SIST 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 (IEC 60794-2-50:2020)

EN-IEC 60794-2-50 is a family specification that specifies requirements for simplex andduplex optical fibre cables for use in terminated cable assemblies or for termination with opticalfibre passive components.

Lichtwellenleiterkabel - Teil 2-50: LWL-Innenkabel - Familienspezifikation für Simplex- und Duplexkabel für den Einsatz in konfektionierten Kabeln (IEC 60794-2-50:2020)

Câbles à fibres optiques - Partie 2-50: Câbles intérieurs - Spécification de famille pour les câbles simplex et duplex utilisés dans les ensembles de câbles équipés (IEC 60794-2-50:2020)

IEC 60794-2-50:2020 donne les exigences pour les câbles simplex et duplex à fibres optiques utilisés dans des ensembles de câbles équipés ou en vue d’être équipés par des composants passifs à fibres optiques. Cette deuxième édition annule et remplace la première édition parue en 2008. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:

   
1. mise à jour des références normatives;

   
2. révision et mise à jour des paramètres et des exigences pour les essais mécaniques et les essais d’environnement;

   
3. l’Annexe B a été retirée et la méthode d’essai pour l’évaluation de la force d’arrachage de la gaine fait référence à la méthode E21 de l’IEC 60794-1-21;

   
4. l’Annexe C a été retirée et la méthode d’essai pour l’évaluation de la rétraction de la gaine fait référence à la méthode F11 de l’IEC 60794-1-22;

   
5. l’Annexe D a été retirée et la méthode d’essai pour le mouvement des fibres sous revêtement protecteur sous l’effet d’une compression fait référence à la méthode E22 de l’IEC 60794-1-21;

   
6. l’Annexe E a été retirée et la méthode d’essai pour les cycles de température fait référence à la méthode F12 de l’IEC 60794-1-22;

   
7. mise à jour des désignations de types de fibres et ajout d’une nouvelle fibre MM à large bande facultative.

Mots clés: câbles simplex et duplex à fibres optiques

Optični kabli - 2-50. del: Notranji kabli - Skupinska specifikacija za simpleksne in dupleksne kable za zaključene kabelske sestave (IEC 60794-2-50:2020)

General Information

• Status: Published
• Publication Date: 06-Apr-2020
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Mar-2020
• Due Date: 17-May-2020
• Completion Date: 07-Apr-2020
• Ref Project: 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

Relations

• Revised: SIST EN 60794-2-50:2008 - Optical fibre cables -- Part 2-50: Indoor cables - Family specification for simplex and duplex cables for use in terminated cable assemblies
• Effective Date: 21-Jun-2016
• Revised: 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)
• Effective Date: 30-Nov-2021
• Revised: SIST EN 50551-2:2014 - Simplex and duplex cables to be used for cords - Part 2: Detailed Specification and minimum requirements for simplex ruggedized single mode cables to be used for patchcord/cords Category U
• Effective Date: 30-Jan-2018
• Replaces: SIST EN 50551-2:2014 - Simplex and duplex cables to be used for cords - Part 2: Detailed Specification and minimum requirements for simplex ruggedized single mode cables to be used for patchcord/cords Category U
• Effective Date: 07-Jun-2022
• Replaces: SIST EN 60794-2-50:2008 - Optical fibre cables -- Part 2-50: Indoor cables - Family specification for simplex and duplex cables for use in terminated cable assemblies
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60794-2-50:2020
01-maj-2020
Nadomešča:
SIST EN 50551-2:2014
SIST EN 60794-2-50:2008
Optični kabli - 2-50. del: Notranji kabli - Skupinska specifikacija za simpleksne in
dupleksne kable za zaključene kabelske sestave (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 (IEC 60794-2-50:2020)
Lichtwellenleiterkabel - Teil 2-50: LWL-Innenkabel - Familienspezifikation für Simplex-
und Duplexkabel für den Einsatz in konfektionierten Kabeln (IEC 60794-2-50:2020)
Câbles à fibres optiques - Partie 2-50: Câbles intérieurs - Spécification de famille pour
les câbles simplex et duplex utilisés dans les ensembles de câbles équipés (IEC 60794-
2-50:2020)
Ta slovenski standard je istoveten z: EN IEC 60794-2-50:2020
ICS:
33.180.10 (Optična) vlakna in kabli Fibres and cables
SIST EN IEC 60794-2-50:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60794-2-50:2020

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SIST EN IEC 60794-2-50:2020


EUROPEAN STANDARD EN IEC 60794-2-50

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2020
ICS 33.180.10 Supersedes EN 50551-2:2013, EN 60794-2-50:2008 and
all of its amendments and corrigenda (if any)
English Version
Optical fibre cables - Part 2-50: Indoor cables - Family
specification for simplex and duplex cables for use in terminated
cable assemblies
(IEC 60794-2-50:2020)
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 ensembles de câbles équipés Einsatz in konfektionierten Kabeln
(IEC 60794-2-50:2020) (IEC 60794-2-50:2020)
This European Standard was approved by CENELEC on 2020-02-14. 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,
Turkey 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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60794-2-50:2020 E

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SIST EN IEC 60794-2-50:2020
EN IEC 60794-2-50:2020 (E)
European foreword
The text of document 86A/1972/FDIS, future edition 2 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 60794-2-50:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-11-14
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-02-14
document have to be withdrawn

This document supersedes EN 50551-2:2013 and EN 60794-2-50:2008 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.

Endorsement notice
The text of the International Standard IEC 60794-2-50:2020 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 standards
indicated:
IEC 60793-1-1 NOTE Harmonized as EN 60793-1-1
IEC 61753-1 NOTE Harmonized as EN IEC 61753-1

2

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SIST EN IEC 60794-2-50:2020
EN IEC 60794-2-50:2020 (E)
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.cenelec.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 60793-2-10 - 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 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
3

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SIST EN IEC 60794-2-50:2020
EN IEC 60794-2-50:2020 (E)
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 60794-2 - 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



4

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SIST EN IEC 60794-2-50:2020




IEC 60794-2-50

®


Edition 2.0 2020-01




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 ensembles de câbles équipés













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.180.10 ISBN 978-2-8322-7732-4




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 60794-2-50:2020
– 2 – IEC 60794-2-50:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Construction . 7
4.1 General . 7
4.2 Optical fibres and primary coating . 7
4.3 Buffer . 7
4.4 Tube . 8
4.5 Strength and anti-buckling members . 8
4.6 Sheath . 8
4.7 Sheath marking . 8
4.8 Examples of cable constructions . 8
5 Tests . 9
5.1 General . 9
5.2 Dimensions . 9
5.3 Mechanical requirements . 9
5.3.1 Tensile performance . 9
5.3.2 Crush . 10
5.3.3 Impact . 10
5.3.4 Repeated bending . 11
5.3.5 Bend . 11
5.3.6 Torsion . 11
5.3.7 Bend at low temperature . 12
5.3.8 Kink . 12
5.3.9 Sheath pull-off force . 12
5.3.10 Abrasion resistance of cable marking . 13
5.3.11 Buffered fibre movement under compression . 13
5.4 Environmental requirements . 13
5.4.1 Temperature cycling . 13
5.4.2 Shrinkage (informative) . 14
5.5 Transmission requirements . 14
5.6 Fire performance . 14
Annex A (informative)  Examples of types of cable constructions . 15
Annex B (informative) Guidance on the selection of tests applicable to optical fibre
cables for use in patchcords . 18
Bibliography . 21

Figure A.1 – Simplex loose non-buffered fibre cable . 15
Figure A.2 – Simplex fibre cable . 15
Figure A.3 – Duplex loose non-buffered fibre cable . 16
Figure A.4 – Duplex fibre cable . 16
Figure A.5 – Duplex fibre zip cord . 16
Figure A.6 – Duplex flat cable . 17
Figure A.7 – Duplex round cable (breakout cable) . 17

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SIST EN IEC 60794-2-50:2020
IEC 60794-2-50:2020 © IEC 2020 – 3 –

Table 1 – Dimensions of buffered fibres . 8
Table 2 – Temperature cycling ranges according to the application environment. 14
Table B.1 – Cable test method summary . 18
Table B.2 – Blank detail specification for cable testing agreement . 20

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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.
International Standard IEC 60794-2-50 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2008. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) update of the normative references;
b) review and update of parameters and requirements for mechanical tests and environmental
tests;
c) Annex B has been removed and test method for sheath pull-off force evaluation refers to
IEC 60794-1-21, method E21;
d) Annex C has been removed and test method for sheath shrinkage evaluation refers to
IEC 60794-1-22, method F11;

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SIST EN IEC 60794-2-50:2020
IEC 60794-2-50:2020 © IEC 2020 – 5 –
e) Annex D has been removed and test method for buffered fibre movement under compression
refers to IEC 60794-1-21, method E22;
f) Annex E has been removed and test method for temperature cycling evaluation refers to
IEC 60794-1-22, method F12;
g) fibre type designations have been updated and the new wideband MM fibre is included as
an option.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1972/FDIS 86A/1978/RVD

Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 61340 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 "http://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.

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SIST EN IEC 60794-2-50:2020
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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 for termination with optical
fibre 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 60793-2-10, 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 60794-1-21, 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
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

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SIST EN IEC 60794-2-50:2020
IEC 60794-2-50:2020 © IEC 2020 – 7 –
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
short length of cable provisioned with a connector at both ends
Note 1 to entry: Examples from ISO/IEC 11801 (all parts) are fibre optic cords used to establish connections on
patch panels, equipment and at work areas or to connect outlets to the terminal equipment.
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 and 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. Semi-tight tubes may be filled. Unless otherwise specified, the tight buffer
shall be removable in one operation together with fibre coating over a specified length. For
semi-tight and loose buffer, the buffer material is stripped off for a specified length leaving the
primary coating of the fibre intact.
Specified buffer strippability lengths:
– tight: 15 mm;
– semi tight: 300 mm;
– loose: 1,0 m minimum.

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Strip force shall comply to the values stated in the relevant specification and the evaluation
shall be carried out according IEC 60793-1-32.
Buffer dimensions are shown in Table 1.
Table 1 – Dimensions of buffered fibres
Nominal diameter Tolerances
mm mm
0,3 to 0,9 ±0,05

Lower tolerance levels can be a requirement for buffered fibres having a low nominal diameter
within the specified range. In such cases, tolerance values shall be agreed between supplier
and customer.
4.4 Tube
One or two primary coated or buffered fibres are packaged (loosely or not) in a tube construction
which may be filled. The tube may be reinforced with a composite wall.
If required, the suitability of the tube shall be determined by an evaluation of its kink resistance
in accordance with IEC 60794-1-23, method G7.
4.5 Strength and anti-buckling members
The cable shall be designed with sufficient strength members to meet the requirements of this
document.
The strength and/or anti-buckling member may be either metallic or non-metallic and may be
located in the cable core and/or under the sheath and/or in the sheath.
4.6 Sheath
The cable shall have a uniform overall protective sheath. The cable diameter shall be specified
in the relevant detail specification (or product specification). Sheath removal is an important
feature of these cables. Sheath pull-off force shall be determined in accordance with
IEC 60794-1-21, method E21.
4.7 Sheath marking
If required, the cable shall be marked as agreed between the customer and supplier. The
marking shall be resistant to abrasion, which shall be verified in accordance with
IEC 60794-1-21, method E2B, method 2.
4.8 Examples of cable constructions
Examples of some main types of cable construction are shown in Annex A.
Other configurations are not excluded if they meet the mechanical, environmental, transmission
and termination requirements given in this document.

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IEC 60794-2-50:2020 © IEC 2020 – 9 –
5 Tests
5.1 General
Compliance with the specification requirements shall be verified by carrying out tests selected
from Clause 5. It is not intended that all tests be carried out in all cases, and Annex B provides
guidance on the selection of tests. The tests to be applied and the frequency of testing shall be
agreed between the customer and supplier.
Some of the following tests can be performed on a short sample length of cable which is still an
integral part of a longer length, thus making it possible to detect permanent changes in
attenuation. As a general requirement for the tests specified in this document, the spirit is to
keep "no change in attenuation" criteria at the end of each evaluation, although the parameters
specified in this document may be affected by measurement uncertainty arising either from
measurement errors or calibration errors. The optical total uncertainty of measurement for this
document shall be ±0,05 dB for singlemode fibres and ±0,2 dB for multimode fibres. Any
measured value within this range shall be considered as "no change in attenuation".
Cabled single-mode fibres are measured at 1 550 nm or 1 625 nm and shall be agreed between
the customer and supplier. Cabled multimode fibres are measured at 850 nm or 1 300 nm and
shall be agreed between the customer and supplier. Measurements shall be carried out
according to IEC 60793-1-40.
NOTE The optimized wavelength for multimode fibres A1-OM3 and A1-OM4 is 850 nm and for A1-OM5 fibre, the
targeted operational wavelength(s) is between 850 nm and 950 nm.
If loops are used within a test to fix the ends of a cable, the loop diameter shall be equal or
greater than the specified minimum cable bend diameter to avoid cable damage and excessive
mode filtering in multimode fibre.
Unless otherwise specified, all tests shall be carried out at expanded test conditions as
specified in IEC 60794-1-2.
5.2 Dimensions
The fibre dimensions and tolerances shall be checked in accordance with test method
IEC 60793‑1‑20 or IEC 60793‑1‑21. The diameter of the buffer and of the cable, as well as the
thickness of the sheath, shall be measured in accordance with the methods of IEC 60811-202
and IEC 60811-203.
The cable diameter tolera
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