1、 IEC 60754-2 Edition 2.0 2011-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Test on gases evolved during combustion of materials from cables Part 2: Determination of acidity (by pH measurement) and conductivity Essai sur les gaz mis lors de la combustion des matriaux prlevs sur cbles Partie 2: Dter
2、mination de la conductivit et de lacidit (par mesure du pH) IEC60754-2:2011GROUP SAFETY PUBLICATION PUBLICATION GROUPE DE SCURIT THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reprodu
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17、es evolved during combustion of materials from cables Part 2: Determination of acidity (by pH measurement) and conductivity Essai sur les gaz mis lors de la combustion des matriaux prlevs sur cbles Partie 2: Dtermination de la conductivit et de lacidit (par mesure du pH) INTERNATIONAL ELECTROTECHNIC
18、AL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE R ICS 13.220.40; 29.020; 29.060.20 PRICE CODE CODE PRIX ISBN 978-2-88912-716-0 GROUP SAFETY PUBLICATION PUBLICATION GROUPE DE SCURIT Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotec
19、hnique Internationale 2 60754-2 IEC:2011 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 7 4 Test method principle . 8 5 Test apparatus . 8 5.1 General . 8 5.2 Tube furnace . 8 5.3 Quartz glass tube 8 5.4 Combustion boats . 8 5.5 Bubbling devic
20、es for gases 9 5.6 Air supply system 9 5.7 Analytical balance . 10 5.8 Laboratory glassware 10 5.9 pH meter . 10 5.10 Conductivity measuring device 10 6 Test specimen 10 6.1 General . 10 6.2 Conditioning of specimen 10 6.3 Mass of specimen . 10 7 Test procedure . 11 7.1 General . 11 7.2 Test apparat
21、us and arrangement . 11 7.3 Heating procedure . 11 7.4 Washing procedure . 11 7.5 Determination of the pH value and conductivity . 11 8 Evaluation of the test results 12 8.1 General method . 12 8.2 Simplified method 12 8.3 Weighted values 12 8.3.1 Value of pH . 12 8.3.2 Conductivity. 13 9 Performanc
22、e requirement . 13 10 Test report 13 Annex A (informative) Recommended performance requirements 19 Bibliography 20 Figure 1 Device for inserting combustion boat and test specimen 14 Figure 2 Example of a gas washing bottle 15 Figure 3 Test apparatus: method 1 Use of synthetic or compressed air from
23、a bottle 16 Figure 4 Test apparatus: method 2 Use of laboratory compressed air supply 17 60754-2 IEC:2011 3 Figure 5 Test apparatus: method 3 Use of ambient air sucked by means of a suction pump 18 4 60754-2 IEC:2011 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ TEST ON GASES EVOLVED DURING COMBUSTION
24、 OF MATERIALS FROM CABLES Part 2: Determination of acidity (by pH measurement) and conductivity FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of
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31、 any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest
32、 edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whethe
33、r direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indi
34、spensable 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 identifying any or all such patent rights. International Standard IEC 60754
35、-2 has been prepared by IEC technical committee 20: Electric cables. It has the status of a group safety publication in accordance with IEC Guide 104. This second edition of IEC 60754-2 cancels and replaces the first edition, published in 1991, Amendment 1 (1997), and constitutes a technical revisio
36、n. The significant technical changes with respect to the previous edition are as follows: improved definition of safety requirements relating to capture of gases; introduction of guidance on the preparation of test specimens for more even combustion; better expression of tolerances and precision; cl
37、arification of the conductivity and acidity functions; 60754-2 IEC:2011 5 improved definition of the heating procedure; greater precision in the definition of the test temperature for the determination of pH value and conductivity; correction of the formulae for the calculation of the test results.
38、The text of this standard is based on the following documents: FDIS Report on voting 20/1265/FDIS 20/1275/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 I
39、SO/IEC Directives, Part 2. A list of all the parts in the IEC 60754 series, published under the general title Test on gases evolved during combustion of materials from cables, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until
40、 the stability date indicated on the IEC web site under “http:/webstore.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. 6 60754-2 IEC:2011 INTRODUCTION IEC 60754 consists of the followin
41、g parts, under the general title Test on gases evolved during combustion of materials from cables: Part 1: Determination of the halogen acid gas content Part 2: Determination of acidity (by pH measurement) and conductivity. IEC 60754-2 was originally developed due to concerns expressed by cable user
42、s over the amount of acid gas evolved when some cable insulating, sheathing and other materials are burned, as such corrosive effluent can cause extensive damage to electrical and electronic equipment not involved in the fire itself. NOTE Guidance on the corrosivity of fire effluent is given in IEC
43、60695-5-1. This standard provides a method for determining the acidity (by pH measurement) and conductivity of an aqueous solution of gases evolved during the combustion of materials so that limits can be agreed for cable specifications. As the test is not carried out on a complete cable test piece,
44、 for a hazard assessment the actual material volumes of the cable components should be taken into consideration. The method provides an indirect assessment of corrosivity. However, the recommended limits of pH and conductivity can only be regarded as an indication, as the relationship between corros
45、ion and these two parameters does not necessarily embrace all materials. This part of IEC 60754 is linked with IEC 60754-1, but the test procedure differs considerably. 60754-2 IEC:2011 7 TEST ON GASES EVOLVED DURING COMBUSTION OF MATERIALS FROM CABLES Part 2: Determination of acidity (by pH measure
46、ment) and conductivity 1 Scope This part of IEC 60754 specifies the apparatus and procedure for the determination of the potential corrosivity of gases evolved during the combustion of materials taken from electric or optical fibre cable constructions by measuring the acidity (pH) and conductivity o
47、f an aqueous solution resulting from the gases evolved during the combustion. The general method specified in this standard is intended for the testing of individual components used in a cable construction. Formulae are given for the calculation of a weighted value for a combination of materials fou
48、nd in a specified cable. The use of this method will enable the verification of relevant requirements for either individual components or combined components of a cable construction stated in the appropriate cable specification. A simplified method is included for the testing of individual component
49、s where it is required only to demonstrate compliance with a stated performance requirement for quality control purposes. NOTE 1 The relevant cable standard should indicate which components of the cable should be tested, and which method of calculation (see Clause 8) should be used in the case of dispute. NOTE 2 This test method may be used to test materials to be used in cable ma
