IEC TR 61156-1-6:2016

Multicore and symmetrical pair/quad cables for digital communications - Part 1-6: Nominal DC-resistance values of floor-wiring and work-area cables for digital communications

IEC TR 61156-1-6:2016(E), which is a Technical Report, provides informative values for DC-resistance of typical installed cables at the time of publication to enable further analysis of cable performance mainly influenced by DC-resistance, such as thermal heating.

General Information

• Status: Published
• Publication Date: 05-Sep-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.120.20 - Wires and symmetrical cables
• Technical Committee: SC 46C - Wires and symmetric cables
• Current Stage: PPUB - Publication issued
• Start Date: 31-Dec-2016
• Completion Date: 06-Sep-2016

Standards Content (Sample)

IEC TR 61156-1-6 ®
Edition 1.0 2016-09
TECHNICAL
REPORT
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –
Part 1-6: Nominal DC-resistance values of floor-wiring and work-area cables for
digital communications
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IEC TR 61156-1-6 ®
Edition 1.0 2016-09
TECHNICAL
REPORT
colour
inside
Multicore and symmetrical pair/quad cables for digital communications –

Part 1-6: Nominal DC-resistance values of floor-wiring and work-area cables for

digital communications
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-3630-7

– 2 – IEC TR 61156-1-6:2016 © IEC 2016
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 Terms and definitions . 5
4 Overview . 5
5 DC-resistance values . 6
5.1 General . 6
5.2 Values for horizontal floor wiring cables . 6
5.3 Values for work area wiring cables . 7
5.4 Resistance unbalance . 8
Bibliography . 11

Figure 1 – Evaluation of resistance unbalance between pairs for certain stranding
diameters and lay lengths ranges . 9
Figure 2 – Evaluation of resistance unbalance between pairs taking into account a
resistance unbalance of the pairs of 2 % . 10

Table 1 – Nominal conductor-diameter (range) and conductor-resistance (typical)
values for horizontal floor wiring cables . 7
Table 2 – Nominal conductor-diameter (range) and conductor-resistance (typical)
values for work area wiring cables . 8
Table 3 – Nominal (typical) values of resistance unbalance between pairs for
horizontal floor wiring cables and work area wiring cable . 10

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTICORE AND SYMMETRICAL PAIR/QUAD
CABLES FOR DIGITAL COMMUNICATIONS –

Part 1-6: Nominal DC-resistance values of floor-wiring
and work-area cables for digital communications

FOREWORD
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The main task of IEC technical committees is to prepare International Standards. However, a
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data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC TR 61156-1-6, which is a technical report, 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.

– 4 – IEC TR 61156-1-6:2016 © IEC 2016
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
46C/1044/DTR 46C/1051/RVC
Full information on the voting for the approval of this technical report 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
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understanding of its contents. Users should therefore print this document using a
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MULTICORE AND SYMMETRICAL PAIR/QUAD
CABLES FOR DIGITAL COMMUNICATIONS –

Part 1-6: Nominal DC-resistance values of floor-wiring
and work-area cables for digital communications

1 Scope
This part of IEC 61156, which is a Technical Report, provides informative values for DC-
resistance of typical installed cables at the time of publication to enable further analysis of
cable performance mainly influenced by DC-resistance, such as thermal heating.
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
IEC 61156-5, 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 61156-6, 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 61156-9, Multicore and symmetrical pair/quad cables for digital communications – Part 9:
Cables for channels with transmission characteristics up to 2 GHz– Sectional specification
IEC 61156-10, Multicore and symmetrical pair/quad cables for digital communications –
Part 10: Cables for cords with transmission characteristics up to 2 GHz– Sectional
specification
3 Terms and definitions
No terms and definitions are listed in this document.
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 Overview
Measurement of thermal heating /1/ or other analysis of applications such as POE /2/ or other
remote powering application requires DC-resistance values reflecting the higher performance
of higher categories not explicitly specified in IEC 61156-5, IEC 61156-6, IEC 61156-9 and

– 6 – IEC TR 61156-1-6:2016 © IEC 2016
IEC 61156-10. This document therefore informatively provides such values for horizontal floor
wiring and work area wiring taking into account different possible basic designs.
5 DC-resistance values
5.1 General
IEC 61156-5, IEC 61156-6, IEC 61156-9 and IEC 61156-10 only have a basic DC-resistance
requirement each, possible to be fulfilled by cables of the lowest category. As higher
categories provide a better attenuation, also the DC-resistance of such a cable is lower, even
though not required, as cabling standards also do not require more severe values for higher
Classes /3/.
The DC-resistance of a balanced pair is basically dependent on conductivity and diameter of
the wires. During the stranding process
...