oSIST prEN IEC 60794-1-135:2025

Optical fibre cables - Part 1-135: Generic specification - Basic optical cable test procedures - Mechanical tests methods - Sheave test, Method E35

Lichtwellenleiterkabel – Teil 1-135: Fachgrundspezifikationen - Grundlegende Prüfverfahren für Lichtwellenleiterkabel - Mechanische Prüfverfahren - Seilscheibenprüfung, Verfahren E35

Câbles à fibres optiques - Partie 1-135: Spécification générique - Procédures fondamentales d’essais des câbles optiques - Méthodes d’essais mécaniques - Essai des poulies, Méthode E35

Optični kabli - 1-135. del: Splošna specifikacija - Osnovni preskusni postopki za optične kable - Mehanske preskusne metode - Preskus z jermenico, metoda E35

General Information

• Status: Not Published
• Public Enquiry End Date: 30-Oct-2025
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 18-Aug-2025
• Due Date: 05-Jan-2026
• Completion Date: 21-Oct-2025
• Ref Project: prEN IEC 60794-1-135:2025 - Optical fibre cables - Part 1-135: Generic specification - Basic optical cable test procedures - Mechanical tests methods - Sheave test, Method E35

Relations

• Splited From: SIST EN 60794-1-21:2015 - Optical fibre cables -- Part 1-21: Generic specification - Basic optical cable test procedures - Mechanical tests methods (IEC 60794-1-21:2015)
• Effective Date: 09-Sep-2025
• Splited From: SIST EN 60794-1-21:2015/A1:2020 - Optical fibre cables - Part 1-21: Generic specification - Basic optical cable test procedures - Mechanical tests methods (IEC 60794-1-21:2015/A1:2020)
• Effective Date: 09-Sep-2025

Overview

prEN IEC 60794-1-135:2025 - "Optical fibre cables - Part 1-135: Generic specification - Basic optical cable test procedures - Mechanical test methods - Sheave test, Method E35" defines a standardized sheave (pulley) bending test for aerial optical fibre cables. The method determines the ability of OPGW, OPPC, OPAC and ADSS cables to withstand bending over sheaves or bows under a specified load during installation. The document is part of the IEC 60794 series and replaces the earlier Method E18B in IEC 60794-1-21.

Key topics and technical requirements

• Test scope and objectives
  • Simulate bending stresses experienced during aerial installation to assess mechanical and optical performance.
• Two procedures
  • Procedure 1: Single sheave bend (specified radius R and bending angle θ). Typical angles: 30° for OPGW/OPPC; 45°±15° or 70° commonly used for ADSS.
  • Procedure 2: S–Z bend using three inline sheaves with fixed relative positions.
• Sample and marking
  • Samples taken from a finished cable end, terminated to apply load, marked at points A and B. Distance A–B ≥ three times maximum lay length for helically stranded cables.
• Apparatus
  • Tensile device (maximum error ±3 %).
  • Semi-circular sheave groove sized to allow free cable motion.
  • Optional optical test equipment per IEC 60793-1-46 (attenuation) and IEC 60793-1-22 (fibre elongation) when optical measurements are required.
• Procedure elements
  • Apply specified tension, cycle the cable between A and B (or move sheaves relative to cable), record number of cycles and speed as specified.
  • Measure attenuation before loading and after unloading (recommended rest ≥ 10 minutes unless otherwise specified).
  • If required, measure cable/metallic unit diameters and calculate ovality per IEC 60794-1-1.
• Pass/fail criteria
  • No visible sheath or element damage under unaided visual inspection.
  • Any permanent change in attenuation, fibre strain, or ovality must not exceed values specified in the relevant product specification.

Applications

• Used by manufacturers and test laboratories to qualify aerial cables for installation stresses.
• Guides acceptance testing for telecom utilities, power utilities (OPGW/OPPC), contractors, and network planners.
• Useful during product development, type approval, and quality control to ensure cables meet installation- and service-related bending requirements.

Who should use this standard

• Cable designers and manufacturers
• Independent testing laboratories
• Telecom and power utility specification writers
• Field installation engineers and qualification teams

Related standards

• IEC 60794-1-1 (general terms and requirements)
• IEC 60794-1-2 (test guidance and atmospheric conditions)
• IEC 60793-1-22 (fibre length/elongation measurement)
• IEC 60793-1-46 (attenuation monitoring)

Keywords: prEN IEC 60794-1-135:2025, sheave test, optical fibre cables, OPGW, OPPC, ADSS, mechanical test, attenuation, ovality, bending test.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2025
Optični kabli - 1-135. del: Splošna specifikacija - Osnovni preskusni postopki za
optične kable - Mehanske preskusne metode - Preskus z jermenico, metoda E35
Optical fibre cables - Part 1-135: Generic specification - Basic optical cable test
procedures - Mechanical tests methods - Sheave test, Method E35
Câbles à fibres optiques - Partie 1-135: Spécification générique - Procédures
fondamentales d’essais des câbles optiques - Méthodes d’essais mécaniques - Essai
des poulies, Méthode E35
Ta slovenski standard je istoveten z: prEN IEC 60794-1-135:2025
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.

86A/2601/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60794-1-135 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-08-08 2025-10-31
SUPERSEDES DOCUMENTS:
86A/2454/CD, 86A/2598/CC
IEC SC 86A : FIBRES AND CABLES
SECRETARIAT: SECRETARY:
France Mr Laurent Gasca
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees,
members of CENELEC, is drawn to the fact that
this Committee Draft for Vote (CDV) is submitted
for parallel voting.
The CENELEC members are invited to vote
through the CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant
patent rights of which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In
Some Countries” clauses to be included should this proposal proceed. Recipients are reminded that
the CDV stage is the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Optical fibre cables - Part 1-135: Generic specification - Basic optical cable test procedures -
Mechanical tests methods - Sheave test, Method E35

PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
permitted to download this electronic file, to make a copy and to print out the content for the sole
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IEC CDV 60794-1-135 © IEC 2025
1 CONTENTS
3 FOREWORD . 2
4 1 Scope . 4
5 2 Normative references . 4
6 3 Terms and definitions . 4
7 4 Method E35: Sheave test. 4
8 4.1 Object . 4
9 4.2 Sample . 5
10 4.3 Apparatus . 5
11 4.4 Procedure . 6
12 4.5 Requirements . 7
13 4.6 Details to be specified . 7
14 4.7 Details to be reported . 8
15 Bibliography . 9
17 Figure 1 – Single sheave test.6
18 Figure 2 – Three sheaves test.7
IEC CDV 60794-1-135 © IEC 2025
20 INTERNATIONAL ELECTROTECHNICAL COMMISSION
21 ____________
23 OPTICAL FIBRE CABLES –
25 Part 1-135: Generic specification – Basic optical cable test procedures –
26 Mechanical test methods – Sheave test, Method E35
28 FOREWORD
29 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
30 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
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56 Publications.
57 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
58 indispensable for the correct application of this publication.
59 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
60 rights. IEC shall not be held responsible for identifying any or all such patent rights.
61 IEC 60794-1-135 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical
62 committee 86: Fibre optics. It is an International Standard.
63 This first edition cancels and replaces Method E18B of the second edition of IEC 60794-1-21
64 published in 2020. This edition constitutes a technical revision.
65 This edition includes the following significant technical changes with respect to the previous
66 edition:
67 a) the mechanical test contained in IEC 60794-1-21: 2015+AMD1:2020 will now be individually
68 numbered in the IEC 60794-1-1xx series. Each test method is now considered to be an
69 individual document rather than part of a multi-test method compendium.
70 b) expand applicable scope, add OPPC and ADSS.
71 c) add the methods and standards of optical testing.
72 d) add the measurement and requirement of maximum allowable ovality.
73 e) add chapter “4.7 Details to be reported”.
74 The text of this International Standard is based on the following documents:
IEC CDV 60794-1-135 © IEC 2025
Draft Report on voting
86A/XX/FDIS 86A/XX/RVD
76 Full information on the voting for its approval can be found in the report on voting indicated in
77 the above table.
78 The language used for the development of this International Standard is English.
79 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
80 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
81 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
82 described in greater detail at www.iec.ch/publications.
83 A list of all parts in the IEC 60794 series, published under the general title Optical fibre cables,
84 can be found on the IEC website.
85 The committee has decided that the contents of this document will remain unchanged until the
86 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
87 specific document. At this date,
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