1、 IEC 61156-12 Edition 1.0 2021-01 INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 12:Symmetrical single pair cables with transmission characteristics up to 600 MHz Work area wiring Sectional specification IEC 61156-12:2021-01(en)THIS PUBLICATION IS C
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9、d French,with equivalent terms in 18 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC 61156-12 Edition 1.0 2021-01 INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 12:Symmetrical single pair cables with t
10、ransmission characteristics up to 600 MHz Work area wiring Sectional specification INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.120.20 ISBN 978-2-8322-9230-3 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authori
11、zed distributor.2 IEC 61156-12:2021 IEC 2021 CONTENTS FOREWORD.5 1 Scope.7 2 Normative references.7 3 Terms and definitions.8 4 Installation considerations.8 4.1 General remarks.8 4.2 Bending radius of installed cable.8 4.3 Climatic conditions.8 5 Materials and cable construction.8 5.1 General remar
12、ks.8 5.2 Cable construction.9 5.3 Conductor.9 5.4 Insulation.9 5.5 Cable element.9 5.6 Screening of the cable element.9 5.7 Cable make-up.9 5.8 Screening of the cable core.9 5.9 Sheath.9 5.10 Identification.10 5.11 Finished cable.10 6 Characteristics and requirements.10 6.1 General remarks.10 6.2 El
13、ectrical characteristics and tests.10 6.2.1 Conductor resistance.10 6.2.2 Resistance unbalance.10 6.2.3 Dielectric strength.11 6.2.4 Insulation resistance.11 6.2.5 Mutual capacitance.11 6.2.6 Capacitance unbalance.11 6.2.7 Transfer impedance.11 6.2.8 Coupling attenuation.11 6.2.9 Current-carrying ca
14、pacity.12 6.3 Transmission characteristics.12 6.3.1 Velocity of propagation(phase velocity).12 6.3.2 Phase delay.12 6.3.3 Attenuation().12 6.3.4 Unbalance attenuation(TCL and ELTCTL).13 6.3.5 Alien(exogenous)near-end crosstalk(PS ANEXT).13 6.3.6 Alien(exogenous)far-end crosstalk(PS AACR-F).14 6.3.7
15、Alien(exogenous)crosstalk of bundled cables.14 6.3.8 Impedance.14 6.3.9 Return loss(RL).14 6.4 Mechanical and dimensional characteristics and requirements.15 6.4.1 Dimensional requirements.15 6.4.2 Elongation at break of the conductor.15 6.4.3 Tensile strength of the insulation.15 IEC 61156-12:2021
16、IEC 2021 3 6.4.4 Elongation at break of the insulation.15 6.4.5 Adhesion of the insulation to the conductor.15 6.4.6 Elongation at break of the sheath.15 6.4.7 Tensile strength of the sheath.15 6.4.8 Crush test of the cable.15 6.4.9 Impact test of the cable.15 6.4.10 Bending under tension.16 6.4.11 Repeated bending of the cable.16 6.4.12 Tensile performance of the cable.16 6.4.13 Shock-test requirements of the cable.16 6.4.14 Bump-test requirements of the cable.16 6.4.15 Vibration-test requireme
