Optical fibre cables - Part 4-30: Aerial optical cables along electrical power lines - Family specification for optical phase conductor (OPPC) optical cables

IEC 60794-4-30:2021 specifies the optical fibre, cable elements, cable construction requirements, main requirements for installation and operating conditions, cable design characteristics and test for OPPC (optical phase conductor), used for carrying current as well as communication and data transmission. The corresponding environmental declaration can be built according to IEC TR 62839-1. The OPPC is a substitute for a conventional phase bare conductor containing optical fibres. Usually, the fibres are embedded loosely in protective buffer tubes. To fulfil mechanical and electrical requirements, an armouring of one or more layers with aluminium, aluminium alloy, and aluminium clad steel, galvanized steel or a mixture of them is helically stranded.

Câbles à fibres optiques - Partie 4-30: Câbles optiques aériens le long des lignes électriques de puissance - Spécification de famille pour les conducteurs de phase à fibres optiques (OPPC)

IEC 60794-4-30:2021 spécifie les fibres optiques, les éléments de câble, les exigences de construction des câbles, les principales exigences sur les conditions d'installation et de fonctionnement, les caractéristiques de conception des câbles et les essais sur les conducteurs de phase à fibres optiques (OPPC - optical phase conductor), utilisés pour transporter du courant, mais aussi pour les communications et la transmission de données. La déclaration environnementale correspondante peut être établie conformément à l'IEC TR 62839-1. Un conducteur de phase à fibres optiques (OPPC) peut remplacer un conducteur nu de phase conventionnel contenant des fibres optiques. Habituellement, les fibres sont enfermées librement dans des tubes de protection. Pour satisfaire aux exigences mécaniques et électriques, une armure constituée d'une ou plusieurs couches d'aluminium, d'un alliage d'aluminium, d'acier plaqué aluminium, d'acier galvanisé ou d'un mélange de ceux-ci est toronnée de manière hélicoïdale.

General Information

Status
Published
Publication Date
06-Apr-2021
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
07-Apr-2021
Ref Project

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IEC 60794-4-30
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 4-30: Aerial optical cables along electrical power lines – Family
specification for optical phase conductor (OPPC) optical cables
Câbles à fibres optiques –
Partie 4-30: Câbles optiques aériens le long des lignes électriques de
puissance – Spécification de famille pour les conducteurs de phase à fibres
optiques (OPPC)
IEC 60794-4-30:2021-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60794-4-30
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 4-30: Aerial optical cables along electrical power lines – Family
specification for optical phase conductor (OPPC) optical cables
Câbles à fibres optiques –
Partie 4-30: Câbles optiques aériens le long des lignes électriques de
puissance – Spécification de famille pour les conducteurs de phase à fibres
optiques (OPPC)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-9594-6

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 60794-4-30:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 4

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

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

3 Terms and definitions ...................................................................................................... 7

4 Symbols and abbreviated terms ....................................................................................... 8

5 Optical fibre ..................................................................................................................... 8

6 Cable elements ............................................................................................................... 8

7 Cable construction ........................................................................................................... 8

7.1 General ................................................................................................................... 8

7.2 Anti-corrosion ......................................................................................................... 9

8 Main installation requirements ......................................................................................... 9

8.1 General ................................................................................................................... 9

8.2 Installation methods and conditions of OPPC .......................................................... 9

8.3 Installation methods and conditions of the fittings ................................................. 10

8.4 Anti-twist ............................................................................................................... 10

8.5 Installation methods and conditions of the closure ................................................ 10

9 Cable design characteristics .......................................................................................... 10

10 Cable tests .................................................................................................................... 11

10.1 General ................................................................................................................. 11

10.2 Classification of tests ............................................................................................ 12

10.2.1 Type test ....................................................................................................... 12

10.2.2 Factory acceptance tests ............................................................................... 12

10.2.3 Routine tests ................................................................................................. 12

10.3 Tensile performance ............................................................................................. 12

10.4 Aeolian vibration ................................................................................................... 13

10.5 Creep.................................................................................................................... 13

10.6 Sheave test ........................................................................................................... 13

10.7 Stress-strain test ................................................................................................... 14

10.8 Breaking strength .................................................................................................. 14

10.9 Twist ..................................................................................................................... 14

10.9.1 General ......................................................................................................... 14

10.9.2 Set up ............................................................................................................ 14

10.9.3 Procedure ...................................................................................................... 15

10.10 Temperature cycling ............................................................................................. 15

10.11 Water penetration (applicable to optical unit only) ................................................. 15

10.12 Compound flow (drip) (applicable to optical unit only) ........................................... 15

10.13 Fibre coating compatibility .................................................................................... 15

10.14 Salt spray corrosion test ....................................................................................... 16

10.15 DC resistance test ................................................................................................ 16

10.16 Short-circuit .......................................................................................................... 16

10.17 Lightning test ........................................................................................................ 17

10.18 Current-temperature test ....................................................................................... 17

10.19 Fitting compatibility ............................................................................................... 17

11 Packaging and marking ................................................................................................. 18

12 Quality assurance .......................................................................................................... 18

Annex A (informative) Typical OPPC structures ................................................................... 19

---------------------- Page: 4 ----------------------
IEC 60794-4-30:2021 © IEC 2021 – 3 –

Annex B (informative) Installation example .......................................................................... 20

Annex C (informative) Packaging and marking ..................................................................... 22

Bibliography .......................................................................................................................... 23

Figure A.1 – OPPC example structures ................................................................................. 19

Figure B.1 – OPPC’s closure installation example with support method ................................ 20

Figure B.2 – OPPC’s closure installation example with suspension method .......................... 20

Figure B.3 – Closure installation example with dead-end ...................................................... 21

Figure B.4 – Closure installation example with a suspension clamp ...................................... 21

Table 1 – Cable design characteristics .................................................................................. 10

Table 2 – Lightning test conditions and parameters to be informed in the test report ............. 17

---------------------- Page: 5 ----------------------
– 4 – IEC 60794-4-30:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 4-30: Aerial optical cables along electrical power lines – Family
specification for optical phase conductor (OPPC) 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.

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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

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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

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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 60794-4-30 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical

committee 86: Fibre optics. It is an International Standard.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/2079/FDIS 86A/2088/RVD

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

the above table.
The language used for the development of this International Standard is English.

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.
---------------------- Page: 6 ----------------------
IEC 60794-4-30:2021 © IEC 2021 – 5 –

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.
---------------------- Page: 7 ----------------------
– 6 – IEC 60794-4-30:2021 © IEC 2021
OPTICAL FIBRE CABLES –
Part 4-30: Aerial optical cables along electrical power lines – Family
specification for optical phase conductor (OPPC) optical cables
1 Scope

This part of IEC 60794, which is a family specification, specifies the optical fibre, cable elements,

cable construction requirements, main requirements for installation and operating conditions,

cable design characteristics and test for OPPC (optical phase conductor), used for carrying

current as well as communication and data transmission. The corresponding environmental

declaration can be built according to IEC TR 62839-1.

The OPPC is a substitute for a conventional phase bare conductor containing optical fibres.

Usually, the fibres are embedded loosely in protective buffer tubes. To fulfil mechanical and

electrical requirements, an armouring of one or more layers with aluminium, aluminium alloy,

and aluminium clad steel, galvanized steel or a mixture of them is helically stranded.

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 60468, Method of measurement of resistivity of metallic materials
IEC 60793-1-40, Optical fibres – Part 1-40: Attenuation measurement methods

IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specifications for

class B single-mode fibres
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 test methods

IEC 60794-1-22, Optical fibre cables – Part 1-22: Generic specification – Basic optical cable

test procedures – Environmental test methods

IEC 60794-1-24, Optical fibre cables – Part 1-24: Generic specification – Basic optical cable

test procedures – Electrical test methods

IEC 60794-1-219, Optical fibre cables – Part 1-219: Generic specification – Basic optical cable

test procedures – Material compatibility test, method F19
____________
Under preparation. Stage at the time of publication: IEC/CCDV 60794-1-219:2020.
---------------------- Page: 8 ----------------------
IEC 60794-4-30:2021 © IEC 2021 – 7 –

IEC 60794-4, Optical fibre cables – Part 4: Sectional specification – Aerial optical cables along

electrical power lines
IEC 60888, Zinc-coated steel wires for stranded conductors
IEC 60889, Hard-drawn aluminium wire for overhead line conductors
IEC 61089, 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

IEC 62219, Overhead electrical conductors – Formed wire, concentric lay, stranded conductors

3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60794-1-1,

IEC 60794-4 and the following 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
3.1
optical phase conductor
OPPC

metallic hybrid optical cable that has the dual performance functions of a conventional phase

conductor with telecommunication capabilities
3.2
current-carrying capacity

calculated value for the maximum continuous current carrying capacity without degradation of

of any element of the cable under specific conditions

Note 1 to entry: The value depends on various parameters (e.g. solar, wind speed, ambient temperature).

Note 2 to entry: If the construction contains an aluminium tube or aluminium slotted core, these elements are

considered conductive parts.
3.3
operation temperature

steady state temperature the OPPC cable will reach during standard operation at the current

carrying capacity, without degradation of any element’s performance requirements under

specific conditions
3.4
emergency condition temperature

maximum temperature the OPPC cable will reach during emergency operation for a limited

period of time during cable’s lifetime without degradation of any element’s performance

requirements
---------------------- Page: 9 ----------------------
– 8 – IEC 60794-4-30:2021 © IEC 2021
3.5
emergency condition duration

OPPC cable’s accumulated period running in emergency temperature mode within its lifetime

4 Symbols and abbreviated terms

For the purpose of this document, the abbreviated terms given in IEC 60794-1-1 apply.

5 Optical fibre

Single-mode optical fibres which comply with the relevant part of IEC 60793-2-50 shall be used.

Fibres other than those specified above can be used, if agreed between the customer and

supplier. The cabled fibre shall conform to IEC 60794-4.

Any reflective discontinuity specified with the optical return loss measurement shall be greater

than 55,0 dB.

The test method best suited to provide the functional requirements shall be in accordance with

IEC 60793-1-40.
6 Cable elements
Refer to the relevant parts of the IEC 60794-4 series.

a) The optical fibre unit(s) shall house the optical fibres and protect them from damage due to

environmental or mechanical forces such as longitudinal compression, crushing, bending,

twisting, tensile stress, long- and short-term heat effects caused by environmental variations

or by atmospheric discharges.

b) For loose tube constructions, one or more primary coated fibres or optical elements are

packaged loosely in a tube construction, with a suitable water-blocking system. The tube(s)

may be fabricated from stainless steel, aluminium, aluminium alloy, or a heat-resistant non-

metallic material. The tube diameter shall be agreed between the customer and the supplier.

c) When used in the tube, the filling compound shall not flow at the cable maximum operation

temperature or freeze at its lowest operation temperature.

d) The wire types can be from one or more of the following standards and their mechanical

properties shall comply, before stranding, with the requirements of the standards indicated:

– aluminium alloy according to IEC 60104;
– zinc-coated steel according to IEC 60888;
– hard-drawn aluminum according to IEC 60889;
– aluminum-clad steel according to IEC 61232.

Other wire types can be considered; the requirements shall be agreed between customer

and manufacturer.
e) Each cable element shall be compatible.
7 Cable construction
7.1 General
Refer to the relevant parts of the IEC 60794-4 series.

An OPPC consists of bearing elements, conductor elements and optical fibre units. Usually,

optical fibre units are within the bearing elements.
---------------------- Page: 10 ----------------------
IEC 60794-4-30:2021 © IEC 2021 – 9 –

If the OPPC includes several tubes with fibres, it shall be possible to identify each individual

fibre and tube throughout the length of the cable. Use of an appropriate colour code is an

accepted methodology.

The stranded wires may be round according to IEC 61089 or have other cross-sectional shapes,

i.e. trapezoidal or z-form according to IEC 62219. Unless other requirements are mutually

agreed between the customer and the supplier, after stranding, the OPPC shall comply with

IEC 61089 or IEC 62219.

Typical OPPC structures with outer round wires are shown in Annex A. Formed wires can also

be used.
7.2 Anti-corrosion

In order to reduce the risk of corrosion, the wires on the strands and the tube protecting the

fibre optic cable element(s) should be composed of the same metal or be coated with grease.

If used, the type and the amount of grease to be applied shall be in accordance with IEC 61394

or shall be defined between the supplier and the customer.
8 Main installation requirements
8.1 General

Installation and operating conditions shall be agreed between customer and supplier. It is

recommended that a detailed study of the field conditions and technical information/support is

provided by the supplier or third party expert prior to the agreement. Installation of OPPC shall

match with its fittings and closures. Annex B gives some typical installation examples.

8.2 Installation methods and conditions of OPPC

Installation of OPPC is generally the same as that of overhead power lines conductors by

tension method and according to the manufacturer’s recommended procedure, slack stringing

is forbidden. Bending radius of OPPC for installation should be specified, and MIT shall be

according to Table 1. Installation mainly include how to
a) pay off and string OPPC;
b) install the fittings and adjust the sag of OPPC.

OPPC shall be extended from the cable reel by towing rope when deploying, and kept a loosen

arc all during the whole process. Special fixture or strained preformed line should be used when

the line is tightened. The sag and tension should be calculated according to the type, span and

weather condition of OPPC. The maximum pay off tension should not exceed MIT, and no extra

bending of the fibre which would damage or lower performance is allowed. The tensile force

should be less than 20 % of RTS when stringing, and the diameter of pay off guide wheels

should be at least 40 times of the OPPC diameter. V-groove type bull wheels should not be

used. The conductor reel should be placed in a straight line with tensioner to avoid conductor

binding. The use of neoprene, urethane lined dollies, sheaves, rollers or blocks, etc. is preferred.

Installation shall not be in bad weather such as wind and thunderstorm, and the installation

temperature should not be lower than −10 °C. OPPC installation should avoid surface friction

or damage. When replacing the OPPC, the new line should be connected with the old line and

anti-twisting measures taken. The old line should be used as a traction line, and the old fittings

should be removed after installation.
---------------------- Page: 11 ----------------------
– 10 – IEC 60794-4-30:2021 © IEC 2021
8.3 Installation methods and conditions of the fittings

The OPPC cable shall be terminated with suitable fittings relevant to the type of cable.

The fittings used on OPPC shall be matched mechanically and electrically. Factors affecting

the interaction between fitting and OPPC are as follows.

a) If the fittings are too small, the contact pressure of the fitting will exceed the designed

compression limit of OPPC.

b) If the fittings are too large, there will not be enough contact area, and the fitting will not have

enough tension and grip strength. Also, the contact current transmission capacity between

fittings and OPPC will be deficient affecting the current transmission capacity.

After fittings installation, the OPPC should be jointed, and the end of the OPPC should be

sealed properly if not equipped with closure immediately.

The type of fittings shall be approved between the customer and the supplier. The fittings

compatibility shall comply with 10.19.
8.4 Anti-twist
An anti-twist device can b
...

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