SIST EN IEC 60794-4-20:2019

Optical fibre cables - Part 4-20: Sectional specification - Aerial optical cables along electrical power lines - Family specification for ADSS (all dielectric self-supported) optical cables (IEC 60794-4-20:2018)

This part of IEC 60794-4, which is a family specification, covers optical telecommunication
cables, commonly with single-mode fibres1 used primarily in overhead power lines
applications. The cables can also be used in other overhead utility networks, such as for
telephony or TV services. Requirements of the sectional specification IEC 60794-4 for aerial
optical cables along electrical power lines are applicable to cables covered by this document.
This document covers the construction, mechanical, electrical, and optical performance,
installation guidelines, acceptance criteria, test requirements, environmental considerations,
and accessories compatibility for an all dielectric, self-supporting fibre optic (ADSS) cable.
This document provides construction and performance requirements that ensure, within the
guidelines of this document, that the required mechanical integrity of the cable components as
well as optical fibre mechanical reliability and transmission parameters are maintained.
The ADSS cable consists of single mode optical fibres contained in one or more protective
dielectric fibre optic units surrounded by or attached to suitable dielectric strength members
and sheaths. The cable does not contain metallic components. An ADSS cable is designed to
meet the optical and mechanical requirements under different installation, operating and
environmental conditions and loadings, as described in Annex B.
This document excludes any "lashed" or "wrapped" OPAC cables included in IEC 60794-4.
Figure 8 aerial cables are also excluded; they are specified in IEC 60794-3-20.

Lichtwellenleiterkabel - Teil 4-20: Lichtwellenleiter-Luftkabel auf Starkstrom-Freileitungen - Familienspezifikation für ADSS-LWL-Kabel (dielektrische, selbsttragende LWL-Kabel) (IEC 60794-4-20:2018)

Câbles à fibres optiques - Partie 4-20: Spécification intermédiaire - Câbles optiques aériens le long des lignes électriques de puissance - Spécification de famille pour les câbles optiques autoporteurs entièrement diélectriques (ADSS) (IEC 60794-4-20:2018)

NEW!IEC 60794-4-20:2018 est disponible sous forme de IEC 60794-4-20:2018 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

L'IEC 60794-4-20:2018 couvre les câbles optiques de télécommunication généralement équipés de fibres unimodales, utilisés principalement dans des applications le long des lignes aériennes à haute tension. Les câbles peuvent également être utilisés dans d'autres réseaux de services aériens, tels que des services de téléphonie ou de télévision. Les exigences de la spécification intermédiaire IEC 60794-4 pour des câbles optiques aériens le long de lignes électriques de puissance sont applicables aux câbles couverts par le présent document. Le présent document couvre la construction, les performances mécaniques, électriques et optiques, les lignes directrices relatives à l'installation, les critères d'acceptation, les exigences relatives aux essais, les considérations sur l'environnement et la compatibilité des accessoires pour câble fibronique autoporteur entièrement diélectrique (ADSS: all dielectric self-supporting). Le présent document fournit des exigences de performances et de construction qui garantissent, par les lignes directrices du présent document, que sont maintenus l'intégrité mécanique exigée des composants du câble ainsi que les paramètres de transmission et la fiabilité mécanique des fibres optiques. Le câble ADSS est constitué de fibres optiques unimodales contenues dans une ou plusieurs unités fibroniques diélectriques de protection entourées de, ou fixées à des gaines et des éléments de rigidité diélectrique appropriée. Le câble ne contient pas de composants métalliques. Un câble ADSS est conçu pour satisfaire aux exigences mécaniques et optiques dans différentes conditions d’installations, de fonctionnement et d'environnement et pour différentes charges, comme cela est décrit à l'Annexe B.AnchorAnchorAnchorAnchor Le présent document exclut les câbles OPAC "lacés" ou "enroulés" inclus dans l'IEC 60794-4. Les câbles aériens figure-8 sont également exclus; ils sont spécifiés dans l'IEC 60794‑3-20. Cette deuxième édition annule et remplace la première édition parue en 2012 dont elle constitue une révision technique. La présente édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- le présent document a été simplifié par établissement de correspondances avec les normes IEC 60794-1-1, IEC 60794-4 (toutes les parties) et IEC 60794-1-2;
- la référence au tableau MICE a été supprimée;
- l'exemple de méthode d'essai pour un environnement particulier à l'Annexe C a été supprimé;
- la méthode d'essai de fluage a été mise à jour à l'Annexe E.
Mots-clés: câbles optiques de télécommunication, lignes aériennes à haute tension

Optični kabli - 4-20. del: Področna specifikacija - Nadzemni optični kabli vzdolž elektroenergetskih vodov - Skupinska specifikacija za ADSS (dielektrične samonosne) optične kable (IEC 60794-4-20:2018)

Ta del standarda IEC 60794-4, ki je skupinska specifikacija, zajema optične telekomunikacijske kable, običajno z enorodnimi vlakni (1) za uporabo predvsem v nadzemnih elektroenergetskih vodih. Kabli se lahko uporabljajo tudi v drugih nadzemnih distribucijskih omrežjih, npr. za telefonske ali televizijske storitve. Zahteve področne specifikacije IEC 60794-4 za nadzemne optične kable vzdolž elektroenergetskih vodov se uporabljajo za kable iz tega dokumenta.
Ta dokument določa izdelavo, mehansko, električno in optično zmogljivost, smernice za namestitev, merila sprejemljivosti, preskusne zahteve, okoljske pomisleke ter skladnost pripomočkov za dielektrične samonosne (ADSS) optične kable.
Ta dokument določa zahteve glede zasnove in zmogljivosti, ki v okviru smernic tega dokumenta zagotavljajo vzdrževanje ustrezne mehanske stabilnosti sestavnih delov kabla ter mehanske zanesljivosti optičnih vlaken in optičnega prenosa.
Kabel ADSS je sestavljen iz enorodnih optičnih vlaken v eni ali več zaščitnih dielektričnih optičnih enotah, ki so pritrjene na dele in plašče ustrezne dielektrične trdnosti ali so v njihovi bližini. Kabel nima kovinskih delov. Kabel ADSS je izdelan tako, da izpolnjuje optične in mehanske zahteve različnih napeljav, vzdrži delovne in okoljske pogoje ter obremenitve, kot je opisano v dodatku B.
Ta dokument ne zajema »povezanih« ali »ovitih« kablov OPAC, ki so vključeni v standardu IEC 60794-4.
Izključeni so tudi nadzemni kabli v obliki osmice; določeni so v standardu IEC 60794-3-20.

General Information

• Status: Published
• Publication Date: 25-Nov-2018
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 09-Nov-2018
• Due Date: 14-Jan-2019
• Completion Date: 26-Nov-2018
• Ref Project: EN IEC 60794-4-20:2018 - Optical fibre cables - Part 4-20: Sectional specification - Aerial optical cables along electrical power lines - Family specification for ADSS (all dielectric self-supported) optical cables

Relations

• Revised: SIST EN 60794-4-20:2013 - Optical fibre cables - Part 4-20: Aerial optical cables along electrical power lines - Family specification for ADSS (All Dielectric Self Supported) optical cables (IEC 60794-4-20:2012)
• Effective Date: 20-Dec-2016
• Replaces: SIST EN 60794-4-20:2013 - Optical fibre cables - Part 4-20: Aerial optical cables along electrical power lines - Family specification for ADSS (All Dielectric Self Supported) optical cables (IEC 60794-4-20:2012)
• Effective Date: 06-Nov-2018
• Replaces: SIST EN 60794-4-20:2013 - Optical fibre cables - Part 4-20: Aerial optical cables along electrical power lines - Family specification for ADSS (All Dielectric Self Supported) optical cables (IEC 60794-4-20:2012)
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60794-4-20:2019
01-januar-2019
1DGRPHãþD
SIST EN 60794-4-20:2013
2SWLþQLNDEOLGHO3RGURþQDVSHFLILNDFLMD1DG]HPQLRSWLþQLNDEOLY]GROå
HOHNWURHQHUJHWVNLKYRGRY6NXSLQVNDVSHFLILNDFLMD]D$'66GLHOHNWULþQH
VDPRQRVQHRSWLþQHNDEOH,(&
Optical fibre cables - Part 4-20: Sectional specification - Aerial optical cables along
electrical power lines - Family specification for ADSS (all dielectric self-supported) optical
cables (IEC 60794-4-20:2018)
Lichtwellenleiterkabel - Teil 4-20: Lichtwellenleiter-Luftkabel auf Starkstrom-Freileitungen
- Familienspezifikation für ADSS-LWL-Kabel (dielektrische, selbsttragende LWL-Kabel)
(IEC 60794-4-20:2018)
Câbles à fibres optiques - Partie 4-20: Spécification intermédiaire - Câbles optiques
aériens le long des lignes électriques de puissance - Spécification de famille pour les
câbles optiques autoporteurs entièrement diélectriques (ADSS) (IEC 60794-4-20:2018)
Ta slovenski standard je istoveten z: EN IEC 60794-4-20:2018
ICS:
33.180.10 2SWLþQDYODNQDLQNDEOL Fibres and cables
SIST EN IEC 60794-4-20:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60794-4-20:2019

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SIST EN IEC 60794-4-20:2019


EUROPEAN STANDARD EN IEC 60794-4-20

NORME EUROPÉENNE

EUROPÄISCHE NORM
November 2018
ICS 33.180.10 Supersedes EN 60794-4-20:2012
English Version
Optical fibre cables - Part 4-20: Sectional specification - Aerial
optical cables along electrical power lines - Family specification
for ADSS (all dielectric self-supported) optical cables
(IEC 60794-4-20:2018)
Câbles à fibres optiques - Partie 4-20: Spécification Lichtwellenleiterkabel - Teil 4-20: Lichtwellenleiter-Luftkabel
intermédiaire - Câbles optiques aériens le long des lignes auf Starkstrom-Freileitungen - Familienspezifikation für
électriques de puissance - Spécification de famille pour les ADSS-LWL-Kabel (dielektrische, selbsttragende LWL-
câbles optiques autoporteurs entièrement diélectriques Kabel)
(ADSS) (IEC 60794-4-20:2018)
(IEC 60794-4-20:2018)
This European Standard was approved by CENELEC on 2018-10-02. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60794-4-20:2018 E

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SIST EN IEC 60794-4-20:2019
EN IEC 60794-4-20:2018 (E)
European foreword
The text of document 86A/1867/FDIS, future edition 2 of IEC 60794-4-20, 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 60794-4-20:2018.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-07-02
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-10-02
document have to be withdrawn
This document supersedes EN 60794-4-20:2012.
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 60794-4-20:2018 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 60060-1:2010 NOTE Harmonized as EN 60060-1:2010 (not modified)
IEC 60794-1-2 NOTE Harmonized as EN 60794-1-2
IEC 60794-3-20 NOTE Harmonized as EN 60794-3-20
IEC 60794-4 series NOTE Harmonized as EN 60794-4 series
IEC 61395 NOTE Harmonized as EN 61395
IEC 61935 series NOTE Harmonized as EN 61935 series

2

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SIST EN IEC 60794-4-20:2019
EN IEC 60794-4-20:2018 (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 60793-2 -  Optical fibres - Part 2: Product EN 60793-2 -
specifications - General
IEC 60793-2-50 -  Optical fibres - Part 2-50: Product EN 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 60794-1-21 2015 Optical fibre cables - Part 1-21: Generic EN 60794-1-21 2015
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 60794-4 -  Optical fibre cables - Part 4: Sectional EN IEC 60794-4 -
specification - Aerial optical cables along
electrical power lines
ISO 9001 -  Quality management systems - EN ISO 9001 -
Requirements

3

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SIST EN IEC 60794-4-20:2019

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SIST EN IEC 60794-4-20:2019




IEC 60794-4-20

®


Edition 2.0 2018-08




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE

colour

inside










Optical fibre cables –

Part 4-20: Sectional specification – Aerial optical cables along electrical power

lines – Family specification for ADSS (all dielectric self-supported) optical cables




Câbles à fibres optiques –

Partie 4-20: Spécification intermédiaire – Câbles optiques aériens le long des


lignes électriques de puissance – Spécification de famille pour les câbles

optiques autoporteurs entièrement diélectriques (ADSS)












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

INTERNATIONALE




ICS 33.180.10 ISBN 978-2-8322-5907-8




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 60794-4-20:2019
– 2 – IEC 60794-4-20:2018 © IEC 2018
CONTENTS
FOREWORD. 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 7
4 Optical fibres . 7
5 Cable elements . 7
6 Optical fibre cable constructions . 7
6.1 General . 7
6.2 Cable protection elements . 7
7 Main requirements for installation and operating conditions . 8
8 Cable design considerations . 8
9 Cable tests . 9
9.1 General . 9
9.2 Tensile performance . 9
9.2.1 General . 9
9.2.2 Family requirement . 9
9.2.3 Test conditions . 9
9.3 Sheave test . 9
9.3.1 General . 9
9.3.2 Family requirement . 9
9.3.3 Test conditions . 9
9.4 Repeated bending . 10
9.4.1 General . 10
9.4.2 Family requirements . 10
9.4.3 Test conditions . 10
9.5 Impact . 10
9.5.1 General . 10
9.5.2 Family requirements . 10
9.5.3 Test conditions . 10
9.6 Crush . 10
9.6.1 General . 10
9.6.2 Test requirements . 11
9.6.3 Test conditions . 11
9.7 Torsion . 11
9.7.1 General . 11
9.7.2 Test requirements . 11
9.8 Aeolian vibration test . 11
9.8.1 General . 11
9.8.2 Family requirements . 11
9.8.3 Test conditions . 11
9.8.4 Parameters to be reported . 11
9.9 Low frequency vibration test (galloping test) . 12
9.9.1 General . 12
9.9.2 Family requirements . 12
9.9.3 Test conditions . 12

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SIST EN IEC 60794-4-20:2019
IEC 60794-4-20:2018 © IEC 2018 – 3 –
9.10 Temperature cycling . 12
9.10.1 General . 12
9.10.2 Family requirements . 12
9.10.3 Test conditions . 12
9.11 Water penetration . 13
9.12 Cable UV resistance . 13
9.13 Tracking and erosion resistance test . 13
9.14 Creep . 13
9.15 Fitting compatibility . 14
10 Quality assurance . 14
Annex A (informative) Packaging and marking . 15
Annex B (informative) Installation considerations for ADSS cables . 16
Annex C (informative) Electrical test (tracking) . 18
C.1 General . 18
C.2 Option C2 – Sheath material qualification . 18
C.2.1 Overview . 18
C.2.2 Test arrangements . 18
C.2.3 Test procedure . 19
C.2.4 Requirements . 19
C.3 Option C3 – Pollution level and tracking resistance . 19
C.3.1 Overview . 19
C.3.2 Test setup . 20
C.3.3 Test method . 22
C.3.4 Overview of pollution model and electrical test . 22
Annex D (informative) All dielectric self-supported (ADSS) cables to be used in
overhead power lines (blank detail specification) . 24
Bibliography . 26

Figure B.1 – Example of different span lengths allowed for the same cable, depending
on sag variation . 17
Figure C.1 – Electric scheme for the test . 20
Figure C.2 – Foils of the electrodes . 20
Figure C.3 – Nozzle . 21
Figure C.4 – Details for the spraying . 21
Figure C.5 – Distributed element model with dry band arc gap . 23
Figure C.6 – Thevenin equivalent circuit . 23

Table 1 – Cable design characteristics . 8
Table 2 – Optional parameters (if required by customer) . 8
Table C.1 – R and C values for different pollution index values . 22
eq eq
Table D.1 – Blank detail specification . 24

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SIST EN IEC 60794-4-20:2019
– 4 – IEC 60794-4-20:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

OPTICAL FIBRE CABLES –

Part 4-20: Sectional specification – Aerial optical cables along
electrical power lines – Family specification for ADSS
(all dielectric self-supported) 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) 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 60794-4-20 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 2012 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) this document has been streamlined by cross-referencing IEC 60794-1-1,
IEC 60794-4 (all parts) and IEC 60794-1-2;
b) reference to the MICE table has been deleted;
c) the example of test method for particular environment in Annex C has been deleted;

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SIST EN IEC 60794-4-20:2019
IEC 60794-4-20:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1867/FDIS 86A/1876/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 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 "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 60794-4-20:2019
– 6 – IEC 60794-4-20:2018 © IEC 2018
OPTICAL FIBRE CABLES –

Part 4-20: Sectional specification – Aerial optical cables along
electrical power lines – Family specification for ADSS
(all dielectric self-supported) optical cables



1 Scope
This part of IEC 60794-4, which is a family specification, covers optical telecommunication
1
cables, commonly with single-mode fibres used primarily in overhead power lines
applications. The cables can also be used in other overhead utility networks, such as for
telephony or TV services. Requirements of the sectional specification IEC 60794-4 for aerial
optical cables along electrical power lines are applicable to cables covered by this document.
This document covers the construction, mechanical, electrical, and optical performance,
installation guidelines, acceptance criteria, test requirements, environmental considerations,
and accessories compatibility for an all dielectric, self-supporting fibre optic (ADSS) cable.
This document provides construction and performance requirements that ensure, within the
guidelines of this document, that the required mechanical integrity of the cable components as
well as optical fibre mechanical reliability and transmission parameters are maintained.
The ADSS cable consists of single mode optical fibres contained in one or more protective
dielectric fibre optic units surrounded by or attached to suitable dielectric strength members
and sheaths. The cable does not contain metallic components. An ADSS cable is designed to
meet the optical and mechanical requirements under different installation, operating and
environmental conditions and loadings, as described in Annex B.
This document excludes any "lashed" or "wrapped" OPAC cables included in IEC 60794-4.
Figure 8 aerial cables are also excluded; they are specified in IEC 60794-3-20.
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 60793-2, Optical fibres – Part 2: Product specifications – General
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: Generic specification – General
IEC 60794-1-21:2015, Optical fibre cables – Part 1-21: Generic specification – Basic optical
cable test procedures – Mechanical test methods
IEC 60794-1-22, Optical fibre cables – Part 1-22: Generic specification – Basic optical cable
test procedures – Environmental test methods
___________
1
 In some particular situations in the electrical industry, short overhead links can be also designed with
multimode fibres.

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SIST EN IEC 60794-4-20:2019
IEC 60794-4-20:2018 © IEC 2018 – 7 –
IEC 60794-4, Optical fibre cables – Part 4: Sectional specification – Aerial optical cables
along electrical power lines
ISO 9001, Quality management systems – Requirements
3 Terms, definitions and abbreviated terms
For the purposes of this document, the terms, definitions and abbreviated terms given in
IEC 60794-1-1 and IEC 60794-4 apply.
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4 Optical fibres
Single-mode optical fibres shall be used that meet the requirements of IEC 60793-2-50. Other
types of fibre can be agreed upon between the customer and the supplier; such fibre shall
conform to IEC 60793-2. The cabled fibre shall conform to IEC 60794-4.
5 Cable elements
Refer to the relevant parts of the sectional specification IEC 60794-4.
6 Optical fibre cable constructions
6.1 General
The construction and characteristics of cable elements shall conform to IEC 60794-4. The
cable shall not contain any metallic material.
6.2 Cable protection elements
In addition to the optical unit, the cable construction may consist of the following.
a) The outer sheath shall be a weather-resistant type material. In certain conditions, it shall
be necessary to consider the use of a tracking-resistant sheath.
b) An ADSS cable shall contain self-supported systems that are integral to the cable. The
purpose of the support system is to ensure that the cable meets the optical requirements
under specified installation conditions, temperatures, and environmental loading for its
whole operating design life.
c) The basic annular construction may have strength yarns (e.g. aramid yarns) or other
dielectric strands or dielectric rods as a support structure. A single central dielectric shaft,
channelled to accommodate the optical elements, is also accepted.
d) The cable shall be designed such that fibre strain does not exceed the limit allowed by the
cable manufacturer under design tension limits of the cable (MAT). Maximum allowable
fibre strain under MAT condition shall be ≤ 0,2 % for 0,69 GPa proof-tested fibres.
NOTE In some countries, a special requirement of shotgun resistance can be specified for aerial cables. ADSS
cables covered by this document are not designed for such a condition. Cables with reinforced textile protection
could still meet the dielectric condition, but the increase in diameter and weight would make necessary a significant
enhancement of the tensile
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