IEC 60695-8-1-2016 Fire hazard testing - Part 8-1 Heat release - General guidance《着火危险试验.第8-1部分 放热.一般指南》.pdf

1、 IEC 60695-8-1 Edition 3.0 2016-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Fire hazard testing Part 8-1: Heat release General guidance Essais relatifs aux risques du feu Partie 8-1: Dgagement de chaleur Guide gnral IEC 60695-8-1:2016-11(en-fr) BASIC SAFETY PUBLICATION PUBLICATION FONDAMENTALE DE

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19、s commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60695-8-1 Edition 3.0 2016-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Fire hazard testing Part 8-1: Heat release General guidance Essais relatifs aux risques du feu Partie 8-1: Dgagement de chaleur

20、Guide gnral INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 13.220.40; 29.020 ISBN 978-2-8322-3749-6 BASIC SAFETY PUBLICATION PUBLICATION FONDAMENTALE DE SCURIT Registered trademark of the International Electrotechnical Commission Marque dpose de la Commissio

21、n 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 60695-8-1:2016 IEC 2016 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 No

22、rmative references 7 3 Terms and definitions 7 4 Principles of determining heat release . 11 4.1 Complete combustion measured by the oxygen bomb calorimeter . 11 4.2 Incomplete combustion . 12 4.2.1 Measurement techniques . 12 4.2.2 Heat release by oxygen consumption . 12 4.2.3 Heat release by carbo

23、n dioxide generation 13 4.2.4 Heat release by increase of gas temperature . 13 5 Parameters used to report heat release data . 15 5.1 Heat of combustion (gross and net) 15 5.2 Heat release rate (HRR) . 15 5.3 Heat release (HR) . 16 5.4 Heat release rate per unit area (HRR*) . 16 5.5 Total heat relea

24、se . 17 5.6 Peak heat release rate 17 5.7 Time to peak heat release rate 17 5.8 Effective heat of combustion . 17 5.8.1 Measurement and calculation 17 5.8.2 Examples. 18 5.9 FIGRA index . 19 5.10 ARHE and MARHE . 20 6 Considerations for the selection of test methods 22 6.1 Ignition sources 22 6.2 Ty

25、pe of test specimen . 22 6.3 Choice of conditions . 22 6.4 Test apparatus 22 6.4.1 General . 22 6.4.2 Small-scale fire test apparatus . 22 6.4.3 Intermediate and large-scale fire test apparatus 23 6.4.4 Comparison between small-scale and intermediate/large-scale fire test methods 23 6.5 Choice of fi

26、re tests 23 7 Relevance of heat release data . 23 7.1 Contribution to fire hazard . 23 7.2 Secondary ignition and flame spread 23 7.3 Determination of self-propagating fire thresholds 24 7.4 Probability of reaching flash-over 24 7.5 Smoke and toxic gas production . 24 7.6 The role of heat release te

27、sting in research and development . 24 Bibliography 25 IEC 60695-8-1:2016 IEC 2016 3 Figure 1 Heat release rate (HRR) curve . 16 Figure 2 Heat release (HR) curve . 16 Figure 3 Heat release rate per unit area (HRR*) curve . 17 Figure 4 Mass loss curve . 18 Figure 5 FIGRA curve derived from Figure 1 1

28、9 Figure 6 Illustrative HRR curve 20 Figure 7 FIGRA curve derived from Figure 6 20 Figure 8 ARHE curve derived from Figure 1 . 21 Figure 9 ARHE curve derived from Figure 6 . 21 Table 1 Relationship between heat of combustion expressed in units of kJg 1of fuel burned and kJg 1of oxygen consumed for a

29、 variety of fuels 14 Table 2 Relationship between heat of combustion expressed in units of kJg 1of fuel burned and kJg 1of oxygen consumed for a variety of insulating liquids 15 4 IEC 60695-8-1:2016 IEC 2016 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIRE HAZARD TESTING Part 8-1: Heat release Gener

30、al guidance FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardiz

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32、 entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the

33、International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects s

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36、e in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

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40、 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 identifying any or all such patent rights. International Standard IEC 60695-8-1 has been prepared by IEC technical committee 89: Fire hazard testing. This thi

41、rd edition cancels and replaces the second edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) a modified Introduction; b) reference to IEC 60695-1-12; c) updated normativ

42、e references; d) revised terms and definitions; e) new text in 4.2.2, 4.2.3, 6.1 and 6.4, including several mandatory statements; f) mandatory statements in a new Subclause 6.5. IEC 60695-8-1:2016 IEC 2016 5 The text of this standard is based on the following documents: FDIS Report on voting 89/1342

43、/FDIS 89/1348/RVD Full information on the voting for the approval of this 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 wit

44、h IEC Guide 104 and ISO/IEC Guide 51. This standard is to be used in conjunction with IEC 60695-8-2. A list of all the parts in the IEC 60695 series, under the general title Fire hazard testing, can be found on the IEC website. IEC 60695-8 consists of the following parts: Part 8-1: Heat release Gene

45、ral guidance Part 8-2: Heat release Summary of test methods The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the pub

46、lication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 IEC 60695-8-1:2016 IEC 2016 INTRODUCTION In the design of any electrotechnical product, the risk of fire and the potential hazards associated with fire need to be considered. In this respect the objective of compon

47、ent, circuit and equipment design as well as the choice of materials is to reduce the risk of fire to a tolerable level even in the event of reasonably foreseeable (mis)use, malfunction or failure. IEC 60695-1-10 1 1provides guidance on how this is to be accomplished. Fires involving electrotechnica

48、l products can be initiated from external non-electrical sources. Considerations of this nature are dealt with in an overall risk assessment. The aim of the IEC 60695 series of standards is to save lives and property by reducing the number of fires or reducing the consequences of the fire. This can

49、be accomplished by: trying to prevent ignition caused by an electrically energised component part and, in the event of ignition, to confine any resulting fire within the bounds of the enclosure of the electrotechnical product; trying to minimise flame spread beyond the products enclosure and to minimise the harmful effects of fire effluents including heat, smoke, and toxic or corrosive