EN IEC 60794-2-20:2025

Optical fibre cables - Part 2-20: Indoor cables - Family specification for multi-fibre optical cables

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

Câbles à fibres optiques - Partie 2-20 : Câbles intérieurs - Spécification de famille pour les câbles optiques multifibres

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)

General Information

• Status: Published
• Publication Date: 30-Jan-2025
• ICS: 33.180.01 - Fibre optic systems in general
• 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: 31-Jan-2025
• Due Date: 31-Jan-2025
• Completion Date: 31-Jan-2025
• Ref Project: SIST EN IEC 60794-2-20:2025 - Optical fibre cables - Part 2-20: Indoor cables - Family specification for multi-fibre optical cables (IEC 60794-2-20:2024)

Relations

• Replaces: EN 60794-2-20:2014 - Optical fibre cables - Part 2-20: Indoor cables - Family specification for multi-fibre optical cables
• Effective Date: 26-Apr-2022

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 .
...