SIST EN 60794-3-20:2004

SLOVENSKI SIST EN 60794-3-20:2004

STANDARD
september 2004
Kabli iz optičnih vlaken – 3-20. del: Zunanji kabli - Rodovna specifikacija za
optične samo-podporne zračne telekomunikacijske kable (IEC 60794-3-
20:2002, prirejen)*
Optical fibre cables - Part 3-20: Outdoor cables - Family specification for optical self-
supporting aerial telecommunication cables (IEC 60794-3-20:2002, modified)
ICS 33.180.10 Referenčna številka
SIST EN 60794-3-20:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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NORME CEI
INTERNATIONALE IEC
60794-3-20
INTERNATIONAL
Première édition
STANDARD
First edition
2002-03
Câbles à fibres optiques –
Partie 3-20:
Câbles extérieurs –
Spécification de famille pour les câbles optiques
de télécommunication aériens autoporteurs
Optical fibre cables –
Part 3-20:
Outdoor cables –
Family specification for optical self-supporting
aerial telecommunication cables
© IEC 2002 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in
microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
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CODE PRIX
Commission Electrotechnique Internationale
P
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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60794-3-20 © IEC:2002 – 3 –
CONTENTS
FOREWORD.5
1 Scope.9
2 Normative references.9
3 Symbols .11
4 Family specification for optical self-supporting aerial telecommunication cables
(blank detail specification and minimum requirements).13
4.1 Cable description.13
4.2 Optical fibres .17
4.2.1 Single-mode dispersion unshifted (B1.1) optical fibre .17
4.2.2 Single-mode dispersion shifted (B2) optical fibre .17
4.2.3 Single-mode non-zero dispersion (B4) optical fibre.19
4.3 Cable element .19
4.4 Cable construction.21
4.5 Installation and operating conditions .23
4.5.1 Tests applicable.23
4.5.2 Installation conditions (under consideration).23
4.6 Mechanical and environmental tests.25
4.6.1 Tests applicable.25
4.6.2 Details on family requirements and test conditions for optical fibre
cable tests .27

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60794-3-20 © IEC:2002 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
OPTICAL FIBRE CABLES –
Part 3-20: Outdoor cables –
Family specification for optical self-supporting aerial
telecommunication cables
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60794-3-20 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/750/FDIS 86A/763/RDV
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 3.
IEC 60794 consists of the following parts under the general title Optical fibre cables
Part 1: Generic specification
Part 2: Sectional specification – Indoor cables
Part 3: Sectional specification – Outdoor cables
Part 4: Sectional specification – Aerial optical cables along electrical lines (under consideration)

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60794-3-20 © IEC:2002 – 7 –
The committee has decided that the contents of this publication will remain unchanged
until 2005. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

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60794-3-20 © IEC:2002 – 9 –
OPTICAL FIBRE CABLES –
Part 3-20: Outdoor cables –
Family specification for optical self-supporting aerial
telecommunication cables
1 Scope
This part of IEC 60794 is a family specification that covers optical self-supporting aerial
telecommunication cables. Requirements of the sectional specification IEC 60794-3 for duct,
buried and aerial cables are applicable to cables covered by this standard.
Self-supporting aerial telecommunication cable in this context means a cable construction
having sufficient strength members and designed to be suspended on poles and similar
devices without the aid of another supporting wire or conductor.
Clause 5 of this standard describes a blank detail specification for optical self-supporting aerial
telecommunication cables. It incorporates some minimum requirements.
Detail specifications may be prepared on the basis of this family specification.
The parameters specified in this standard may be affected by measurement uncertainty arising
either from measurement errors or calibration errors due to lack of suitable standards.
Acceptance criteria should be interpreted with respect to this consideration (see IEC 60794-3
clause 9).
The number of fibres tested is representative of the cable design and should be agreed
between the user and the manufacturer.
2 Normative references
The following referenced documents are indispensable for the application 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 60304:1982, Standard colours for insulation for low-frequency cables and wires
IEC 60793-1-20:2001, Optical fibres – Part 1-20: Measurement methods and test procedures –
Fibre geometry
IEC 60793-1-40:2001, Optical fibres – Part 1-40: Measurement methods and test procedures –
Attenuation
IEC 60793-1-44:2001, Optical fibres – Part 1-44: Measurement methods and test procedures –
Cut-off wavelength
IEC 60793-2:1998, Optical fibres – Part 2: Product specifications

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60794-3-20 © IEC:2002 – 11 –
IEC 60794-1-1:2001, Optical fibre cables – Part 1-1: Generic specification – General
IEC 60794-1-2:1999, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable
test procedures
IEC 60794-3:2001, Optical fibre cables – Part 3: Sectional specification – Outdoor cables
IEC 60811-1-1:1993, Common test methods for insulating and sheathing materials of electric
cables and optical cables – Part 1-1: Methods for general application – Measurement of
thickness and overall dimensions – Tests for determining the mechanical properties
IEC 60811-5-1:1990, Common test methods for insulating and sheathing materials of electric
cables – Part 5: Methods specific to filling compounds. Section one – Drop-point – Separation
of oil – Lower temperature brittleness – Total acid number – Absence of corrosive components
– Permittivity at 23 °C – D.C. resistivity at 23 °C and 100 °C
3 Symbols
For the purposes of this part of IEC 60794 the following symbols apply.
λ Cabled fibre cut-off wavelength
cc
d Nominal outer diameter of the cable
DS Detail specification
T Threshold tensile load below which no attenuation and/or fibre strain increase should
O
occur in the tensile performance test
T The acceptable amount of short-term tensile load that can be applied to the cable
M
without permanent degradation of the characteristics of the fibres in the tensile
performance test
T Temperature cycling test low-temperature limit according to IEC 60794-1-2, Method F1
A1
T Temperature cycling test low-temperature limit according to IEC 60794-1-2, Method F1
A2
T Temperature cycling test high-temperature limit according to IEC 60794-1-2, Method F1
B1
T Temperature cycling test high-temperature limit according to IEC 60794-1-2, Method F1
B2
t Temperature cycling test dwell time
1
n × d A value times cable outer diameter used for bends, mandrels, etc.

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60794-3-20 © IEC:2002 – 13 –
4 Family specification for optical self-supporting aerial telecommunication
cables (blank detail specification and minimum requirements)
4.1 Cable description
(1) Prepared by (2) Document No:
Issue:
Date:
(3) Available from: (4) Generic specifications: IEC 60794-1-1 and IEC 60794-1-2
Sectional specification: IEC 60794-3
(5) Additional references:
(6) Cable description:
(7) Cable construction:
Optical fibres
Range of fibre count
Modularity
Construction Additional remarks
– Single-coloured fibre
– Tube – filled
– Tube – unfilled
– Slotted core – filled
– Slotted core – unfilled
– Tight secondary coating
– Ribbon in slotted core
– Ribbon in tube
– Tube in tube
– Central member – metallic
– Central member – non-metallic
– Core filling – jelly
– Core filling – water swellable materials
Lay-up
– Stranding (helical or SZ)
– Single unit
– Hybrid configuration
Insulated copper conductors
Inner sheath
Peripheral strength member
– Metallic
– Non-metallic
Moisture barrier
– Single-coated aluminium tape
– Double-coated aluminium tape
– Double-coated steel tape
– Hermetic barrier (metal tube)
Outer sheath
Additional armouring
– Non-metallic armouring
– Metallic armouring
Additional outer sheath
"Figure 8" construction
– Metallic suspension strand
– Non-metallic suspension strand
Circular self-supporting construction
Marking identification
– Customer requirement
– Identification of manufacturer

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60794-3-20 © IEC:2002
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