SIST EN IEC 60794-1-126:2026
(Main)Optical fibre cables - Part 1-126: Generic specification - Basic optical cable test procedures - Mechanical tests methods - Galloping, Method E26 (IEC 60794-1-126:2026)
- Abstract
IEC 60794-1-126:2026 defines the test procedures used to establish uniform requirements for mechanical performance - galloping. It applies to optical fibre cables like ADSS, OPGW or OPPC that can be exposed to galloping phenomena. See IEC 60794-1-2 for general requirements and definitions and for a complete reference guide to test methods of all types. This first edition cancels and replaces Method E26 of the first edition of IEC 60794‑1‑21 published in 2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Addition of "for ADSS" and "for OPGW and OPPC" in 4.7, a);
b) Addition of "L4" in Figure 1 and in 4.7, b);
c) Change of the specified static sag angle to ≤ 1,5±0,5°;
d) Improvement of Figure 1;
- Status
- Published
- Public Enquiry End Date
- 30-Apr-2025
- Publication Date
- 22-Jun-2026
- Technical Committee
- MOC - Mobile Communications
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 16-Jun-2026
- Due Date
- 21-Aug-2026
- Completion Date
- 23-Jun-2026
SIST EN IEC 60794-1-126:2026 is the Slovenian adoption of EN IEC 60794-1-126:2026, based on IEC 60794-1-126:2026 without modification. It specifies Method E26 for galloping tests on optical fibre cables, so users can assess how cables such as ADSS, OPGW and OPPC behave under dynamic mechanical stress and how that stress affects attenuation. Engineers, test laboratories, manufacturers and buyers use it when they need a common test procedure for aerial cable performance.
What does SIST EN IEC 60794-1-126:2026 specify?
SIST EN IEC 60794-1-126:2026 defines a mechanical test procedure for galloping performance in optical fibre cables exposed to galloping phenomena. The method is aimed at aerial cables and their support hardware, and it is tied to optical monitoring during the mechanical test.
The document is organized into four clauses:
- Clause 1 - Scope
- Clause 2 - Normative references
- Clause 3 - Terms and definitions
- Clause 4 - Method E26: Galloping
Clause 4 is split into object, sample, apparatus, procedure, loading criteria, requirements, details to be specified, and details to be reported. The document also includes Figure 1 for the test set-up, Table 1 for test values, the Bibliography, and Annex ZA with the European normative references.
What are the key requirements of SIST EN IEC 60794-1-126:2026?
SIST EN IEC 60794-1-126:2026 sets out how to load a cable, excite it, monitor attenuation, and judge the result. In practice, it tells a test lab what sample length, tension, motion and reporting data are needed to simulate galloping in a repeatable way.
Sample and test arrangement
Clause 4.2 requires the sample to be long enough for optical access outside the tensioning points, and the fibre ends must be terminated before tensioning so the fibres cannot move axially within the loaded length. At least one fibre from each buffer tube, fibre bundle, or unit is to be measured. This matters because the optical reading has to represent the cable while the mechanical loading is applied.
Clause 4.3 describes a set-up with end fixtures, a suspended active span, a calibrated tension-measuring device, and an electronically controlled shaker. The fixed length L1 is at least 30 m, and the static sag angle to horizontal is controlled to 1,5 ± 0,5°. The test rig therefore has to reproduce a stable galloping condition rather than a random vibration.
Loading and cycling
Clause 4.4 requires at least 100 000 galloping cycles at the single-loop resonant frequency. Table 1 gives the target relationships for L1, L2, L3 and the loop length L4, including the antinode amplitude relative to loop length. In practice, the test must run long enough to build fatigue damage and reveal changes in the cable or fibres.
Clause 4.5 sets the tensioning approach. For OPGW and OPPC, the cable should be tensioned to 5 % of maximum allowable tension (MAT), and for ADSS to 50 % of maximum installation tension (MIT), with lower values allowed when the gauge length makes that necessary. This gives the lab a starting point for loading, but the final rig tension has to suit the actual test geometry.
Optical monitoring and pass-fail checks
Clause 4.5 also requires continuous monitoring of attenuation in accordance with IEC 60793-1-46. Attenuation is to be recorded at least every 2 000 cycles, with a final measurement after the 100 000 cycles and at least 2 h stabilisation. This means the test checks both live optical behavior during galloping and the final post-test condition.
Clause 4.6 requires no visible cracks or openings on the cable elements, and the maximum change in attenuation must stay within the relevant specification. Clause 4.7 says the relevant specification has to state MIT for ADSS or MAT for OPGW and OPPC, the loop length L4 before and after the test, and the allowable attenuation change. Clause 4.8 lists the information to report, including span lengths, installation tension, resonant frequency, cycle count, attenuation change and physical damage.
What terms does SIST EN IEC 60794-1-126:2026 define?
SIST EN IEC 60794-1-126:2026 uses the terms and definitions from IEC 60794-1-1. The most important document-specific terms are the cable types and test-length identifiers used in Method E26.
- ADSS - the cable type for which the document links loading to MIT.
- OPGW - one of the cable types covered by the galloping method and linked to MAT.
- OPPC - another covered cable type, also linked to MAT.
- MIT - maximum installation tension, used in the document to set loading for ADSS.
- MAT - maximum allowable tension, used in the document to set loading for OPGW and OPPC.
- L1 - the fixed length of the test span.
- L2 - the active span subjected to galloping.
- L3 - the passive span used in the test arrangement.
- L4 - the loop length before and after the test.
Who uses SIST EN IEC 60794-1-126:2026?
SIST EN IEC 60794-1-126:2026 is used by laboratories that perform mechanical and optical testing on aerial optical fibre cables. It is also relevant to cable manufacturers and specifiers who need to define galloping performance for ADSS, OPGW and OPPC.
It is especially useful for teams that must write a product specification, set up a test rig, monitor attenuation during dynamic loading, or compare results between suppliers. Buyers and quality managers use it when they need a common acceptance test for cable behavior in icing or wet-snow conditions.
What changed in SIST EN IEC 60794-1-126:2026 from the previous edition?
SIST EN IEC 60794-1-126:2026 cancels and replaces Method E26 of IEC 60794-1-21:2015, and it is described as a technical revision. The stated changes are:
- addition of "for ADSS" and "for OPGW and OPPC" in 4.7 a)
- addition of "L4" in Figure 1 and in 4.7 b)
- change of the specified static sag angle to 1,5 ± 0,5°
- improvement of Figure 1
Which standards are used with SIST EN IEC 60794-1-126:2026?
SIST EN IEC 60794-1-126:2026 uses IEC 60794-1-1 for generic specification terms and definitions. It uses IEC 60793-1-46 for the attenuation monitoring method during the test.
IEC 60794-1-2 is cited as the general guidance document and the complete reference guide to test methods in the IEC 60794 series. Annex ZA also maps the international publications to their European publications for use in the EN system.
What does the SIST EN IEC 60794-1-126:2026 document contain?
The document contains the galloping test set-up in Figure 1 and the cable galloping test values in Table 1. These two items support test-rig design and help labs choose the correct span lengths, amplitude relation and loading conditions.
It also contains a stepwise procedure for sample preparation, excitation, cycle counting, attenuation monitoring and final inspection. That makes it suitable for testing, specification writing and technical comparison of cable performance under galloping conditions.
Relations
- Effective Date
- 01-Sep-2026
- Effective Date
- 01-Sep-2026
- Effective Date
- 26-May-2026
- Effective Date
- 26-May-2026
- Effective Date
- 16-Jun-2026
- Effective Date
- 16-Jun-2026
- Effective Date
- 16-Jun-2026
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Frequently Asked Questions
SIST EN IEC 60794-1-126:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Optical fibre cables - Part 1-126: Generic specification - Basic optical cable test procedures - Mechanical tests methods - Galloping, Method E26 (IEC 60794-1-126:2026)". This standard covers: IEC 60794-1-126:2026 defines the test procedures used to establish uniform requirements for mechanical performance - galloping. It applies to optical fibre cables like ADSS, OPGW or OPPC that can be exposed to galloping phenomena. See IEC 60794-1-2 for general requirements and definitions and for a complete reference guide to test methods of all types. This first edition cancels and replaces Method E26 of the first edition of IEC 60794‑1‑21 published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Addition of "for ADSS" and "for OPGW and OPPC" in 4.7, a); b) Addition of "L4" in Figure 1 and in 4.7, b); c) Change of the specified static sag angle to ≤ 1,5±0,5°; d) Improvement of Figure 1;
IEC 60794-1-126:2026 defines the test procedures used to establish uniform requirements for mechanical performance - galloping. It applies to optical fibre cables like ADSS, OPGW or OPPC that can be exposed to galloping phenomena. See IEC 60794-1-2 for general requirements and definitions and for a complete reference guide to test methods of all types. This first edition cancels and replaces Method E26 of the first edition of IEC 60794‑1‑21 published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Addition of "for ADSS" and "for OPGW and OPPC" in 4.7, a); b) Addition of "L4" in Figure 1 and in 4.7, b); c) Change of the specified static sag angle to ≤ 1,5±0,5°; d) Improvement of Figure 1;
SIST EN IEC 60794-1-126:2026 is classified under the following ICS (International Classification for Standards) categories: 33.180.10 - Fibres and cables. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN IEC 60794-1-126:2026 has the following relationships with other standards: It is inter standard links to SIST EN 60794-1-21:2015, SIST EN 60794-1-21:2015/A1:2020, SIST EN IEC 60793-1-46:2024, SIST EN IEC 60794-1-1:2023, SIST EN IEC 62148-1:2018, SIST EN 3745-505:2018, SIST-TS CLC/TS 50621:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN IEC 60794-1-126:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2026
Nadomešča:
SIST EN 60794-1-21:2015
Optični kabli - 1-126. del: Splošna specifikacija - Osnovni preskusni postopki za
optične kable - Mehanske preskusne metode - Galopiranje, metoda E26 (IEC 60794
-1-126:2026)
Optical fibre cables - Part 1-126: Generic specification - Basic optical cable test
procedures - Mechanical tests methods - Galloping, Method E26 (IEC 60794-1-
126:2026)
Lichtwellenleiterkabel – Teil 1-126: Fachgrundspezifikation - Grundlegende
Prüfverfahren für Lichtwellenleiterkabel - Mechanische Prüfverfahren - Galoppieren,
Verfahren E26 (IEC 60794-1-126:2026)
Câbles à fibres optiques - Partie 1-126: Spécification générique - Procédures
fondamentales d’essais des câbles optiques - Méthodes d’essais mécaniques - Galop,
Méthode E26 (IEC 60794-1-126:2026)
Ta slovenski standard je istoveten z: EN IEC 60794-1-126:2026
ICS:
33.180.10 (Optična) vlakna in kabli Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60794-1-126
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2026
ICS 33.180.10 Supersedes EN 60794-1-21:2015 (partially); EN 60794-1-
21:2015/A1:2020 (partially)
English Version
Optical fibre cables - Part 1-126: Generic specification - Basic
optical cable test procedures - Mechanical tests methods -
Galloping, Method E26
(IEC 60794-1-126:2026)
Câbles à fibres optiques - Partie 1-126: Spécification Lichtwellenleiterkabel - Teil 1-126: Fachgrundspezifikation -
générique - Procédures fondamentales d'essais des câbles Grundlegende Prüfverfahren für Lichtwellenleiterkabel -
optiques - Méthodes d'essais mécaniques - Galop, Mechanische Prüfverfahren - Galoppieren, Verfahren E26
Méthode E26 (IEC 60794-1-126:2026)
(IEC 60794-1-126:2026)
This European Standard was approved by CENELEC on 2026-05-27. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60794-1-126:2026 E
European foreword
The text of document 86A/2653/FDIS, future edition 1 of IEC 60794-1-126, prepared by SC 86A
"Fibres and cables" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 60794-1-126:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-06-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-06-30
document have to be withdrawn
This document partially supersedes EN 60794-1-21 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60794-1-126:2026 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60794-1-2 NOTE Approved as EN IEC 60794-1-2
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60794-1-1 - Optical fibre cables - Part 1-1: Generic EN IEC 60794-1-1 -
specification - General
IEC 60793-1-46 - Optical fibres - Part 1-46: Measurement EN IEC 60793-1-46 -
methods and test procedures - Monitoring of
changes in attenuation
IEC 60794-1-126 ®
Edition 1.0 2026-04
INTERNATIONAL
STANDARD
Optical fibre cables -
Part 1-126: Generic specification - Basic optical cable test procedures -
Mechanical tests methods - Galloping, Method E26
ICS 33.180.10 ISBN 978-2-8327-1129-3
IEC 60794-1-126:2026-04(en)
IEC 60794-1-126:2026 © IEC 2026
CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Method E26: Galloping . 5
4.1 Object . 5
4.2 Sample . 5
4.3 Apparatus . 6
4.4 Procedure . 6
4.5 Loading criteria . 6
4.6 Requirements . 7
4.7 Details to be specified . 7
4.8 Details to be reported . 7
Bibliography . 9
Figure 1 – Cable galloping test set-up . 7
Table 1 – Test values for cable galloping test . 8
IEC 60794-1-126:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Optical fibre cables -
Part 1-126: Generic specification - Basic optical cable test procedures -
Mechanical tests methods - Galloping, Method E26
FOREWORD
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