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IEC 60794-1-31
Edition 2.0 2021-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibre cables –
Part 1-31: Generic specification – Optical cable elements – Optical fibre ribbon
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IEC 60794-1-31
Edition 2.0 2021-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibre cables –
Part 1-31: Generic specification – Optical cable elements – Optical fibre ribbon
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10; 33.180.99 ISBN 978-2-8322-9975-3
– 2 – IEC 60794-1-31:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions, symbols and abbreviated terms . 6
4 Requirements . 6
4.1 General . 6
4.2 Construction . 6
4.2.1 Ribbon structure . 6
4.2.2 Optical fibres . 7
4.3 Dimensions . 7
4.4 Mechanical requirements . 10
4.4.1 General . 10
4.4.2 Separability of individual fibres from a ribbon . 11
4.4.3 Ribbon stripping . 11
4.4.4 Torsion . 11
4.5 Identification of the ribbon . 11
Annex A (informative) Fibre identification . 12
A.1 Identification by positional identification . 12
A.2 Identification by ribbon coding and fibre colouring . 13
Bibliography . 14
Figure 1 – Cross-section of a typical edge-bonded ribbon (thinner ribbon) . 6
Figure 2 – Cross-section of a typical encapsulated ribbon (thicker ribbon) . 7
Figure 3 – Overview of a typical partially-bonded ribbon . 7
Figure 4 – Example of cross-sectional drawing illustrating fibre ribbon geometry (four-
fibre ribbon) . 10
Figure A.1 – Example of identification by means of colour coding and positioning . 13
Table 1 – Maximum dimensions of optical fibre ribbons for typical 250 µm coating
diameter fibre . 8
Table 2 – Maximum dimensions of optical fibre ribbons for typical 200 µm coating
diameter fibre . 9
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 1-31: Generic specification – Optical cable elements –
Optical fibre ribbon
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
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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.
This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 60794-1-31:2018. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
– 4 – IEC 60794-1-31:2021 RLV © IEC 2021
IEC 60794-1-31 has been prepared by subcommittee SC86A: Fibres and cables, of IEC
technical committee 86: Fibre optics. It is an International Standard.
This second edition cancels and replaces the first edition published in 2018. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The geometrical requirements for optical fibre ribbon with typically 250 µm coating diameter
have been modified and those for the optical fibre ribbon with typically 200 µm coating
diameter have been added.
b) "Identification by positional identification" and "Identification by ribbon coding and fibre
colouring" are moved to a new informative Annex A.
The text of this International Standard is based on the following documents:
CDV Report on voting
86A/2071/CDV 86A/2109/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at /members_experts/refdocs. The main document types developed by IEC are
described in greater detail at /standardsdev/publications.
A list of all parts in the IEC 60794 series, published under the general title Optical fibre cables,
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 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.
IMPORTANT – The "colour inside" logo on the cover page of this document 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.
OPTICAL FIBRE CABLES –
Part 1-31: Generic specification – Optical cable elements –
Optical fibre ribbon
1 Scope
This part of IEC 60794, which is a generic specification, covers optical fibre ribbons.
Requirements which are described in this part apply to optical fibre ribbon cables for use with
telecommunication equipment and devices employing similar techniques, in particular optical
fibre cables in IEC 60794-2 for indoor use, in IEC 60794-3 for outdoor use, in IEC 60794-4 for
self-supporting overhead use, in IEC 60794-5 for air blown use and in IEC 60794-3 IEC 60794-
6 for indoor/outdoor use. The detailed specification can be verified in specifications for each
application are given in such as IEC 60794-2 and IEC 60794-3.
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 60304, Standard colours for insulation for low-frequency cables and wires
IEC 60793-2-10, Optical fibres – Part 2-10: Product specifications – Sectional specification for
category A1 multimode fibres
IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for
class B single-mode fibres
IEC 60794-1-1, Optical fibre cables – Part 1-1: Generic specification – General
IEC 60794-1-23, Optical fibre cables – Part 1-23: Generic specification – Basic optical cable
test procedures – Cable element test methods
IEC 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification
IEC 60794-3, Optical fibre cables – Part 3: Outdoor cables – Sectional specification
IEC 60794-4, Optical fibre cables – Part 4: Sectional specification – Aerial optical cables along
electrical power lines
IEC 60794-5, Optical fibre cables – Part 5: Sectional speci
...