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1、DRAFT FOR DEVELOPMENT DD IEC TS 60695-7-51: 2002 Fire hazard testing Part 7-51: Toxicity of fire effluent Estimation of toxic potency: Calculation and interpretation of test results ICS 29.020; 13.220 ? Licensed Copy: London South Bank University, London South Bank University, Sun Dec 10 14:41:08 GM
2、T+00:00 2006, Uncontrolled Copy, (c) BSI DD IEC TS 60695-7-51:2002 This Draft for Development, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 13 September 2002
3、BSI 13 September 2002 ISBN 0 580 40352 1 National foreword This Draft for Development reproduces verbatim IEC TS 60695-7-51:2002. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature becaus
4、e the source document is an IEC Technical Specification which is not an international standard. It should be applied on this provisional basis, so that information and experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are requested s
5、o that UK experience can be reported to the international organization responsible for its conversion into an international Standard. A review of this publication will be initiated 2 years after its publication by the international organization so that a decision can be taken on its status at the en
6、d of its three-year life. The commencement of the review period will be notified by an announcement in Update Standards. According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into an international Standard. Comm
7、ents should be sent in writing to the Secretary of BSI Technical Committee GEL/89, Fire hazard testing, at 389 Chiswick High Road, London W4 4AL, giving the document reference and clause number and proposing, where possible, an appropriate revision of the text. A list of organizations represented on
8、 this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Se
9、arch” facility of the BSI Electronic Catalogue or of British Standards Online. Summary of pages This document comprises a front cover, an inside front cover, the ENV title page, pages 2 to 14, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the
10、 document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Sun Dec 10 14:41:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI SPCIFICATION TECHNIQUE CEI IEC TECHNICAL SPECIFICATION TS 60695-7-51 Premire
11、dition First edition 2002-03 Essais relatifs aux risques du feu Partie 7-51: Toxicit de leffluent du feu Estimation de la puissance toxique: Calcul et interprtation des rsultats dessai Fire hazard testing Part 7-51: Toxicity of fire effluent Estimation of toxic potency: Calculation and interpretatio
12、n of test results Numro de rfrence Reference number CEI/IEC/TS 60695-7-51:2002 PUBLICATION FONDAMENTALE DE SCURIT BASIC SAFETY PUBLICATION DD IEC TS 60695751:2002 Licensed Copy: London South Bank University, London South Bank University, Sun Dec 10 14:41:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
13、 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope. 6 2 Normative references . 6 3 Definitions 7 4 Principle of the method. 7 5 Method. 8 5.1 General. 8 5.2 Calculation of predicted toxic potency of effluent using FED principles 9 Annex A (informative) Illustrative example .11 Annex B (informative) Illustr
14、ative example: Calculation of FLD in a hypothetical fire, based on data from a tube furnace interlaboratory round-robin test.12 B.1 Assumptions12 B.2 Known reference data: toxic potency of component toxic gases.12 B.3 Calculations.12 B.3.1Mass loss integral, Dm 12 B.3.2 Volume yields calculated from
15、 tube furnace test data .13 B.3.3 Calculation of FLD13 Annex C (informative) Nomenclature14 DD IEC TS 60695751:2002 2 Licensed Copy: London South Bank University, London South Bank University, Sun Dec 10 14:41:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL ELECTROTECHNICAL COMMISSION _
16、FIRE HAZARD TESTING Part 7-51: Toxicity of fire effluent Estimation of toxic potency: Calculation and interpretation of test results FOREWORD 1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC
17、 National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to tec
18、hnical 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. The IEC collaborates closely with the International
19、Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each t
20、echnical committee has representation from all interested National Committees. 3)The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Commi
21、ttees in that sense. 4)In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national o
22、r regional standard shall be clearly indicated in the latter. 5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elemen
23、ts of this technical specification may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propos
24、e the publication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or the subject is still under technical development or where, for any other reason, there is the future but no immediate possibility
25、 of an agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC 60695-7-51, which is a technical specification, has been prepared by IEC technical committee 89:
26、 Fire hazard testing. It is to be used in conjunction with IEC 60695-7-50. It has the status of a group safety publication in accordance with IEC Guide 104. DD IEC TS 60695751:2002 3 Licensed Copy: London South Bank University, London South Bank University, Sun Dec 10 14:41:08 GMT+00:00 2006, Uncont
27、rolled Copy, (c) BSI The text of this technical specification is based on the following documents: Enquiry draftReport on voting 89/462/DTS89/495/RVC Full information on the voting for the approval of this technical specification can be found in the report on voting indicated in the above table. Ann
28、exes A, B and C are for information only. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until 2005. At this date, the publication will be reconfirmed; withdrawn; replaced by a
29、 revised edition, or amended. DD IEC TS 60695751:2002 4 Licensed Copy: London South Bank University, London South Bank University, Sun Dec 10 14:41:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTRODUCTION Over the past ten years, ISO TC92 SC3 has been tasked with examining methodologies for reduci
30、ng the toxic hazard from fire. This work has resulted in the ISO/TR 9122 series of guidance documents. Similarly, IEC TC89 WG7 is tasked with applying the guidance of ISO TC92 SC3 in the field of electrotechnical products, and has produced the IEC 60695-7 series of standards. Specifiers, legislators
31、 and purchasers of electrotechnical products have tried to ensure a reduction in toxic hazard from fires by utilising the results of small scale decomposition tests on materials, allied with chemical analysis of selected products. These analytical results are often used in calculations, frequently a
32、llied with the lethal exposure dose (LCt50) as an indicator of toxic potency, to calculate toxicity indices which are then used either to rank products, or to provide go/no go decisions on their suitability for particular applications. Because the material based toxic potency value must be multiplie
33、d by the mass loss rate of the product when exposed to heat/fire, it is not possible to infer that a material with a high toxic potency equates to a higher toxic hazard, or vice versa. For example, it is quite possible that a product made from a material with a low toxic potency could pose a greater
34、 toxic hazard than the same product made from a material of higher toxic potency, if the latter is more resistant to ignition, and/or, when ignited, burns (i.e. loses mass) more slowly than the former. In the light of the information given above, requirements for toxic potency based on data generate
35、d by the test method IEC 60695-7-50 (or any other) test method should not be included in specifications for materials or products unless it is supported by complementary tests to measure the mass loss rate under an appropriate scenario, or unless it is part of a documented hazard assessment that con
36、siders mass loss, exposure concentrations, time to escape, time to tenability, etc. The approach taken is consistent with the latest agreed-upon methodology as advanced by ISO TC92 SC3 and is based on the formalism that death from the effects of fire will occur if and when those exposed have accumul
37、ated a lethal dose of the toxic combustion products in the fire effluent. It is recognised that a lethal outcome is often expected once those exposed have encountered an incapacitating dose of such products and that the magnitude of this dose is often less than that required to cause death. Neverthe
38、less, since a detailed methodology for dealing with incapacitation is still under development and not yet complete within ISO TC 92, incapacitation is not specifically addressed in this technical specification. DD IEC TS 60695751:2002 5 Licensed Copy: London South Bank University, London South Bank
39、University, Sun Dec 10 14:41:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI FIRE HAZARD TESTING Part 7-51: Toxicity of fire effluent Estimation of toxic potency: Calculation and interpretation of test results 1 Scope This technical specification describes the calculation procedure for converting the
40、data generated by chemical analysis in IEC 60695-7-50 into predicted toxic potency data for material tested under defined conditions. This is in order to estimate the contribution of the fire effluent of an end-product or material to the toxic threat to life of the total fire effluent resulting from
41、 a fire scenario in which the end-product or material is involved. This method may also be suitable for converting data from other relevant test methods into predicted toxic potency, provided that the form and format of the data is compatible with that of IEC 60695-7-50. One of the responsibilities
42、of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. This method is intended to be consistent with the principles advanced in IEC 60695-7-3, and ISO/TR 9122-5. It is designed specifically to make use of results in the form
43、 expressed in the laboratory test method described in IEC 60695-7-50. Toxic potency values are only of use in toxic hazard estimations, and must not be used in isolation. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer
44、ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60695-7-1:1993, Fire hazard testing Part 7-1: Guidance on the minimization of toxic hazards due to fires involving electrotechnical products General IE
45、C 60695-7-3:1998, Fire hazard testing Part 7-3: Toxicity of fire effluent Use and interpretation of test results IEC 60695-7-50:, Fire hazard testing Part 7-50: Toxicity of fire effluent Estimation of toxic potency: Apparatus and test method 1 IEC Guide 104:1997, The preparation of safety publicatio
46、ns and the use of basic safety publications and group safety publications ISO/TR 9122-1:1989, Toxicity testing of fire effluents Part 1: General ISO/TR 9122-5:1993, Toxicity testing of fire effluents Part 5: Prediction of toxic effects of fire effluents _ 1 To be published DD IEC TS 60695751:2002 6
47、Licensed Copy: London South Bank University, London South Bank University, Sun Dec 10 14:41:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 13344:1996, Determination of the lethal toxic potency of fire effluents ISO/IEC 13943:2000, Fire safety Vocabulary 3 Definitions For the purpose of this techn
48、ical specification, definitions taken from ISO/IEC 13943, together with the following definitions apply: 3.1 effective dose 50 (ECt50) exposure dose (volume fraction multiplied by time, Ct) of a toxicant that, when inhaled, causes a specific observed effect in 50 % of a population all of which are t
49、he same species and all exposed under the same experimental conditions NOTE The observed effect is typically either a behavioural response indicative of incapacitation or death. The ECt50 for a lethal exposure is termed “LCt50 “, the lethal exposure dose. 3.2 fractional effective dose (FED) ratio of the exposure dose (Ct) to the effective exposure dose (ECt50) for the same fire effluent NOTE When FED = 1, the defined effect (i