electrotechnical products Ignitability Summary and relevance of test methods Part 1-30: Guidance for assessing the fire hazard of electrotechnical products Prese
45、lection testing procedures General guidelines Part 1-40: Guidance for assessing the fire hazard of electrotechnical products Insulating liquids The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/web
46、store.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IEC 60695-1-20:2016 IEC 2016 5 INTRODUCTION Fires are responsible for creating hazards to life and property as a result of the gener
47、ation of heat (thermal hazard), and also as a result of the production of toxic effluent, corrosive effluent and smoke (non-thermal hazard). Fires start with ignition and then can grow, leading in some cases to flash-over and a fully developed fire. Ignition resistance is therefore one of the most i
48、mportant parameters of a material to be considered in the assessment of fire hazard. If there is no ignition, there is no fire. For most materials (other than metals and some other elements), ignition occurs in the gas phase. Ignition occurs when combustible vapour, mixed with air, reaches a high en
49、ough temperature for exothermic oxidation reactions to rapidly propagate. The ease of ignition is a function of the chemical nature of the vapour, the fuel/air ratio and the temperature. In the case of liquids, the combustible vapour is produced by vaporization of the liquid, and the vaporization process is dependent on the temperature and chemical composition of the liquid. In the case of solids,
