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1、 STD-BSI BS EN 502b7-1-ENGL L779 lb2qbb9 0775LqL 528 m BRITISH STANDARD Common test methods for cables under fire conditions - Tests on gases evolved during combustion of materials from cables - Part 1: Apparatus The European Standard EN 50267-1:1998 has the status of a British Standard ICs 13.220.4
2、0 29.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHI LAW BS EN 50267-1: 1999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- BS EN
3、 50267-k1999 National foreword been prepared under the direction of the Elecxotechnicai Sector Committee, w a s published under the authority of the Standards Committee and comes into effect on 15 September 1999 h d . NO. O BSI 09-1999 ISBN O 680 32732 9 This British Standard is the English ianguage
4、 version of EN 50267-1: 1998. When combined with BS EN 50267-2-1, it supersedes BS 64251:lW which is withdrawn. When combined with BS EN 50267-2-3, it supersedes BS 64252: 1993 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEYZO, Electric cables, to
5、 Subcommittee GELJ20/3, insuiaiion and sheath, which has the responsibility to: D a Comments - aid enquirem to understand the t e a - present to the responsible European committee any enquiries on the - monitor reiated intemational and European developments and promulgate inteqxetation, or proposals
6、 for change, and keep the UK interests informed them in the UK. A list of organizatjons represented on t h i s subcommittee can be obtained on request to its secrem. Cross-references The British Standards which implement international or European publications referred to in t h i s document may be f
7、ound in the BSI Standards Catalogue under the section entitled “Intedonal Standards Correspondence Index”, or by using the “Find” facility 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
8、are responsible for their 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 9 and a back cover. The BSI copyright notice displ
9、ayed in this document indicates when the document was last issued. Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- STD-BSI BS EN 502b7-1-ENGL 1999 lb29bb 07
10、95143 3TO = EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50267-1 June 1998 ICs 13.220.40; 29.060.20 Descriptors: Electrical installation, electric cables, fire tests, combustion tests, combustion products, Partly supersedes HD 602 S 1 : 1992 burning gases, corrosive gases, determination, aci
11、dity, corrosivity, test equipment English version Common test methods for cables under fire conditions Tests on gases evolved during combustion of materials from cables Part 1: Apparatus Mthodes dessai communes aux cbles soumis au feu -Essais sur les gaz emis lors de la combustion dun materiau prele
12、ve sur un cble Partie 1 : Appareillage dessai Allgemeine Priifverfahren fir das Verhalten von Kabeln und isolierten Leitungen im Brandfall - Prfung der bei der Verbrennung der Werkstoffe von Kabeln und isolierten Leitungen entstehenden Gase Teil 1: Prfgert This European Standard was approved by CENE
13、LEC on 1998-04-0 1. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Sudard the status of a national standard without any alteration. “-tv date lists and bibliographical references concerning such national standards
14、may be obtained on dion to the Central Secretariat or to any CENELEC member. luropean Standard exists in three official versions (English, French, German). A version in any other larsguage made by translation under the responsibility of a CENELEC member into its own language and notified to the Cent
15、ral Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland an
16、d United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fir Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels Q 1998 CENELEC All rights of exploitation in any form and by an
17、y means reserved worldwide for CENELEC members Ref. No. EN 50267-1:1998 E Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- Page 2 EN 50267-1:1998 Foreword Tu
18、s European Standard was prepared by the Technical Committee CENELEC TC20, Electric cables. When used in conjunction with EN 50267-2-3 this European Standard supersedes HD 602 S 1 : 1992. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50267-1
19、on 1998-04-01. The following dates were fuced: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dp) 1999-03-01 - latest date by which national standards conflicting with the EN have to be withdrawn (dow) 2000-03
20、-0 1 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definition 3 4 Test apparatus 3 4.1 General 3 4.2 Tube h a c e 3 4.3 Tube 3 4.4 Combustion boats 3 4.5 Bubbling devices for gases 4 4.6 Air supply system 4 O BSI 09- I999 Copyright European Committee for Electrotechnical Standardizat
21、ion Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- STD-BSI BS EN 502b7-L-ENGL 3999 9 lb24bb9 0775345 173 Page 3 EN 50267-11998 1 Scope EN 50267-1 specifies apparatus suitable for use with procedures for the quantitative d
22、etermination of gases, especially acidic and corrosive gases, evolved when non-metallic materials taken from cables are subject to combustion. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are
23、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 publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edi
24、tion of the publication referred to applies. EN 60695-4, Fire hazard testing - Part 4: Terminology concerningjre tests. NOTE IEC 60695 is in the CWISC of re-nurnbning its parts and sections. This will also affect the equivalent ENS. 3 Definition For the purposes of EN 50267-1 the following definitio
25、n applies. The defmition 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 4.1 General The principle diagrams of the apparatus are shown in F
26、igures i to 5. The assembly of the components which constitute the test apparatus shall be leak-tight, The connecting distances between the tube and the first wash bottle and between the first and the second wash bottle shall be as short as possible. Glass or silicone rubber tubing shall be used for
27、 these connections. NOTE At the exit side of the tube. as close to the end as possible, it is permitted to place a plug of silica wool (typically weighing about 3 g) to aid collection of condensates. 4.2 Tube furnace The effective length of the heating zone of the furnace shall be 500 mm to 600 mm a
28、nd its inside diameter 40 mm to 60 mm. It shall be equipped with an electrically adjusted heating system. 4.3 Tube The furnace contains a fireproof tube made of silica resistant to the action of corrosive gases. The tube shall be approximately concentric to the tube furnace. The inside diameter of t
29、he silica tube shall be within the limits of 32 mm to 45 mm. The tube protrudes on the entrance side of the h a c e by a length of 60 mm to 200 mm, and on the exit side by 60 mm to 100 mm. The initial clearance should allow for thermal expansion. 4.4 Combustion boats These are recommended to be eith
30、er porcelain, fused quartz or soapstone and should have the following dimensions: -45mmto 100mmlong; - 12 mm to 30 mm wide; - 5 mm to 10 mm deep. O BSI 09-1999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction o
31、r networking permitted without license from IHS -,- Page 4 EN 50267-1:1998 A preferred method for insertion of the combustion boats into the tube is shown in Figure 1. Each boat should only be used three times before firing or renewing. 4.5 Bubbling devices for gases At the exit of the tube, the gas
32、es pass through two wash bottles as described in the relevant section of Part 2. (An example of a wash bottle is shown in Figure 2.) A magnetic stirrer shall be introduced in the fmt bottle to get a good swirling motion and a better absorption of the combustion gases. The tubes into the wash bottles
33、 shall have a maximum internal diameter at their tip of 5 mm, also to aid better absorption. The height of the liquid above the end of the tube shall be 100 mm to 120 mm in each bottle. 4.6 Air supply system The gas used for combustion shall be air. The flow rate of air introduced into the tube shal
34、l be adjusted according to the aclal internal cross-sectional area of the tube, such that the speed of air flowing across the sample is 20 ml.mm-*.h - . Because the speed of air cannot be directly Teasured it shall be regulated by reference to the flow rate of air. The flow rate of air shall be (0,O
35、 15 703 1.h- f 10 %. NOTE The derivation of the required flow rate of air to give the specified speed of air is: where D p Y is the internai diameter of $e tube (mrn); is the flow rate in air (mi+ is the speed of air (mi.mm*”i-). Because a tolerance off 1 O % is specified for the flow rate of air th
36、is also applies to V. The air supply, which shall be derived from a high purity source, shall be adjusted and controlled by a needle valve, and the flow rate monitored by a flowmeter of the appropriate range. Method 1 U s e of synthetic air (compressed air in bottle as delivered). Air is introduced
37、on the inlet side of the combustion tube. (See Figure 3.) Method 2 Use of compressed air supplied in the laboratory. Air is introduced on the inlet side of the combustion tube and should be filtered. (See Figure 4.) Method 3” U s e the ambient air of the laboratory, after having filtered it suitably
38、. In that case, the mixture of air and combustion gas is sucked by a pump. (See Figure 5.) ) The operator should take precautions. i.e. the wearing of eye protection and suitable protective clothing. because certain materiais ignite quickly, and can cause Wow-back” of hot gases. Care should also be
39、taken to avoid over-pressurization of the system, and to allow for venting of exhaust gases. 6 BSI 09- I999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,-
40、Page 5 EN 50267-1:1998 I J O BSI 09-1 999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- Page 6 EN 50267-1 : 1998 e- : . -. - - . - 8 . - -E I I 1 I I i i
41、I I i l l : Stwirr Figure 2 - Example of a gas washing bottle e - - e . . 9- T 8 O U O L E E z O 2. 8 BSI 09- I999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from I
42、HS -,- STD-BSI BS EN 502b7-3-ENGL 3999 = Lb24bbS 0795349 Al9 Page 7 EN 50267-1 :1998 9 BSI 09- 1999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- STD.BSI
43、BS EN 502b7-L-ENGL 1999 Lb2ribb 0795L50 530 Page 8 EN 50267-1 : 1998 - a? O if L CA U u P & E! u i ! I E v) i r O (Y a O 5 P e c , CA a a CA c, 8 I d 1 om 2 iz O BSI 09-1999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo
44、reproduction or networking permitted without license from IHS -,- STD-BSI BS EN 50267-L-ENGL 1777 D 1b24bb7 0775151 477 Page 9 EN 50267-1 : 1998 8 f -2 Y # 1c o f O 0 BSI 09- 1999 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Res
45、aleNo reproduction or networking permitted without license from IHS -,- BS EN 50267-k1999 BSI 389 Chiswick High Road London w 4 4AL STD*BSI BS EN 502b7-3-ENGL L777 W 3btibbS 0775352 303 W BSI - British Standards Institution BSI is the independent national body responsible for preparing British stcui
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