IEC 60794-1-308:2023

IEC 60794-1-308
®

Edition 1.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Optical fibre cables –
Part 1-308: Generic specification – Basic optical cable test procedures – Cable
element test methods – Ribbon residual twist test, method G8

Câbles à fibres optiques –
Partie 1-308: Spécification générique – Procédures fondamentales d'essais des
câbles optiques – Méthodes d'essais des éléments de câbles – Essai de torsion
résiduelle du ruban, méthode G8

IEC 60794-1-308:2023-02(en-fr)

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IEC 60794-1-308

®


Edition 1.0 2023-02




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Optical fibre cables –

Part 1-308: Generic specification – Basic optical cable test procedures – Cable

element test methods – Ribbon residual twist test, method G8



Câbles à fibres optiques –

Partie 1-308: Spécification générique – Procédures fondamentales d'essais des


câbles optiques – Méthodes d'essais des éléments de câbles – Essai de torsion

résiduelle du ruban, méthode G8












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.180.10 ISBN 978-2-8322-6471-3




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

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 60794-1-308:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 6
5 Sample . 7
6 Apparatus . 7
7 Procedure . 7
8 Requirements . 8
9 Details to be specified . 8
Bibliography . 9

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IEC 60794-1-308:2023 © IEC 2023 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

OPTICAL FIBRE CABLES –

Part 1-308: Generic specification – Basic optical cable test procedures –
Cable element test methods – Ribbon residual twist test, method G8

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.
IEC 60794-1-308 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical
committee 86: Fibre optics. It is an International Standard.
This document partially cancels and replaces IEC 60794-1-23:2019.
This edition includes the following significant technical change with respect to
IEC 60794-1-23:2019: mention in Clause 1 that this test is not applicable to partially-bonded
ribbons.
The text of this International Standard is based on the following documents:
Draft Report on voting
86A/2272/FDIS 86A/2297/RVD

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.

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– 4 – IEC 60794-1-308:2023 © IEC 2023
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 www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/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.

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IEC 60794-1-308:2023 © IEC 2023 – 5 –
INTRODUCTION
This document contains method G8 of IEC 60794-1-23:2019, which will be withdrawn. The
system for optical fibre test methods have been restructured and renumbered. The optical cable
element test methods contained in IEC 60794-1-23:2019 will now be individually numbered in
the IEC 60794-1-3xx series. Each test method is now considered to be an individual document
rather than part of a multi-test method compendium. Full cross-reference details are given in
IEC 60794-1-2.

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– 6 – IEC 60794-1-308:2023 © IEC 2023
OPTICAL FIBRE CABLES –

Part 1-308: Generic specification – Basic optical cable test procedures –
Cable element test methods – Ribbon residual twist test, method G8



1 Scope
This part of IEC 60794 describes test procedures to evaluate the degree of permanent twist in
an uncabled ribbon or in a cabled optical fibre ribbon.
This document applies to optical fibre ribbons in optical cables for use with telecommunication
equipment and devices employing similar techniques, and to optical fibre ribbons in cables
having a combination of both optical fibres and electrical conductors.
This document is not applicable to partially-bonded ribbons. The method for partially-bonded
ribbons is under consideration.
Throughout the document, the wording "optical cable" can also include optical fibre units,
microduct fibre units, etc.
NOTE The environmental testing of optical fibre ribbon would be valuable for some applications. Useful information
about suitable test methods can be found in the optical fibre standards IEC 60793-1-50, IEC 60793-1-51,
IEC 60793‑1‑52, and IEC 60793-1-53.
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 60794-1-2, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test
procedures – General guidance
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 General requirements
IEC 60794-1-2 is the reference guide to test methods of all types. It shall be considered for
general requirements and definitions.

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IEC 60794-1-308:2023 © IEC 2023 – 7 –
5 Sample
To evaluate the degree of permanent twist in a cabled ribbon, ribbon samples shall be taken
from a preconditioned (aged) test cable.
To evaluate the degree of permanent twist in an uncabled ribbon, ribbon samples shall be taken
from a preconditioned (aged) test uncabled ribbon.
The samples shall be of a length sufficient to include the gauge length of 50 cm and additional
length on each end to facilitate attachment of clamps and the test weight.
6 Apparatus
The apparatus shall be constructed to have the following characteristics.
– The ribbon shall hang vertically, clamped at the top, with the bottom end free to rotate and
translate as necessary.
– A mass shall be attached to the bottom end of the ribbon sample, with the gauge length
situated between the top clamp and the bottom mass.
– The bottom mass shall be arranged so that it does not impart any twisting or side loading of
the ribbon.
– The gauge length shall be 50 cm ± 5 cm, unless otherwise specified.
– The mass shall be 100 g ± 5 g, unless otherwise specified.
– A method shall be provided to measure the
...