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)colourinsideCopyrighted material licensed to BR Demo by Thomso
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10、ted.Uncontrolled when printed.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 INTERNATIONAL ELECTROTECHNICAL COMMISSION V ICS 33.180.
11、10 PRICE CODE ISBN 978-2-83220-434-4 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinsideCopyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27
12、-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.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 fibres.9 General.9 4.1 Attenuation.9 4.2 Attenuation coefficient.9 4.
13、2.1 Attenuation discontinuities.9 4.2.2 Cut-off wavelength of cabled fibre.9 4.3 Fibre colouring.9 4.4 Polarisation mode dispersion(PMD).9 4.55 Cable elements.9 6 Optical fibre cable constructions.10 General.10 6.1 Optical unit.10 6.2 Cable protection elements.10 6.37 Main requirements for installat
14、ion and operating conditions.11 8 Cable design considerations.11 9 Cable tests.12 General.12 9.1 Classification of tests.12 9.2 Type tests.12 9.2.1 Factory acceptance tests.13 9.2.2 Routine tests.13 9.2.3 Tensile performance.13 9.3 General.13 9.3.1 Maximum allowed tension(MAT).13 9.3.2 Installation
15、capability.13 9.4 General.13 9.4.1 Sheave test.13 9.4.2 Repeated bending.14 9.4.3 Impact.14 9.4.4 Crush.15 9.4.5 Kink.15 9.4.6 Torsion.15 9.4.7 Vibration testing.16 9.5 Aeolian vibration test.16 9.5.1 Low frequency vibration test(galloping test).16 9.5.2 Temperature cycling.17 9.6 Water penetration.
16、18 9.7 Weathering resistance.18 9.8Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.60794-4-20 IEC:2012(E)3 Tracking and erosion resistance test.18 9.9 Creep behaviour.19 9.10 Fitting compatibility.19 9.1110 Factory acceptance tests.19 11 Routine tests.19 12 Quality assurance.20 Annex A(informative)Packaging and marking.21 Annex B(informative)I
