1、 IEC 60794-4-20 Edition 1.0 2012-10 INTERNATIONAL STANDARD Optical fibre cables Part 4-20: Aerial optical cables along electrical power lines Family specification for ADSS (All Dielectric Self Supported) optical cables IEC 60794-4-20:2012(E) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copy
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9、dition 1.0 2012-10 INTERNATIONAL STANDARD Optical fibre cables Part 4-20: Aerial optical cables along electrical power lines Family specification for ADSS (All Dielectric Self Supported) optical cables INTERNATIONAL ELECTROTECHNICAL COMMISSION V ICS 33.180.10 PRICE CODE ISBN 978-2-83220-434-4 Regist
10、ered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 60794-4-20 IEC:2012(E) CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3 Terms, definitions and abbreviations 7 4 Optical
11、 fibres 9 General . 9 4.1Attenuation 9 4.2Attenuation coefficient . 9 4.2.1Attenuation discontinuities . 9 4.2.2Cut-off wavelength of cabled fibre . 9 4.3Fibre colouring 9 4.4Polarisation mode dispersion (PMD) 9 4.5 5 Cable elements 9 6 Optical fibre cable constructions . 10 General . 10 6.1Optical
12、unit 10 6.2Cable protection elements . 10 6.3 7 Main requirements for installation and operating conditions 11 8 Cable design considerations . 11 9 Cable tests . 12 General . 12 9.1Classification of tests 12 9.2Type tests . 12 9.2.1Factory acceptance tests . 13 9.2.2Routine tests . 13 9.2.3Tensile p
13、erformance 13 9.3General . 13 9.3.1Maximum allowed tension (MAT) . 13 9.3.2Installation capability . 13 9.4General . 13 9.4.1Sheave test . 13 9.4.2Repeated bending . 14 9.4.3Impact . 14 9.4.4Crush 15 9.4.5Kink . 15 9.4.6Torsion 15 9.4.7Vibration testing 16 9.5Aeolian vibration test . 16 9.5.1Low fre
14、quency vibration test (galloping test) 16 9.5.2Temperature cycling 17 9.6Water penetration 18 9.7Weathering resistance . 18 9.860794-4-20 IEC:2012(E) 3 Tracking and erosion resistance test . 18 9.9Creep behaviour 19 9.10Fitting compatibility . 19 9.11 10 Factory acceptance tests 19 11 Routine tests
15、19 12 Quality assurance . 20 Annex A (informative) Packaging and marking . 21 Annex B (informative) Installation considerations for ADSS cables. 22 Annex C (informative) Electrical test (TRACKING) . 23 Annex D (informative) All Dielectric Self-Supported (ADSS) cables to be used in overhead power lin
16、es (Blank detail specification) 31 Bibliography 33 Figure C.1 Draft of test equipment . 25 Figure C.2 Test chamber . 25 Figure C.3 Electric scheme for the test 27 Figure C.4 Details of the sample 27 Figure C.5 Nozzle 28 Figure C.6 Details for the spraying . 29 Figure C.7 Pollution model . 30 Figure
17、C.8 Basic circuit for arcing test 30 Table 1 Cable design characteristics 11 Table 2 Optional parameters (if required by customer) . 12 Table C.1 R eqand C eqvalues for different pollution index values 29 Table D.1 Blank detail specification . 31 4 60794-4-20 IEC:2012(E) INTERNATIONAL ELECTROTECHNIC
18、AL COMMISSION _ OPTICAL FIBRE CABLES Part 4-20: Aerial optical cables along electrical power lines Family specification for ADSS (All Dielectric Self Supported) optical cables FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising a
19、ll national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, T
20、echnical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory
21、work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations
22、 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recom
23、mendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by an
24、y end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional pub
25、lication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by indep
26、endent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any
27、personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative
28、 references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsibl
29、e for identifying any or all such patent rights. International Standard IEC 60794-4-20 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. The text of this standard is based on the following documents: FDIS Report on voting 86A/1467/FDIS 86A/1482/RV
30、D Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 60794-4-20 IEC:2012(E) 5 A list of all the parts in the IEC 60794 series, publish
31、ed under the general title Optical fibre cables, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication
32、 At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this standard may be published at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are consid
33、ered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 6 60794-4-20 IEC:2012(E) OPTICAL FIBRE CABLES Part 4-20: Aerial optical cables along electrical power lines Family specification for ADSS (All Dielectric Self Supported
34、) optical cables 1 Scope This part of IEC 60794, which is a family specification, covers optical telecommunication cables, commonly with single-mode fibres to be used primarily in overhead power lines applications. The cable may also be used in other overhead utility networks, such as for telephony
35、or TV services. Requirements of the sectional specification IEC 60794-4 for aerial optical cables along electrical power lines are applicable to cables covered by this standard. NOTE In some particular situations in the electrical industry, short overhead links can be also designed with multimode fi
36、bres. The ADSS cable consists of single-mode optical fibres contained in one or more protective dielectric fibre optic units surrounded by or attached to suitable dielectric strength members and sheaths. The cable does not contain metallic components. An ADSS cable is designed to meet the optical an
37、d mechanical requirements under different types of installation, operating and environmental conditions and loading, as described in Annex B. This standard covers the construction, mechanical, electrical, and optical performance, installation guidelines, acceptance criteria, test requirements, envir
38、onmental considerations, and accessories compatibility for an all dielectric, self-supporting fibre optic (ADSS) cable. The standard provides both construction and performance requirements that ensure, within the guidelines of this standard, that the mechanical capabilities of the cable components a
39、nd maintenance of optical fibre integrity and optical transmissions are proper. This standard excludes any “lashed” or “wrapped” OPAC cables. Cables intended for installation in conformity with ISO/IEC 24702 and related standards may require the specification of additional tests to ensure their suit
40、ability in the applicable environments defined by the mechanical, ingress, climatic and chemical, and electromagnetic (MICE) classification. These tests are outside of the scope of IEC 60794 cable specifications, and MICE criteria are not part of the requirements for IEC 60794 specifications. The MI
41、CE tests may be the same as, similar to, or substantially different from, the tests required by IEC 60794 specifications. Cables manufactured per IEC 60794 specifications may or may not meet the MICE criteria. For supplemental discussion, see IEC/TR 62362. 2 Normative references The following docume
42、nts, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60304, Standard colours
43、 for insulation for low-frequency cables and wires IEC 60793-1-40, Optical fibres Part 1-40: Measurement methods and test procedures Attenuation 60794-4-20 IEC:2012(E) 7 IEC 60793-1-44, Optical fibres Part 1-44: Measurement methods and test procedures Cut- off wavelength IEC 60793-1-48, Optical fibr
44、es Part 1-48: Measurement methods and test procedures Polarization mode dispersion IEC 60793-2-50, Optical fibres Part 2-50: Product specifications Sectional specification for class B single-mode fibres IEC 60794-1-1, Optical fibre cables Part 1: Generic specification General IEC 60794-1-2, Optical
45、fibre cables Part 1-2: Generic specification Basic optical cable test procedures 1 , 2IEC 60794-1-22, Optical fibre cables Part 1-22: Generic specification Basic optical cable test procedures Environmental test methods IEC 60794-1-23, Optical fibre cables Part 1-23: Generic specification Basic optic
46、al cable test procedures Cable element test methods IEC 60794-4, Optical fibre cables Part 4: Sectional Specification Aerial optical cables along electrical power lines IEC 61395, Overhead electrical conductors Creep test procedures for stranded conductors 3 Terms, definitions and abbreviations For
47、the purposes of this document, the terms and definitions given in IEC 60794-1-1 and IEC 60794-4, as well as the following, apply. 3.1 maximum allowable tension MAT maximum tensile load that may be applied to the cable without detriment to the performance requirements (optical performance, fibre dura
48、bility) due to fibre strain Note 1 to entry: Due to installation codes the MAT value is sometimes restricted to be less than 60 % of the breaking tension of the cable. 3.2 maximum operation tension MOT tensile load that can be applied to the cable either permanently or for a long term without produc
49、ing any strain to the fibres Note 1 to entry: This condition should correspond to the tension with no ice and no gale wind at average mean temperatures throughout the year, assumed to be between 16 C and 20 C. 3.3 zero strain margin tensile load that the cable can sustain without strain on fibres due to cable elongation _ 1This document has been withdrawn, but can still be purchased, if necessary. Until IEC 60794-1-21 will be av
