Optical fibre cables - Part 6-20: Indoor-outdoor cables - Family specification for flame retardant outdoor cables

IEC 60794-6-20:2020 is a family specification covering optical fibre outdoor cables which are flame retardant and thus also applicable to indoor environments. These cables generally possess the characteristics associated with outdoor cable designs having similar thermal and mechanical robustness that makes them suitable for use in the outside plant, while simultaneously exhibiting the fire performance required in indoor premises. A typical application is for example the extension of a "shorter length" of an outdoor cable into the building.

Câbles à fibres optiques - Partie 6-20: Câbles intérieurs/extérieurs - Spécification de famille pour les câbles extérieurs retardateurs de flamme

IEC 60794-6-20:2020 est une spécification de famille qui couvre les câbles extérieurs à fibres optiques ayant un caractère ignifugeant et qui s'applique donc également aux environnements intérieurs. Ces câbles possèdent généralement les caractéristiques associées à des conceptions de câbles extérieurs, présentant une robustesse thermique et mécanique similaire qui les rend appropriés pour une utilisation dans les environnements d'usine extérieurs, tout en présentant le comportement au feu exigé à l'intérieur des locaux. Une application type est par exemple la prolongation d'une longueur de câble extérieur trop courte dans le bâtiment.

General Information

Status
Published
Publication Date
28-Sep-2020
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
29-Sep-2020
Ref Project

Buy Standard

Standard
IEC 60794-6-20:2020 - Optical fibre cables - Part 6-20: Indoor-outdoor cables - Family specification for flame retardant outdoor cables
English and French language
42 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 60794-6-20
Edition 1.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibre cables –
Part 6-20: Indoor-outdoor cables – Family specification for flame retardant
outdoor cables
Câbles à fibres optiques –
Partie 6-20: Câbles intérieurs/extérieurs – Spécification de famille pour
les câbles extérieurs retardateurs de flamme
IEC 60794-6-20:2020-09(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2020 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite

ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des

questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez

les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org

The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,

variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English

committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.

and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary

details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and

once a month by email. French extracted from the Terms and Definitions clause of

IEC publications issued since 2002. Some entries have been

IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and

If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC

La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des

Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC

Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la

plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - Electropedia - www.electropedia.org

webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au

La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en

en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans

comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire

projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.

IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary

Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais

Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des

Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées

antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
---------------------- Page: 2 ----------------------
IEC 60794-6-20
Edition 1.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibre cables –
Part 6-20: Indoor-outdoor cables – Family specification for flame retardant
outdoor cables
Câbles à fibres optiques –
Partie 6-20: Câbles intérieurs/extérieurs – Spécification de famille pour
les câbles extérieurs retardateurs de flamme
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-8908-2

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 60794-6-20:2020 © IEC 2020
CONTENTS

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

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

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

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

4 General specifications ..................................................................................................... 7

4.1 Optical fibres .......................................................................................................... 7

4.2 Cable elements ....................................................................................................... 7

5 Specifications for flame retardant outdoor cables – Construction ..................................... 8

6 Details of family specifications and test conditions for flame retardant outdoor

cables.............................................................................................................................. 8

6.1 Applicable tests ...................................................................................................... 8

6.2 Mechanical tests ..................................................................................................... 9

6.2.1 General ........................................................................................................... 9

6.2.2 Tensile performance ...................................................................................... 10

6.2.3 Abrasion ........................................................................................................ 10

6.2.4 Crush ............................................................................................................ 11

6.2.5 Impact ........................................................................................................... 11

6.2.6 Repeated bending ......................................................................................... 11

6.2.7 Torsion .......................................................................................................... 12

6.2.8 Bend .............................................................................................................. 12

6.2.9 Bending under tension ................................................................................... 12

6.2.10 Kink ............................................................................................................... 12

6.2.11 Rip cord functional test .................................................................................. 12

6.3 Environmental tests .............................................................................................. 13

6.3.1 Temperature cycling ...................................................................................... 13

6.3.2 Water penetration .......................................................................................... 13

6.3.3 Ageing ........................................................................................................... 14

6.3.4 UV resistance ................................................................................................ 14

6.3.5 Environmental stress cracking ....................................................................... 14

6.3.6 Cable external freezing .................................................................................. 14

6.3.7 Compound flow .............................................................................................. 15

6.3.8 Bleeding and evaporation .............................................................................. 15

6.3.9 Material compatibility ..................................................................................... 15

6.4 Cable element tests .............................................................................................. 15

6.4.1 Ribbon strippability ........................................................................................ 15

6.4.2 Ribbon tear (separability) .............................................................................. 15

6.4.3 Ribbon dimensions and geometry .................................................................. 16

6.4.4 Ribbon torsion ............................................................................................... 16

6.4.5 Ribbon residual twist ..................................................................................... 16

6.4.6 Tube kinking .................................................................................................. 16

6.4.7 Bend test for optical cable elements .............................................................. 16

6.4.8 Stripping force stability of cabled fibres ......................................................... 16

6.5 Other tests ............................................................................................................ 17

6.5.1 Fire performance ........................................................................................... 17

6.5.2 Electrical continuity of cable metallic elements .............................................. 17

6.5.3 Thickness of non-metallic sheath ................................................................... 17

6.5.4 Overall dimensions ........................................................................................ 17

---------------------- Page: 4 ----------------------
IEC 60794-6-20:2020 © IEC 2020 – 3 –

Annex A (informative) Examples of flame retardant (FR) outdoor cables .............................. 19

Bibliography .......................................................................................................................... 20

Figure A.1 – Example of a stranded FR outdoor cable design ............................................... 19

Figure A.2 – Example of an FR outdoor cable with a central tube design .............................. 19

Table 1 – Tests applicable for mechanical and environmental performance of flame

retardant outdoor cables ......................................................................................................... 8

Table 2 – Low and high temperatures ................................................................................... 13

---------------------- Page: 5 ----------------------
– 4 – IEC 60794-6-20:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 6-20: Indoor-outdoor cables –
Family specification for flame retardant outdoor cables
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

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

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60794-6-20 has been prepared by subcommittee SC 86A: Fibres

and cables, of IEC technical committee 86: Fibre optics.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/2037/FDIS 86A/2051/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.
---------------------- Page: 6 ----------------------
IEC 60794-6-20:2020 © IEC 2020 – 5 –

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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 7 ----------------------
– 6 – IEC 60794-6-20:2020 © IEC 2020
OPTICAL FIBRE CABLES –
Part 6-20: Indoor-outdoor cables –
Family specification for flame retardant outdoor cables
1 Scope

This part of IEC 60794 is a family specification covering optical fibre outdoor cables which are

flame retardant and thus also applicable to indoor environments. These cables generally

possess the characteristics associated with outdoor cable designs having similar thermal and

mechanical robustness that makes them suitable for use in the outside plant, while

simultaneously exhibiting the fire performance required in indoor premises. A typical application

is for example the extension of a "shorter length" of an outdoor cable into the building.

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 60332-1 (all parts), Tests on electric and optical fibre cables under fire conditions – Part 1:

Test for vertical flame propagation for a single insulated wire or cable

IEC 60332-3 (all parts), Tests on electric and optical fibre cables under fire conditions – Part 3:

Test for vertical flame spread of vertically-mounted bunched wires or cables

IEC 60754-2, Test on gases evolved during combustion of materials from cables – Part 2:

Determination of acidity (by pH measurement) and conductivity

IEC 60793-2-10:2019, Optical fibres – Part 2-10: Product specifications – Sectional

specification for category A1 multimode fibres

IEC 60793-2-50:2018, Optical fibres – Part 2-50: Product specifications – Sectional

specification 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 60794-1-22:2017, Optical fibre cables – Part 1-22: Generic specification – Basic optical

cable test procedures – Environmental test methods

IEC 60794-1-23, Optical fibre cables – Part 1-23: Generic specification – Basic optical cable

test procedures – Cable element test methods

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

test procedures – Electrical test methods

IEC 60794-1-31:2018, Optical fibre cables – Part 1-31: Generic specification – Optical cable

elements – Optical fibre ribbon
---------------------- Page: 8 ----------------------
IEC 60794-6-20:2020 © IEC 2020 – 7 –

IEC 60794-1-215, Optical fibre cables – Part 1-215: Generic specification – Basic optical cable

test procedures – Environmental test methods – Cable external freezing test, Method F15

IEC 60794-3:2014, Optical fibre cables – Part 3: Outdoor cables – Sectional specification

IEC 60794-3-10:2015, Optical fibre cables – Part 3-10: Outdoor cables – Family specification

for duct, directly buried and lashed aerial optical telecommunication cables

IEC 60794-4:2018, Optical fibre cables – Part 4: Sectional specification – Aerial optical cables

along electrical power lines

IEC 60794-5:2014, Optical fibre cables – Part 5: Sectional specification – Microduct cabling for

installation by blowing

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 60811-406, 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 61034 (all parts), Measurement of smoke density of cables burning under defined

conditions

ISO 4892-2:2013, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-

arc lamps
3 Terms, definitions and abbreviated terms

For the purposes of this document, the terms and definitions 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 General specifications
4.1 Optical fibres

The optical fibre shall conform to the requirements of IEC 60793-2-10 or IEC 60793-2-50. The

fibre type shall be agreed between the customer and supplier. The cabled fibre shall conform

to IEC 60794-3.
4.2 Cable elements
The cable elements shall conform to IEC 60794-3, IEC 60794-4, IEC 60794-5.
---------------------- Page: 9 ----------------------
– 8 – IEC 60794-6-20:2020 © IEC 2020
5 Specifications for flame retardant outdoor cables – Construction

The cable design can be derived from a typical outdoor cable design according to the product

specifications described in IEC 60794-3. The specific demand related to flame retardancy will

require the appropriate selection of the jacket material in combination with other material and/or

design considerations. See Annex A for examples of flame retardant outdoor cables.

6 Details of family specifications and test conditions for flame retardant
outdoor cables
6.1 Applicable tests

Compliance with the specification shall be verified by carrying out tests selected from Table 1.

It is not intended that all tests in Table 1 be carried out in all cases. The tests to be applied and

the frequency of testing shall be agreed between the customer and supplier.
Table 1 – Tests applicable for mechanical and environmental
performance of flame retardant outdoor cables
Detail
Characteristics Test methods Remarks
specifications
Mechanical tests Typically required of most cable
designs
Tensile See 6.2.2 IEC 60794-1-21,
performance
method E1
Abrasion See 6.2.3 IEC 60794-1-21, Method E2A for sheath abrasion
method E2A, method E2B Method E2B, method 2, for
cable marking abrasion
Crush See 6.2.4 IEC 60794-1-21,
method E3A
Impact See 6.2.5 IEC 60794-1-21,
method E4
Repeated bending See 6.2.6 IEC 60794-1-21,
method E6
Torsion See 6.2.7 IEC 60794-1-21,
method E7
Bend See 6.2.8 IEC 60794-1-21, Default method E11A
method E11
Bending under See 6.2.9 IEC 60794-1-21, Diameter of mandrel should be
tension 40 x cable diameter.
method E18A, procedure 1
Load T as defined in 6.2.2.
Kink See 6.2.10 IEC 60794-1-21, method E10 Cable kink
Rip cord functional See 6.2.11 IEC 60794-1-21, method E25
Environmental
tests
Temperature See 6.3.1 IEC 60794-1-22,
cycling
method F1
Water penetration See 6.3.2 IEC 60794-1-22, F5B and F5C
method F5
Ageing See 6.3.3 IEC 60794-1-22,
method F9
---------------------- Page: 10 ----------------------
IEC 60794-6-20:2020 © IEC 2020 – 9 –
Characteristics Detail Test methods Remarks
specifications
UV resistance See 6.3.4 IEC 60794-1-22, Some jacket materials are
exempt from this test – see
method F14 (method ISO 4892-
6.3.4
Cable external
See 6.3.6 IEC 60794-1-215,
freezing
method F15A or F15B
Environmental See 6.3.5 IEC 60811-406 Highly filled thermoplastics (e.g.
stress cracking FRNC materials) are sensitive
to stress cracking. The test was
developed for PE and PP and
thus shall be adapted.
Compound flow See 6.3.7 IEC 60794-1-22, method F16
Bleeding and See 6.3.8 IEC 60794-1-23, method G9
evaporation
Material IEC 60794-1-219 should be
See 6.3.9
compatibility applied.
Cable element
tests
Ribbon strippability See 6.4.1 IEC 60794-1-23 If ribbons are used
method G10B
Ribbon tear See 6.4.2 IEC 60794-1-23, If ribbons are used
(separability)
method G5
Ribbon dimensions See 6.4.3 IEC 60794-1-23, method G2 If ribbons are used
and geometry
Ribbon torsion See 6.4.4 IEC 60794-1-23, method G6 If ribbons are used
Ribbon residual See 6.4.5 IEC 60794-1-23, method G8 If ribbons are used
twist
Tube kinking See 6.4.6 IEC 60794-1-23, If buffer tubes are used
method G7
Bend for optical See 6.4.7 IEC 60794-1-23, method G1
cable elements
Stripping force See 6.4.8 IEC 60794-1-23, method G10A
stability of cabled
optical fibres
Other tests
Fire performance See 6.5.1 IEC 60332-1 (all parts) Regional legal requirements
shall be fulfilled. For more
IEC 60332-3 (all parts)
details, see IEC TR 62222.
IEC 61034 (all parts)
IEC 60754-2

Electrical continuity See 6.5.2 IEC 60794-1-24, method H3 For cables with metallic

elements
Thickness of non- See 6.5.3 IEC 60811-202
metallic sheath
Overall dimensions See 6.5.4 IEC 60811-203
6.2 Mechanical tests
6.2.1 General

The general optical criteria in mechanical tests is no change in attenuation, as described in

IEC 60794-1-1.
---------------------- Page: 11 ----------------------
– 10 – IEC 60794-6-20:2020 © IEC 2020
In some environmental and installation tests, some increase is accepted.

The number of fibres tested shall be representative of the cable design according to fibre

sampling indicated in IEC 60794-1-1. Different sampling can be agreed between customer and

supplier.

The minimum acceptance criteria for the different designs of cables shall be indicated in the

product specification.

Test methods are defined in the generic specification IEC 60794-1-21, IEC 60794-1-22 and

IEC 60794-1-23. Fire retardant outdoor cables are generally designed according to

IEC 60794-3 with the addition of design characteristics to render them fire retardant to meet

the applicable fire requirements.
6.2.2 Tensile performance
a) Family specifications
While the cable is under short-term tensile load (T , rated tensile load),
• the axial fibre strain shall be < 60 % of the fibre proof strain, and

• the attenuation shall be measured and recorded. Any required change in attenuation

shall be agreed between customer and supplier.
While the cable is under the long-term tensile load (TL, residual load),
• The axial fibre strain shall be:

– < 20 % of fibre proof test, for fibre proof tested to ≤ 1 % strain (e.g., 0,69 GPa, 0,2 %

absolute strain), and

– < 17 % of fibre proof test, for fibre proof tested to greater than 1 % to 2 % strain (e.g.,

0,69 GPa to 1,38 GPa, 0,34 % absolute strain for 2 % proof tested fibre)

NOTE For fibres proof tested at levels above 1 % strain, the safe long-term load will not scale linearly

with proof strain, so a lower percentage of the proof stain is applicable. There is no agreement for strain

limits for proof tests above 2 % strain.
• The change in attenuation shall be:
single-mode fibre: no change;
multimode fibre: ≤ 0,2 dB.

Under visual examination without magnification, there shall be no damage to the sheath or

to the cable elements after the test.
b) Test conditions
Method: IEC 60794-1-21, method E1
Length under tension: > 50m
Tensile load on cable: Long-term (T ), short-term (T )
L M
T ≥ 1,5 x W

Other loads may be applied in accordance with particular user conditions, e.g. 2 700 N.

T = 0,3 x T
L M

Diameter of test pulleys: Typically 1 m but not less than the minimum loaded bending

diameter specified for the cable
6.2.3 Abrasion
a) Family specifications

Sheath abrasion: There shall be no perforation of the sheath after performing the needle

test according to method E2A of IEC 60794-1-21.

Cable marking abrasion: The print shall be legible after the test performed according to

method E2B of IEC 60794-1-21 (felt test).
---------------------- Page: 12 ----------------------
IEC 60794-6-20:2020 © IEC 2020 – 11 –
b) Test conditions
Method: IEC 60794-1-21, method E2A
Load: 2 N
Number of cycles: 50
Method IEC 60794-1-21, method E2B, method 2
Load: 4 N
Number of cycles: 3
Other loads and number of cycles may be agreed between customer and supplier.
6.2.4 Crush
a) Family specifications
Under the short term load, the attenuation change shall not exceed:
• 0,15 dB for single-mode fibres,
• 0,30 dB for multimo
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.