IEC 61156-1-4:2018
(Main)Multicore and symmetrical pair/quad cables for digital communications - Part 1-4: Assessment of conductor heating in bundled cables due to the deployment of remote powering
Multicore and symmetrical pair/quad cables for digital communications - Part 1-4: Assessment of conductor heating in bundled cables due to the deployment of remote powering
IEC 61156-1-4:2018 specifies a method to assess the thermal behaviour of cables arranged in bundles, for digital communications. A method is described to determine the temperature increase in cable bundles for certain remote powering currents as a basis to analyse the expected performance under several test arrangements described in standards dealing with the installation of cabling systems.
It is only intended to provide guidance to assess the thermal behaviour of cables for digital communications in reference environmental conditions and arrangements. It is therefore not intended to become a type of test method.
This first edition cancels and replaces IEC PAS 61156-1-4, published in 2010. This edition includes the following significant technical changes with respect to the previous edition:
a) Several test arrangements are considered;
b) The mathematical approach was revised.
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IEC 61156-1-4 ®
Edition 1.0 2018-10
INTERNATIONAL
STANDARD
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 1-4: Assessment of conductor heating in bundled cables due to the
deployment of remote powering
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IEC 61156-1-4 ®
Edition 1.0 2018-10
INTERNATIONAL
STANDARD
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 1-4: Assessment of conductor heating in bundled cables due to the
deployment of remote powering
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-5968-9
– 2 – IEC 61156-1-4:2018 © IEC 2018
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and symbols. 6
3.1 Terms and definitions . 6
3.2 Symbols . 7
4 Testing procedure . 8
4.1 General . 8
4.2 Bundling of cables . 8
4.3 Testing current and measurement accuracy . 10
4.4 Test conditions . 10
4.5 Environmental conditions . 10
4.6 Assessment of the concatenated loop resistance of all pairs . 13
4.7 Data submission . 13
4.8 Expression of results . 14
Annex A (informative) Modelling of cable bundle heating [3] . 15
A.1 Cable heating model . 15
A.2 Evaluation of recorded data . 18
Bibliography . 19
Figure 1 – Bundle of cables under test . 9
Figure 2 – Thermocouple placement . 9
Figure 3 – Free air . 11
Figure 4 – Open conduit (Tray) . 11
Figure 5 – Conduit . 12
Figure 6 – Sealed conduit . 13
Table 1 – Supporting information . 14
Table 2 – Test data format . 14
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 1-4: Assessment of conductor heating in bundled cables
due to the deployment of remote powering
FOREWORD
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International Standard IEC 61156-1-4 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 first edition cancels and replaces IEC PAS 61156-1-4, published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Several test arrangements are considered;
b) The mathematical approach was revised
The text of this document is based on the following documents:
– 4 – IEC 61156-1-4:2018 © IEC 2018
CDV Report on voting
46C/1089/CDV 46C/1098A/RVC
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.
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.
A bilingual version of this publication may be issued at a later date.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
INTRODUCTION
The use of remote powering causes a temperature rise in cables installed in bundles.
This document specifies a method to assess the temperature increase in cable bundles by
measuring the temperature change using thermocouples placed on the sheath of the cable at
the centre of the bundle.
Several test arrangements are considered as well as current values.
– 6 – IEC 61156-1-4:2018 © IEC 2018
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES
FOR DIGITAL COMMUNICATIONS –
Part 1-4: Assessment of conductor heating in bundled cables
due to the deployment of remote powering
1 Scope
This document specifies a method to assess the thermal behaviour of cables arranged in
bundles, for digital communications. A method is described to determine the temperature
increase in cable bundles for certain remote powering currents as a basis to analyse the
expected performance under several test arrangements described in standards dealing with
the installation of cabling systems (e.g. [1] , [2]).
It is only intended to provide guidance to assess the thermal behaviour of cables for digital
communications in reference environmental conditions and arrangements. It is therefore not
intended to become a type of test method.
The following test arrangements are considered:
c) free air;
d) cable tray;
e) conduits;
f) conduit with sealed ends.
Even though this document covers four-pair data grade cables, the same principles can be
applied to other cable types.
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, Multicore and symmetrical pair/quad cables for digital communications – Part 1:
Generic specification
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this
...
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