EN IEC 60794-2-50:2023

Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex and duplex cables for use in terminated cable assemblies

IEC 60794-2-50:2023 is available as IEC 60794-2-50:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60794-2-50:2023 specifies requirements for simplex and duplex optical fibre cables for use in terminated cable assemblies or as used for termination of passive components. This third edition cancels and replaces the second edition published in 2020. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) added IEC 60793-1-46 and IEC 60794-1-211 to the normative references; b) changed the load duration for the tensile test from 5 min to 10 min; c) clarified the distance between the clamps for torsion test to 125 times cable diameter, but not less than 0,3 m; d) recommended the temperatures –10 °C and +60 °C for indoor simplex and duplex cables and included the low and high temperatures for category C, CHD, OP and OPHD according to the operating service environments in IEC 61753-1 for temperature cycling and shrinkage testing; e) updated the shrinkage test standard to IEC 60794-1-211, F11A, and changed the requirement to maximum 20 mm; f) replaced the text for the fire performance with an improved description.

Lichtwellenleiterkabel - Teil 2-50: LWL-Innenkabel - Familienspezifikation für Simplex- und Duplexkabel für den Einsatz in konfektionierten Kabeln

Câbles à fibres optiques - Partie 2-50: Câbles intérieurs - Spécification de famille pour les câbles simplex et duplex utilisés dans les câbles assemblés équipés

IEC 60794-2-50:2023 est disponible sous forme de IEC 60794-2-50:2023 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60794-2-50:2023 spécifie les exigences pour les câbles simplex et duplex à fibres optiques utilisés dans des câbles assemblés équipés ou comme terminaison pour des composants passifs.Cette troisième édition annule et remplace la deuxième édition parue en 2020. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) ajout de l’IEC 60793-1-46 et de l’IEC 60794-1-211 dans les références normatives; b) modification de la durée d’application des charges pour l’essai de traction qui est portée de 5 min à 10 min; c) clarification de la distance entre les pinces pour l’essai de torsion de 125 fois le diamètre du câble, mais pas moins de 0,3 m; d) recommandation des températures –10 °C et +60 °C pour les câbles intérieurs simplex et duplex et inclusion des températures hautes et basses pour les catégories C, CHD, OP et OPHD conformément aux environnements de service ou de fonctionnement de l’IEC 61753­1 pour les essais de cycles de température et de rétraction; e) mise à jour de la norme d’essai de rétraction conformément à l’IEC 60794-1-211, F11A, et modification de l’exigence à 20 mm au maximum; f) remplacement du texte du comportement au feu par une description améliorée.

Optični kabli - 2-50. del: Notranji kabli - Skupinska specifikacija za simpleksne in dupleksne kable za zaključene kabelske sestave (IEC 60794-2-50:2023)

Ta del standarda IEC 60794 je sklop specifikacij, ki določa zahteve za simpleksne in dupleksne optične kable za zaključene kabelske sestave ali za zaključevanje pasivnih komponent.

General Information

• Status: Published
• Publication Date: 11-May-2023
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: CLC/TC 86A - Optical fibres and optical fibre cables
• Drafting Committee: IEC/SC 86A - IEC_SC_86A
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 12-May-2023
• Due Date: 21-Jun-2024
• Completion Date: 12-May-2023
• Ref Project: SIST EN IEC 60794-2-50:2023 - Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex and duplex cables for use in terminated cable assemblies (IEC 60794-2-50:2023)

Relations

• Replaces: EN IEC 60794-2-50:2020 - Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex and duplex cables for use in terminated cable assemblies
• Effective Date: 30-Nov-2021

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2023
Optični kabli - 2-50. del: Notranji kabli - Skupinska specifikacija za simpleksne in
dupleksne kable za zaključene kabelske sestave (IEC 60794-2-50:2023)
Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex and
duplex cables for use in terminated cable assemblies (IEC 60794-2-50:2023)
Lichtwellenleiterkabel - Teil 2-50: LWL-Innenkabel - Familienspezifikation für Simplex-
und Duplexkabel für den Einsatz in konfektionierten Kabeln (IEC 60794-2-50:2023)
Câbles à fibres optiques - Partie 2-50: Câbles intérieurs - Spécification de famille pour
les câbles simplex et duplex utilisés dans les câbles assemblés équipés (IEC 60794-2-
50:2023)
Ta slovenski standard je istoveten z: EN IEC 60794-2-50:2023
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 60794-2-50

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2023
ICS 33.180.10 Supersedes EN IEC 60794-2-50:2020
English Version
Optical fibre cables - Part 2-50: Indoor cables - Family
specification for simplex and duplex cables for use in terminated
cable assemblies
(IEC 60794-2-50:2023)
Câbles à fibres optiques - Partie 2-50: Câbles intérieurs - Lichtwellenleiterkabel - Teil 2-50: LWL-Innenkabel -
Spécification de famille pour les câbles simplex et duplex Familienspezifikation für Simplex- und Duplexkabel für den
utilisés dans les câbles assemblés équipés Einsatz in konfektionierten Kabeln
(IEC 60794-2-50:2023) (IEC 60794-2-50:2023)
This European Standard was approved by CENELEC on 2023-05-05. 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
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60794-2-50:2023 E

European foreword
The text of document 86A/2284/FDIS, future edition 3 of IEC 60794-2-50, 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 60794-2-50:2023.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-02-05
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-05-05
document have to be withdrawn
This document supersedes EN IEC 60794-2-50:2020 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 60794-2-50:2023 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60793-1-1 NOTE Approved as EN IEC 60793-1-1
IEC 61753-1 NOTE Approved as EN IEC 61753-1
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 60793-1-20 - Optical fibres - Part 1-20: Measurement EN 60793-1-20 -
methods and test procedures - Fibre
geometry
IEC 60793-1-21 - Optical fibres - Part 1-21: Measurement EN 60793-1-21 -
methods and test procedures - Coating
geometry
IEC 60793-1-32 - Optical fibres - Part 1-32: Measurement EN IEC 60793-1-32 -
methods and test procedures - Coating
strippability
IEC 60793-1-40 - Optical fibres - Part 1-40: Attenuation EN IEC 60793-1-40 -
measurement methods
IEC 60793-1-46 - Optical fibres - Part 1-46: Measurement EN 60793-1-46 -
methods and test procedures - Monitoring
of changes in optical transmittance
IEC 60793-2-10 - Optical fibres - Part 2-10: Product EN IEC 60793-2-10 -
specifications - Sectional specification for
category A1 multimode fibres
IEC 60793-2-50 - Optical fibres - Part 2-50: Product EN IEC 60793-2-50 -
specifications - Sectional specification for
class B single-mode fibres
IEC 60794-1-1 - Optical fibre cables - Part 1-1: Generic EN 60794-1-1 -
specification - General
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 60794-1-21 - Optical fibre cables - Part 1-21: Generic EN 60794-1-21 -
specification - Basic optical cable test
procedures - Mechanical tests methods
IEC 60794-1-22 - Optical fibre cables - Part 1-22: Generic EN IEC 60794-1-22 -
specification - Basic optical cable test
procedures - Environmental test methods
IEC 60794-1-23 - Optical fibre cables - Part 1-23: Generic EN IEC 60794-1-23 -
specification - Basic optical cable test
procedures - Cable element test methods
IEC 60794-1-211 - Optical fibre cables - Part 1-211: Generic EN IEC 60794-1-211 -
specification - Basic optical cable test
procedures - Environmental test methods -
Sheath shrinkage, method F11
IEC 60794-2 - Optical fibre cables - Part 2: Indoor cables EN 60794-2 -
- Sectional specification
IEC 60811-202 - Electric and optical fibre cables - Test EN 60811-202 -
methods for non-metallic materials - Part
202: General tests - Measurement of
thickness of non-metallic sheath
IEC 60811-203 - Electric and optical fibre cables - Test EN 60811-203 -
methods for non-metallic materials - Part
203: General tests - Measurement of
overall dimensions
IEC 60794-2-50 ®
Edition 3.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibre cables –
Part 2-50: Indoor cables – Family specification for simplex and duplex cables for
use in terminated cable assemblies
Câbles à fibres optiques –
Partie 2-50: Câbles intérieurs – Spécification de famille pour les câbles simplex
et duplex utilisés dans les câbles assemblés équipés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-6711-0
– 2 – IEC 60794-2-50:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Construction . 8
4.1 General . 8
4.2 Optical fibres and primary coating . 8
4.3 Buffer . 8
4.4 Tube . 9
4.5 Strength and anti-buckling members . 9
4.6 Sheath . 9
4.7 Sheath marking . 9
4.8 Examples of cable constructions . 9
5 Tests . 10
5.1 General . 10
5.2 Dimensions . 10
5.3 Mechanical requirements . 11
5.3.1 Tensile performance . 11
5.3.2 Crush . 11
5.3.3 Impact . 12
5.3.4 Repeated bending . 12
5.3.5 Bend . 12
5.3.6 Torsion . 13
5.3.7 Bend at low temperature . 13
5.3.8 Kink . 14
5.3.9 Sheath pull-off force . 14
5.3.10 Abrasion resistance of cable marking . 14
5.3.11 Buffered fibre movement under compression . 14
5.4 Environmental requirements . 15
5.4.1 Temperature cycling . 15
5.4.2 Sheath shrinkage . 15
6 Transmission requirements . 16
7 Fire performance . 16
Annex A (informative) Examples of cable constructions . 17
Annex B (informative) Guidance on the selection of tests applicable to optical fibre
cables for use in terminated cable assemblies . 20
Bibliography . 23

Figure A.1 – Simplex non-buffered cable . 17
Figure A.2 – Simplex cable . 17
Figure A.3 – Duplex non-buffered cable . 18
Figure A.4 – Duplex cable . 18
Figure A.5 – Duplex zip cord cable . 18
Figure A.6 – Duplex flat cable . 19

IEC 60794-2-50:2023 © IEC 2023 – 3 –
Figure A.7 – Duplex round cable (breakout cable) . 19

Table 1 – Outer dimensions of buffered fibres . 9
Table 2 – Preferred low and high temperatures . 15
Table B.1 – Cable test method summary . 20
Table B.2 – Blank detail specification for cable testing agreement . 22

– 4 – IEC 60794-2-50:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 2-50: Indoor cables – Family specification for simplex
and duplex cables for use in terminated cable assemblies

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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60794-2-50 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical
committee 86: Fibre optics. It is an International Standard.
This third edition cancels and replaces the second edition published in 2020. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) added IEC 60793-1-46 and IEC 60794-1-211 to the normative references;
b) changed the load duration for the tensile test from 5 min to 10 min;
c) clarified the distance between the clamps for torsion test to 125 times cable diameter, but
not less than 0,3 m;
IEC 60794-2-50:2023 © IEC 2023 – 5 –
d) recommended the temperatures –10 °C and +60 °C for indoor simplex and duplex cables
HD HD
and included the low and high temperatures for category C, C , OP and OP according
to the operating service environments in IEC 61753-1 for temperature cycling and shrinkage
testing;
e) updated the shrinkage test standard to IEC 60794-1-211, F11A, and changed the
requirement to maximum 20 mm;
f) replaced the text for the fire performance with an improved description.
The text of this International Standard is based on the following documents:
Draft Report on voting
86A/2284/FDIS 86A/2316/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 the 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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

– 6 – IEC 60794-2-50:2023 © IEC 2023
INTRODUCTION
This document includes test methods according to IEC 60794-1-21, IEC 60794-1-22 and
IEC 60794-1-23 that will be split into single documents and individually renumbered in the
IEC 60794-1-1xx series, IEC 60794-1-2xx series and IEC 60794-1-3xx series. Full cross-
reference details are given in IEC 60794-1-2.

IEC 60794-2-50:2023 © IEC 2023 – 7 –
OPTICAL FIBRE CABLES –
Part 2-50: Indoor cables – Family specification for simplex
and duplex cables for use in terminated cable assemblies

1 Scope
This part of IEC 60794 is a family specification that specifies requirements for simplex and
duplex optical fibre cables for use in terminated cable assemblies or as used for termination of
passive components.
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 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures – Fibre
geometry
IEC 60793-1-21, Optical fibres – Part 1-21: Measurement methods and test procedures –
Coating geometry
IEC 60793-1-32, Optical fibres – Part 1-32: Measurement methods and test procedures –
Coating strippability
IEC 60793-1-40, Optical fibres – Part 1-40: Attenuation measurement methods
IEC 60793-1-46, Optical fibres – Part 1-46: Measurement methods and test procedures –
Monitoring of changes in optical transmittance
IEC 60793-2-10, Optical fibres – Part 2-10: Product specifications – Sectional specification for
category A1 multimode fibres
IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for
class B single-mode fibres
IEC 60794-1-1, Optical fibre cables – Part 1-1: Generic specification – General
IEC 60794-1-2, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test
procedures – General guidance
IEC 60794-1-211, Optical fibre cables – Part 1-211: Generic specification – Basic optical cable
test procedures – Environmental test methods – Sheath shrinkage, method F11
IEC 60794-1-21, Optical fibre cables – Part 1-21: Generic specification – Basic optical cable
test procedures – Mechanical tests methods
IEC 60794-1-22, Optical fibre cables – Part 1-22: Generic specification – Basic optical cable
test procedures – Environmental tests methods

– 8 – IEC 60794-2-50:2023 © IEC 2023
IEC 60794-1-23, Optical fibre cables – Part 1-23: Generic specification – Basic optical cable
test procedures – Cable element test methods
IEC 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification
IEC 60811-202, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 202: General tests – Measurement of thickness of non-metallic sheath
IEC 60811-203, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 203: General tests – Measurement of overall dimensions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60794-1-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
terminated cable assembly
cable terminated with connectors
Note 1 to entry: Examples from the ISO/IEC 11801 series are optical fibre cords used to establish connections on
patch panels, equipment and at work areas or to connect outlets to the terminal equipment.
Note 2 to entry: A so called patch cord or jumper is one type of a terminated cable assembly.
4 Construction
4.1 General
In addition to the constructional requirements in IEC 60794-2, the following considerations
apply to simplex and duplex indoor cables for use in terminated cable assemblies.
It is not the intention of this document to specify the finished terminated cable assembly
complete with terminations.
There shall be no fibre splice in a delivery length. It shall be possible to identify each individual
fibre throughout the length of the cable.
4.2 Optical fibres and primary coating
Multimode or single-mode optical fibres meeting the requirements of IEC 60793-2-10
sub-categories A1-OM1 or A1-OM2 to A1-OM5 or IEC 60793-2-50 class B shall be used.
4.3 Buffer
If a tight or semi-tight (loosely applied) buffer is required, it shall consist of one or more layers
of inert material. Unless otherwise specified, the tight buffer shall be removed in one operation
together with fibre coating over the specified length. Semi-tight tubes may be filled. For
semi-tight and loose buffer, the buffer material is removed for a specified length leaving the
primary coating of the fibre intact.

IEC 60794-2-50:2
...