1、BRITISH STANDARD BS EN 50289-3-10: 2004 Communication cables Specifications for tests methods Part 3-10: Mechanical test methods Torsion and twisting The European Standard EN 50289-3-10:2004 has the status of a British Standard ICS 33.120.10 BS EN 50289-3-10:2004 This British Standard was published
2、under the authority of the Standards Policy and Strategy Committee on 12 January 2005 BSI 12 January 2005 ISBN 0 580 45231 X National foreword This British Standard is the official English language version of EN 50289-3-10:2004:2004. The UK participation in its preparation was entrusted by Technical
3、 Committee EPL/46, Cables, wires and waveguides, R.F. connectors and accessories for communication and signalling, to Subcommittee EPL/46/1, Communication cables, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cr
4、oss-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 o
5、f 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;
6、present to the responsible international/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,
7、 an inside front cover, the EN title page, pages 2 to 9 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 50289-3-10 NORME EUROPENNE EUROPISCHE NORM Decembe
8、r 2004 CENELEC European 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 re
9、served worldwide for CENELEC members. Ref. No. EN 50289-3-10:2004 E ICS 33.120.10 English version Communication cables Specifications for tests methods Part 3-10: Mechanical test methods Torsion and twisting Cbles de communication Spcifications pour les mthodes dessais Partie 3-10: Mthodes dessais m
10、caniques Torsion et vrillage Kommunikationskabel Spezifikationen fr Prfverfahren Teil 3-10: Mechanishe Prfverfahren - Torsion und Verdrillung This European Standard was approved by CENELEC on 2004-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate th
11、e conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exist
12、s in three official versions (English, French, German). A version in any other language made by translation under the responsibility 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 electr
13、otechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN
14、50289-3-10:2005 - 2 - Foreword This European Standard was prepared by CENELEC Technical Committee TC 46X, Communication cables. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50289-3-10 on 2004-11-01. The following dates were fixed: latest da
15、te by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2005-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-11-01 This European Standard has been prepared under the
16、European Mandate M/212 given to CENELEC by the European Commission and the European Free Trade Association. _ - 3 - EN 50289-3-10:2004 Contents 1 Scope.4 2 Normative references.4 3 Definitions.4 4 Torsion 4 4.1 Sample4 4.2 Equipment.4 4.3 Procedure5 4.4 Requirements .6 4.5 Test report.6 5 Twisting.8
17、 5.1 Procedure 1.8 5.2 Procedure 2.8 5.3 Requirements .9 5.4 Test report.9 EN 50289-3-10:2005 - 4 - 1 Scope This Part 3-10 of EN 50289 details the method of test to determine the ability of a finished cable used in analogue and digital communication systems to withstand mechanical twisting and torsi
18、on. The primary purpose of the torsion test is to measure any variation in optical power transmittance of a fibre or electrical performance of a copper cable when the cable is subjected to torsional and twisting forces external to the cable jacket. A secondary purpose is to evaluate the possibility
19、of physical damage that may occur as a result of such stresses. The primary purpose of the twisting test is to determine the change of RL and NEXT caused when the cable assembly is subjected either to bending or twisting. It is to be read in conjunction with EN 50289-3-1, which contains essential pr
20、ovisions for its application. 2 Normative 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) appli
21、es. EN 50289-3-1 2001 Communication cables - Specifications for test methods Part 1-1: Mechanical test methods General requirements EN 50290-1-2 2004 Communication cables - Part 1-2: Definitions 3 Definitions For the purposes of this European Standard the definitions of EN 50290-1-2 apply. 4 Torsion
22、 4.1 Sample The specimen shall be a sample of finished cable having a total length sufficient to permit the appropriate clamping and torsion, and long enough to permit optical transmittance or electrical measurements as required by the relevant cable specification. 4.2 Equipment The torsional appara
23、tus consists essentially of two cable gripping devices or clamps, one fixed and one that can rotate, supported as appropriate, and adjustable as to distance between them. The rotating clamp is connected to suitable turning equipment (e.g. a torquing lever). Any clamp supports, gripping devices, or t
24、orquing equipment used shall all be such as to permit access to both ends of the cable specimen for optical or electrical testing as may be required. Suitable apparatus is illustrated in Figures 1, 2 and 3. - 5 - EN 50289-3-10:2004 The cable gripping devices shall be such that - they may be tightene
25、d around the cable sufficiently to prevent movement within the grip, - the clamps hold the cable firmly in a straight line, - the clamps induce neither localized twisting damage on the cable caused by the inside edge of the clamp nor undue localized concentration of pressure on the cable, - the proc
26、ess of clamping does not induce any significant or accurately measurable attenuation increase (or no more than a negligible increase) in the specimen. If required by the relevant cable specification and/or to minimize specimen bending from a straight configuration, use weights or an appropriate load
27、ing mechanism to apply a tensile load to the cable gripping fixture (see Figures 1 and 3). The apparatus shall include test equipment to measure the change in optical or electrical performance as required in the relevant specification. 4.3 Procedure Install the specimen in the test apparatus such th
28、at the test length, L (see Figures 1, 2 and 3), is as required by the relevant cable specification. Take care to insure that no initial stress is applied to the specimen. Except for the necessary twisting operation, take care not to move or disturb the specimen ends throughout the test. Minimize spe
29、cimen sag (Figure 1 or 2) or vertical deviation from a straight line (Figure 3) as much as possible. If optical or electrical tests are required by the relevant cable specification, measure the unstressed specimen. Compare results with those after clamping to ensure that the clamping has not signifi
30、cantly degraded the cable performance. If not prohibited by the relevant cable specification, specimen sag or bend may be minimized by supporting the test length or by applying tension to the specimen cable between clamps. If required, apply tension as specified in the relevant cable specification t
31、o keep the specimen straight. If tension is required by the relevant cable specification, but specific tension loads are not stated, apply tension as shown in Table 1. Table 1 - Tension to be applied Nominal cable diameter range mm Minimum load N 2,5 15 2,6 to 4,0 25 4,1 to 6,0 40 6,1 to 9,0 45 9,1
32、to 13,0 50 13,1 to 18,0 55 18,1 to 24,0 65 24,1 to 30,0 70 30,1 75 If optical or electrical tests are required by the relevant cable specification, perform the required tests after clamping and application of tensile load. EN 50289-3-10:2005 - 6 - Rotate the movable cable clamp as follows: - rotate
33、180 clockwise; - return to the starting position; - rotate 180 counter-clockwise; - return to the starting position. This total four-part movement constitutes one cycle. Unless otherwise specified in the relevant cable specification, complete each cycle within 1 min, maximum, for a total of 10 cycle
34、s. During the final cycle (tenth), determine the number of transmitting fibres with the cable: - rotated 180 clockwise; - rotated 180 counter-clockwise; - with no rotation, after completion of the final cycle. Carry out the specified measurements. Allow the specimen to rest for a minimum period of 5
35、 min. If necessary, the sample may be removed from the apparatus for visual examination using normal corrected vision. 4.4 Requirements The acceptance criteria for the sample under test shall be stated in the relevant cable specification. Typical failure modes include loss of optical continuity, inc
36、rease in fibre loss, degradation of return loss, degradation of NEXT, and damage to the cable jacket or core components. 4.5 Test report The test report shall give the test conditions: - test length, L; - any tension which is to be applied; - number of fibres to be monitored for optical transmittanc
37、e; - maximum allowable change in optical or electrical performance; - temperature and record the pass/fail conditions as required in the relevant cable specification. L Sample Fixed cable clamp Rotating cable clamp Figure 1 - Cable torsion apparatus - 7 - EN 50289-3-10:2004 L Sample Fixed cable clam
38、p Rotating cable clamp Weight Figure 2 - Cable torsion apparatus with tension applied L Fixed clamp Sample Rotating clamp Weight Figure 3 - Alternative cable torsion apparatus with tension applied EN 50289-3-10:2005 - 8 - 5 Twisting 5.1 Procedure 1 A cable assembly which is in “U“ shape has to be co
39、nnected to a suitable network analyser (Figure 4a). During recording of the RL or the NEXT, the cable is wound around the mandrel for 180 (Figure 4b), unwound to the starting position, wound counter-clockwise for 180 around the mandrel (Figure 4c) and again unwound to its starting position. The init
40、ial position of the mandrel shall be chosen that only the straight parts of the “U“ will be bent during the test. Unless otherwise specified the radius of mandrel shall be 120 mm. Key DUT = device under test NWA = network analyser Figure 4 - Bending test: assembly in U shape 5.2 Procedure 2 A cable
41、assembly which is in “U“ shape has to be connected to a suitable network analyser (Figure 5a). During the recording of the RL and the NEXT the mandrel in the middle of the cable is first twisted in a clockwise direction for 180 (Figure 5b) then released to the starting position, twisted counter-cloc
42、kwise for 180 (Figure 5c) and again released to its starting position. NOTE Depending on the torsional rigidity and the maximum permissible torque at the cable connectors interface the maximum twist angle may have to be restricted. Unless otherwise specified the radius of mandrel shall be 120 mm. -
43、9 - EN 50289-3-10:2004 Key DUT = device under test NWA = network analyser Figure 5 Twisting test: assembly in U shape 5.3 Requirements The RL and NEXT shall not exceed the limits specified in the relevant relevant cable specification. 5.4 Test report The test report shall give the test conditions: -
44、 sample length, L; - radius of the mandrel; - number of fibres to be monitored for optical transmittance; - maximum allowable change in optical or electrical performance; - temperature and record the pass/fail conditions as required in the relevant cable specification. _ BS EN 50289-3-10: 2004 BSI 3
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