1、BRITISH STANDARD BS EN 50289-4-12: 2004 Communication cables Specifications for test methods Part 4-12: Environmental test methods Vertical flame spread test on bunched small communication cables The European Standard EN 50289-4-12:2004 has the status of a British Standard ICS 13.220.40; 33.120.10 B
2、S EN 50289-4-12:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 14 July 2004 BSI 14 July 2004 ISBN 0 580 44066 4 National foreword This British Standard is the official English language version of EN 50289-4-12:2004. The UK participation
3、 in its preparation was entrusted to Technical Committee EPL/46, Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cros
4、s-references The British Standards which implement international or European 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 “Search” facility of the BSI Electronic Catalogue or of
5、British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; pr
6、esent to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front
7、 cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50289-4-12 NORME EUROPENNE EUROPISCHE NORM June 2004 CENELEC Europ
8、ean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for
9、 CENELEC members. Ref. No. EN 50289-4-12:2004 E ICS 13.220.40; 33.120.10 English version Communication cables Specifications for test methods Part 4-12: Environmental test methods Vertical flame spread test on bunched small communication cables Cbles de communication Spcifications des mthodes dessai
10、 Partie 4-12: Mthodes dessais denvironnement Essai de propagation verticale de la flamme pour petits cbles de communication en faisceaux Kommunikationskabel Spezifikationen fr Prfverfahren Teil 4-12: Umweltprfverfahren Prfung der vertikalen Ausbreitung von Flammen auf dnne Kommunikationskabelbndel T
11、his European Standard was approved by CENELEC on 2004-02-01. 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-to-date lists and bibliographical r
12、eferences 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 responsibility of a CENEL
13、EC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irelan
14、d, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 50289-4-12:2004 - 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 46X, Communication cables. The text of
15、 the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50289-4-12 on 2004-02-01. 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) 2005-02
16、-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-02-01 _ - 3 - EN 50289-4-12:2004 Contents 1 Scope. 4 2 Normative references. 4 3 Definitions. 4 4 Test apparatus. 4 5 Test procedure. 5 6 Evaluation of the test results 6 7 Performance requirement
17、s. 6 8 Procedure for cross-checking 6 9 Test report 7 EN 50289-4-12:2004 - 4 - 1 Scope This part 4-12 of EN 50289 concerns small communication cables with a diameter equal or less than 14 mm, mounted on a test scale in bundles in order to obtain a total normal volume of non-metallic material equal t
18、o 0,5 l/m of test sample. The application time is 20 min. The tests proposed are for communication cables that require the testing of cables for low density installation. The tests must be stipulated in the cable specifications, where the requirements must also be given. 2 Normative references The f
19、ollowing 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. EN 50266-1 Common test methods for cables under fire c
20、onditions - Test for vertical flame spread of vertically-mounted bunched wires or cables Part 1: Apparatus EN 60695-4 Fire hazard testing - Part 4: Terminology concerning fire tests (IEC 60695-4) EN 60811-1-3 Insulating and sheathing materials of electric and optical cables Common test methods Part
21、1-3: General application - Methods for determining the density - Water absorption tests - Shrinkage test (IEC 60811-1-3) 3 Definitions For the purpose of the present EN 50289-4-12, the following definitions apply. These definitions are taken from EN 60695-4. 3.1 source of ignition source of energy t
22、riggering combustion 3.2 charred residue carbon residue, resulting from pyrolisis or from incomplete combustion 3.3 flame spread spreading of a flame front 4 Test apparatus 4.1 General information The apparatus specified in EN 50266-1 must be used. 4.2 Source of ignition The source of ignition shoul
23、d comprise a propane ribbon burner as specified in EN 50266-1. - 5 - EN 50289-4-12:2004 5 Test procedure 5.1 Test sample The sample must include a certain number of cable sections from the same production run, each with a minimum length of 2,5 m and assembled in bundles of approximately 30 mm, as in
24、dicated in 5.2. The total number of cable sections making up the test sample must be equal to the number stipulated so as to provide a nominal total volume of non-metallic material equal to 0,5 l per metre of test sample falling between 0,4 l/m and 0,6 l/m. The test sample has to be chosen within th
25、e limits given in 5.3. The cable sections making up the test sample must be conditioned at a temperature of (20 + 10) C for at least 16 h before beginning the test. The cable sections must be dry. 5.2 Determining the number of cable sections In order to calculate the appropriate number of cable sect
26、ions, the volume per metre of non-metallic material in a cable section must be determined. A length of cable, which should not be less than 0,3 m, is carefully cut so that the cut surfaces are perpendicular to the cables axis, thus making it possible to measure its length accurately. The density of
27、each non-metallic component (including cellular material) must be measured using an appropriate method, for example in compliance with Clause 8 of EN 60811-1-3, in order to give values expressed to two decimal places. All Ci non-metallic material must be withdrawn from the sample and weighed. All no
28、n-metallic material counting for less than 5 % of the total non-metallic mass of the cable section should be considered as having a density of 1,0 kg/dm. Where the semi-conductor shields cannot be separated from the insulation materials, they may be considered as being part of the insulating materia
29、l when measuring their mass and density. The volume V i(in litres per metre of cable) of each Ci non-metallic component can be measured or calculated as follows: V i = where M iis the mass of the Ci component (kg) P iis the density of the Ci component (kg/dm) L is the length of the cable sample (m)
30、The total volume, V, of non-metallic material contained in a metre of cable is equal to the sum of the individual volumes V 1 , V 2 , etc. 5.3 Installation for test a) the diameter of the bundles is approximately 30 mm b) the space between the bundles will be approximately 15 mm M i _ P i L EN 50289
31、-4-12:2004 - 6 - c) the number of cables per bundle should be based on a circular geometric construction, for example 7-19-37etc. However possible number of cables per bundle are 3,7,12,19,27,37,61,91,127,169. d) the number of bundles will be determined as follows: i) the number of bundles must be a
32、s small as possible with a minimum of two; ii) each bundle should have the same construction; iii) the number of bundles must be determined if it is necessary to give a value of approximately 0,5 l/m object of (ii) above to the total volume of non-metallic material. The cable to be tested must be se
33、lected so that the total of the non-metallic material in the bundles to be tested is over 0,4 l/m but does not exceed 0,6 l/m; iv) the length of the bundles must be 3,5 m; e) the bundle shall be tightly twisted with a lay length of approximately 15 time of the bundle diameter. 5.4 Length of time the
34、 flame should be applied The test flame should be applied for 20 min, after which it will be extinguished. The airflow through the test chamber must be maintained until combustion or incandescence of the cable is over, or for a maximum time of one hour, after which any remaining combustion or incand
35、escence of the cable must be extinguished. 6 Evaluation of the test results Once combustion or incandescence of the cable is over or has been extinguished, the test sample must be wiped. The results are not taken into account if, after wiping, the original surface has not been damaged. The melted or
36、 distorted parts of the non-metallic material are not taken into account either. The spreading of the flame must be measured to two decimal places, from the lower end of the burner up to the limit of the charred zone. This is defined as follows: Using a sharp object, for example a knife blade, apply
37、 pressure to the surface of the cable. The limit of the charred zone is found at the point where the behaviour of the surface becomes brittle (crumbly) instead of elastic. 7 Performance requirements The performance requirements for a particular type or a particular class of wire or cable should be g
38、iven in that cables individual standard. If no given requirement exists, it is considered that the maximum limit burnt is 2,50 m. 8 Procedure for cross-checking In the event of conflict, two further tests as specified in Clause 5 must be carried out. The test is considered as satisfactory if the two
39、 tests meet the given requirements. - 7 - EN 50289-4-12:2004 9 Test report The test report must include the following information: a) the complete description of the cable tested; b) the manufacturer of the cable tested; c) the section of the standard in compliance with which the test is carried out
40、; d) the number of cable sections; e) the total volume of non-metallic material per metre of test sample in the cable sections; f) the number of bundles; g) the length of time the flame is applied (i.e. 20 min); h) the number of burners (i.e. 1); i) the extent of the damaged part; j) the length of t
41、ime before any combustion or incandescence is extinguished. BS EN 50289-4-12: 2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the in
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