IEC IEC 61156-14 Edition 1.02025-05 INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications : Part 14: Symmetrical single pair cables with transmission characteristics up to 2o MHz - Work area wiring - Sectional specification IEC 61156-14:2025-05(en) ICS 33.120.20 ISBN 978-2-8327-0451-6 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright @ 2025 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or IEC member National Committee for further information. IEC Secretariat Tel.: +41 22 919 02 11 3, rue de Varembe [email protected] CH-1211 Geneva 20 www.iec.ch Switzerland About theIEC International Standards for all electrical, electronic and related technologies. AboutIECpublications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigendum or an amendment might have been published. IECpublicationssearch IEc Products&ServicesPortal-products.iec.ch webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the The advanced search enables to find IEC publications by a publications previews, graphical symbols and the giossary. variety of criteria (reference number, text, technical With a subscription you wili always have access to up to date committee, ..). It also gives information on projects, content tailored to your needs. replaced and withdrawn publications. Electropedia-www.electropedia.org IEC Just Published-webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology. Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English details all new publications released. Available online and and French, with equivalent terms in 25 additional languages. once a month by email. Alsoknownas the International Electrotechnical Vocabulary (IEV) online. IECCustomerServiceCentre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre:[email protected]. Warning!Makesurethatyouobtainedthispublicationfromanauthorizeddistributor. 2 - IEC61156-14:2025@IEC2025 CONTENTS FOREWORD 5 1 Scope 2 Normative references. 3 Terms and definitions. .8 4 Installation considerations .8 4.1 General remarks.. 8 4.2 Bending radius of installed cable.. 4.3 Climatic conditions. .8 5 Materials and cable construction 5.1 General remarks. 8 5.2 Cable construction. .8 5.3 Conductor 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... 5.10 Identification 5.11 Finished cable.. .10 6 Characteristics and requirements .10 6.1 General remarks.... .10 6.2 Electrical characteristics and tests. .10 6.2.1 Conductor resistance . 10 6.2.2 Resistance unbalance within a pair 10 6.2.3 Dielectric strength.. 10 6.2.4 Insulation resistance 10 6.2.5 Mutual capacitance ... 10 6.2.6 Capacitance unbalance 10 6.2.7 Transfer impedance .... 6.2.8 Low frequency coupling attenuation 11 6.2.9 Current-carrying capacity... 11 6.3 Transmission characteristics.. 11 6.3.1 Velocity of propagation (phase velocity) 11 6.3.2 Phase delay ... 11 6.3.3 Attenuation (a)... 12 6.3.4 Unbalance attenuation (TCL and EL TCTL) 13 6.3.5 14 6.3.6 Alien (exogenous) far-end crosstalk (Ps AACR-F). 6.3.7 Impedance. .14 6.3.8 Return loss (RL) .15 6.4 Mechanical and dimensional characteristics and requirements 15 6.4.1 Dimensional requirements.. 15 6.4.2 Elongation at break of the conductors 15 6.4.3 Tensile strength of the insulation 15 6.4.4 Elongation at break of the insulation 15 - 3 - IEC61156-14:2025IEC2025 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 .16 6.4.8 Crushtest of the cable .16 6.4.9 Impact test of the cable .16 6.4.10 Bendi