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: 2020 specifies requirements for simplex and duplex optical fibre cables for use in terminated cable assemblies or for termination with optical fibre passive components. This second edition cancels and replaces the first edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:  
update of the normative references;
review and update of parameters and requirements for mechanical tests and environmental tests;
Annex B has been removed and test method for sheath pull-off force evaluation refers to IEC 60794-1-21, method E21;
Annex C has been removed and test method for sheath shrinkage evaluation refers to IEC 60794-1-22, method F11;
Annex D has been removed and test method for buffered fibre movement under compression refers to IEC 60794-1-21, method E22;
Annex E has been removed and test method for temperature cycling evaluation refers to IEC 60794-1-22, method F12;
fibre type designations have been updated and the new wideband MM fibre is included as an option.  
Keywords: requirements for simplex and duplex optical fibre cables

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

IEC 60794-2-50:2020 donne les exigences pour les câbles simplex et duplex à fibres optiques utilisés dans des ensembles de câbles équipés ou en vue d’être équipés par des composants passifs à fibres optiques. Cette deuxième édition annule et remplace la première édition parue en 2008. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  
mise à jour des références normatives;
révision et mise à jour des paramètres et des exigences pour les essais mécaniques et les essais d’environnement;
l’Annexe B a été retirée et la méthode d’essai pour l’évaluation de la force d’arrachage de la gaine fait référence à la méthode E21 de l’IEC 60794-1-21;
l’Annexe C a été retirée et la méthode d’essai pour l’évaluation de la rétraction de la gaine fait référence à la méthode F11 de l’IEC 60794-1-22;
l’Annexe D a été retirée et la méthode d’essai pour le mouvement des fibres sous revêtement protecteur sous l’effet d’une compression fait référence à la méthode E22 de l’IEC 60794-1-21;
l’Annexe E a été retirée et la méthode d’essai pour les cycles de température fait référence à la méthode F12 de l’IEC 60794-1-22;
mise à jour des désignations de types de fibres et ajout d’une nouvelle fibre MM à large bande facultative.  
Mots clés: câbles simplex et duplex à fibres optiques

General Information

Status
Published
Publication Date
09-Jan-2020
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
10-Jan-2020
Ref Project

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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
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IEC 60794-2-50
Edition 2.0 2020-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
IEC 60794-2-50:2020-01(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60794-2-50
Edition 2.0 2020-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-7732-4

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 60794-2-50:2020 © IEC 2020
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 ............................................................................................................................... 9

5.1 General ................................................................................................................... 9

5.2 Dimensions ............................................................................................................. 9

5.3 Mechanical requirements ........................................................................................ 9

5.3.1 Tensile performance ........................................................................................ 9

5.3.2 Crush ............................................................................................................ 10

5.3.3 Impact ........................................................................................................... 10

5.3.4 Repeated bending ......................................................................................... 11

5.3.5 Bend .............................................................................................................. 11

5.3.6 Torsion .......................................................................................................... 11

5.3.7 Bend at low temperature ................................................................................ 12

5.3.8 Kink ............................................................................................................... 12

5.3.9 Sheath pull-off force ...................................................................................... 12

5.3.10 Abrasion resistance of cable marking ............................................................ 13

5.3.11 Buffered fibre movement under compression ................................................. 13

5.4 Environmental requirements ................................................................................. 13

5.4.1 Temperature cycling ...................................................................................... 13

5.4.2 Shrinkage (informative) .................................................................................. 14

5.5 Transmission requirements ................................................................................... 14

5.6 Fire performance .................................................................................................. 14

Annex A (informative) Examples of types of cable constructions ......................................... 15

Annex B (informative) Guidance on the selection of tests applicable to optical fibre

cables for use in patchcords ................................................................................................. 18

Bibliography .......................................................................................................................... 21

Figure A.1 – Simplex loose non-buffered fibre cable ............................................................. 15

Figure A.2 – Simplex fibre cable ........................................................................................... 15

Figure A.3 – Duplex loose non-buffered fibre cable ............................................................... 16

Figure A.4 – Duplex fibre cable ............................................................................................. 16

Figure A.5 – Duplex fibre zip cord ......................................................................................... 16

Figure A.6 – Duplex flat cable ............................................................................................... 17

Figure A.7 – Duplex round cable (breakout cable) ................................................................. 17

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IEC 60794-2-50:2020 © IEC 2020 – 3 –

Table 1 – Dimensions of buffered fibres .................................................................................. 8

Table 2 – Temperature cycling ranges according to the application environment................... 14

Table B.1 – Cable test method summary ............................................................................... 18

Table B.2 – Blank detail specification for cable testing agreement ........................................ 20

---------------------- Page: 5 ----------------------
– 4 – IEC 60794-2-50:2020 © IEC 2020
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

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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 60794-2-50 has been prepared by subcommittee 86A: Fibres and

cables, of IEC technical committee 86: Fibre optics.

This second edition cancels and replaces the first edition published in 2008. This edition

constitutes a technical revision.

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

edition:
a) update of the normative references;

b) review and update of parameters and requirements for mechanical tests and environmental

tests;

c) Annex B has been removed and test method for sheath pull-off force evaluation refers to

IEC 60794-1-21, method E21;

d) Annex C has been removed and test method for sheath shrinkage evaluation refers to

IEC 60794-1-22, method F11;
---------------------- Page: 6 ----------------------
IEC 60794-2-50:2020 © IEC 2020 – 5 –

e) Annex D has been removed and test method for buffered fibre movement under compression

refers to IEC 60794-1-21, method E22;

f) Annex E has been removed and test method for temperature cycling evaluation refers to

IEC 60794-1-22, method F12;

g) fibre type designations have been updated and the new wideband MM fibre is included as

an option.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1972/FDIS 86A/1978/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 the parts in the IEC 61340 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.

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 60794-2-50:2020 © IEC 2020
OPTICAL FIBRE CABLES –
Part 2-50: Indoor cables – Family specification for simplex
and duplex cables for use in terminated cable assemblies
1 Scope

This part of IEC 60794 is a family specification that specifies requirements for simplex and

duplex optical fibre cables for use in terminated cable assemblies or for termination with optical

fibre passive components.
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 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures – Fibre

geometry

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 60793-2-10, Optical fibres – Part 2-10: Product specifications – Sectional specification for

category A1 multimode fibres

IEC 60793-2-50, 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 60794-1-2, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test

procedures – General guidance

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

test procedures – Mechanical tests methods

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

test procedures – Environmental tests methods

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

test procedures – Cable element test methods

IEC 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification

---------------------- Page: 8 ----------------------
IEC 60794-2-50:2020 © IEC 2020 – 7 –

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
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60794-1-1 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
terminated cable assembly
short length of cable provisioned with a connector at both ends

Note 1 to entry: Examples from ISO/IEC 11801 (all parts) are fibre optic cords used to establish connections on

patch panels, equipment and at work areas or to connect outlets to the terminal equipment.

4 Construction
4.1 General

In addition to the constructional requirements in IEC 60794-2, the following considerations

apply to simplex and duplex indoor cables for use in terminated cable assemblies.

It is not the intention of this document to specify the finished terminated cable assembly

complete with terminations.

There shall be no fibre splice in a delivery length. It shall be possible to identify each individual

fibre throughout the length of the cable.
4.2 Optical fibres and primary coating

Multimode or single-mode optical fibres meeting the requirements of IEC 60793-2-10

sub-categories A1-OM1 and A1-OM2 to A1-OM5 or IEC 60793-2-50 class B shall be used.

4.3 Buffer

If a tight or semi-tight (loosely applied) buffer is required, it shall consist of one or more layers

of inert material. Semi-tight tubes may be filled. Unless otherwise specified, the tight buffer

shall be removable in one operation together with fibre coating over a specified length. For

semi-tight and loose buffer, the buffer material is stripped off for a specified length leaving the

primary coating of the fibre intact.
Specified buffer strippability lengths:
– tight: 15 mm;
– semi tight: 300 mm;
– loose: 1,0 m minimum.
---------------------- Page: 9 ----------------------
– 8 – IEC 60794-2-50:2020 © IEC 2020

Strip force shall comply to the values stated in the relevant specification and the evaluation

shall be carried out according IEC 60793-1-32.
Buffer dimensions are shown in Table 1.
Table 1 – Dimensions of buffered fibres
Nominal diameter Tolerances
mm mm
0,3 to 0,9 ±0,05

Lower tolerance levels can be a requirement for buffered fibres having a low nominal diameter

within the specified range. In such cases, tolerance values shall be agreed between supplier

and customer.
4.4 Tube

One or two primary coated or buffered fibres are packaged (loosely or not) in a tube construction

which may be filled. The tube may be reinforced with a composite wall.

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.
4.5 Strength and anti-buckling members

The cable shall be designed with sufficient strength members to meet the requirements of this

document.

The strength and/or anti-buckling member may be either metallic or non-metallic and may be

located in the cable core and/or under the sheath and/or in the sheath.
4.6 Sheath

The cable shall have a uniform overall protective sheath. The cable diameter shall be specified

in the relevant detail specification (or product specification). Sheath removal is an important

feature of these cables. Sheath pull-off force shall be determined in accordance with

IEC 60794-1-21, method E21.
4.7 Sheath marking

If required, the cable shall be marked as agreed between the customer and supplier. The

marking shall be resistant to abrasion, which shall be verified in accordance with

IEC 60794-1-21, method E2B, method 2.
4.8 Examples of cable constructions
Examples of some main types of cable construction are shown in Annex A.

Other configurations are not excluded if they meet the mechanical, environmental, transmission

and termination requirements given in this document.
---------------------- Page: 10 ----------------------
IEC 60794-2-50:2020 © IEC 2020 – 9 –
5 Tests
5.1 General

Compliance with the specification requirements shall be verified by carrying out tests selected

from Clause 5. It is not intended that all tests be carried out in all cases, and Annex B provides

guidance on the selection of tests. The tests to be applied and the frequency of testing shall be

agreed between the customer and supplier.

Some of the following tests can be performed on a short sample length of cable which is still an

integral part of a longer length, thus making it possible to detect permanent changes in

attenuation. As a general requirement for the tests specified in this document, the spirit is to

keep "no change in attenuation" criteria at the end of each evaluation, although the parameters

specified in this document may be affected by measurement uncertainty arising either from

measurement errors or calibration errors. The optical total uncertainty of measurement for this

document shall be ±0,05 dB for singlemode fibres and ±0,2 dB for multimode fibres. Any

measured value within this range shall be considered as "no change in attenuation".

Cabled single-mode fibres are measured at 1 550 nm or 1 625 nm and shall be agreed between

the customer and supplier. Cabled multimode fibres are measured at 850 nm or 1 300 nm and

shall be agreed between the customer and supplier. Measurements shall be carried out

according to IEC 60793-1-40.

NOTE The optimized wavelength for multimode fibres A1-OM3 and A1-OM4 is 850 nm and for A1-OM5 fibre, the

targeted operational wavelength(s) is between 850 nm and 950 nm.

If loops are used within a test to fix the ends of a cable, the loop diameter shall be equal or

greater than the specified minimum cable bend diameter to avoid cable damage and excessive

mode filtering in multimode fibre.

Unless otherwise specified, all tests shall be carried out at expanded test conditions as

specified in IEC 60794-1-2.
5.2 Dimensions

The fibre dimensions and tolerances shall be checked in accordance with test method

IEC 60793‑1‑20 or IEC 60793‑1‑21. The diameter of the buffer and of the cable, as well as the

thickness of the sheath, shall be measured in accordance with the methods of IEC 60811-202

and IEC 60811-203.
The cable diameter tolerance shall be ±0,2 mm.

The deviation of the average sheath thickness shall be within the tolerance of ±0,1 mm for

100 % of the cable length.
5.3 Mechanical requirements
5.3.1 Tensile performance
Method: IEC 60794-1-21, E1

Diameter of chuck drums and transfer devices: not less than the minimum loaded bending

diameter specified for the cable, at least 250 mm diameter.
Load for 5 min:

– simplex cables d < 1,2 mm at 50 N; simplex cables 1,2 mm ≤ d ≤ 2,0 mm at 70 N; simplex

cables d > 2,0 mm at 100 N;
– duplex round cables at 100 N;
---------------------- Page: 11 ----------------------
– 10 – IEC 60794-2-50:2020 © IEC 2020
– zipcord cables d ≤ 2,0 mm at 140 N; zipcord cables d > 2,0 mm at 200 N.

Length of sample: sufficient to achieve the desired accuracy of measurement of attenuation

change shall be agreed between the customer and supplier.
Requirements:
– in all cases, fibre strain shall be less than 0,6 %;

– the maximum allowable increase in attenuation during the test shall be specified in the

product specification; there shall be no change in attenuation after the test;
– there shall be no damage to the cable elements.
5.3.2 Crush
Method: IEC 60794-1-21, E3A
Force short term:
– 300 N for simplex/duplex cables with diameter ≤ 2,0 mm;
– 500 N for simplex/duplex cables with diameter > 2,0 mm.
Duration short term: 1 min
Number of crushes short term: 1
Force long term:
– 100 N for simplex/duplex cables with diameter ≤ 2,0 mm;
– 200 N for simplex/duplex cables with diameter > 2,0 mm.
Duration long term: 10 min

Number of crushes long term: 1, separated at least 500 mm to any other loaded position.

Requirements:

– the maximum increase in attenuation during the test with a long term force shall be specified

in the product specification; there shall be no change in attenuation after the test with short

term and long term force;
– there shall be no damage to the cable elements.

For cables having a non-circular cross section, the force shall be applied in the direction of the

minor axis (perpendicular to the major axis).
5.3.3 Impact
Method: IEC 60794-1-21, E4

– impact energy: 0,5 J for simplex/duplex cables with diameter ≤ 2,0 mm; 1,0 J for

simplex/duplex cables with diameter > 2,0 mm;
– number of impacts: at least 3, each separated at least 500 mm.
Requirements:

– there shall be no change in attenuation after the test; there shall be no damage to the cable

elements;

– any imprint of the striking surface on the cable sheath is not considered mechanical damage.

---------------------- Page: 12 ----------------------
IEC 60794-2-50:2020 © IEC 2020 – 11 –

For cables having a non-circular cross section, the force shall be applied in the direction of the

minor axis (perpendicular to the major axis).
5.3.4 Repeated bending
Method: IE
...

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