EN 60754-2-2014 en Test on gases evolved during combustion of materials from cables - Part 2 Determination of acidity (by pH measurement) and conductivity.pdf

1、BSI Standards PublicationTest on gases evolved during combustion of materials from cablesPart 2: Determination of acidity (by pH measurement) and conductivityBS EN 60754-2:2014National forewordThis British Standard is the UK implementation of EN 60754-2:2014. It is identical to IEC 60754-2:2011. Tog

2、ether with BS EN 60754-1:2014 it supersedes BS EN 50267-1:1999, BS EN 50267-2-1:1999, BS EN 50267-2- 2:1999 and BS EN 50267-2-3:1999 which will be withdrawn on 27 January2017.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/20, Electric cables, to Subcommittee GEL/20/1

3、8, ElectricCables Fire testing.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution

4、 2014Published by BSI Standards Limited 2014ISBN 978 0 580 62724 8ICS 13.220.40; 29.020; 29.060.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2014.Amend

5、ments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60754-2:2014EUROPEAN STANDARD EN 60754-2 NORME EUROPENNE EUROPISCHE NORM April 2014 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr El

6、ektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60754-2:2014 E ICS 13.220.40; 29.020; 29.060.20 Supersedes EN 50267-1:1998 (partially)

7、, EN 50267-2-1:1998 (partially), EN 50267-2-2:1998 (partially), EN 50267-2-3:1998 (partially) English version Test on gases evolved during combustion of materials from cables - Part 2: Determination of acidity (by pH measurement) and conductivity (IEC 60754-2:2011) Essai sur les gaz mis lors de la c

8、ombustion des matriaux prlevs sur cbles - Partie 2: Dtermination de la conductivit et de lacidit (par mesure du pH) (CEI 60754-2:2011) Prfung der bei der Verbrennung der Werkstoffe von Kabeln und isolierten Leitungen entstehenden Gase - Teil 2: Bestimmung der Aziditt (durch Messung des pH-Wertes) un

9、d Leitfhigkeit (IEC 60754-2:2011) This European Standard was approved by CENELEC on 2014-01-27. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-

10、to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by tr

11、anslation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic

12、, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS E

13、N 60754-2:2014EN 60754-2:2014 - 2 - Foreword This document (EN 60754-2:2014) consists of the text of IEC 60754-2:2011, prepared by IEC/TC 20 “Electric cables“. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical nati

14、onal standard or by endorsement (dop) 2015-01-27 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-01-27 This document supersedes EN 50267-1:1998 (PART), EN 50267-2-1:1998 (PART), EN 50267-2-2:1998 (PART), EN 50267-2-3:1998 (PART). Attention is

15、 drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Desi

16、gned for Use within Certain Voltage Limits (LVD - 2006/95/EC). Endorsement notice The text of the International Standard IEC 60754-2:2011 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the sta

17、ndard indicated : IEC 60695-5-1 NOTE Harmonized as EN 60695-5-1. BS EN 60754-2:2014- 3 - EN 60754-2:2014 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in

18、this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, i

19、ndicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year ISO 1042 - Laboratory glassware - One-mark volumetric flasks EN ISO 1042 - ISO 3696 - Water for analytical laboratory use - Specification and test methods EN ISO 3696 - BS EN 60754-2:2014 2 60754-2 IEC:2011 CONTENTS INT

20、RODUCTION . 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 devices for gases 9 5.6 Air supply system 9 5.7 Analytical balance . 10

21、 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 apparatus and arrangement . 11 7.3 Heating procedure . 11 7.4 Washing pro

22、cedure . 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 Performance requirement . 13 10 Test report 13 Annex A (informative) Recomme

23、nded 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 a bottle 16 Figure 4 Test apparatus: method 2 Use of laboratory co

24、mpressed air supply 17 BS EN 60754-2:201460754-2 IEC:2011 3 Figure 5 Test apparatus: method 3 Use of ambient air sucked by means of a suction pump 18 BS EN 60754-2:2014 6 60754-2 IEC:2011 INTRODUCTION IEC 60754 consists of the following parts, under the general title Test on gases evolved during com

25、bustion 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 users over the amount of acid gas evolved when some cable insulating,

26、 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 60695-5-1. This standard provides a method for determining the ac

27、idity (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, for a hazard assessment the actual material volumes of the cable

28、 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 corrosion and these two parameters does not necessarily embrace all mat

29、erials. This part of IEC 60754 is linked with IEC 60754-1, but the test procedure differs considerably. BS EN 60754-2:201460754-2 IEC:2011 7 TEST ON GASES EVOLVED DURING COMBUSTION OF MATERIALS FROM CABLES Part 2: Determination of acidity (by pH measurement) and conductivity 1 Scope This part of IEC

30、 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 of an aqueous solution resulting from the gases

31、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 found in a specified cable. The use of this method

32、 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 components where it is required only to demonstrate comp

33、liance 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 t

34、est materials to be used in cable manufacture, but a declaration of cable performance should not be made based on such a test. NOTE 3 For the purposes of this standard, the term “electric cable” covers all insulated metallic conductor cables used for the conveyance of energy or signals. 2 Normative

35、references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1042, Laboratory glassware One-mar

36、k volumetric flasks (available only in French) ISO 3696, Water for analytical laboratory use Specification and test methods 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 pH value pH of an aqueous solution resulting from the gases evolved du

37、ring the combustion of the material under the conditions given in this standard BS EN 60754-2:2014 8 60754-2 IEC:2011 3.2 conductivity value conductivity of an aqueous solution resulting from the gases evolved during the combustion of the material under the conditions given in this standard 4 Test m

38、ethod principle The material under test shall be heated in a stream of dry air. The evolved gases shall be trapped by bubbling through wash bottles filled with distilled or demineralized water. The acidity of the resulting solution shall be assessed by determination of its pH value. The conductivity

39、 of the solution shall also be determined. 5 Test apparatus 5.1 General The apparatus is shown in Figures 1 to 5. The assembly of the components which constitute the test apparatus shall be leak-tight. The connecting distances between the quartz glass tube and the first bottle and between subsequent

40、 bottles shall be as short as possible. Glass or silicone rubber tubing shall be used for these connections. NOTE 1 At the exit side of the quartz glass tube, as close to the end as possible, it is permitted to place a plug of silica wool to aid collection of condensates. NOTE 2 A third empty bottle

41、, of the same size as the gas washing bottles, placed before the gas washing bottles may be used to improve safety, i.e. to prevent suck back of water into the quartz glass tube. 5.2 Tube furnace The length of the heating zone of the furnace shall be within the range 480 mm to 620 mm and its inside

42、diameter shall be within the range 38 mm to 62 mm. It shall be equipped with an adjustable electrical heating system. 5.3 Quartz glass tube For the test, a quartz glass tube shall be introduced into the tube furnace. The tube shall be approximately concentric to the furnace. It shall be resistant to

43、 the action of corrosive gases. The inside diameter of the tube shall be within the range 30 mm to 46 mm. The tube shall protrude on the entrance side of the furnace by a length of between 60 mm to 200 mm, and on the exit side by between 60 mm to 100 mm. The initial clearance shall allow for thermal

44、 expansion. For the purposes of measurement of the protrusion distances, the tube shall be regarded as that part of essentially constant diameter. NOTE The outer diameter of the tube should be chosen with due regard to the inside diameter of the tube furnace. Prior to each test the tube shall be cle

45、aned throughout its length by being calcined at approximately 950 C. 5.4 Combustion boats The combustion boat shall be made of porcelain, fused quartz or soapstone and shall have the following dimensions: external length: within the range 45 mm to 100 mm; BS EN 60754-2:201460754-2 IEC:2011 9 externa

46、l width: within the range 12 mm to 30 mm; internal depth: within the range 5 mm to 10 mm. NOTE The dimensions of the boat should be chosen with due regard to the inside diameter of the quartz tube. The preferred method for insertion of the combustion boat into the quartz glass tube is shown in Figur

47、e 1. Prior to each test, the combustion boat shall be washed and calcined in a muffle furnace at approximately 950 C for 4 h after which it shall be introduced into a desiccator and cooled to ambient temperature. The combustion boat shall then be weighed to an accuracy of 0,1 mg until two identical

48、consecutive weights are obtained. This weight m1shall be recorded. 5.5 Bubbling devices for gases At the exit of the quartz glass tube, the evolved gases shall be trapped by bubbling through two wash bottles (see Figure 2), each containing approximately 450 ml of distilled or demineralized water of

49、a purity at least Grade 3 in accordance with ISO 3696. The pH value of the water shall be between 5,5 and 7,5, and the conductivity less than 0,5 S/mm. A magnetic stirrer shall be introduced in the first gas washing bottle to get a good swirling motion and an effective absorbtion of the combustion gases. The tubes into the wash bottles shall have a maximum internal diameter at their tip of 5 mm in order to aid absorption. The height of the liquid above the end of the tube shall be (110 1