1、STD-8SI 8s EN 502b7-2-L-ENGL 1777 9 1bZLibb7 0800Li5b 9TD BRITISH STANDARD Common test methods for cables under fire conditions - Tests on gases evolved during combustion of materials from cables - Part 2-1: Procedures - Determination of the amount of halogen acid gas The European Standard EN 50267-
2、2-1: 1998 has the status of a British Standard ICs 13.220.40; 29.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGH LAW BS EN 50267-2-1: 1999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproductio
3、n or networking permitted without license from IHS-,-BS EN 50267-2-1:1999 been prepared under the direction of the Electrotechnicai Amd. No. Date Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 September 1999 O BSI 09-1999 ISBN O 680 32733 7
4、 National foreword Comments This British Standard is the English language version of EN 50267-2-1:1998. When combined with BS EN 50267-1, it supersedes BS 64251:lW which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEMO, Electric cables, to Subcommittee
5、GEy20/3, Insulation and sheath, which has the responsibility to: - aid enquirers to understand the te*, - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the
6、UK interests informed, them in the TJK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards C
7、atalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find“ faciiity of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for the
8、ir correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copyright notice displayed in this document i
9、ndicates when the document was last issued. Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50267-2-1 June
10、 1998 ICs 13.220.40; 29.060.20 Descriptors: electrical installation, electrical cables, fire tests, combustion tests, combusrion products, burning gases, corrosive gases, determination, acidity, corrosivity, testing conditions, procedure English version Common test methods for cables under fire cond
11、itions - Tests on gases evolved during combustion of materials from cables - Part 2-1: Procedures -Determination of the amount of halogen acid gas Methodes dessai communes aux cbles soumis au feu -Essais sur les gaz mis lors de la combustion dun matriau prleve sur un cble - Partie 2- I : Procedures
12、- Dtermination de la quantit de gaz acides halogens Allgemeine Prfverfahren fur das Verhalten von Kabeln und isolierten Leitungen im Brandfall - Prfung der bei der Verbrennung der Werkstoffe von Kabeln und isolierten Leitungen entstehenden Gase - Teil 2-1: Prfverfahren - Bestimmung des Gehaltes an H
13、alogenwasserstoffsure This European Standard was approved by CENELEC on 1998-04-01. CENELEC members are bound to comply with the CENICENELEC internal Regulations which stipulate the conditions for giving this European Standard the stahis of a national standard without any alteration. Up-to-date list
14、s and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the re
15、sponsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, I
16、taly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Elecrotechnical Standardization Comit Europken de Normalisation Elecrrotechnique Europisches Komitee fr Elekrotechnische Normung Central Secretariat: rue de Stassart 35, B-1
17、050 Brussels 8 1998 CENELEC - Ali rights of exploitation in any form and by any means reserved worldwide for CENELEC national members. Ref. No. EN 50267-2- 1 : 1998 E Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduc
18、tion or networking permitted without license from IHS-,-Page 2 EN 50267-2-1: 1998 Foreword This European Standard was prepared by the Technical Committee CENELEC TC20, Electric cables. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50267-2- 1
19、 on 1998-04-0 1. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1999-03-0 1 - latest date by which national standards conflicting with the EN have to be withdrawn (daw) 200
20、0-03-0 1 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this sandard annex A is informative. There is no normative annex. Contents Page Foreword 1 Scope 2 Normative references 3 Definition 4 Test apparatus 5 Pr
21、ocedure 5.1 General principle 5.2 Samples 5.3 Conditioning of the samples 5.4 Combustion of halogen acid contents 6 Determination of halogen acid content Annex A (informative) Performance requirements 2 3 3 3 3 3 3 4 4 4 4 5 Q BSI 09-1 999 Copyright European Committee for Electrotechnical Standardiz
22、ation Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-Page 3 EN 50267-2-1 : 1998 1 Scope EN 50267-2- 1 specifies the procedure for the determination of the amount of halogen acid gas, other than hydrofluoric acid, evolved dur
23、ing the combustion of compounds based on halogenated polymers, and compounds containing halogenated additives, taken from cable constructions. For reasons of accuracy this method is not recommended for use where the amount of halogen acid evolved is less than 5 mgg of the sample taken. This method i
24、s not suitable for defining compounds or materials described as “zero-halogen or “halogen-free For such compounds or materials, and all compounds or materials containing less than 5 mgg halogen acid equivalent, it is recommended to use the method specified in EN 50267-2-2. 2 Normative references Thi
25、s European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these public
26、ations apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 50267-1, Common test methods for cables underfire conditions - Tests on gases evolved during the combustion of materials
27、from cables -Part I: Apparatus. EN 60695-4, Fire hazard testing - Part 4: Terminology concerningjre test. NOTE IEC 695 is in the course of re-numbering its parts and sections. This will also affect the equivalent ENS. 3 Definition For the purposes of EN 50267-2-1 the following defuiition applies. Th
28、e definition is taken from EN 60695-4. 3.1 combustion exothermic reaction of a substance with an oxidizer with emission of effluent, generally accompanied by flames and/or glowing and/or emission of smoke 4 Test apparatus The apparatus used shall be that specified in EN 50267-1, 5 Procedure 5.1 Gene
29、ral principle The material under test is heated in a stream of dry air and the gases absorbed in O, 1 M sodium hydroxide solution contained in wash bottles. Each wash bottle shall contain at least 220 ml of O, 1 M sodium hydroxide solution. The amount of halogen acid is then determined by acidifying
30、 the solution with nitric acid adding a measured volume of O, 1 M silver nitrate solution and back titrating the excess with O, I M ammonium thiocyanate using ferric ammonium sulfate as the indicator, or any other equivalent analytical method having at least the same accuracy. Duplicate tests shall
31、be carried out on the sample of material, and a blank determination shall be carried out without the sample. Q BSI 09-1999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license
32、 from IHS-,-STDmBSI BS EN 502bf-2-L-ENGL I797 Ib24bb7 OBOOlibL 2bA Page 4 EN 50267-2-1 :1998 The result shall be taken as the mean of the two determinations. The individual values shall not vary by more than I10 % from the mean. 5.2 Samples A sample shall consist of 500 mg to 1 O00 mg of the materia
33、l to be tested. Each sample shall be taken fiom samples representative of the material. The sample shall be cut into small pieces. 5.3 Conditioning of the samples The samples shall be stored for at least 16 h at a temperature of (23 i 2) OC and a relative humidity of (50 f 5) %. 5.4 Combustion The s
34、ample, which shall be weighed after conditioning to an accuracy of 0,l mg, shall be put into a combustion boat. The sample shall be eveniy distributed on the bottom of the boat. The boat shall then be inserted into the combustion tube placed in the tube furnace. The flow rate of air shall be adjuste
35、d by means of a needle valve at (0,015 7d) bh- i 10 % and shall be kept constant during the test. The sample shall be heated at an approximately uniform heating rate over a period of (40 f 5) min in order to raise the sample temperature to (800 f 10) OC, after which it shall be maintained at that te
36、mperature for (20 f i) min. The heating rate and sample temperature shall be checked by an appropriate method. NOTE An example of a method of confirming the heating rate and sample temperature is as follows. Carry out, as a pre-test qualification procedure, a blank test with the flow rate of air as
37、specified above, with a thermocouple, or other suitable temperature measuring device (suitably protected against corrosion), placed at the sample point in the empty combustion boat. Determine from this test a reproducible heating regime which will ensure that the required sample heating rate and tem
38、perature will be achieved during an actual test. The bottles shall be disconnected, and the contents washed into a 1 O00 ml volumetric flask. Using distilled or demineralised waters, the bottles, the connecting links and end of the combustion tube (after cooling) and the silica plug, if any, shall a
39、lso be washed into the flask, and the contents made up to 1 O00 ml. After removing the combustion boat, the tube shall be cleaned throughout its length by calcination at 950 OC. 6 Determination of halogen acid content I After cooling to ambient temperature, 200 ml of the solution shall be measured i
40、nto a flask using either a pipette or burette and followed successively by 4 ml of concentrated nitric acid, 20 ml of O, 1 M silver nitrate and 3 ml of nitrobenzene”. The contents shall be well shaken to achieve agglomeration and coating of the silver halide. Hereafter, 1 ml of a 40 % aqueous soluti
41、on of femc ammonium sulfate containing a few drops of 6 M nitric acid shall be added, and the whole mixed together. The solution shall then be titrated with O, 1 M ammonium thiocyanate solution using magnetic stirring. The end-point shall be the red end-point for the titration. ” Using this method,
42、halogni acids evolved, except hydrofluoric acid, will be expressed as hydrochloric acid. 2, WARNING NOTE: Nitrobenzene is regarded as highly toxic. Toluene or so-amyl alcohol or diethyl ether are being assessed as a safer alternative. and users are invitai to comment on their suitability. 0 BSI 09-
43、I999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-Page 5 EN 50267-2-1:1998 The amount of halogen acid, expressed as milligrams of hydrochloric acid per gram
44、 of sample taken, is: 1000 36,5(B - A) M *- 200 m where A B m M is the volume of 0,l M ammonium thiocyanate solution used in the determination; is the volume of O, 1 M ammonium thiocyanate solution used in the blank test; is the mass of sample taken in grams; is the molarity of ammonium thiocyanate
45、solution. Other analytical methods may be used having at least the same accuracy. Annex A (informative) Performance requirements No requirements for conformity are included in this standard. The method specified in this standard is intended for type testing of individual components used in cable con
46、sxuction. The use of this method will enable the requirements for individual components of a cable construction to be stated in the appropriate cable specification. Q BSI 09- I999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for Resa
47、leNo reproduction or networking permitted without license from IHS-,-BS EN 50267-2-1:1999 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British EXandards. It presents the UK view on standards in Europe and
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