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)

This part of IEC 60794, which is a family specification, covers optical telecommunication cables, commonly with single-mode fibres to be used primarily in overhead power lines applications. The cable may 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 standard. NOTE In some particular situations in the electrical industry, short overhead links can be also designed with multimode fibres. 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 types of installation, operating and environmental conditions and loading, as described in Annex B. This standard 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. The standard provides both construction and performance requirements that ensure, within the guidelines of this standard, that the mechanical capabilities of the cable components and maintenance of optical fibre integrity and optical transmissions are proper. This standard excludes any “lashed” or “wrapped” OPAC cables. Cables intended for installation in conformity with ISO/IEC 24702 and related standards may require the specification of additional tests to ensure their suitability in the applicable environments defined by the mechanical, ingress, climatic and chemical, and electromagnetic (MICE) classification. These tests are outside of the scope of IEC 60794 cable specifications, and MICE criteria are not part of the requirements for IEC 60794 specifications. The MICE tests may be the same as, similar to, or substantially different from, the tests required by IEC 60794 specifications. Cables manufactured per IEC 60794 specifications may or may not meet the MICE criteria. For supplemental discussion, see IEC/TR 62362.

Lichtwellenleiterkabel - Teil 4-20: Lichtwellenleiter-Luftkabel auf Starkstrom-Freileitungen - Familienspezifikation für ADSS-LWL-Kabel (dielektrische, selbsttragende LWL-Kabel) (IEC 60794-4-20:2012)

Câbles à fibres optiques - Partie 4-20: Câbles optiques aériens installés le long des lignes d’énergie électrique - Spécification de famille pour les câbles optiques autoportés par le diélectrique (ADSS) (CEI 60794-4-20:2012)

Optični kabli - 4-20. del: Nadzemni optični kabli vzdolž elektroenergetskih vodov - Skupinska specifikacija za ADSS (dielektrične samonosne) optične kable (IEC 60794-4-20:2012)

Ta del standarda IEC 60794, ki je skupinska specifikacija, zajema optične telekomunikacijske kable, običajno z enomodnimi vlakni za uporabo predvsem v nadzemnih elektroenergetskih vodih. Kabel se lahko uporablja 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 standarda. OPOMBA: za nekatere posebne primere v električni industriji so lahko nadzemni vodi izdelani tudi z večmodnimi vlakni. Kabel ADSS je sestavljen iz enomodnih optičnih vlaken, ki so v eni ali več zaščitnih dielektričnih optičnih enotah, ki jih obkroža ali pa so pritrjene na dele ustrezne dielektrične trdnosti in plašče. Kabel nima kovinskih delov. Kabel ADSS je izdelan tako, da izpolnjuje optične in mehanske zahteve različnih vrst namestitve, vzdrži delovne in okoljske pogoje ter obremenitve, kot je opisano v prilogi B. Ta standard določa izdelavo, mehansko, električno in optično zmogljivost, smernice za namestitev, kriterije sprejemljivosti, preskusne zahteve, okoljske pomisleke ter skladnost pripomočkov za dielektrične samonosne (ADSS) optične kable. Standard določa zahteve glede zasnove in zmogljivosti, ki v okviru smernic tega standarda zagotavljajo ustrezne mehanske lastnosti sestavnih delov kabla ter pravilno vzdrževanje integritete optičnih vlaken in optičnega prenosa. Standard ne zajema »povezanih« ali »ovitih« kablov OPAC. Uporaba kablov, ki se nameščajo v skladu s standardom ISO/IEC 24702 in povezanimi standardi, lahko zahteva specifikacije dodatnih preskusov, da se zagotovi njihova primernost za uporabo v okoljih, ki so opredeljena z mehansko, vdorno, podnebno, kemično in elektromagnetno (MICE) razvrstitvijo. Ti preskusi ne spadajo na področje uporabe specifikacij za kable IEC 60794, kriteriji MICE pa niso del zahtev za specifikacije IEC 60794. Preskusi MICE so lahko enaki kot preskusi, ki jih zahtevajo specifikacije IEC 60794, lahko so jim podobni ali pa se od njih znatno razlikujejo. Kabli, izdelani v skladu s specifikacijami IEC 60794, lahko kriterije MICE izpolnjujejo ali ne izpolnjujejo. Za dodatno razpravo glejte standard IEC/TR 62362.

General Information

• Status: Withdrawn
• Publication Date: 08-Jan-2013
• Withdrawal Date: 12-Oct-2021
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 12-Oct-2021
• Due Date: 04-Nov-2021
• Completion Date: 13-Oct-2021
• Ref Project: EN 60794-4-20:2012 - Optical fibre cables - Part 4-20: Aerial optical cables along electrical power lines - Family specification for ADSS (All Dielectric Self Supported) optical cables

Relations

• Replaced By: 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)
• Effective Date: 06-Nov-2018
• Replaced By: 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)
• Effective Date: 07-Jun-2022
• Revised: 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)
• Effective Date: 20-Dec-2016

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60794-4-20:2013
01-februar-2013
2SWLþQLNDEOLGHO1DG]HPQLRSWLþQLNDEOLY]GROåHOHNWURHQHUJHWVNLKYRGRY
6NXSLQVNDVSHFLILNDFLMD]D$'66GLHOHNWULþQHVDPRQRVQHRSWLþQHNDEOH,(&

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)
Lichtwellenleiterkabel - Teil 4-20: Lichtwellenleiter-Luftkabel auf Starkstrom-Freileitungen
- Familienspezifikation für ADSS-LWL-Kabel (dielektrische, selbsttragende LWL-Kabel)
(IEC 60794-4-20:2012)
Câbles à fibres optiques - Partie 4-20: Câbles optiques aériens installés le long des
lignes d’énergie électrique - Spécification de famille pour les câbles optiques autoportés
par le diélectrique (ADSS) (CEI 60794-4-20:2012)
Ta slovenski standard je istoveten z: EN 60794-4-20:2012
ICS:
33.180.10 2SWLþQDYODNQDLQNDEOL Fibres and cables
SIST EN 60794-4-20:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60794-4-20:2013

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SIST EN 60794-4-20:2013

EUROPEAN STANDARD
EN 60794-4-20

NORME EUROPÉENNE
December 2012
EUROPÄISCHE NORM

ICS 33.180.10


English version


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)


Câbles à fibres optiques -  Lichtwellenleiterkabel -
Partie 4-20: Câbles optiques aériens Teil 4-20: Lichtwellenleiter-Luftkabel
installés le long des lignes d’énergie auf Starkstrom-Freileitungen -
électrique - Spécification de famille Familienspezifikation für ADSS-LWL-
pour les câbles optiques autoportés Kabel (dielektrische, selbsttragende
par le diélectrique (ADSS) LWL-Kabel)
(CEI 60794-4-20:2012) (IEC 60794-4-20:2012)



This European Standard was approved by CENELEC on 2012-11-29. 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60794-4-20:2012 E

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SIST EN 60794-4-20:2013
EN 60794-4-20:2012 - 2 -
Foreword
The text of document 86A/1467/FDIS, future edition 1 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 60794-4-20:2012.

The following dates are fixed:
(dop) 2013-08-29
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2015-11-29
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

Endorsement notice
The text of the International Standard IEC 60794-4-20:2012 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 Harmonised as EN 60060-1:2010 (not modified).
IEC 60794 Series NOTE Harmonised as 60794 Series (not modified).
IEC 60794-1-2X Series NOTE Harmonised as EN 60794-1-2X Series (not modified).
IEC 60794-3 NOTE Harmonised as EN 60794-3.
ISO 9001 NOTE Harmonised as EN ISO 9001.

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SIST EN 60794-4-20:2013
- 3 - EN 60794-4-20:2012
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60304 - Standard colours for insulation for low- HD 402 S2 -
frequency cables and wires


IEC 60793-1-40 - Optical fibres - EN 60793-1-40 -
Part 1-40: Measurement methods and test
procedures - Attenuation


IEC 60793-1-44 - Optical fibres - EN 60793-1-44 -
Part 1-44: Measurement methods and test
procedures - Cut-off wavelength


IEC 60793-1-48 - Optical fibres - EN 60793-1-48 -
Part 1-48: Measurement methods and test
procedures - Polarization mode dispersion


IEC 60793-2-50 - Optical fibres - EN 60793-2-50 -
Part 2-50: Product specifications - Sectional
specification for class B single-mode fibres


IEC 60794-1-1 - Optical fibre cables - EN 60794-1-1 -
Part 1-1: Generic specification - General


IEC 60794-1-2 - Optical fibre cables - EN 60794-1-2 -
Part 1-2: Generic specification - Basic optical
cable test procedures


IEC 60794-1-22 - Optical fibre cables - EN 60794-1-22 -
Part 1-22: Generic specification - Basic
optical cable test procedures -
Environmental test methods


IEC 60794-1-23 - Optical fibre cables - EN 60794-1-23 -
Part 1-23: Generic specification - Basic
optical cable test procedures - Cable
element test methods


IEC 60794-4 - Optical fibre cables - EN 60794-4 -
Part 4: Sectional specification - Aerial optical
cables along electrical power lines


IEC 61395 - Overhead electrical conductors - Creep test EN 61395 -
procedures for stranded conductors

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SIST EN 60794-4-20:2013

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SIST EN 60794-4-20:2013




IEC 60794-4-20

®


Edition 1.0 2012-10




INTERNATIONAL



STANDARD








colour

inside










Optical fibre cables –

Part 4-20: Aerial optical cables along electrical power lines – Family

specification for ADSS (All Dielectric Self Supported) optical cables


























INTERNATIONAL

ELECTROTECHNICAL

COMMISSION

PRICE CODE
V


ICS 33.180.10 ISBN 978-2-83220-434-4



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


® Registered trademark of the International Electrotechnical Commission

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SIST EN 60794-4-20:2013
– 2 – 60794-4-20 © IEC:2012(E)


CONTENTS

FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 7
4 Optical fibres . 9
4.1 General . 9
4.2 Attenuation . 9
4.2.1 Attenuation coefficient . 9
4.2.2 Attenuation discontinuities . 9
4.3 Cut-off wavelength of cabled fibre . 9
4.4 Fibre colouring . 9
4.5 Polarisation mode dispersion (PMD) . 9
5 Cable elements . 9
6 Optical fibre cable constructions . 10
6.1 General . 10
6.2 Optical unit . 10
6.3 Cable protection elements . 10
7 Main requirements for installation and operating conditions . 11
8 Cable design considerations . 11
9 Cable tests . 12
9.1 General . 12
9.2 Classification of tests . 12
9.2.1 Type tests . 12
9.2.2 Factory acceptance tests . 13
9.2.3 Routine tests . 13
9.3 Tensile performance . 13
9.3.1 General . 13
9.3.2 Maximum allowed tension (MAT) . 13
9.4 Installation capability . 13
9.4.1 General . 13
9.4.2 Sheave test . 13
9.4.3 Repeated bending . 14
9.4.4 Impact . 14
9.4.5 Crush . 15
9.4.6 Kink . 15
9.4.7 Torsion . 15
9.5 Vibration testing . 16
9.5.1 Aeolian vibration test . 16
9.5.2 Low frequency vibration test (galloping test) . 16
9.6 Temperature cycling . 17
9.7 Water penetration . 18
9.8 Weathering resistance . 18

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SIST EN 60794-4-20:2013
60794-4-20 © IEC:2012(E) – 3 –
9.9 Tracking and erosion resistance test . 18
9.10 Creep behaviour . 19
9.11 Fitting compatibility . 19
10 Factory acceptance tests . 19
11 Routine tests . 19
12 Quality assurance . 20
Annex A (informative) Packaging and marking . 21
Annex B (informative) Installation considerations for ADSS cables. 22
Annex C (informative) Electrical test (TRACKING) . 23
Annex D (informative) All Dielectric Self-Supported (ADSS) cables to be used in
overhead power lines (Blank detail specification) . 31
Bibliography . 33

Figure C.1 – Draft of test equipment . 25
Figure C.2 – Test chamber . 25
Figure C.3 – Electric scheme for the test . 27
Figure C.4 – Details of the sample . 27
Figure C.5 – Nozzle . 28
Figure C.6 – Details for the spraying . 29
Figure C.7 – Pollution model . 30
Figure C.8 – Basic circuit for arcing test. 30

Table 1 – Cable design characteristics . 11
Table 2 – Optional parameters (if required by customer) . 12
Table C.1 – R and C values for different pollution index values . 29
eq eq
Table D.1 – Blank detail specification . 31

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SIST EN 60794-4-20:2013
– 4 – 60794-4-20 © IEC:2012(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

OPTICAL FIBRE CABLES –

Part 4-20: 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.
The text of this standard is based on the following documents:
FDIS Report on voting
86A/1467/FDIS 86A/1482/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN 60794-4-20:2013
60794-4-20 © IEC:2012(E) – 5 –
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 publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this standard may be published at a later date.
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 60794-4-20:2013
– 6 – 60794-4-20 © IEC:2012(E)
OPTICAL FIBRE CABLES –

Part 4-20: Aerial optical cables along electrical power lines –
Family specification for ADSS (All Dielectric Self Supported)
optical cables



1 Scope
This part of IEC 60794, which is a family specification, covers optical telecommunication
cables, commonly with single-mode fibres to be used primarily in overhead power lines
applications. The cable may 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 standard.
NOTE In some particular situations in the electrical industry, short overhead links can be also designed with
multimode fibres.
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 types of installation, operating
and environmental conditions and loading, as described in Annex B.
This standard 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.
The standard provides both construction and performance requirements that ensure, within
the guidelines of this standard, that the mechanical capabilities of the cable components and
maintenance of optical fibre integrity and optical transmissions are proper.
This standard excludes any “lashed” or “wrapped” OPAC cables.
Cables intended for installation in conformity with ISO/IEC 24702 and related standards may
require the specification of additional tests to ensure their suitability in the applicable
environments defined by the mechanical, ingress, climatic and chemical, and electromagnetic
(MICE) classification. These tests are outside of the scope of IEC 60794 cable specifications,
and MICE criteria are not part of the requirements for IEC 60794 specifications. The MICE
tests may be the same as, similar to, or substantially different from, the tests required by
IEC 60794 specifications. Cables manufactured per IEC 60794 specifications may or may not
meet the MICE criteria. For supplemental discussion, see IEC/TR 62362.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures –
Attenuation

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SIST EN 60794-4-20:2013
60794-4-20 © IEC:2012(E) – 7 –
IEC 60793-1-44, Optical fibres – Part 1-44: Measurement methods and test procedures – Cut-
off wavelength
IEC 60793-1-48, Optical fibres – Part 1-48: Measurement methods and test procedures –
Polarization mode dispersion
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 60794-1-2, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test
1 2
procedures ,
IEC 60794-1-22, Optical fibre cables – Part 1-22: Generic specification – Basic optical cable
test procedures – Environmental test methods
IEC 60794-1-23, Optical fibre cables – Part 1-23: Generic specification – Basic optical cable
test procedures – Cable element test methods
IEC 60794-4, Optical fibre cables – Part 4: Sectional Specification – Aerial optical cables
along electrical power lines
IEC 61395, Overhead electrical conductors – Creep test procedures for stranded conductors
3 Terms, definitions and abbreviations
For the purposes of this document, the terms and definitions given in IEC 60794-1-1 and
IEC 60794-4, as well as the following, apply.
3.1
maximum allowable tension
MAT
maximum tensile load that may be applied to the cable without detriment to the performance
requirements (optical performance, fibre durability) due to fibre strain
Note 1 to entry: Due to installation codes the MAT value is sometimes restricted to be less than 60 % of the
breaking tension of the cable.
3.2
maximum operation tension
MOT
tensile load that can be applied to the cable either permanently or for a long term without
producing any strain to the fibres
Note 1 to entry: This condition should correspond to the tension with no ice and no gale wind at average mean
temperatures throughout the year, assumed to be between 16 ºC and 20 ºC.
3.3
zero strain margin
tensile load that the cable can sustain without strain on fibres due to cable elongation
___________
1
 This document has been withdrawn, but can still be purchased, if necessary. Until IEC 60794-1-21 will be
available, the tests stated in Clause 9 have to be taken from IEC 60794-1-2.
2
 This standard will be replaced by IEC 60794-1-21, Optical fibre cables – Part 1-21: Generic specification –
Basic optical cable test procedures – Mechanical test methods (see also Bibliography), as soon as it will be
available.

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SIST EN 60794-4-20:2013
– 8 – 60794-4-20 © IEC:2012(E)
3.4
breaking tension
tensile load that will produce physical rupture of the cable
Note 1 to entry: There is no optical consideration related to this parameter.
Note 2 to entry: The breaking tension should be calculated. The design model shall be validated; the cables do not
need to be tested.
3.5
maximum installation tension
MIT
maximum load that should be applied during the installation procedure
Note 1 to entry: The maximum installation tension refers mainly to the final adjust of sag (also called sagging
load), and the same tension limit can be used for the deployment of the cable (also called stringing load).
Note 2 to entry: This is a recommended value aimed at avoiding tension values higher than MAT during
operational life due to wind, ice or temperature changes.
3.6
ADSS
all dielectric self supported cable
dielectric cable that is capable of enduring aerial installation and providing long term service,
without any external tensile support
3.7
OPAC
optical attached cable
dielectric, not self-supported, optical attached cable
Note 1 to entry: OPACs can be used with one of the following attachment methods:
• wrapped, known as an all-dielectric (wrap): using special machinery, a lightweight flexible non-metallic cable is
wrapped helically around either the earth wire or the phase conductor;
• lashed: non-metallic cables are installed longitudinally alongside the earth wire, the phase conductor or on a
separate support cable (on a pole route) and are held in position with a binder or adhesive cord;
• spiral attached: similar to the lashed cables except that the method of attachment involves the use of special
preformed spiral attachment clips.
Note 2 to entry: OPAC cable designs are not covered by this specification.
3.8
cable fittings and dampers

3.8.1
suspension cable fitting
device to hold up the cable in intermediate support points along an aerial line, where the
cable is under tension at both sides of the fitting
3.8.2
dead end cable fitting
device designed to terminate an installation run, isolate a splice location or maintenance coil,
provide slack span locations, or provide for extreme angle turns, where the cable is under
tensional load on one side of the fitting and tension free on the other
3.8.2
damper
device attached to a cable in order to suppress or minimize vibrations due to wind

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SIST EN 60794-4-20:2013
60794-4-20 © IEC:2012(E) – 9 –
4 Optical fibres
4.1 General
Single mode optical fibres shall be used which meet the requirements of IEC 60793-2-50. In
this clause only the main characteristics are mentioned.
Fibres other than those spe
...