Optical fibre cables - Part 3: Outdoor cables - Sectional specification

IEC 60794-3:2022 is available as IEC 60794-3:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60794-3: 2022 specifies the requirements for optical fibre cables and cable elements which are intended to be used externally in communications networks. Other types of applications requiring similar types of cables can be considered. Requirements for cables to be used in ducts, for directly buried applications, aerial cables and cables for lake and river crossings are included in this document. Also included are cables for specialized use in sewers and in water and gas pipes. For aerial application, this document does not cover all functional aspects of cables installed in the vicinity of overhead power lines. For such applications, additional requirements and test methods can be necessary. Moreover, this document excludes optical ground wires and cables attached to the phase or earth conductors of overhead power lines. For cables for lake and river crossings, this document does not cover methods of cable repair, nor repair capability, nor does it cover cables for use with underwater line amplifiers. This fifth edition cancels and replaces the fourth edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical change with respect to the previous edition: the ribbon specification has been removed, because it is covered in IEC 60794-1-31.

Câbles à fibres optiques - Partie 3: Câbles extérieurs - Spécification intermédiaire

IEC 60794-3:2022 est disponible sous forme de IEC 60794-3:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60794-3: 2022 spécifie les exigences relatives aux câbles et aux éléments de câble à fibres optiques destinés à être utilisés à l'extérieur dans des réseaux de télécommunication. D'autres types d'applications qui nécessitent des câbles d'une catégorie similaire peuvent être pris en considération. Le présent document comporte des exigences qui concernent les câbles destinés à être installés dans des conduites, les câbles directement enterrés, les câbles aériens et les câbles pour traversées de lacs et de rivières. Il comporte également des câbles destinés à des utilisations spécialisées, dans les égouts et dans les conduites d'eau et de gaz. Pour ce qui est des applications aériennes, le présent document ne couvre pas tous les aspects fonctionnels des câbles installés à proximité de lignes aériennes de transport d'énergie. De telles applications peuvent nécessiter l'adjonction d'exigences et de méthodes d'essai. En outre, le présent document exclut les câbles de garde avec fibres optiques et les câbles liés aux conducteurs de phase ou de terre des lignes aériennes de transport d'énergie. Pour les câbles pour traversées de lacs et de rivières, le présent document ne couvre pas les méthodes de réparation du câble ni de capacité de réparation, et ne couvre pas les câbles utilisés dans les amplificateurs de lignes pour traversées de lacs et de rivières. Cette cinquième édition annule et remplace la quatrième édition parue en 2014. Cette édition constitue une révision technique. Cette édition contient la modification technique majeure suivante par rapport à l'édition précédente: la spécification relative aux rubans a été supprimée car elle est couverte par l'IEC 60794-1-31.

General Information

Status
Published
Publication Date
16-Feb-2022
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
17-Feb-2022
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IEC 60794-3
Edition 5.0 2022-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 3: Outdoor cables – Sectional specification
Câbles à fibres optiques –
Partie 3: Câbles extérieurs – Spécification intermédiaire
IEC 60794-3:2022-02(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60794-3
Edition 5.0 2022-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 3: Outdoor cables – Sectional specification
Câbles à fibres optiques –
Partie 3: Câbles extérieurs – Spécification intermédiaire
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-1077-4

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
---------------------- Page: 3 ----------------------
– 2 – IEC 60794-3:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions, symbols and abbreviated terms .......................................................... 7

4 Optical fibre ..................................................................................................................... 7

4.1 General ................................................................................................................... 7

4.2 Attenuation ............................................................................................................. 7

4.2.1 Attenuation coefficient ..................................................................................... 7

4.2.2 Attenuation uniformity – Attenuation discontinuities ......................................... 8

4.3 Cut-off wavelength .................................................................................................. 8

4.4 Fibre colouring ........................................................................................................ 8

4.5 Polarization mode dispersion (PMD) ....................................................................... 8

5 Cable element ................................................................................................................. 8

5.1 General ................................................................................................................... 8

5.2 Tight secondary coating or buffer ............................................................................ 9

5.3 Ruggedized fibre ..................................................................................................... 9

5.4 Slotted core ............................................................................................................ 9

5.5 Polymeric tube ........................................................................................................ 9

5.6 Ribbon .................................................................................................................... 9

5.7 Metallic tube ......................................................................................................... 10

5.7.1 Metallic tube on the optical core .................................................................... 10

5.7.2 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 ................................................................................ 10

6.3 Cable core filling ................................................................................................... 11

6.4 Strength member .................................................................................................. 11

6.5 Moisture barrier .................................................................................................... 11

6.6 Cable sheath and armouring ................................................................................. 12

6.6.1 Inner sheath .................................................................................................. 12

6.6.2 Armouring ...................................................................................................... 12

6.6.3 Outer sheath .................................................................................................. 12

6.7 Sheath marking ..................................................................................................... 13

7 Installation and operating conditions .............................................................................. 13

8 Characterization of cable elements ................................................................................ 13

9 Optical fibre cable tests ................................................................................................. 14

10 Quality assurance .......................................................................................................... 15

Bibliography .......................................................................................................................... 16

Table 1 – Characteristics of different types of cable elements ............................................... 14

Table 2 – Mechanical and environmental applicable tests ..................................................... 15

---------------------- Page: 4 ----------------------
IEC 60794-3:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 3: Outdoor cables – Sectional specification
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

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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.

IEC 60794-3 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical

committee 86: Fibre optics. It is an International Standard.

This fifth edition cancels and replaces the fourth edition published in 2014. This edition

constitutes a technical revision.

This edition includes the following significant technical change with respect to the previous

edition: the ribbon specification has been removed, because it is covered in IEC 60794-1-31.

The text of this International Standard is based on the following documents:
Draft Report on voting
86A/2155/FDIS 86A/2184/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
---------------------- Page: 5 ----------------------
– 4 – IEC 60794-3:2022 © IEC 2022

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.
The language used for the development of this International Standard is English.

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 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.
---------------------- Page: 6 ----------------------
IEC 60794-3:2022 © IEC 2022 – 5 –
INTRODUCTION

IEC 60794-1-21, IEC 60794-1-22, IEC 60794-1-23, and IEC 60794-1-24 have been (or will be)

divided into multiple standards which defines one test method each. IEC 60794-1-2:2021 gives

cross references between old standards and new standards.
---------------------- Page: 7 ----------------------
– 6 – IEC 60794-3:2022 © IEC 2022
OPTICAL FIBRE CABLES –
Part 3: Outdoor cables – Sectional specification
1 Scope

This part of IEC 60794 specifies the requirements for optical fibre cables and cable elements

which are intended to be used externally in communications networks. Other types of

applications requiring similar types of cables can be considered.

Requirements for cables to be used in ducts, for directly buried applications, aerial cables and

cables for lake and river crossings are included in this document. Also included are cables for

specialized use in sewers and in water and gas pipes.

For aerial application, this document does not cover all functional aspects of cables installed in

the vicinity of overhead power lines. For such applications, additional requirements and test

methods can be necessary. Moreover, this document excludes optical ground wires and cables

attached to the phase or earth conductors of overhead power lines.

For cables for lake and river crossings, this document does not cover methods of cable repair,

nor repair capability, nor does it cover cables for use with underwater line amplifiers.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.
IEC 60304, Standard colours for insulation for low-frequency cables and wires

IEC 60708, Low-frequency cables with polyolefin insulation and moisture barrier polyolefin

sheath

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: Attenuation measurement methods

IEC 60793-1-44, Optical fibres – Part 1-44: Measurement methods and test procedures –

Cut-off wavelength
IEC 60793-2, Optical fibres – Part 2: Product specifications – General
IEC 60794-1-1, Optical fibre cables – Part 1-1: Generic specification – General

IEC 60794-1-21:2015, Optical fibre cables – Part 1-21: Generic specification – Basic optical

cable test procedures – Mechanical test methods
---------------------- Page: 8 ----------------------
IEC 60794-3:2022 © IEC 2022 – 7 –

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 elements test methods

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
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

Optical fibres shall be used which meet the requirements of IEC 60793-2. The fibre type shall

be agreed between the customer and supplier.
4.2 Attenuation
4.2.1 Attenuation coefficient

The maximum cabled fibre attenuation coefficient shall conform to IEC 60794-1-1. Particular

values may be agreed between the customer and supplier.
---------------------- Page: 9 ----------------------
– 8 – IEC 60794-3:2022 © IEC 2022
The attenuation coefficient shall be measured in accordance with IEC 60793-1-40.
4.2.2 Attenuation uniformity – Attenuation discontinuities
Attenuation uniformity shall conform to IEC 60794-1-1.
4.3 Cut-off wavelength

For single-mode fibre, the cabled fibre cut-off wavelength λ shall be less than the operational

wavelength, when measured in accordance with IEC 60793-1-44, and in conformity with

IEC 60794-1-1.
4.4 Fibre colouring

If the primary coated fibres are coloured for identification, the coloured coating shall be readily

identifiable throughout the lifetime of the cable and shall be a reasonable match to IEC 60304.

4.5 Polarization mode dispersion (PMD)
Cabled single-mode fibre PMD shall conform to IEC 60794-1-1.
5 Cable element
5.1 General

Generally, optical cables comprise several elements or individual constituents, depending on

the cable design which takes into account the cable application, operating environment and

manufacturing processes, as well as the need to protect the fibre during handling and cabling.

The material(s) used for a cable element shall be selected to be compatible with the other

elements in contact with it. An appropriate compatibility test method shall be defined in the

family or detail specification.

When the fibres are in contact with a filling compound, the compatibility of the filling compound

with the fibre coating shall be demonstrated by testing coating stripping force stability after

accelerated ageing in accordance with IEC 60794-1-23, method G10A, G10B, or G10C method

A, B, and C). Aging condition should be in accordance with IEC 60794-1-22, method F9 , but

alternative ageing conditions and tests may be agreed between the customer and supplier.

Optical elements are cable elements containing optical fibres and are designed to be a primary

functional unit of the cable core. They may comprise any of the cable elements described in 5.2

to 5.7. Optical elements and each fibre within a cable element shall be uniquely identified, for

example by colours, a positional configuration, markings, tapes, threads or as specified in the

detail specification.

Tests may be performed on cable elements either in uncabled form or in a finished cable. Unless

otherwise specified, testing shall be performed on cable elements in a finished cable. This

means that testing shall be performed only on a finished cable if the cable element

manufacturing operation is done by the same manufacturer as the cabling operation. Testing

shall be performed on cable elements only if the cable element is supplied by a third party; this

does not exclude testing of the finished cable.

Different types of optical elements are described in 5.2 to 5.7 and in IEC 60794-1-3.

___________
These are intented to be replaced. See Introduction.
This is intented to be replaced. See Introduction.
---------------------- Page: 10 ----------------------
IEC 60794-3:2022 © IEC 2022 – 9 –
5.2 Tight secondary coating or buffer

If a tight secondary coating is required, it shall consist of one or more layers of polymeric

material. The coating shall be easily removable for splicing. For tight buffers, the buffer and

fibre primary coating shall be removable in one operation over a length of 10 mm to 25 mm,

depending on customer requirements. The nominal overall diameter of the secondary coating

shall be between 800 µm and 900 µm. The value, which shall be agreed between the customer

and supplier, shall have a tolerance of ±50 µm. The fibre/secondary coating eccentricity shall

not exceed 75 µm, unless otherwise agreed between the customer and supplier.

The colour of the tight secondary coating shall be readily identifiable throughout the life-time of

the cable and shall be a reasonable match to IEC 60304.
5.3 Ruggedized fibre

Further protection can be provided to tight secondary coated fibres by surrounding one or more

with non-metallic strength members within a sheath of suitable material (e.g. for fan-out cables).

5.4 Slotted core

The slotted core is obtained by extruding a suitable material (for example polyethylene or

polypropylene) with a defined number of slots, providing helical or SZ configuration along the

core. One or more primary coated fibres or optical element is located in each slot which may

be filled by compound.

The slotted core usually contains a central element which may be either metallic or non-metallic.

In this case, there shall be adequate adhesion between the central element and the extruded

core in order to obtain the required temperature stability and tensile behaviour for the slotted

core element.

The profile of the slot shall be uniform and shall ensure the optical and mechanical performance

required of the optical cable.
5.5 Polymeric tube

One or more primary coated fibres or other optical elements are packaged (loosely or not) in a

tube construction which may be filled by compound. The tube may be reinforced with a

composite wall. The polymeric tube may be hard, to provide some crush protection to the fibre

bundle, or soft to enable easy strippability of the tube without specialized tools.

If required, the suitability of the tube shall be determined by an evaluation of its kink resistance

in accordance with IEC 60794-1-23, method G7 .

If used, the filling compound in the tube shall comply with IEC 60794-1-21:2015, method E15.

The filled tube shall comply with IEC 60794-1-22, method F16 , when tested in tube or cabled

form.
5.6 Ribbon
Optical fibre ribbons are optical fibres assembled in a composite linear array.

Ribbon structure, dimensions, mechanical requirements, and identification are specified in

IEC 60794-1-31.
___________
This is intented to be replaced. See Introduction.
This is intented to be replaced. See Introduction.
---------------------- Page: 11 ----------------------
– 10 – IEC 60794-3:2022 © IEC 2022
5.7 Metallic tube
5.7.1 Metallic tube on the optical core

A metallic tube (for example, aluminium tube) may be applied over the optical core (for example,

aluminium spacer or stranded tube).
5.7.2 Fibres directly located in a metallic tube

One or more primary coated and coloured fibres are packaged in a metallic hermetically sealed

tube, which shall be filled, if necessary, with a suitable compound to avoid water penetration.

The inside surface of the tube should be smooth without any defects.
6 Optical fibre cable construction
6.1 General

The intention is that the cable should be designed and manufactured for a predicted operating

lifetime of at least 20 years. In this context, the attenuation of the installed cable at the

operational wavelength(s) shall not exceed values agreed between the customer and supplier.

The tests of this document are intended to assess the performance of cables, as manufactured

and under agreed ageing and performance-limit tests. These tests are not intended to define

end-of-life performance, but may be used as agreed between customer and supplier to predict

such performance. The materials in the cable shall not present a health hazard within its

intended use.

The fibres in the cables are usually of the same type, but some cables may contain multiple

specified fibre types and fibres of the same type may have different origins.

There shall be no fibre splice in a delivery length, unless otherwise agreed by the customer and

supplier.

It shall be possible to identify each individual fibre throughout the length of the cable.

For the particular case of cables for aerial application, to avoid excess fibre strain induced by

the environmental conditions, such as wind loading or ice loading, the cable construction, and

particularly the strength members, shall be selected to limit this strain to the value agreed

between the customer and supplier.
6.2 Lay-up of the cable elements
Optical elements as described in Clause 5 may be laid up as follows:
a) optical element(s) without a stranding lay;

b) a number of homogeneous optical elements using helical or SZ configurations (ribbon

elements may be laid up by stacking two or more elements);

c) a number of different configurations in slotted core such as tight coated, ribbon or tube;

d) a number of different configurations in a tube such as tight coated or ribbon;

e) if required, insul
...

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