SIST EN IEC 60794-4:2018

Optical fibre cables - Part 4: Sectional specification - Aerial optical cables along electrical power lines (IEC 60794-4:2018)

Specifies the electrical, mechanical and optical requirements and test methods for aerial optical cables including OPGW (optical ground wire), OPPC (optical phase conductor), MASS (metalic aerial self-supported cable), ADSS (all-dielectric self-supporting cable) and OPAC (optical attached cable).

Lichtwellenleiterkabel - Teil 4: Rahmenspezifikation - Lichtwellenleiter-Luftkabel auf Starkstrom-Freileitungen (IEC 60794-4:2018)

Câbles à fibres optiques - Partie 4: Spécification intermédiaire - Câbles optiques aériens le long des lignes électriques de puissance (IEC 60794-4:2018)

Spécifie les prescriptions électriques, mécaniques et optiques ainsi que les méthodes d'essai pour les câbles optiques aériens comprenant les câbles de garde à fibres optiques (OPGW), les conducteurs de phase à fibres optiques (OPPC), les câbles autoporteurs métalliques à fibres optiques (MASS), les câbles autoporteurs diélectriques à fibres optiques (ADSS) et les câbles optiques attachés (OPAC).

Optični kabli - 4. del: Področna specifikacija - Nadzemni optični kabli vzdolž elektroenergetskih vodov (IEC 60794-4:2018)

Določa električne, mehanske in optične zahteve ter preskusne metode za optične kable, vključno z naslednjimi: optična ozemljitvena žica (OPGW), optični linijski vodnik (OPPC), nadzemni kovinski samonosilni kabel (MASS), dielektrični samonosilni optični kabel (ADSS) in optični nameščeni kabel (OPAC).

General Information

• Status: Published
• Publication Date: 10-Sep-2018
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-Aug-2018
• Due Date: 03-Nov-2018
• Completion Date: 11-Sep-2018
• Ref Project: EN IEC 60794-4:2018 - Optical fibre cables - Part 4: Sectional specification - Aerial optical cables along electrical power lines

Relations

• Revised: SIST EN 60794-4:2004 - Optical fibre cables - Part 4: Sectional specification - Aerial optical cables along electrical power lines (IEC 60794-4:2003)
• Effective Date: 03-Nov-2015
• Replaces: SIST EN 60794-4:2004 - Optical fibre cables - Part 4: Sectional specification - Aerial optical cables along electrical power lines (IEC 60794-4:2003)
• Effective Date: 28-Aug-2018
• Replaces: SIST EN 60794-4:2004 - Optical fibre cables - Part 4: Sectional specification - Aerial optical cables along electrical power lines (IEC 60794-4:2003)
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60794-4:2018
01-november-2018
1DGRPHãþD
SIST EN 60794-4:2004
2SWLþQLNDEOLGHO3RGURþQDVSHFLILNDFLMD1DG]HPQLRSWLþQLNDEOLY]GROå
HOHNWURHQHUJHWVNLKYRGRY,(&
Optical fibre cables - Part 4: Sectional specification - Aerial optical cables along electrical
power lines (IEC 60794-4:2018)
Lichtwellenleiterkabel - Teil 4: Rahmenspezifikation - Lichtwellenleiter-Luftkabel auf
Starkstrom-Freileitungen (IEC 60794-4:2018)
Câbles à fibres optiques - Partie 4: Spécification intermédiaire - Câbles optiques aériens
le long des lignes électriques de puissance (IEC 60794-4:2018)
Ta slovenski standard je istoveten z: EN IEC 60794-4:2018
ICS:
33.180.10 2SWLþQDYODNQDLQNDEOL Fibres and cables
SIST EN IEC 60794-4:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60794-4:2018

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SIST EN IEC 60794-4:2018


EUROPEAN STANDARD EN IEC 60794-4

NORME EUROPÉENNE

EUROPÄISCHE NORM
August 2018
ICS 33.180.10 Supersedes EN 60794-4:2003
English Version
Optical fibre cables - Part 4: Sectional specification - Aerial
optical cables along electrical power lines
(IEC 60794-4:2018)
Câbles à fibres optiques - Partie 4: Spécification Lichtwellenleiterkabel - Teil 4: Rahmenspezifikation -
intermédiaire - Câbles optiques aériens le long des lignes Lichtwellenleiter-Luftkabel auf Starkstrom-Freileitungen
électriques de transport d'énergie (IEC 60794-4:2018)
(IEC 60794-4:2018)
This European Standard was approved by CENELEC on 2018-07-30. 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 60794-4:2018 E

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SIST EN IEC 60794-4:2018
EN IEC 60794-4:2018 (E)
European foreword
The text of document 86A/1862/FDIS, future edition 2 of IEC 60794-4, 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 60794-4:2018.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-04-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-07-30
document have to be withdrawn

This document supersedes EN 60794-4:2003
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 60794-4:2018 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 60794-1-2 NOTE Harmonized as EN 60794-1-2
IEC 60794-1-23 NOTE Harmonized as EN 60794-1-23
IEC 60794-1-31 NOTE Harmonized as EN IEC 60794-1-31

2

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SIST EN IEC 60794-4:2018
EN IEC 60794-4:2018 (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 60104 -  Aluminium-magnesium-silicon alloy wire for - -
overhead line conductors
IEC 60304 -  Standard colours for insulation for low- HD 402 S2 -
frequency cables and wires
IEC 60793-1-21 -  Optical fibres -- Part 1-21: Measurement EN 60793-1-21 -
methods and test procedures - Coating
geometry
IEC 60793-1-32 -  Optical fibres -- Part 1-32: Measurement EN 60793-1-32 -
methods and test procedures - Coating
strippability
IEC 60793-1-40 -  Optical fibres -- Part 1-40: Measurement EN 60793-1-40 -
methods and test procedures - Attenuation
IEC 60793-1-44 -  Optical fibres -- Part 1-44: Measurement EN 60793-1-44 -
methods and test procedures - Cut-off
wavelength
Optical fibres – Part 1-48: Measurement
IEC 60793-1-48 -  EN 60793-1-48 -
methods and test procedures -Polarization
mode dispersion
IEC 60793-2 -  Optical fibres - Part 2: Product specifications EN 60793-2 -
- General
IEC 60794-1-1 -  Optical fibre cables - Part 1-1: Generic EN 60794-1-1 -
specification - General
IEC 60794-1-21 -  Optical fibre cables - Part 1-21: Generic EN 60794-1-21 -
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
3

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SIST EN IEC 60794-4:2018
EN IEC 60794-4:2018 (E)
IEC 60794-1-23 -  Optical fibre cables -- Part 1-23: Generic EN 60794-1-23 -
specification - Basic optical cable test
procedures - Cable element test methods
IEC 60794-1-24 -  Optical fibre cables -- Part 1-24: Generic EN 60794-1-24 -
specification - Basic optical cable test
procedures - Electrical test methods
IEC 60794-3 -  Optical fibre cables - Part 3: Outdoor cables - EN 60794-3 -
Sectional specification
IEC 60794-4-20 2012 Optical fibre cables -- Part 4-20: Aerial optical EN 60794-4-20 2012
cables along electrical power lines - Family
specification for ADSS (All Dielectric Self
Supported) Optical cables
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 60811-401 -  Electric and optical fibre cables - Test EN 60811-401 -
methods for non-metallic materials -- Part
401: Miscellaneous tests - Thermal ageing
methods - Ageing in an air oven
IEC 60811-406 -  Electric and optical fibre cables - Test EN 60811-406 -
methods for non-metallic materials -- Part
406: Miscellaneous tests - Resistance to
stress cracking of polyethylene and
polypropylene compounds
IEC 60811-501 -  Electric and optical fibre cables - Test EN 60811-501 -
methods for non-metallic materials - Part 501:
Mechanical tests - Tests for determining the
mechanical properties of insulating and
sheathing compounds
IEC 60811-604 2012 Electric and optical fibre cables - Test EN 60811-604 2012
methods for non-metallic materials -- Part
604: Physical tests - Measurement of
absence of corrosive components in filling
compounds
IEC 60811-607 -  Electric and optical fibre cables - Test EN 60811-607 -
methods for non-metallic materials -- Part
607: Physical tests - Test for the assessment
of carbon black dispersion in polyethylene
and polypropylene
IEC 60888 -  Zinc-coated steel wires for stranded - -
conductors
IEC 60889 -  Hard-drawn aluminium wire for overhead line EN 60889 -
conductors
IEC 61089 1991 Round wire concentric lay overhead electrical - -
stranded conductors
IEC 61232 -  Aluminium-clad steel wires for electrical EN 61232 -
purposes
4

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SIST EN IEC 60794-4:2018
EN IEC 60794-4:2018 (E)
IEC 61394 -  Overhead lines - Requirements for greases - -
for aluminium, aluminium alloy and steel bare
conductors
IEC 61395 -  Overhead electrical conductors - Creep test EN 61395 -
procedures for stranded conductors

5

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SIST EN IEC 60794-4:2018

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SIST EN IEC 60794-4:2018



IEC 60794-4

®


Edition 2.0 2018-06




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Optical fibre cables –

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




Câbles à fibres optiques –

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

électriques de transport d’énergie















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.180.10 ISBN 978-2-8322-5782-1




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 60794-4:2018
– 2 – IEC 60794-4:2018 © IEC 2018
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviated terms . 8
4 Optical fibre . 8
4.1 General . 8
4.2 Attenuation . 8
4.2.1 Attenuation coefficient . 8
4.2.2 Attenuation uniformity-attenuation discontinuities . 8
4.3 Cut-off wavelength of cabled fibre . 8
4.4 Fibre colouring . 8
4.5 Polarization mode dispersion (PMD) . 8
5 Cable element . 8
5.1 General . 8
5.2 Slotted core . 9
5.3 Polymeric tube . 9
5.4 Ribbon . 10
5.5 Metallic tube . 10
5.5.1 General . 10
5.5.2 Metallic tube on the optical core . 10
5.5.3 Fibres directly located in a metallic tube . 10
6 Optical fibre cable construction . 10
6.1 General . 10
6.2 Lay-up of the cable elements . 11
6.3 Cable core filling . 11
6.4 Strength members . 11
6.4.1 General . 11
6.4.2 OPGW, OPPC and MASS . 11
6.4.3 ADSS and OPAC . 12
6.5 Cable sheath (ADSS and OPAC) . 12
6.5.1 Inner sheath . 12
6.5.2 Outer sheath . 12
6.6 Sheath marking . 13
7 Characterization of cable elements . 13
8 Design characteristics . 14
9 Optical fibre cable tests . 14
9.1 General . 14
9.2 Tensile performance . 16
9.3 Stress-strain test on metallic cables . 16
9.4 Sheave test . 16
9.5 Short-circuit . 16
9.6 Lightning test . 16
9.7 Ageing . 16
9.8 Fibre coating compatibility . 17
9.9 Hydrogen gas . 17

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SIST EN IEC 60794-4:2018
IEC 60794-4:2018 © IEC 2018 – 3 –
9.10 Aeolian vibration . 17
9.11 Creep. 17
9.12 Fitting compatibility . 17
9.13 Grease . 17
9.14 Attenuation . 17
9.15 Tracking and erosion resistance test on ADSS and OPAC . 17
9.16 UV resistance test on ADSS and OPAC . 17
9.17 Shotgun resistance test on ADSS and OPAC . 18
9.18 Conductor access trolley for OPAC . 18
10 Quality assurance . 18
11 Packaging . 18
Annex A (normative) Recommended methods of calculating rated tensile strength,
cross-section of a layer of trapezoidal shaped wires, modulus of elasticity, linear
expansion and DC resistance for OPGW, OPPC and MASS . 19
A.1 Calculation of rated tensile strength (RTS) . 19
A.2 Calculation of the cross-sectional area of a layer of trapezoidal or Z- shaped
wires . 19
A.3 Calculation of the final modulus of elasticity (E) . 19
A.4 Calculation of coefficient of linear expansion (β) . 20
A.5 Calculation of DC resistance . 20
Bibliography . 21

Table 1 – Characteristics of different types of cable elements . 13
Table 2 – Design characteristics . 14
Table 3 – Mechanical and environmental applicable tests . 15

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

OPTICAL FIBRE CABLES –

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

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 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee TC 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2003. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the specification has been streamlined by cross-referencing IEC 60794-1-1;
b) the classification as type tests or routine tests has been deleted;
c) cable kink test has been deleted;
d) creep test for ADSS is referred to IEC 60794-4-20.

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SIST EN IEC 60794-4:2018
IEC 60794-4:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1862/FDIS 86A/1868/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 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.

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SIST EN IEC 60794-4:2018
– 6 – IEC 60794-4:2018 © IEC 2018
OPTICAL FIBRE CABLES –

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



1 Scope
This part of IEC 60794 covers cable construction, test methods, optical, mechanical,
environmental and electrical performance requirements for aerial optical fibre cables and
cable elements which are intended to be used along power lines (OCEPL) as a high
bandwidth transport media for communications and control optical signals, including optical
ground wires (OPGW), optical phase conductors (OPPC), metallic aerial self-supported cables
(MASS), all-dielectric self-supporting cables (ADSS) and optical attached cables (OPAC).
This document excludes figure-8 optical cables to be used on telephone utility poles.
The IEC TR 62839-1 gives recommendations to provide the customer with the environmental
declaration on request.
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 60104, Aluminium-magnesium-silicon alloy wire for overhead line conductors
IEC 60304, Standard colours for insulation for low-frequency cables and wires
IEC 60793-1-21, Optical fibres – Part 1-21: Measurement methods and test procedures –
Coating geometry
IEC 60793-1-32, Optical fibres – Part 1-32: Measurement methods and test procedures –
Coating strippability
IEC 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures –
Attenuation
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, Optical fibres – Part 2: Product specifications – General
IEC 60794-1-1, Optical fibre cables – Part 1-1: Generic specification – General
IEC 60794-1-21, Optical fibre cables – Part 1-21: Generic specification – Basic optical cable
test procedures – Mechanical tests methods

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SIST EN IEC 60794-4:2018
IEC 60794-4:2018 © IEC 2018 – 7 –
IEC 60794-1-22, Optical fibre cables – Part 1-22: Generic specification – Basic optical cable
test procedures – Environmental tests methods
IEC 60794-1-23, Optical fibre cables – Part 1-23: Generic specification – Basic optical cable
test procedures – Cable element test methods
IEC 60794-1-24, Optical fibre cables – Part 1-24: Generic specification – Basic optical cable
test procedures – Electrical test methods
IEC 60794-3, Optical fibre cables – Part 3: Outdoor cables – Sectional specification
IEC 60794-4-20:2012, Optical fibre cables – Part 4-20: Aerial optical cables along power lines
– Family specification for ADSS (All Dielectric Self Supported) optical cables
IEC 60811-202, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 202: General tests – Measurement of thickness of non-metallic sheath
IEC 60811-203, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 203: General tests – Measurement of overall dimensions
IEC 60811-401, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 401: Miscellaneous tests – Thermal ageing methods – Ageing in an air oven
IEC 60811-406, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 406: Miscellaneous tests – Resistance to stress cracking of polyethylene and
polypropylene compounds
IEC 60811-501, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 501: Mechanical tests – Tests for determining the mechanical properties of insulating and
sheathing compounds
IEC 60811-604:2012, Electric and optical fibre cables – Test methods for non-metallic
materials – Part 604: Physical tests – Measurement of absence of corrosive components in
filling compounds
IEC 60811-607, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 607: Physical tests – Test for the assessment of carbon black dispersion in polyethylene
and polypropylene
IEC 60888, Zinc-coated steel wires for stranded conductors
IEC 60889, Hard-drawn aluminium wire for overhead line conductors
IEC 61089:1991, Round wire concentric lay overhead electrical stranded conductors
IEC 61232, Aluminium-clad steel wires for electrical purposes
IEC 61394, Overhead lines – Requirements for greases for aluminium, aluminium alloy and
steel bare conductors
IEC 61395, Overhead electrical conductors – Creep test procedures for stranded conductors

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SIST EN IEC 60794-4:2018
– 8 – IEC 60794-4:2018 © IEC 2018
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the terms, definitions, symbols and abbreviated terms
given in IEC 60794-1-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Optical fibre
4.1 General
Single-mode optical fibre which meets the requirements o
...