IEC 60794-2-50:2008

Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex and duplex cables for use in terminated cable assemblies

IEC 60794-2-50:2008 provides requirements for simplex and duplex optical fibre cables for use in terminated cable assemblies or for termination with optical fibre passive components. This standard cancels and replaces IEC/PAS 60794-2-50 published in 2004. This standard is to be used in conjunction with IEC 60794-1-1, IEC 60794-1-2 and IEC 60794-2.

Câbles à fibres optiques - Partie 2-50: Câbles intérieurs - Spécification de famille pour les câbles simplex et duplex utilisés dans les ensembles de câbles équipés

La CEI 60794-2-50:2008 donne les exigences pour les câbles simplex et duplex à fibres optiques utilisés dans des ensembles de câbles équipés ou en vue de la finition par des composants passifs à fibres optiques. La présente norme annule et remplace la CEI/PAS 60794-2-50 parue en 2004. La présente norme doit être lue conjointement avec la CEI 60794-1-1, la CEI 60794-1-2 et la CEI 60794-2.

General Information

• Status: Published
• Publication Date: 28-Apr-2008
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: SC 86A - Fibres and cables
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 10-Jan-2020

Relations

• Replaces: IEC PAS 60794-2-50:2004 - Optical fibre cables - Part 2-50: Indoor optical fibre cables - Family specification for simplex and duplex cables for use in patch cords
• Effective Date: 05-Sep-2023
• Revised: IEC 60794-2-50:2020 - Optical fibre cables - Part 2-50: Indoor cables - Family specification for simplex and duplex cables for use in terminated cable assemblies
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60794-2-50
Edition 1.0 2008-04
INTERNATIONAL
STANDARD
Optical fibre cables –
Part 2-50: Indoor cables – Family specification for simplex and duplex cables
for use in terminated cable assemblies

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.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
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
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IEC 60794-2-50
Edition 1.0 2008-04
INTERNATIONAL
STANDARD
Optical fibre cables –
Part 2-50: Indoor cables – Family specification for simplex and duplex cables
for use in terminated cable assemblies

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
V
ICS 33.180-10 ISBN 2-8318-9738-6

– 2 – 60794-2-50 © IEC:2008(E)

CONTENTS
FOREWORD.4

1 Scope.6

2 Normative references .6

3 Terms and definitions .7

4 Construction .7

4.1 General .7

4.2 Optical fibres and primary coating .7

4.3 Buffer .7
4.4 Tube.8
4.5 Strength and anti-buckling members .8
4.6 Sheath .8
4.7 Sheath marking .8
4.8 Examples of cable constructions .8
5 Tests .8
5.1 Dimensions .9
5.2 Mechanical requirements.9
5.2.1 Tensile performance.9
5.2.2 Crush .9
5.2.3 Impact .10
5.2.4 Repeated bending .10
5.2.5 Bend.10
5.2.6 Torsion .11
5.2.7 Bend at low temperature.11
5.2.8 Kink.11
5.2.9 Sheath pull-off force .11
5.2.10 Buffered fibre movement in compression .12
5.3 Environmental requirements .12
5.3.1 Temperature cycling .12
5.3.2 Sheath shrinkage.12
5.4 Transmission requirements .13
5.5 Fire performance.13
Annex A (informative) Examples of some types of cable construction .14

Annex B (normative) METHOD E21 – Sheath pull-off force for optical fibre cable for
use in patch cords .17
Annex C (normative) METHOD F11 – Sheath shrinkage for optical fibre cable for use
in patchcords .22
Annex D (normative) METHOD E22 – Buffered fibre movement under compression in
optical fibre cables for use in patchcords .24
Annex E (normative) METHOD F12 – Temperature cycling for optical fibre cable for
use in patchcords .26
Annex F (normative) – Guidance on the selection of tests applicable to optical fibre
cables for use in patchcords .28
Bibliography.31

Figure A.1 – Simplex loose non-buffered fibre cable .
Figure A.2 – Simplex ruggedized fibre cable .14

60794-2-50 © IEC:2008(E) – 3 –

Figure A.3 – Duplex loose non-buffered fibre cable.14

Figure A.4 – Duplex ruggedized fibre cable.15

Figure A.5 – Duplex ruggedized fibre zip cord.15

Figure A.6 – Duplex ruggedized flat cable.15

Figure A.7 – Duplex ruggedized round cable.16

Figure B.1 – Schematic of test arrangement .19

Figure B.2 – Example of pulling jig.20

Figure B.3 – Cable sample preparation .21

Figure D.1 – Test set up for fibre movement under compression.25

Table 1 – Dimensions of buffered fibres.8
Table 2 – Temperature cycling severities .12
Table F.1 – Cable test method summary.28
Table F.2 – Cable testing agreement .30

– 4 – 60794-2-50 © IEC:2008(E)

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
OPTICAL FIBRE CABLES –
Part 2-50: Indoor cables –
Family specification for simplex and duplex cables

for use in terminated cable assemblies

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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
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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 60794-2-50 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This standard cancels and replaces IEC/PAS 60794-2-50 published in 2004. This first edition
constitutes a technical revision.
This standard is to be used in conjunction with IEC 60794-1-1, IEC 60794-1-2 and
IEC 60794-2.
60794-2-50 © IEC:2008(E) – 5 –

The text of this standard is based on the following documents:

FDIS Report on voting
86A/1204/FDIS 86A/1223/RVD
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 2.

A list of all parts of IEC 60794 series, under the general title Optical fibre cables, can be
found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication will be issued at a later date.

----------
...

IEC 60794-2-50
Edition 1.0 2008-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 2-50: Indoor cables – Family specification for simplex and duplex cables for
use in terminated cable assemblies

Câbles à fibres optiques –
Partie 2-50: Câbles intérieurs – Spécification de famille pour les câbles simplex
et duplex utilisés dans les ensembles de câbles équipés

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 la CEI ou du Comité national de la CEI du pays du demandeur.

Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette

publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

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CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
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 corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
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in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
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IEC 60794-2-50
Edition 1.0 2008-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 2-50: Indoor cables – Family specification for simplex and duplex cables for
use in terminated cable assemblies

Câbles à fibres optiques –
Partie 2-50: Câbles intérieurs – Spécification de famille pour les câbles simplex
et duplex utilisés dans les ensembles de câbles équipés

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 33.180.10 ISBN 2-8318-9902-8
– 2 – 60794-2-50 © IEC:2008
CONTENTS
FOREWORD.4

1 Scope.6

2 Normative references .6

3 Terms and definitions .7

4 Construction .7

4.1 General .7

4.2 Optical fibres and primary coating .7

4.3 Buffer .7
4.4 Tube.8
4.5 Strength and anti-buckling members .8
4.6 Sheath .8
4.7 Sheath marking .8
4.8 Examples of cable constructions .8
5 Tests .8
5.1 Dimensions .9
5.2 Mechanical requirements.9
5.2.1 Tensile performance.9
5.2.2 Crush .9
5.2.3 Impact .10
5.2.4 Repeated bending .10
5.2.5 Bend.10
5.2.6 Torsion .11
5.2.7 Bend at low temperature.11
5.2.8 Kink.11
5.2.9 Sheath pull-off force .11
5.2.10 Buffered fibre movement in compression .12
5.3 Environmental requirements .12
5.3.1 Temperature cycling .12
5.3.2 Sheath shrinkage.13
5.4 Transmission requirements .13
5.5 Fire performance.13
Annex A (informative) Examples of some types of cable construction .14

Annex B (normative) METHOD E21 – Sheath pull-off force for optical fibre cable for
use in patch cords .17
Annex C (normative) METHOD F11 – Sheath shrinkage for optical fibre cable for use
in patchcords .22
Annex D (normative) METHOD E22 – Buffered fibre movement under compression in
optical fibre cables for use in patchcords .24
Annex E (normative) METHOD F12 – Temperature cycling for optical fibre cable for
use in patchcords .26
Annex F (normative) Guidance on the selection of tests applicable to optical fibre
cables for use in patchcords .28
Bibliography.

Figure A.1 – Simplex loose non-buffered fibre cable .14

60794-2-50 © IEC:2008 – 3 –
Figure A.2 – Simplex ruggedized fibre cable .14

Figure A.3 – Duplex loose non-buffered fibre cable.14

Figure A.4 – Duplex ruggedized fibre cable.15

Figure A.5 – Duplex ruggedized fibre zip cord.15

Figure A.6 – Duplex ruggedized flat cable.15

Figure A.7 – Duplex ruggedized round cable.16

Figure B.1 – Schematic of test arrangement .19

Figure B.2 – Example of pulling jig.20

Figure B.3 – Cable sample preparation .21
Figure D.1 – Test set up for fibre movement under compression.25

Table 1 – Dimensions of buffered fibres.8
Table 2 – Temperature cycling severities .12
Table F.1 – Cable test method summary.28
Table F.2 – Cable testing agreement .30

– 4 – 60794-2-50 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
OPTICAL FIBRE CABLES –
Part 2-50: Indoor cables –
Family specification for simplex and duplex cables

for use in terminated cable assemblies

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
transp
...