Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex and duplex cables for use in terminated cable assemblies

Lichtwellenleiterkabel - Teil 2-50: LWL-Innenkabel - Familienspezifikation für Simplex- und Duplexkabel für den Einsatz in konfektionierten Kabeln

Câbles à fibres optiques - Partie 2-50: Câbles intérieurs - Spécification de famille pour les câbles simplex et duplex utilisés dans les câbles assemblés équipés

Optični kabli - 2-50. del: Notranji kabli - Skupinska specifikacija za simpleksne in dupleksne kable za zaključene kabelske sestave (IEC 60794-2-50:2023)

General Information

Status
Published
Publication Date
11-May-2023
Current Stage
6060 - Document made available - Publishing
Start Date
12-May-2023
Due Date
21-Jun-2024
Completion Date
12-May-2023

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SLOVENSKI STANDARD
oSIST prEN IEC 60794-2-50:2022
01-september-2022
Optični kabli - 2-50. del: Notranji optični kabli - Skupinska specifikacija za
simpleksne in dupleksne kable za zaključene kabelske sestave

Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex and

duplex cables for use in terminated cable assemblies

Lichtwellenleiterkabel - Teil 2-50: LWL-Innenkabel - Familienspezifikation für Simplex-

und Duplexkabel für den Einsatz in konfektionierten Kabeln

Câbles à fibres optiques - Partie 2-50: Câbles intérieurs - Spécification de famille pour

les câbles simplex et duplex utilisés dans les câbles assemblés équipés
Ta slovenski standard je istoveten z: prEN IEC 60794-2-50:2022
ICS:
33.180.10 (Optična) vlakna in kabli Fibres and cables
oSIST prEN IEC 60794-2-50:2022 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 60794-2-50:2022
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oSIST prEN IEC 60794-2-50:2022
86A/2202/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60794-2-50 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-06-10 2022-09-02
SUPERSEDES DOCUMENTS:
86A/2165/CD, 86A/2196/CC
IEC SC 86A : FIBRES AND CABLES
SECRETARIAT: SECRETARY:
France Mr Laurent Gasca
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
SC 86B
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY

SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference purposes.

Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of

which they are aware and to provide supporting documentation.
TITLE:

Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex and duplex

cables for use in terminated cable assemblies
PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:

Copyright © 2022 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.

You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without

permission in writing from IEC.
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oSIST prEN IEC 60794-2-50:2022
IEC CDV 60794-2-50/Ed3 © IEC 2022 – 2 – 86A/2202/CDV
1 CONTENTS

2 CONTENTS ............................................................................................................................ 2

3 FOREWORD ........................................................................................................................... 4

4 1 Scope .............................................................................................................................. 6

5 2 Normative references ...................................................................................................... 6

6 3 Terms and definitions ...................................................................................................... 7

7 4 Construction .................................................................................................................... 7

8 4.1 General ................................................................................................................... 7

9 4.2 Optical fibres and primary coating ........................................................................... 7

10 4.3 Buffer ...................................................................................................................... 8

11 4.4 Tube ....................................................................................................................... 8

12 4.5 Strength and anti-buckling members ....................................................................... 8

13 4.6 Sheath .................................................................................................................... 8

14 4.7 Sheath marking ....................................................................................................... 8

15 4.8 Examples of cable constructions ............................................................................. 9

16 5 Tests ............................................................................................................................... 9

17 5.1 General ................................................................................................................... 9

18 5.2 Dimensions ............................................................................................................. 9

19 5.3 Mechanical requirements ...................................................................................... 10

20 5.3.1 Tensile performance ...................................................................................... 10

21 5.3.2 Crush ............................................................................................................ 10

22 5.3.3 Impact ........................................................................................................... 11

23 5.3.4 Repeated bending ......................................................................................... 11

24 5.3.5 Bend .............................................................................................................. 12

25 5.3.6 Torsion .......................................................................................................... 12

26 5.3.7 Bend at low temperature ................................................................................ 13

27 5.3.8 Kink ............................................................................................................... 13

28 5.3.9 Sheath pull-off force ...................................................................................... 13

29 5.3.10 Abrasion resistance of cable marking ............................................................ 13

30 5.3.11 Buffered fibre movement under compression ................................................. 14

31 5.4 Environmental requirements ................................................................................. 14

32 5.4.1 Temperature cycling ...................................................................................... 14

33 5.4.2 Sheath shrinkage ........................................................................................... 15

34 6 Transmission requirements ............................................................................................ 15

35 7 Fire performance ........................................................................................................... 15

36 Annex A (informative) Examples of cable constructions ...................................................... 16

37 Annex B (informative) Guidance on the selection of tests applicable to optical fibre

38 cables for use in terminated cable assemblies ............................................................... 19

39 Bibliography .......................................................................................................................... 22

41 Figure A.1 – Simplex non-buffered cable .............................................................................. 16

42 Figure A.2 – Simplex cable ................................................................................................... 16

43 Figure A.3 – Duplex non-buffered cable ................................................................................ 16

44 Figure A.4 – Duplex cable ..................................................................................................... 17

45 Figure A.5 – Duplex zip cord cable ....................................................................................... 17

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46 Figure A.6 – Duplex flat cable ............................................................................................... 17

47 Figure A.7 – Duplex round cable (breakout cable) ................................................................. 18

49 Table 1 – Outer dimensions of buffered fibres ......................................................................... 8

50 Table 2 – Preferred low and high temperatures ..................................................................... 14

51 Table B.1 – Cable test method summary ............................................................................... 19

52 Table B.2 – Blank detail specification for cable testing agreement ........................................ 21

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55 INTERNATIONAL ELECTROTECHNICAL COMMISSION
56 ____________
58 OPTICAL FIBRE CABLES –
60 Part 2-50: Indoor cables – Family specification for simplex
61 and duplex cables for use in terminated cable assemblies
63 FOREWORD

64 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

65 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

66 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

67 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

68 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

69 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

70 may participate in this preparatory work. International, governmental and non-governmental organizations liaising

71 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

72 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

73 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

74 consensus of opinion on the relevant subjects since each technical committee has representation from all

75 interested IEC National Committees.

76 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

77 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

78 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

79 misinterpretation by any end user.

80 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

81 transparently to the maximum extent possible in their national and regional publications. Any divergence between

82 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

83 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

84 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

85 services carried out by independent certification bodies.

86 6) All users should ensure that they have the latest edition of this publication.

87 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

88 members of its technical committees and IEC National Committees for any personal injury, property damage or

89 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

90 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

91 Publications.

92 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

93 indispensable for the correct application of this publication.

94 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

95 rights. IEC shall not be held responsible for identifying any or all such patent rights.

96 International Standard IEC 60794-2-50 has been prepared by subcommittee 86A: Fibres and

97 cables, of IEC technical committee 86: Fibre optics.

98 This document includes test methods according to IEC 60794-1-21, IEC 60794-1-22 and

99 IEC 60794-1-23 that will be split into single documents and individually renumbered in the

100 IEC 60794-1-1xx series, IEC 60794-1-2xx series and IEC 60794-1-3xx series. Full cross-

101 reference details are given in IEC 60794-1-2.

102 This third edition cancels and replaces the second edition published in 2020. This edition

103 constitutes a technical revision.

104 This edition includes the following significant technical changes with respect to the previous

105 edition:
106 a) added IEC 60793-1-46 and IEC 60794-1-211 to the normative references;
107 b) changed the load duration for the tensile test from 5 to 10 min;
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108 c) clarified the distance between the clamps for torsion test to 125 times cable diameter, but

109 not less than 0,3 m;

110 d) recommended the temperatures -10 °C and +60 °C for indoor simplex and duplex cables and

HD HD

111 included the low and high temperatures for category C, C , OP and OP according to the

112 operating service environments in IEC 61753-1 for temperature cycling and shrinkage

113 testing;

114 e) updated the shrinkage test standard to IEC 60794-1-211, F11A, and changed the

115 requirement to maximum 20 mm;
116 f) replaced the text for the fire performance with an improved description.
117 The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1972/FDIS 86A/1978/RVD
118

119 Full information on the voting for the approval of this International Standard can be found in the

120 report on voting indicated in the above table.

121 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

122 A list of all the parts in the IEC 61340 series, published under the general title Optical fibre

123 cables, can be found on the IEC website.

124 The committee has decided that the contents of this document will remain unchanged until the

125 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

126 the specific document. At this date, the document will be
127 • reconfirmed,
128 • withdrawn,
129 • replaced by a revised edition, or
130 • amended.
131

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it

contains colours which are considered to be useful for the correct understanding of its

contents. Users should therefore print this document using a colour printer.
132
133
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134
135 OPTICAL FIBRE CABLES –
136
137 Part 2-50: Indoor cables – Family specification for simplex
138 and duplex cables for use in terminated cable assemblies
139
140
141
142 1 Scope

143 This part of IEC 60794 is a family specification that specifies requirements for simplex and

144 duplex optical fibre cables for use in terminated cable assemblies or as used for termination of

145 passive components.
146 2 Normative references

147 The following documents are referred to in the text in such a way that some or all of their content

148 constitutes requirements of this document. For dated references, only the edition cited applies.

149 For undated references, the latest edition of the referenced document (including any

150 amendments) applies.

151 IEC 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures – Fibre

152 geometry

153 IEC 60793-1-21, Optical fibres – Part 1-21: Measurement methods and test procedures –

154 Coating geometry

155 IEC 60793-1-32, Optical fibres – Part 1-32: Measurement methods and test procedures –

156 Coating strippability
157 IEC 60793-1-40, Optical fibres – Part 1-40: Attenuation measurement methods

158 IEC 60793-1-46, Optical fibres – Part 1-46: Monitoring of changes in optical transmittance

159 IEC 60793-2-10, Optical fibres – Part 2-10: Product specifications – Sectional specification for

160 category A1 multimode fibres

161 IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for

162 class B single-mode fibres

163 IEC 60794-1-1, Optical fibre cables – Part 1-1: Generic specification – General

164 IEC 60794-1-2, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test

165 procedures – General guidance

166 IEC 60794-1-211, Optical fibre cables - Part 1-211: Generic specification - Basic optical cable

167 test procedures - Environmental test methods - Sheath shrinkage, Method F11

168 IEC 60794-1-21, Optical fibre cables – Part 1-21: Generic specification – Basic optical cable

169 test procedures – Mechanical tests methods
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170 IEC 60794-1-22, Optical fibre cables – Part 1-22: Generic specification – Basic optical cable

171 test procedures – Environmental tests methods

172 IEC 60794-1-23, Optical fibre cables – Part 1-23: Generic specification – Basic optical cable

173 test procedures – Cable element test methods

174 IEC 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification

175 IEC 60811-202, Electric and optical fibre cables – Test methods for non-metallic materials –

176 Part 202: General tests – Measurement of thickness of non-metallic sheath

177 IEC 60811-203, Electric and optical fibre cables – Test methods for non-metallic materials –

178 Part 203: General tests – Measurement of overall dimensions
179 3 Terms and definitions

180 For the purposes of this document, the terms and definitions given in IEC 60794-1-1 and the

181 following apply.

182 ISO and IEC maintain terminological databases for use in standardization at the following

183 addresses:
184 • IEC Electropedia: available at http://www.electropedia.org/
185 • ISO Online browsing platform: available at http://www.iso.org/obp
186 3.1
187 terminated cable assembly
188 a cable terminated with connectors

189 Note 1 to entry: Examples from ISO/IEC 11801 (all parts) are optical fibre cords used to establish connections on

190 patch panels, equipment and at work areas or to connect outlets to the terminal equipment.

191 Note 2 to entry: A so called patch cord or jumper is one type of a terminated cable assembly.

192 4 Construction
193 4.1 General

194 In addition to the constructional requirements in IEC 60794-2, the following considerations

195 apply to simplex and duplex indoor cables for use in terminated cable assemblies.

196 It is not the intention of this document to specify the finished terminated cable assembly

197 complete with terminations.

198 There shall be no fibre splice in a delivery length. It shall be possible to identify each individual

199 fibre throughout the length of the cable.
200 4.2 Optical fibres and primary coating

201 Multimode or single-mode optical fibres meeting the requirements of IEC 60793-2-10

202 sub-categories A1-OM1 or A1-OM2 to A1-OM5 or IEC 60793-2-50 class B shall be used.

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203 4.3 Buffer

204 If a tight or semi-tight (loosely applied) buffer is required, it shall consist of one or more layers

205 of inert material. Unless otherwise specified, the tight buffer shall be removed in one operation

206 together with fibre coating over the specified length. Semi-tight tubes may be filled. For semi-

207 tight and loose buffer, the buffer material is removed for a specified length leaving the primary

208 coating of the fibre intact.
209 Specified buffer strippability minimum lengths:
210 – tight: 15 mm;
211 – semi tight: 300 mm;
212 – loose: 1,0 m.

213 Strip force shall comply to the values stated in the relevant specification and the evaluation

214 shall be carried out according to IEC 60793-1-32.
215 Buffer dimensions are shown in Table 1.
216 Table 1 – Outer dimensions of buffered fibres
Nominal outer diameter Tolerance
mm mm
0,3 to 0,9 ± 0,05
217

218 Lower tolerance levels can be a requirement for buffered fibres having a low nominal diameter

219 within the specified range. In such cases, tolerance values shall be agreed between supplier

220 and customer.
221 4.4 Tube

222 One or two primary coated or buffered fibres are packaged in a tube construction which may be

223 filled. A tube is a cable element that is not covered in 4.3 and typically has a larger outer

224 diameter than what is specified in 4.3. The tube may be reinforced with a composite wall.

225 If required, the suitability of the tube shall be determined by an evaluation of its kink resistance

226 in accordance with IEC 60794-1-23, method G7.
227 4.5 Strength and anti-buckling members

228 The cable shall be designed with sufficient strength members to meet the requirements of this

229 document.

230 The strength and/or anti-buckling member may be either metallic or non-metallic and may be

231 located in the cable core and/or under the sheath and/or in the sheath.
232 4.6 Sheath

233 The cable shall have a uniform overall protective sheath. The cable diameter shall be specified

234 in the relevant specification. Sheath removal is an important feature of these cables. Sheath

235 pull-off force shall be determined in accordance with IEC 60794-1-21, method E21.

236 4.7 Sheath marking

237 If required, the cable shall be marked as agreed between the customer and supplier.

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238 4.8 Examples of cable constructions
239 Examples of cable constructions are shown in Annex A.

240 Other configurations are not excluded if they meet the mechanical, environmental, transmission

241 and termination requirements given in this document.
242 5 Tests
243 5.1 General

244 Compliance with the specification requirements shall be verified by carrying out tests selected

245 from Clause 5. It is not intended that all tests be carried out in all cases, and Annex B provides

246 guidance on the selection of applicable tests. The tests to be applied and the frequency of

247 testing need to be agreed between the customer and supplier.

248 Some of the following tests can be performed on a short sample length of cable which is still an

249 integral part of a longer length, thus making it possible to detect permanent changes in

250 attenuation. As a general requirement for the tests specified in this document, the spirit is to

251 keep "no change in attenuation" criteria at the end of each evaluation, although the parameters

252 specified in this document may be affected by measurement uncertainty arising either from

253 measurement errors or calibration errors. The optical total uncertainty of measurement for this

254 document shall be ± 0,05 dB for single-mode fibres and ± 0,2 dB for multimode fibres. Any

255 measured value within this range shall be considered as "no change in attenuation".

256 Single-mode fibre cables are measured at 1 550 nm or 1 625 nm and the measuring wavelength

257 shall be agreed between the customer and supplier. Multimode fibre cables are measured at

258 850 nm or 1 300 nm and the measuring wavelength shall be agreed between the customer and

259 supplier. Measurements of attenuation shall be carried out according to IEC 60793-1-40.

260 Change in attenuation measurements shall be carried out according to IEC 60793-1-46.

261 NOTE The optimized wavelength for multimode fibres A1-OM3 and A1-OM4 is 850 nm and for A1-OM5 fibre, the

262 targeted operational wavelength range is in the vicinity of 850 nm to 950 nm.

263 If loops are used within a test to fix the ends of a cable, the loop diameter shall be equal or

264 greater than the specified minimum cable bend diameter to avoid cable damage and excessive

265 mode filtering in multimode fibre.

266 Unless otherwise specified, all tests shall be carried out at expanded test conditions as

267 specified in IEC 60794-1-2.
268 5.2 Dimensions

269 The fibre dimensions and tolerances shall be checked in accordance with test method

270 IEC 60793‑1‑20 or IEC 60793‑1‑21. The diameter of the buffer and of the cable, as well as the

271 thickness of the sheath, shall be measured in accordance with the methods of IEC 60811-202

272 and IEC 60811-203.

273 The nominal outer cable diameter is abbreviated as “d” in this document. “d” for the different

274 cable constructions is defined as follows:
275 – For simplex cable, “d” is the outer diameter;

276 – For zip cord cable, “d” is the outer diameter of the simplex cable which is used to be

277 combined with another simplex cable to form a zip cord;
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278 – For duplex flat cable, “d” is the outer diameter of the inner cables which include the optical

279 fibre, the buffer, the strength members and the sheath;

280 – For duplex round cable, “d” is the outer diameter of the inner cables which include the optical

281 fibre, the buffer, the strength members and the sheath.
282 The cable diameter tolerance shall be ± 0,2 mm.

283 The deviation of the average sheath thickness shall be within the tolerance of ± 0,1 mm for

284 100 % of the cable length.
285 5.3 Mechanical requirements
286 5.3.1 Tensile performance
287 Method: IEC 60794-1-21, E1

288 Diameter of chuck drums and transfer devices: not less than the minimum loaded bending

289 diameter specified for the cable, at least 250 mm diameter.
290 Load for 10 min:

291 – simplex cables d < 1,2 mm at 50 N; simplex cables 1,2 mm ≤ d ≤ 2,0 mm at 70 N; simplex

292 cables d > 2,0 mm at 100 N;
293 – duplex round cables at 100 N;

294 – zipcord and duplex flat cables d ≤ 2,0 mm at 140 N; zipcord and duplex flat cables d

295 > 2,0 mm at 200 N.

296 Length of sample: sufficient to achieve the desired accuracy of measurement of attenuation

297 change shall be agreed between the customer and supplier.
298 Requirements:

299 – in all cases, fibre strain shall not exceed 60 % of the proof strain (equals to absolute 0,6 %

300 strain for 1 % proof-tested fibres);

301 – the maximum allowable increase in attenuation during the test shall be specified in the

302 relevant specification;
303 – there shall be no change in attenuation after the test.
304 5.3.2 Crush
305 Method: IEC 60794-1-21, E3A
306 Force short-term:
307 – 300 N for simplex/duplex cables with d ≤ 2,0 mm;
308 – 500 N for simplex/duplex cables with d > 2,0 mm.
309 Duration short-term: 1 min
310 Number of crushes short-term: 1
311 Force long-term:
312 – 100 N for simplex/duplex cables with d ≤ 2,0 mm;
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313 – 200 N for simplex/duplex cables with d > 2,0 mm.
314 Duration long-term: 10 min

315 Number of crushes long-term: 1, separated at least 500 mm to any other loaded position.

316 Requirements:

317 – the maximum increase in attenuation during the test with a long-term force shall be specified

318 in the relevant specification;

319 – there shall be no change in attenuation after the test with short-term and long-term force;

320 – there shall be no damage to the cable elements; any flattening of cable elements is not

321 considered as damage.

322 For cables having a non-circular cross section, the force shall be applied in the direction of the

323 minor axis (perpendicular to the major axis), as shown in Figure A.6 as an example.

324 5.3.3 Impact
325 Method: IEC 60794-1-21, E4

326 – impact energy: 0,5 J for simplex/duplex cables with d ≤ 2,0 mm; 1,0 J for simplex/duplex

327 cables with d > 2,0 mm;
328 – number of impacts: 3, each separated at least 500 mm.
329 Requirements:
330 – there shall be no change in attenuation after the test;

331 – there shall be no damage to the cable elements; any flattening of cable elements is not

332 considered as damage.

333 For cables having a non-circular cross section, the force shall be applied in the direction of the

334 minor axis (perpendicular to the major axis), as shown in Figure A.5 and Figure A.6.

335 5.3.4 Repeated bending
336 Method: IEC 60794-1-21, E6
337 Bending diameter
...

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