1、IEC 61156-6 Edition 4.0 2020-04 INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 6:Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz Work area wiring Sectional specification IEC 61156-6:2020-04(en)THIS PUBLICATION IS COPYR
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9、glish and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC 61156-6 Edition 4.0 2020-04 INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital
10、 communications Part 6:Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz Work area wiring Sectional specification INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.120.20 ISBN 978-2-8322-7971-7 Registered trademark of the International Electrotechnical Commission Warning!
11、Make sure that you obtained this publication from an authorized distributor.2 IEC 61156-6:2020 IEC 2020 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 conditio
12、ns.8 5 Materials and cable construction.8 5.1 General remarks.8 5.2 Cable construction.9 5.2.1 Conductor.9 5.2.2 Insulation.9 5.2.3 Cable element.9 5.2.4 Cable make-up.9 5.2.5 Screening of the cable core.9 5.2.6 Sheath.9 5.2.7 Identification.10 5.2.8 Finished cable.10 6 Characteristics and requireme
13、nts.10 6.1 General remarks.10 6.2 Electrical 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 atte
14、nuation.11 6.2.9 Current-carrying capacity.12 6.3 Transmission characteristics.12 6.3.1 Velocity of propagation(phase velocity).12 6.3.2 Phase delay and differential delay(delay skew).12 6.3.3 Attenuation.12 6.3.4 Unbalance attenuation(TCL).13 6.3.5 Near-end crosstalk(NEXT).14 6.3.6 Attenuation to c
15、rosstalk ratio far end(PS ACR-F).15 6.3.7 Alien(exogenous)near end crosstalk.15 6.3.8 Alien(exogenous)far-end crosstalk(AACR-F).16 6.3.9 Alien(exogenous)crosstalk of bundled cables.16 6.3.10 Impedance.16 6.3.11 Return loss(RL).16 6.4 Mechanical and dimensional characteristics and requirements.17 6.4
16、.1 Dimensional requirements.17 6.4.2 Elongation at break of the conductors.17 IEC 61156-6:2020 IEC 2020 3 6.4.3 Tensile strength of the insulation.17 6.4.4 Elongation at break of the insulation.17 6.4.5 Adhesion of the insulation to the conductor.17 6.4.6 Elongation at break of the sheath.17 6.4.7 Tensile strength of the sheath.17 6.4.8 Crush test of the cable.17 6.4.9 Impact test of the cable.18 6.4.10 Bending under tension.18 6.4.11 Repeated bending of the cable.18 6.4.12 Tensile performance o
