EN IEC 60794-1-131:2026
(Main)Optical fibre cables - Part 1-131: Generic specification - Basic optical cable test procedures - Mechanical tests methods - Microduct inner clearance test, Method E31
Optical fibre cables - Part 1-131: Generic specification - Basic optical cable test procedures - Mechanical tests methods - Microduct inner clearance test, Method E31
IEC 60794-1-131:2026 describes the test procedures used to establish uniform requirements for microduct used to install optical fibre cables by blowing technique for the mechanical property - microduct inner clearance test. This document applies to microduct for use in optical fibre cable installation by blowing. NOTE Throughout the document, the wording “optical cable” can also include optical fibre units, microduct fibre units, etc. This first edition cancels and replaces Method E31 of the first edition of IEC 60794-1-21 published in 2015, Amendment 1:2020. This edition constitutes a technical revision. edition includes the significant technical changes with respect to IEC 60794‑1‑21:2015/AMD1:2020: a) Specification of Method E31.
Lichtwellenleiterkabel - Teil 1-131: Fachgrundspezifikation - Grundlegende Prüfverfahren für Lichtwellenleiterkabel - Mechanische Prüfverfahren - Prüfung des Durchgangs von Mikrorohren, Verfahren E31
Câbles à fibres optiques - Partie 1-131: Spécification générique - Procédures fondamentales d’essais des câbles optiques - Méthodes d’essais mécaniques - Essai de jeu interne du microconduit, Méthode E31
IEC 60794-1-131:2026 décrit les procédures d’essai utilisées pour établir des exigences uniformes relatives aux microconduits utilisés pour l’installation de câbles à fibres optiques par la technique de soufflage, pour l’essai de propriété mécanique concernant le jeu interne du microconduit. Le présent document s’applique aux microconduits utilisés pour l’installation de câbles à fibres optiques par soufflage. NOTE Tout au long du présent document, l’expression "câble optique" peut également inclure des unités de fibres optiques, des unités de fibres pour microconduits, etc. Cette première édition annule et remplace la Méthode E31 de la première édition de l’IEC 60794-1-21 parue en 2015, Amendement 1:2020. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) Spécification de la Méthode E31.
Optični kabli - 1-131. del: Splošna specifikacija - Osnovni preskusni postopki za optične kable - Mehanske preskusne metode - Preskus notranje zračnosti mikrocevovoda, metoda E31 (IEC 60794-1-131:2026)
IEC 60794-1-131:2026 opisuje preskusne postopke, ki se uporabljajo za vzpostavitev enotnih zahtev za mikrokanale, ki se uporabljajo za vgradnjo optičnih kablov s tehniko vpihovanja za mehansko lastnost - preskus notranje odprtosti mikrokanala. Ta dokument se uporablja za mikrokanale, namenjene vgradnji optičnih kablov z vpihovanjem.
OPOMBA V celotnem dokumentu lahko izraz "optični kabel" vključuje tudi enote optičnih vlaken, enote mikrokanalnih vlaken itd.
Ta prva izdaja razveljavlja in nadomešča Metodo E31 prve izdaje IEC 60794-1-21, objavljene leta 2015, Dopolnilo 1:2020. Ta izdaja predstavlja tehnično revizijo. Izdaja vključuje pomembne tehnične spremembe v primerjavi z IEC 60794-1-21:2015/AMD1:2020:
a) Specifikacija Metode E31.
General Information
- Status
- Published
- Publication Date
- 19-Feb-2026
- Technical Committee
- CLC/TC 86A - Optical fibres and optical fibre cables
- Current Stage
- 6060 - Document made available - Publishing
- Start Date
- 20-Feb-2026
- Due Date
- 27-Feb-2026
- Completion Date
- 20-Feb-2026
Relations
- Effective Date
- 09-Sep-2025
- Effective Date
- 09-Sep-2025
- Effective Date
- 03-Feb-2026
- Effective Date
- 20-Feb-2026
- Effective Date
- 20-Feb-2026
- Effective Date
- 20-Feb-2026
Overview
EN IEC 60794-1-131:2026, published by CLC, defines the uniform test procedure for the mechanical assessment of microduct inner clearance-an essential property for microducts used in the installation of optical fibre cables through blowing techniques. This standard ensures that microducts maintain adequate internal space post-manufacture and after exposure to mechanical or environmental stress. By establishing a consistent approach to the microduct inner clearance test (Method E31), the standard increases confidence in the suitability of microducts for high-performance optical cable deployments.
This first edition replaces Method E31 of IEC 60794-1-21:2015 and its 2020 amendment, restructuring and updating the requirements under the IEC 60794-1-1xx series for clearer, stand-alone method documentation.
Key Topics
- Microduct Inner Clearance Test: The core of EN IEC 60794-1-131:2026 is the method for assessing whether the internal bore of a microduct remains uncompromised, enabling optical fibre cables to be effectively installed using air blowing techniques.
- Applicability: The standard is relevant to microducts and protected microduct assemblies used for the installation of not only optical cable, but also optical fibre units and microduct fibre units.
- Test Object: The method specifies the passage of a test object-such as a sphere or short cable piece-through the microduct, simulating worst-case conditions without the assistance of push or blowing force.
- Uniformity and Repeatability: The procedure delivers a standard, repeatable process for cable and microduct manufacturers and installers to gauge product integrity, reducing installation risk and ensuring reliable optical fibre network performance.
- Process Steps:
- Prepare a specified sample length of microduct.
- Select and measure the test object.
- Pass the test object through the microduct under gravity (by tilting the sample).
- Document results and any deviations.
Applications
The microduct inner clearance test described by EN IEC 60794-1-131:2026 has vital applications in:
- Manufacturing Quality Control: Verifying that microducts produced meet the required internal clearance specification before field deployment.
- Cable Installation: Ensuring the unobstructed passage of optical fibre cables prevents costly failures during the installation phase, particularly in high-speed, high-density telecommunications networks.
- Maintenance and Compliance: Providing a reliable method for ongoing verification by network operators and contractors when assessing microduct integrity after repairs, aging, or environmental exposure.
- Product Development: Enabling manufacturers to design and test new microduct formats with assurance of compliance with international best practices.
Related Standards
For optimal implementation and broader context, consider the following related standards:
- IEC 60794-1-2: Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test procedures – General guidance.
- Previous Editions: IEC 60794-1-21:2015 and Amendment 1:2020; these have been replaced in part by this updated, standalone method.
- Other IEC 60794-1-1xx Series Documents: Covering a range of test methods for optical cable elements, providing a complete framework for mechanical and environmental performance evaluation.
Practical Value
Adopting EN IEC 60794-1-131:2026:
- Minimizes Installation Failures: By applying a standardized clearance test, network designers and installers reduce the risk of blockages or jams that compromise cable performance.
- Improves Network Reliability: Ensures fault-free routing of fibres in microducts, safeguarding data transmission quality for critical fibre optic networks.
- Facilitates Global Trade and Compliance: As an internationally harmonized standard, it supports product acceptance across multiple markets and regulatory environments.
- Promotes Consistency: Enables transparent, reproducible test results for all industry stakeholders, from cable manufacturers to large-scale network providers.
For anyone involved in the design, manufacture, installation, or maintenance of optical fibre cable infrastructure, compliance with EN IEC 60794-1-131:2026 is an essential component for robust and future-proof network performance.
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Frequently Asked Questions
EN IEC 60794-1-131:2026 is a standard published by CLC. Its full title is "Optical fibre cables - Part 1-131: Generic specification - Basic optical cable test procedures - Mechanical tests methods - Microduct inner clearance test, Method E31". This standard covers: IEC 60794-1-131:2026 describes the test procedures used to establish uniform requirements for microduct used to install optical fibre cables by blowing technique for the mechanical property - microduct inner clearance test. This document applies to microduct for use in optical fibre cable installation by blowing. NOTE Throughout the document, the wording “optical cable” can also include optical fibre units, microduct fibre units, etc. This first edition cancels and replaces Method E31 of the first edition of IEC 60794-1-21 published in 2015, Amendment 1:2020. This edition constitutes a technical revision. edition includes the significant technical changes with respect to IEC 60794‑1‑21:2015/AMD1:2020: a) Specification of Method E31.
IEC 60794-1-131:2026 describes the test procedures used to establish uniform requirements for microduct used to install optical fibre cables by blowing technique for the mechanical property - microduct inner clearance test. This document applies to microduct for use in optical fibre cable installation by blowing. NOTE Throughout the document, the wording “optical cable” can also include optical fibre units, microduct fibre units, etc. This first edition cancels and replaces Method E31 of the first edition of IEC 60794-1-21 published in 2015, Amendment 1:2020. This edition constitutes a technical revision. edition includes the significant technical changes with respect to IEC 60794‑1‑21:2015/AMD1:2020: a) Specification of Method E31.
EN IEC 60794-1-131:2026 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.
EN IEC 60794-1-131:2026 has the following relationships with other standards: It is inter standard links to EN 60794-1-21:2015, EN 60794-1-21:2015/A1:2020, EN IEC 60794-1-2:2021, EN 3745-505:2018, EN IEC 62148-1:2018, CLC/TS 50621:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN IEC 60794-1-131:2026 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-april-2026
Nadomešča:
SIST EN 60794-1-21:2015
SIST EN 60794-1-21:2015/A1:2020
Optični kabli - 1-131. del: Splošna specifikacija - Osnovni preskusni postopki za
optične kable - Mehanske preskusne metode - Preskus notranje zračnosti
mikrocevovoda, metoda E31 (IEC 60794-1-131:2026)
Optical fibre cables - Part 1-131: Generic specification - Basic optical cable test
procedures - Mechanical tests methods - Microduct inner clearance test, Method E31
(IEC 60794-1-131:2026)
Lichtwellenleiterkabel - Teil 1-131: Fachgrundspezifikation - Grundlegende Prüfverfahren
für Lichtwellenleiterkabel - Mechanische Prüfverfahren - Prüfung des Durchgangs von
Mikrorohren, Verfahren E31 (IEC 60794-1-131:2026)
Câbles à fibres optiques - Partie 1-131: Spécification générique - Procédures
fondamentales d’essais des câbles optiques - Méthodes d’essais mécaniques - Essai de
jeu interne du microconduit, Méthode E31 (IEC 60794-1-131:2026)
Ta slovenski standard je istoveten z: EN IEC 60794-1-131:2026
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 60794-1-131
NORME EUROPÉENNE
EUROPÄISCHE NORM February 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 1-131: Generic specification - Basic
optical cable test procedures - Mechanical tests methods -
Microduct inner clearance test, Method E31
(IEC 60794-1-131:2026)
Câbles à fibres optiques - Partie 1-131: Spécification Lichtwellenleiterkabel - Teil 1-131: Fachgrundspezifikation -
générique - Procédures fondamentales d'essais des câbles Grundlegende Prüfverfahren für Lichtwellenleiterkabel -
optiques - Méthodes d'essais mécaniques - Essai de jeu Mechanische Prüfverfahren - Prüfung des Durchgangs von
interne du microconduit, Méthode E31 Mikrorohren, Verfahren E31
(IEC 60794-1-131:2026) (IEC 60794-1-131:2026)
This European Standard was approved by CENELEC on 2026-02-11. 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 60794-1-131:2026 E
European foreword
The text of document 86A/2533/CDV, future edition 1 of IEC 60794-1-131, 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 60794-1-131:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-02-28
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-02-28
document have to be withdrawn
This document partially supersedes EN 60794-1-21:2015 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 60794-1-131:2026 was approved by CENELEC as a
European Standard without any modification.
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 60794-1-2 - Optical fibre cables - Part 1-2: Generic EN IEC 60794-1-2 -
specification - Basic optical cable test
procedures - General guidance
IEC 60794-1-131 ®
Edition 1.0 2026-01
INTERNATIONAL
STANDARD
Optical fibre cables -
Part 1-131: Generic specification - Basic optical cable test procedures -
Mechanical tests methods - Microduct inner clearance test, Method E31
ICS 33.180.10 ISBN 978-2-8327-0962-7
IEC 60794-1-131:2026-01(en)
IEC 60794-1-131:2026 © IEC 2026
CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General requirements. 5
5 Object . 5
6 Sample . 5
7 Apparatus . 6
8 Procedure . 6
9 Requirements . 6
9.1 General . 6
9.2 Details to be specified . 6
9.3 Details to be reported . 6
IEC 60794-1-131:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Optical fibre cables -
Part 1-131: Generic specification - Basic optical cable test procedures -
Mechanical tests methods - Microduct inner clearance test, Method E31
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 tech
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