SIST EN IEC 60794-2-20:2025
(Main)Optical fibre cables - Part 2-20: Indoor cables - Family specification for multi-fibre optical cables (IEC 60794-2-20:2024)
Optical fibre cables - Part 2-20: Indoor cables - Family specification for multi-fibre optical cables (IEC 60794-2-20:2024)
IEC 60794-2-20:2024 is part of a family specification covering multi-fibre optical cables for indoor use. The requirements of the sectional specification IEC 60794-2 are applicable to cables covered by this document. Annex B contains a blank detail specification and general guidance in case the cables are intended to be used in installations governed by the MICE table of ISO/IEC 11801-1. This fourth edition cancels and replaces the third edition published in 2013. 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 update of parameters and requirements for mechanical tests and environmental tests, maintaining alignment with additional relevant standards in the IEC 60794-2 series;
c) addition of cabled fibre attenuation requirements;
d) addition of cable design examples.
This document is to be used in conjunction with IEC 60794-1-1:2023, IEC 60794-1-2:2021, IEC 60794‑1‑21:2015 and IEC 60794‑1‑21:2015/AMD:2020, IEC 60794-1-22:2017, IEC 60794‑1-23:2019 and IEC 60794‑2:2017.
Lichtwellenleiterkabel - Teil 2-20: LWL-Innenkabel - Familienspezifikation für Mehrfaser-Lichtwellenleiterkabel (IEC 60794-2-20:2024)
Câbles à fibres optiques - Partie 2-20: Câbles intérieurs - Spécification de famille pour les câbles optiques multifibres (IEC 60794-2-20:2024)
IEC 60794-2-20:2024 fait partie une spécification de famille qui couvre les câbles optiques multifibres pour utilisation intérieure. Les exigences de la spécification intermédiaire IEC 60794-2 sont applicables aux câbles couverts par le présent document. L’Annexe B contient une spécification particulière-cadre et des recommandations générales dans le cas où les câbles sont destinés à être utilisés dans des installations régies par la matrice MICE de l’ISO/IEC 11801-1.
Cette quatrième édition annule et remplace la troisième édition parue en 2013. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) mise à jour des références normatives;
b) révision-mise à jour des paramètres et des exigences pour les essais mécaniques et les essais d’environnement, en conservant l’alignement avec les normes pertinentes supplémentaires de la série IEC 60794-2;
c) ajout des exigences relatives à l’affaiblissement des fibres câblées;
d) ajout d’exemples de conceptions de câble.
Le présent document est à utiliser conjointement avec l’IEC 60794-1-1:2023, l’IEC 60794‑1‑2:2021, l’IEC 60794-1-21:2015 associée à l’IEC 60794-1-21:2015/AMD:2020, l’IEC 60794-1-22:2017, l’IEC 60794-1-23:2019 et l’IEC 60794-2:2017.
Optični kabli - 2-20. del: Notranji kabli - Skupinska specifikacija za distribucijske kable z več optičnimi vlakni (IEC 60794-2-20:2024)
Standard IEC 60794-2-20:2024 je del skupinske specifikacije, ki zajema distribucijske kable z več optičnimi vlakni za notranjo uporabo. Zahteve področne specifikacije IEC 60794-2 se uporabljajo za kable, ki jih zajema ta dokument. Dodatek B vsebuje okvirno podrobno specifikacijo in splošna navodila za kable, ki so namenjeni uporabi v napravah iz preglednice MICE standarda ISO/IEC 11801-1. Četrta izdaja razveljavlja in nadomešča tretjo izdajo, objavljeno leta 2013. Ta izdaja je tehnično popravljena izdaja. Ta izdaja v primerjavi s prejšnjo vključuje naslednje pomembne tehnične spremembe:
a) zveze s standardi so bile posodobljene;
b) parametri in zahteve za mehanske oziroma okoljske preskuse so bili pregledani ter posodobljeni tako, da so usklajeni z dodatnimi ustreznimi standardi v skupini standardov IEC 60794-2;
c) dodane so bile zahteve v zvezi slabljenjem kabelskih vlaken;
d) dodani so bili primeri zasnov kablov.
Ta dokument je treba uporabljati v povezavi s standardi IEC 60794-1-1:2023, IEC 60794-1-2:2021, IEC 60794‑1‑21:2015, IEC 60794‑1‑21:2015/AMD:2020, IEC 60794-1-22:2017, IEC 60794‑1-23:2019 in IEC 60794‑2:2017.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2025
Optični kabli - 2-20. del: Notranji kabli - Skupinska specifikacija za distribucijske
kable z več optičnimi vlakni (IEC 60794-2-20:2024)
Optical fibre cables - Part 2-20: Indoor cables - Family specification for multi-fibre optical
cables (IEC 60794-2-20:2024)
Lichtwellenleiterkabel - Teil 2-20: LWL-Innenkabel - Familienspezifikation für Mehrfaser-
Lichtwellenleiterkabel (IEC 60794-2-20:2024)
Câbles à fibres optiques - Partie 2-20: Câbles intérieurs - Spécification de famille pour
les câbles optiques multifibres (IEC 60794-2-20:2024)
Ta slovenski standard je istoveten z: EN IEC 60794-2-20:2025
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.
EUROPEAN STANDARD EN IEC 60794-2-20
NORME EUROPÉENNE
EUROPÄISCHE NORM January 2025
ICS 33.180.01 Supersedes EN 60794-2-20:2014
English Version
Optical fibre cables - Part 2-20: Indoor cables - Family
specification for multi-fibre optical cables
(IEC 60794-2-20:2024)
Câbles à fibres optiques - Partie 2-20 : Câbles intérieurs - Lichtwellenleiterkabel - Teil 2-20: LWL-Innenkabel -
Spécification de famille pour les câbles optiques multifibres Familienspezifikation für Mehrfaser-Lichtwellenleiterkabel
(IEC 60794-2-20:2024) (IEC 60794-2-20:2024)
This European Standard was approved by CENELEC on 2025-01-15. 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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60794-2-20:2025 E
European foreword
The text of document 86A/2431/FDIS, future edition 4 of IEC 60794-2-20, 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 60794-2-20:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-01-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-01-31
document have to be withdrawn
This document supersedes EN 60794-2-20:2014 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.
This document is read in conjunction with EN IEC 60794-1-1:2023, .EN IEC 60794-1-2:2021,
EN 60794-1-21:2015 , EN IEC 60794-1-22:2018, EN IEC 60794-1-23:2019, and EN 60794-2:2017.
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 60794-2-20:2024 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 60654 series NOTE Approved as EN 60654 series
IEC 60721-1 NOTE Approved as EN 60721-1
IEC 60721-3-3 NOTE Approved as EN IEC 60721-3-3
IEC 60794-1-3 NOTE Approved as EN 60794-1-3
IEC 60794-1-21 NOTE Approved as EN 60794-1-21
IEC 61000-6-2 NOTE Approved as EN IEC 61000-6-2
IEC 61753-1 NOTE Approved as EN IEC 61753-1
IEC 61918 NOTE Approved as EN IEC 61918
IEC 60794-2 series NOTE Approved as EN IEC 60794-2 series
As impacted by EN 60794-1-21:2015/A1:2020.
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 60304 - Standard colours for insulation for low- HD 402 S2 -
frequency cables and wires
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 60793-1-40 - Optical fibres - Part 1-40: Attenuation EN IEC 60793-1-40 -
measurement methods
IEC 60793-1-44 - Optical fibres - Part 1-44: Measurement EN IEC 60793-1-44 -
methods and test procedures - Cut-off
wavelength
IEC 60793-1-46 - Optical fibres - Part 1-46: Measurement EN IEC 60793-1-46 -
methods and test procedures - Monitoring
of changes in attenuation
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 2023 Optical fibre cables - Part 1-1: Generic EN IEC 60794-1-1 2023
specification - General
IEC 60794-1-2 2021 Optical fibre cables - Part 1-2: Generic EN IEC 60794-1-2 2021
specification - Basic optical cable test
procedures - General guidance
IEC 60794-1-21 2015 Optical fibre cables - Part 1-21: Generic EN 60794-1-21 2015
specification - Basic optical cable test
procedures - Mechanical tests methods
+ A1 2020 + A1 2020
Publication Year Title EN/HD Year
IEC 60794-1-22 2017 Optical fibre cables - Part 1-22: Generic EN IEC 60794-1-22 2018
specification - Basic optical cable test
procedures - Environmental test methods
IEC 60794-1-23 2019 Optical fibre cables - Part 1-23: Generic EN IEC 60794-1-23 2019
specification - Basic optical cable test
procedures - Cable element test methods
IEC 60794-1-31 - Optical fibre cables - Part 1-31: Generic EN IEC 60794-1-31 -
specification - Optical cable elements -
Optical fibre ribbon
IEC 60794-2 2017 Optical fibre cables - Part 2: Indoor cables EN 60794-2 2017
- 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 60794-2-20 ®
Edition 4.0 2024-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 2-20: Indoor cables – Family specification for multi-fibre optical cables
Câbles à fibres optiques –
Partie 2-20: Câbles intérieurs – Spécification de famille pour les câbles optiques
multifibres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 ISBN 978-2-8327-0082-2
– 2 – IEC 60794-2-20:2024 © IEC 2024
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 . 7
4.3 Buffer . 8
4.4 Ruggedized fibre . 8
4.5 Slotted core . 8
4.6 Tube . 8
4.7 Stranded tube . 8
4.8 Ribbon structure . 8
4.9 Strength and anti-buckling members . 9
4.10 Ripcord . 9
4.11 Sheath . 9
4.12 Sheath marking . 9
4.13 Identification . 9
4.14 Examples of cable constructions . 9
5 Tests . 9
5.1 General . 9
5.2 Dimensions . 10
5.3 Mechanical requirements . 10
5.3.1 Tensile performance . 10
5.3.2 Crush . 10
5.3.3 Impact . 10
5.3.4 Bending . 11
5.3.5 Repeated bending . 11
5.3.6 Bending under tension . 11
5.3.7 Bending at low temperature . 11
5.3.8 Flexing . 11
5.3.9 Torsion . 12
5.3.10 Cable kink . 12
5.4 Environmental requirements – Temperature cycling . 12
5.5 Transmission requirements . 13
5.5.1 General . 13
5.5.2 Single-mode optical fibres . 13
5.5.3 Single-mode dispersion unshifted (B-652.B) optical fibre . 13
5.5.4 Single-mode dispersion unshifted (B-652.D) optical fibre . 13
5.5.5 Single-mode (B-657.A) optical fibre . 14
5.5.6 Single-mode (B-657.B) optical fibre . 14
5.5.7 Multimode optical fibres . 14
5.5.8 Multimode (A1-OM1 to A1-OM5) optical fibres . 15
5.6 Fire performance . 15
Annex A (informative) Examples of cable constructions . 16
Annex B (informative) Family specification for multi-fibre optical cables – Blank detail
specification and minimum requirements . 21
IEC 60794-2-20:2024 © IEC 2024 – 3 –
B.1 Blank detail specification . 21
B.1.1 General . 21
B.1.2 Cable description . 21
B.1.3 Cable element . 22
B.1.4 Cable construction . 23
B.1.5 Installation and operating conditions . 24
B.1.6 Mechanical and environmental tests . 24
B.2 Cables subject to the MICE environmental classification (ISO/IEC 11801-1
and related standards) . 25
Bibliography . 26
Figure A.1 – Example of cross-section of a 12-fibre cable . 16
Figure A.2 – Example of cross-section of a 36-fibre cable . 16
Figure A.3 – Example of cross-section of a 6-fibre break-out cable . 17
Figure A.4 – Example of cross-section of a 24-fibre break-out cable . 17
Figure A.5 – Example of cross-section of a slotted core type indoor cable with 4-fibre
ribbons . 18
Figure A.6 – Example of cross-section of an SZ (reverse oscillating lay) slotted core
type indoor cable with 2-fibre ribbons . 18
Figure A.7 – Example of cross-section of an SZ (reverse oscillating lay) slotted core
type indoor cable with 4-fibre bundles . 19
Figure A.8 – Example of multi-fibre unitube cable . 19
Figure A.9 – Example of multi-fibre cable . 19
Figure A.10 – Example of a retractable (micro-module) cable . 20
Table 1 – Dimensions of buffered fibres . 8
Table 2 – Typical values for temperature cycling . 12
Table 3 – Common single-mode optical fibre requirements . 13
Table 4 – Cabled fibre attenuation requirements for B-652.B optical fibre . 13
Table 5 – Cabled fibre attenuation requirements for B-652.D optical fibre . 14
Table 6 – Cabled fibre attenuation requirements for B-657.A optical fibre . 14
Table 7 – Cabled fibre attenuation requirements for B-657.B optical fibre . 14
Table 8 – Common multimode optical fibre requirements . 14
Table 9 – Cabled fibre attenuation requirements for A1-OM1 to A1-OM5 optical fibres . 15
Table B.1 – Cable description . 21
Table B.2 – Cable element . 22
Table B.3 – Cable construction . 23
Table B.4 – Installation and operating conditions . 24
Table B.5 – Tests applicable . 24
– 4 – IEC 60794-2-20:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 2-20: Indoor cables –
Family specification for multi-fibre optical cables
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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60794-2-20 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical
committee 86: Fibre optics. It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2013. 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 update of parameters and requirements for mechanical tests and environmental
tests, maintaining alignment with additional relevant standards in the IEC 60794-2 series;
c) addition of cabled fibre attenuation requirements;
IEC 60794-2-20:2024 © IEC 2024 – 5 –
d) addition of cable design examples.
This document is to be used in conjunction with IEC 60794-1-1:2023, IEC 60794-1-2:2021,
IEC 60794-1-21:2015 and IEC 60794-1-21:2015/AMD:2020, IEC 60794-1-22:2017,
IEC 60794-1-23:2019 and IEC 60794-2:2017.
The text of this International Standard is based on the following documents:
Draft Report on voting
86A/2431/FDIS 86A/2520/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 parts of 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, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document 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 60794-2-20:2024 © IEC 2024
OPTICAL FIBRE CABLES –
Part 2-20: Indoor cables –
Family specification for multi-fibre optical cables
1 Scope
This part of IEC 60794 is a family specification covering multi-fibre optical cables for indoor
use. The requirements of the sectional specification IEC 60794-2 are applicable to cables
covered by this document. Annex B contains a blank detail specification and general guidance
in case the cables are intended to be used in installations governed by the MICE table of
ISO/IEC 11801-1.
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 60304, Standard colours for insulation for low-frequency cables and wires
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 60793-1-40, Optical fibres – Part 1-40: Attenuation measurement methods
IEC 60793-1-44, Optical fibres – Part 1-44: Measurement methods and test procedures – Cut-
off wavelength
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 60794-1-1:2023, Optical fibre cables – Part 1-1: Generic specification – General
...
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