1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22547-6 SANS 60794-2-20:2009 Edition 2 IEC 60794-2-20:2008 Edition 2SOUTH AFRICAN NATIONAL STANDARD Optical fibre cables Part 2-20: Indoor
4、 cables Family specification for multi-fibre optical distribution cables This national standard is the identical implementation of IEC 60794-2-20:2008 and is adopted with the permission of the International Electrotechnical Commission. Published by SABS Standards Division 1 Dr Lategan Road Groenkloo
5、f Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 60794-2-20:2009 Edition 2 IEC 60794-2-20:2008 Edition 2 Table of changes Change No. Date Scope N
6、ational foreword This South African standard was approved by National Committee SABS SC 74A, Communication technology Fibre optics, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in March 2009. This
7、SANS document supersedes SANS 60794-2-20:2006 (edition 1). This standard may only be used and printed by approved subscription and freemailing clients of the SABS. IEC 60794-2-20 Edition 2.0 2008-11 INTERNATIONAL STANDARD Optical fibre cables Part 2-20: Indoor cables Family specification for multi-f
8、ibre optical distribution cables INTERNATIONAL ELECTROTECHNICAL COMMISSION T ICS 33.180.01 PRICE CODE ISBN 2-8318-1015-7 Registered trademark of the International Electrotechnical Commission SANS 60794-2-20:2009This standard may only be used and printed by approved subscription and freemailing clien
9、ts of the SABS. 2 60794-2-20 IEC:2008(E) CONTENTS FOREWORD.4 1 Scope.6 2 Normative references .6 3 Construction.6 3.1 General .6 3.2 Optical fibres and primary coating .7 3.3 Buffer 7 3.4 Ruggedised fibre .7 3.5 Slotted core.7 3.6 Tube7 3.7 Stranded tube7 3.8 Ribbon structure8 3.9 Strength and anti-
10、buckling members .8 3.10 Ripcord .8 3.11 Sheath 8 3.12 Sheath marking .8 3.13 Identification8 3.14 Examples of cable constructions .8 4 Tests8 4.1 Dimensions .8 4.2 Mechanical requirements.9 4.2.1 Cable tensile performance.9 4.2.2 Cable crush .9 4.2.3 Cable impact .9 4.2.4 Cable bending .10 4.2.5 Ca
11、ble repeated bending 10 4.2.6 Cable bending under tension .10 4.2.7 Cable bending at low temperature .10 4.2.8 Cable flexing .10 4.2.9 Cable torsion.10 4.2.10 Cable kink .11 4.3 Environmental requirements Temperature cycling 11 4.4 Transmission requirements .11 4.5 Fire performance.11 Annex A (infor
12、mative) Examples of cable constructions .13 Annex B (informative) Family specification for multi-fibre optical distribution cables Blank detail specification and minimum requirements .18 Bibliography24 Figure A.1 Example of cross-section of a 12 fibre distribution cable.13 Figure A.2 Example of cros
13、s-section of a 36 fibre distribution cable.13 Figure A.3 Example of cross-section of a 6 fibre break-out cable .14 Figure A.4 Example of cross-section of a 24 fibre break-out cable .14 Figure A.5 Example of cross-section of a slotted core type indoor cable with 4 fibre ribbons .15 SANS 60794-2-20:20
14、09This standard may only be used and printed by approved subscription and freemailing clients of the SABS.60794-2-20 IEC:2008(E) 3 Figure A.6 Example of cross-section of an SZ (reverse oscillating lay) slotted core type indoor cable with 2 fibre ribbons15 Figure A.7 Example of cross-section of an SZ
15、 (reverse oscillating lay) slotted core type indoor cable with 4 fibre bundles.16 Figure A.8 Example of multi-fibre unitube cable .16 Figure A.9 Example of multi-fibre cable17 Table 1 Dimensions of buffered fibres7 Table 2 Sample temperature cycling values .11 Table B.1 Cable description .18 Table B
16、.2 Cable element19 Table B.3 Cable construction .20 Table B.4 Installation and operating conditions 20 Table B.5 Tests applicable.21 Table B.6 Specifications for industrial premises installations as defined in ISO/IEC 2470222 SANS 60794-2-20:2009This standard may only be used and printed by approved
17、 subscription and freemailing clients of the SABS. 4 60794-2-20 IEC:2008(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRE CABLES Part 2-20: Indoor cables Family specification for multi-fibre optical distribution cables FOREWORD 1) The International Electrotechnical Commission (IEC) is a
18、worldwide organization for standardization comprising all 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 oth
19、er activities, IEC publishes International Standards, Technical 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
20、subject dealt with may participate in this preparatory 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 condition
21、s determined by agreement between the two organizations. 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
22、 Committees. 3) IEC Publications have the form of recommendations 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
23、 which they are used or for any misinterpretation by any 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 Pub
24、lication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensur
25、e 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 personal injury, property damage or other damage of an
26、y 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 references cited in this publication. Use of the refe
27、renced 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 responsible for identifying any or all such patent rights. Inter
28、national Standard IEC 60794-2-20 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This second edition cancels and replaces the first edition published in 2003. It constitutes a technical revision. The main changes from the previous edition includ
29、e: cable crush to be measured both during and after load; cable torsion test length parameter correlated to cable outer diameter; cable description and construction blank detail specification annexes; MICE environment blank detail specification is addressed in Annex B. This standard is to be used in
30、 conjunction with IEC 60794-1-1 and IEC 60794-1-2, and IEC 60794-2. SANS 60794-2-20:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.60794-2-20 IEC:2008(E) 5 The text of this standard is based on the following documents: CDV Report on voting
31、 86A/1187/CDV 86A/1221/RVC 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. A list of all parts of IEC 60794 series, published under
32、 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 maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publicatio
33、n. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. SANS 60794-2-20:2009This standard may only be used and printed by approved subscription and freemailing clients of the SA
34、BS. 6 60794-2-20 IEC:2008(E) OPTICAL FIBRE CABLES Part 2-20: Indoor cables Family specification for multi-fibre optical distribution cables 1 Scope This part of IEC 60794 is a family specification covering multi-fibre optical distribution cables for indoor use. The requirements of the sectional spec
35、ification IEC 60794-2 are applicable to cables covered by this standard. Annex B contains requirements that supersede the normal requirements in case the cables are intended to be used in installation governed by the MICE table of ISO/IEC 24702 (i.e. Industrial premises). 2 Normative references The
36、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) applies. They complete the normative references already listed
37、 in the generic specification (IEC 60794-1-1, Clause 2, and IEC 60794-1-2, Clause 2). IEC 60189-1, Low-frequency cables and wires with PVC insulation and PVC sheath Part 1: General test and measuring methods IEC 60304, Standard colours for insulation for low-frequency cables and wires IEC 60793-2-10
38、, Optical fibres Part 2-10: Product specifications Sectional specification for category A1 multimode fibres IEC 60793-2-50, Optical fibres Part 2-50: Product specifications Sectional specification for class B single-mode fibres IEC 60794-2, Optical fibre cables Part 2: Indoor cables Sectional specif
39、ication IEC 60811-1-4, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general application Section four: Tests at low temperature IEC 62222, Fire performance of communication cables installed in buildings 3 Construction 3.1 General In addition to the
40、 constructional requirements in IEC 60794-2, the following considerations apply to multi-fibre indoor cables. The cable shall be designed and manufactured for an expected operating lifetime of at least 15 years. In this context, the attenuation at the operational wavelength(s) of the optical fibres
41、contained in the installed cable shall not exceed values agreed between customer and SANS 60794-2-20:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.60794-2-20 IEC:2008(E) 7 supplier. The materials in the cable shall not present a health or
42、 environmental hazard within its intended use. There shall be no fibre splice in a delivery length unless otherwise agreed by customer and supplier. It shall be possible to identify each individual fibre throughout the length of the cable. 3.2 Optical fibres and primary coating A1 multimode fibres w
43、hich meet the requirements of IEC 60793-2-10 or B1.1, B1.3, B6_a, and B6_b single-mode optical fibres which meet the requirements of IEC 60793-2-50 shall be used. The linear coefficient of optical fibre attenuation and attenuation point discontinuity may be affected by the cable manufacturing proces
44、s. Maximum values for these optical characteristics shall be agreed between customer and supplier. 3.3 Buffer If a tight or semi-tight (loosely applied) buffer is required, it shall consist of one or more layers of inert material. The buffer shall be easily removable. For tight buffers, the buffer a
45、nd fibre primary coating shall be removable in one operation over a length of 15 mm to 25 mm, depending on customer requirements. For semi-tight buffers, the buffer shall be easily removable over a length of 0,3 m to 2,0 m. Buffer dimensions are shown in Table 1. Table 1 Dimensions of buffered fibre
46、s Buffer type Nominal diameter mm Tolerances mm Semi-tight buffer 0,3 - 1,3 0,05 Tight buffer 0,3 - 1,0 0,05 3.4 Ruggedised fibre Further protection can be provided to tight or semi-tight secondary coated fibres by surrounding them with non-metallic strength members within a sheath of suitable mater
47、ial. 3.5 Slotted core The slotted core is obtained by extruding a suitable material with a defined number of slots, providing helical or SZ (reverse-oscillating lay) configuration along the core. One or more primary coated fibres or optical elements such as ribbons or fibre bundles are located in ea
48、ch slot. 3.6 Tube One or more primary coated or buffered fibres or ribbons are packaged (loosely or not) in a tube construction which may be filled. The tube may be reinforced with a composite wall. 3.7 Stranded tube Multiple tubes, containing one or more primary coated or buffered fibres or ribbons
49、, are stranded around a central member. For the sake of preserving cable geometry, some tubes may be “filler“ or “empty“ elements not containing optical fibres. SANS 60794-2-20:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 8 60794-2-20 IEC:2008(E) 3.8 Ribbon structure Ribbon structures shall conform to IEC 60794-3, 6.5 and 8.2.3. Fibres shall be arranged to be parallel and formed int
