IEC 61156-5:2002

INTERNATIONAL IEC
STANDARD
61156-5
First edition
2002-03
Multicore and symmetrical pair/quad cables
for digital communications –
Part 5:
Symmetrical pair/quad cables with transmission
characteristics up to 600 MHz–
Horizontal floor wiring – Sectional specification
Câbles multiconducteurs à paires symétriques et quartes
pour transmissions numériques –
Partie 5:
Câbles à paires symétriques et quartes avec caractéristiques
de transmission allant jusqu'à 600 MHz –
Câble capillaire – Spécification intermédiaire

Reference number
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INTERNATIONAL IEC
STANDARD
61156-5
First edition
2002-03
Multicore and symmetrical pair/quad cables
for digital communications –
Part 5:
Symmetrical pair/quad cables with transmission
characteristics up to 600 MHz–
Horizontal floor wiring – Sectional specification
Câbles multiconducteurs à paires symétriques et quartes
pour transmissions numériques –
Partie 5:
Câbles à paires symétriques et quartes avec caractéristiques
de transmission allant jusqu'à 600 MHz –
Câble capillaire – Spécification intermédiaire

 IEC 2002  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
U
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 61156-5  IEC:2002(E)
CONTENTS
FOREWORD.4

1 General .5

1.1 Scope.5

1.2 Normative references .6

1.3 Installation considerations.6

1.4 Climatic conditions.6

2 Definitions, materials and cable construction.6
2.1 Definitions .6
2.2 Materials and cable construction.6
2.2.1 General remarks.6
2.2.2 Cable construction .6
2.2.3 Conductor.6
2.2.4 Insulation.6
2.2.5 Colour code of insulation.7
2.2.6 Cable element .7
2.2.7 Screening of cable element.7
2.2.8 Cable make-up .7
2.2.9 Screening of cable core .7
2.2.10 Sheath.7
2.2.11 Colour of sheath .7
2.2.12 Identification .7
2.2.13 Finished cable .8
3 Characteristics and requirements.8
3.1 General remarks.8
3.2 Electrical characteristics .8
3.2.1 Conductor resistance .8
3.2.2 Resistance unbalance.8
3.2.3 Dielectric strength.8
3.2.4 Insulation resistance .8
3.2.5 Mutual capacitance .8
3.2.6 Capacitance unbalance pair to ground.8
3.2.7 Transfer impedance.8

3.2.8 Resistance of the screen.9
3.3 Transmission characteristics.9
3.3.1 Velocity of propagation, delay and differential delay (delay skew) .9
3.3.2 Attenuation .10
3.3.3 Unbalance attenuation .11
3.3.4 Near-end crosstalk.11
3.3.5 Far-end crosstalk (FEXT).12
3.3.6 Characteristic impedance.13
3.3.7 Return loss (RL) .14
3.3.8 Screening attenuation .14
3.3.9 Coupling attenuation .14
3.3.10 Crosstalk in bundled cable .15
3.3.11 Alien crosstalk .15

61156-5  IEC:2002(E) – 3 –
3.4 Mechanical and dimensional characteristics and requirements .15

3.4.1 Dimensional requirements.15

3.4.2 Elongation at break of the conductors .15

3.4.3 Elongation at break of the insulation.15

3.4.4 Elongation at break of the sheath.15

3.4.5 Tensile strength of the sheath .15

3.4.6 Crush test of the cable.16

3.4.7 Impact test of the cable.16

3.4.8 Bending under tension .16

3.4.9 Tensile performance of the cable .16

3.5 Environmental characteristics .16
3.5.1 Shrinkage of insulation.16
3.5.2 Wrapping test of insulation after thermal ageing .16
3.5.3 Bending test of insulation at low temperature .16
3.5.4 Elongation at break of the sheath after ageing.16
3.5.5 Tensile strength of the sheath after ageing.16
3.5.6 Sheath pressure test at high temperature.16
3.5.7 Cold bend test of the cable .16
3.5.8 Heat shock test.17
3.5.9 Flame propagation characteristics of a single cable.17
3.5.10 Flame propagation characteristics of bunched cables.17
3.5.11 Acid gas evolution.17
3.5.12 Smoke generation.17
3.5.13 Toxic gas emission .17
3.5.14 Combined flame and smoke test .17
4 Introduction to the blank detail specification .17
Annex A (informative) Cable performance at temperatures higher than 20 °C.18
Annex B (informative) Insertion loss deviation as a result of cascading components
with differing impedance.22

– 4 – 61156-5  IEC:2002(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES

FOR DIGITAL COMMUNICATIONS –
Part 5: Symmetrical pair/quad cables

with transmission characteristics up to 600 MHz –

Horizontal floor wiring – Sectional specification

FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all
national electrotechnical committees (IEC National Committees). The object of the 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 other activities, the IEC publishes International Standards. Their preparation is entrusted to technical
committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work.
International, governmental and non-governmental organizations liaising with the IEC also participate in this
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standards, technical specifications, technical reports or guides and they are accepted by the National Committees
in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards
transparently to the maximum extent possible in their national and regional standards. Any divergence between the
IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61156-5 has been prepared by subcommittee 46C: Wires and
symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, RF connectors and
accessories for communication and signalling.
The text of this standard is based on the foll
...