SIST 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 (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)
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 (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)
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)
General Information
- Status
- Published
- Public Enquiry End Date
- 30-Apr-2025
- Publication Date
- 11-Mar-2026
- Technical Committee
- MOC - Mobile Communications
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 23-Feb-2026
- Due Date
- 30-Apr-2026
- Completion Date
- 12-Mar-2026
Relations
- Effective Date
- 01-Apr-2026
- Effective Date
- 01-Apr-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 20-Feb-2026
- Effective Date
- 20-Feb-2026
- Effective Date
- 20-Feb-2026
Overview
prEN IEC 60794-1-131:2025 (Method E31) specifies the microduct inner clearance test used with optical fibre cable installations by blowing. The test confirms that the inner bore of a short microduct or protected microduct assembly is maintained after manufacture or after exposure to mechanical or environmental tests. A successful E31 test indicates the microduct has not been significantly deformed or obstructed and is suitable for blown cable installation.
This method is intended to provide a reproducible, supplier–customer agreed check of bore integrity using simple apparatus and a clear acceptance requirement: the test object shall pass through the microduct.
Key Topics
- Objective: Verify maintenance of the microduct inner bore following manufacture or testing (e.g., crush, environmental exposure).
- Scope: Applies to microducts intended for optical fibre cable installation by blowing techniques.
- Sample: A short length of microduct or microduct assembly, typically 2 m and no less than 1 m.
- Test object:
- Can be a sphere or a short length (for example, 100 mm) of similar sized cable or fibre unit.
- For practical agreement, the test object diameter shall be no less than 85 % of the nominal microduct bore diameter, unless otherwise agreed between supplier and customer.
- Apparatus:
- Test object as above.
- A safe catcher or method to retrieve the object at the far end of the sample.
- Procedure:
- Place the test object into the test sample and allow it to travel to the far end. The typical method is to tilt the sample from horizontal to vertical to let gravity move the object through the bore.
- Acceptance:
- Requirement: The object shall pass through the microduct.
Applications
This test is directly applicable to manufacturers, test laboratories, and end-users involved in microduct and blown optical-fibre cable deployments. Practical uses include:
- Quality control after extrusion or assembly of microducts.
- Verification following mechanical tests (e.g., crush, bending) or environmental conditioning.
- Supplier–customer acceptance testing to ensure compatibility with blown cable units.
Benefits:
- Simple, low-cost verification of bore integrity.
- Representative of a worst-case static obstruction condition (no push/blowing forces applied).
- Facilitates clear pass/fail criteria for installation readiness.
Related Standards
- IEC 60794-1-2 - General guidance for basic optical cable test procedures. This document provides the general requirements and definitions that apply across the IEC 60794-1-1xx series.
Test Reporting and Specification Details
The specification and test report should record:
- To be specified: Test object dimensions, mass and surface material; microduct inner diameter (ID) and outer diameter (OD); and sample length.
- To be reported: The test result (pass/fail) and any deviation from the method.
Method E31 offers a concise, repeatable procedure to confirm that microducts will allow passage of cable units intended for blown installation, supporting reliable fibre deployments.
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Frequently Asked Questions
SIST EN IEC 60794-1-131:2026 is a standard published by the Slovenian Institute for Standardization (SIST). 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 (IEC 60794-1-131:2026)". 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.
SIST 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.
SIST EN IEC 60794-1-131:2026 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 60794-1-2:2021, SIST EN 3745-505:2018, SIST-TS CLC/TS 50621:2016, SIST EN IEC 62148-1:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST 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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