Multicore and symmetrical pair/quad cables for digital communications - Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz - Horizontal floor wiring - Sectional specification

IEC 61156-5:2020 is available as IEC 61156-5:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61156-5:2020 describes the cables intended primarily for horizontal floor wiring as defined in ISO/IEC 11801. It covers cable designs comprising individually screened, common screened and unscreened pairs or quads. The transmission characteristics and the frequency range of the cables are specified at 20 °C. The cables covered by this document are intended to operate with voltages and currents normally encountered in communication systems Those cables are intended to be used to support the delivery of low voltage remote powering applications such as IEEE 802.3af (Power over Ethernet) or further developments for example according to IEEE 802.3at or IEEE 802.3bt. This third edition cancels and replaces the second edition published in 2009 and Amendment 1:2012. This edition includes the following significant technical changes with respect to the previous edition
- additional balance levels with respect to MICE implementation by certain cabling specifications;
- reference to current standards and technical reports with respect to measurement techniques and remote powering.

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Status
Published
Publication Date
02-Apr-2020
Current Stage
PPUB - Publication issued
Completion Date
03-Apr-2020
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IEC 61156-5:2020 - Multicore and symmetrical pair/quad cables for digital communications - Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz - Horizontal floor wiring - Sectional specification
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IEC 61156-5
Edition 3.0 2020-04
INTERNATIONAL
STANDARD
Multicore and symmetrical pair/quad cables for digital communications –
Part 5: Symmetrical pair/quad cables with transmission characteristics
up to 1 000 MHz – Horizontal floor wiring – Sectional specification
IEC 61156-5:2020-04(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61156-5
Edition 3.0 2020-04
INTERNATIONAL
STANDARD
Multicore and symmetrical pair/quad cables for digital communications –
Part 5: Symmetrical pair/quad cables with transmission characteristics
up to 1 000 MHz – Horizontal floor wiring – Sectional specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-7970-0

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 61156-5:2020 © 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 conditions .................................................................................................. 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 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.................................................................................... 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 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 (α) ............................................................................................... 12

6.3.4 Unbalance attenuation (TCL) ......................................................................... 13

6.3.5 Near-end crosstalk (NEXT) ............................................................................. 14

6.3.6 Far-end crosstalk (ACR-F) .............................................................................. 15

6.3.7 Alien (exogenous) near-end crosstalk (ANEXT) .............................................. 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

6.4.1 Dimensional requirements ............................................................................. 17

6.4.2 Elongation at break of the conductors ............................................................ 17

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IEC 61156-5:2020 © 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 of the cable ................................................................... 18

6.4.13 Shock-test requirements of the cable ............................................................. 18

6.4.14 Bump-test requirements of the cable ............................................................. 18

6.4.15 Vibration-test requirements of the cable ......................................................... 18

6.5 Environmental characteristics ............................................................................... 18

6.5.1 Shrinkage of insulation .................................................................................. 18

6.5.2 Wrapping test of insulation after thermal ageing ............................................ 18

6.5.3 Bending test of insulation at low temperature ................................................. 18

6.5.4 Elongation at break of the sheath after ageing ............................................... 18

6.5.5 Tensile strength of the sheath after ageing .................................................... 18

6.5.6 Sheath pressure test at high temperature ...................................................... 19

6.5.7 Cold bend test of the cable ............................................................................ 19

6.5.8 Heat shock test .............................................................................................. 19

6.5.9 Damp heat steady state ................................................................................. 19

6.5.10 Solar radiation (UV test) ................................................................................ 19

6.5.11 Solvents and contaminating fluids .................................................................. 19

6.5.12 Salt mist and sulphur dioxide ......................................................................... 19

6.5.13 Water immersion ........................................................................................... 19

6.5.14 Hygroscopicity ............................................................................................... 19

6.5.15 Wicking.......................................................................................................... 19

6.5.16 Flame propagation characteristics of a single cable ....................................... 19

6.5.17 Flame propagation characteristics of bunched cables .................................... 19

6.5.18 Halogen gas evolution ................................................................................... 19

6.5.19 Smoke generation .......................................................................................... 20

6.5.20 Toxic gas emission ........................................................................................ 20

6.5.21 Integrated fire test ......................................................................................... 20

7 Category 5e multipair cable ........................................................................................... 20

7.1 General ................................................................................................................. 20

7.2 Transmission ........................................................................................................ 20

8 Introduction to the blank detail specification .................................................................. 20

Annex A (informative) Blank detail specification ................................................................... 22

Bibliography .......................................................................................................................... 27

Table 1 – Cable categories ..................................................................................................... 7

Table 2 – Transfer impedance .............................................................................................. 11

Table 3 – Coupling attenuation in dB .................................................................................... 12

Table 4 – Attenuation equation constants ............................................................................. 13

Table 5 – Near-end unbalance attenuation ............................................................................ 14

Table 6 – Worst-pair PS NEXT(1) values ................................................................................ 15

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– 4 – IEC 61156-5:2020 © IEC 2020

Table 7 – Worst-pair PS ACR-F (1) values ............................................................................. 15

Table 8 – PS ANEXT .............................................................................................................. 16

Table 9 – PS AACR-F ............................................................................................................. 16

Table 10 – Return loss .......................................................................................................... 17

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IEC 61156-5:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 5: Symmetrical pair/quad cables with transmission
characteristics up to 1 000 MHz – Horizontal floor wiring –
Sectional specification
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). 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 preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. 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,

RF and microwave passive components and accessories.
This third edition cancels and replaces the second edition published in 2009 and
Amendment 1:2012. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) additional balance levels with respect to MICE implementation by certain cabling

specifications;
---------------------- Page: 7 ----------------------
– 6 – IEC 61156-5:2020 © IEC 2020

b) reference to current standards and technical reports with respect to measurement

techniques and remote powering.
The text of this International Standard is based on the following documents:
FDIS Report on voting
46C/1140/FDIS 46C/1144/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

This International Standard is to be used in conjunction with IEC 61156-1:2007 and

IEC 61156-1:2007/AMD1:2009.

A list of all parts in the IEC 61156 series, published under the general title Multicore and

symmetrical pair/quad cables for digital communications, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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IEC 61156-5:2020 © IEC 2020 – 7 –
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 5: Symmetrical pair/quad cables with transmission
characteristics up to 1 000 MHz – Horizontal floor wiring –
Sectional specification
1 Scope

This part of IEC 61156 describes the cables intended primarily for horizontal floor wiring as

defined in ISO/IEC 11801 (all parts).

It covers cable designs comprising individually screened, common screened and unscreened

pairs or quads. The transmission characteristics and the frequency range (see Table 1) of the

cables are specified at 20 °C.
Table 1 – Cable categories
Maximum referenced
Cable designation frequency
MHz
Category 5e 100
Category 6 250
Category 6 500
Category 7 600
Category 7 1 000

These cables can be used for various communication channels which use as many as four

pairs simultaneously. In this sense, this document provides the cable characteristics required

by system developers to evaluate new systems.

The cables covered by this document are intended to operate with voltages and currents

normally encountered in communication systems. While these cables are not intended to be

used in conjunction with low impedance sources, for example the electric power supplies of

public utility mains, they are intended to be used to support the delivery of low voltage remote

powering applications such as IEEE 802.3af (Power over Ethernet) or further developments

for example according to IEEE 802.3at or IEEE 802.3bt. More information on the capacity to

support these applications according to the installation practices are given in IEC 61156-1-4,

IEC TR 61156-1-6 and ISO/IEC TS 29125.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 61156-1:2007, Multicore and symmetrical pair/quad cables for digital communications –

Part 1: Generic specification
IEC 61156-1:2007/AMD1:2009
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– 8 – IEC 61156-5:2020 © IEC 2020

IEC 62153-4-3, Metallic communication cables test methods – Part 4-3: Electromagnetic

compatibility (EMC) – Surface transfer impedance – Triaxial method

IEC 62153-4-5, Metallic communication cables test methods – Part 4-5: Electromagnetic

compatibility (EMC) – Coupling or screening attenuation – Absorbing clamp method

IEC 62153-4-9, Metallic communication cable test methods – Part 4-9: Electromagnetic

compatibility (EMC) – Coupling attenuation of screened balanced cables, triaxial method

3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61156-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Installation considerations
4.1 General remarks
Installation considerations are defined in IEC 61156-1:2007, Clause 4.
4.2 Bending radius of installed cable

The bending radius of the installed cable shall not be less than four times the outside

diameter of the cable.
4.3 Climatic conditions

Under static conditions, the cable shall operate at least in the temperature range of the

environment from –20 °C to +60 °C.

The attenuation increase due to the elevated operating temperature (temperature of the

environment) is described in 6.3.3.3.

In the case of application of remote powering, the maximum temperature of the conductor

shall not exceed the maximum operation temperature under static conditions in order to

maintain the integrity of the dielectric material performance which is aligned to the

environmental temperature range.

Extended temperature ranges are permitted and may be specified in the relevant detail

specification.
5 Materials and cable construction
5.1 General remarks

The choice of materials and cable construction shall be suitable for the intended application

and installation of the cable. Particular care shall be taken to meet any requirements for EMC

and fire performance (such as burning properties, smoke generation, evolution of halogen

gas).
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IEC 61156-5:2020 © IEC 2020 – 9 –

The cable construction shall be in accordance with the details and dimensions given in the

relevant detail specification.
5.2 Cable construction
5.2.1 Conductor
The conductor shall be a solid annealed copper conductor, in accordance with

IEC 61156-1:2007, 5.2.1 and should have a nominal diameter between 0,4 mm and 0,65 mm.

A conductor diameter of up to 0,8 mm may be used.
5.2.2 Insulation

The conductor shall be insulated with a suitable material. Examples of suitable materials are:

– polyolefin;
– fluoropolymer;
– low-smoke zero-halogen thermoplastic material.
5.2.3 Cable element
5.2.3.1 General
The cable element shall be a twisted pair or quad.
5.2.3.2 Screening of the cable element
When required, the screen for the cable element shall be in accordance with
IEC 61156-1:2007, 5.2.3.2.
5.2.4 Cable make-up

A spacer may be used to separate the cable elements. The cable elements, including spacers,

shall be assembled to form the cable core.

The core of the cable may be wrapped with a protective layer of non-hygroscopic and non-

wicking material.
5.2.5 Screening of the cable core

When required by the relevant detail specification, a screen for the cable core shall be

provided.
The screen shall be in accordance with IEC 61156-1:2007, 5.2.5.
5.2.6 Sheath
The sheath material shall consist of a suitable material.
Examples of suitable materials are:
– polyolefin;
– PVC;
– fluoropolymer;
– low-smoke zero-halogen thermoplastic material.
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– 10 – IEC 61156-5:2020 © IEC 2020

The sheath shall be continuous, having a thickness as uniform as possible. A non-metallic

ripcord may be provided. When provided, the ripcord shall be non-hygroscopic and non-

wicking.

The colour of the sheath is not specified but should be specified in the relevant detail

specification.
5.2.7 Identification

Each length of cable shall be identified with the supplier's details, and when required, by

means of a traceability code, using one of the following methods:
a) appropriately coloured threads or tapes;
b) with a printed tape;
c) printing on the cable core wrapping;
d) marking on the sheath.

Additional markings, such as length marking are permitted. If used, such markings should be

indicated in the relevant detail specification.
5.2.8 Finished cable
The finished cable shall be adequately protected for storage and shipment.
6 Characteristics and requirements
6.1 General remarks

Clause 6 lists the characteristics and minimum requirements of a cable complying with this

document. Test methods shall be in accordance with IEC 61156-1:2007 and
IEC 61156-1:2007/AMD1:2009, Clause 6.

The tests according to 6.2 shall be carried out on a cable length of not less than 100 m,

unless otherwise specified.

All the tests according to 6.3 shall be carried out on a cable length of 100 m, unless otherwise

specified. If suitable, respective lengths correction formulas according to IEC 61156-1 shall

be used. For Category 7 , unless the test is performed with very sensitive test equipment, it is

recommended to limit the cable length to 50 m for a better accuracy in high frequencies.

In case balunless measurements are made, the procedures should be as per

IEC TR 61156-1-2:2009 and IEC TR 61156-1-2:2009/AMD1:2014 which covers the application

of balunless measurement technology.
6.2 Electrical characteristics and tests
6.2.1 Conductor resistance

The maximum conductor resistance at or corrected to 20 °C shall not exceed 9,5 Ω for 100 m

of cable.
6.2.2 Resistance unbalance
6.2.2.1 Resistance unbalance within a pair
The resistance unbalance shall not exceed 2,0 %.
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IEC 61156-5:2020 © IEC 2020 – 11 –
6.2.2.2 Resistance unbalance between pairs
The pair-to-pair resistance unbalance shall not exceed 5,0 %.
6.2.3 Dielectric strength

There shall be no failures when a test is performed on a conductor/conductor and, where

screen(s) are present, on a conductor/screen with 1,0 kV DC for 1 min or, alternately, with

2,5 kV DC for 2 s. An AC voltage may be used. The AC voltage levels in these cases shall be

0,7 kV AC for 1 min or, alternately, 1,7 kV AC for 2 s.
6.2.4 Insulation resistance
The test shall be performed both on
– conductor/conductor;
– conductor/screen (when present).
The minimum insulation resistance at or corrected to 20 °C shall be not less
than 5 000 MΩ · km.
6.2.5 Mutual capacitance

The mutual capacitance is not specified but may be indicated in the relevant detail

specification.
6.2.6 Capacitance unbalance

The maximum capacitance unbalance pair to ground shall not exceed 1 600 pF/km at a

frequency of 800 Hz
...

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