IEC 60794-1-208:2025

IEC 60794-1-208 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 1-208: Generic specification – Basic optical cable test procedures –
Environmental test methods – Pneumatic resistance, Method F8

Câbles à fibres optiques –
Partie 1-208: Spécification générique – Procédures fondamentales d’essais des
câbles optiques – Méthodes d’essais d'environnement – Résistance
pneumatique, Méthode F8
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IEC 60794-1-208 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 1-208: Generic specification – Basic optical cable test procedures –

Environmental test methods – Pneumatic resistance, Method F8

Câbles à fibres optiques –
Partie 1-208: Spécification générique – Procédures fondamentales d’essais des

câbles optiques – Méthodes d’essais d'environnement – Résistance

pneumatique, Méthode F8
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10  ISBN 978-2-8327-0360-1

– 2 – IEC 60794-1-208:2025 © IEC 2025
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements. 6
5 Method F8: Pneumatic resistance . 6
5.1 Object . 6
5.2 Sample . 7
5.3 Apparatus . 7
5.4 Procedure . 7
5.5 Requirements . 7
5.6 Details to be specified . 7
5.7 Details to be reported . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 1-208: Generic specification – Basic optical cable test procedures –
Environmental test methods – Pneumatic resistance, Method F8

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
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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
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60794-1-208 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical
committee 86: Fibre optics. It is an International Standard.
This first edition of IEC 60794-1-208 cancels and replaces method F8 of the second edition of
IEC 60794-1-22 published in 2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the form of the formula for pneumatic resistance is modified for ease of calculation with test
pressures other than 62 kPa;
b) details to be reported are added.

– 4 – IEC 60794-1-208:2025 © IEC 2025
The text of this International Standard is based on the following documents:
Draft Report on voting
86A/2539/FDIS 86A/2556/RVD
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 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, or
• revised.
INTRODUCTION
The environmental test contained in IEC 60794-1-22: 2017 will now be individually numbered
in the IEC 60794-1-2xx 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.
– 6 – IEC 60794-1-208:2025 © IEC 2025
OPTICAL FIBRE CABLES –
Part 1-208: Generic specification – Basic optical cable test procedures –
Environmental test methods – Pneumatic resistance, Method F8

1 Scope
This part of IEC 60794 describes test procedures to be used in establishing uniform
requirements for optical fibre cables for the pneumatic resistance environmental property, for
unfilled cables which are protected by gas pressurization.
This document applies to optical fibre cables for use with telecommunication equipment and
devices employing similar techniques, and to cables having a combination of both optical fibres
and electrical conductors.
NOTE Throughout the document, the wording "optical cable" can also include optical fibre units, microduct fibre
units, etc.
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 guidance to test methods of all types. It shall be considered for
general requirements and definitions.
5 Method F8: Pneumatic resistance
5.1 Object
This test applies only to unfilled cables which are protected by gas pressurization. The purpose
is to measure the pneumatic resistance to gas flow of such cables. The pneumatic resistance
of pressurized cables is required to ensure adequate functioning of the gas pressurization
process and syste
...