IEC 61300-2-5:2022

IEC 61300-2-5
®

Edition 4.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 2-5: Tests – Torsion

Dispositifs d’interconnexion et composants passifs fibroniques – Procédures
fondamentales d’essais et de mesures –
Partie 2-5: Essais – Torsion

IEC 61300-2-5:2022-09(en-fr)

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IEC 61300-2-5

®


Edition 4.0 2022-09




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –

Part 2-5: Tests – Torsion




Dispositifs d’interconnexion et composants passifs fibroniques – Procédures

fondamentales d’essais et de mesures –


Partie 2-5: Essais – Torsion













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.180.20 ISBN 978-2-8322-5689-3




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

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– 2 – IEC 61300-2-5:2022 © IEC 2022
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General description . 6
5 Apparatus . 6
5.1 General . 6
5.2 Mounting fixture for component or device . 7
5.3 Clamp/mandrel. 7
5.4 Tensile load . 7
5.5 Measurement equipment . 8
6 Procedure . 8
6.1 Preparation of DUT . 8
6.2 Preconditioning . 8
6.3 Mount the device under test . 8
6.4 Measure of initial optical properties . 8
6.5 Clamp the cable and apply the tensile load . 8
6.6 Monitoring sealing performance of closures . 8
6.7 Monitoring optical properties . 9
6.8 Twist the cable . 9
6.9 Recovery . 9
6.10 Final measurements and examinations . 9
7 Severity . 10
8 Details to be specified and reported. 11
Bibliography . 12

Figure 1 – Component or device test set-up . 6
Figure 2 – Protective housing test set-up . 7

Table 1 – Recommended severity levels . 10

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IEC 61300-2-5:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 2-5: Tests – Torsion

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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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
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6) All users should ensure that they have the latest edition of this publication.
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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.
IEC 61300-2-5 has been prepared by subcommittee 86B: Fibre optic interconnecting devices
and passive components, of IEC technical committee 86: Fibre optics. It is an International
Standard.
This fourth edition cancels and replaces the third edition published in 2009. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The terms and definitions clause was added;
b) the procedure description was modified;
c) new subsections are included in Clause 6 for a better sequence description;
d) Figure 1 was improved and Figure 2 was updated in text descriptions;

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– 4 – IEC 61300-2-5:2022 © IEC 2022
e) the severity of the test was updated according to the component and operation conditions.
The text of this International Standard is based on the following documents:
Draft Report on voting
86B/4641/FDIS 86B/4662/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.
A list of all parts of IEC 61300 series, published under the general title Fibre optic
interconnecting devices and passive components – Basic test and measurement procedures,
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 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.

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IEC 61300-2-5:2022 © IEC 2022 – 5 –
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 2-5: Tests – Torsion



1 Scope
The purpose of this part of IEC 61300 is to determine the ability of the cable attachment element
of the device under test (DUT) to withstand torsional loads that can be experienced during
installation and normal service.
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 60529, Degrees of protection provided by enclosures (IP Code)
IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
IEC 61300-2-38, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-38: Tests – Sealing for pressurized fibre optic closures
IEC 61300-3-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-1: Examinations and measurements – Visual examination
IEC 61300-3-3, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-3: Examinations and measurements – Active monitoring of
changes in attenuation and return loss
IEC 61300-3-4, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-4: Examinations and measurements – Attenuation
IEC 61300-3-6, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-6: Examinations and measurements – Return loss
IEC 61300-3-28, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-28: Examinations and measurements – Transient loss
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61300-1 apply.

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– 6 – IEC 61300-2-5:2022 © IEC 2022
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 General description
The cable-to-device attaching points are subjected to a torsional load or twisting action to
determine the effects of this action on optical performance and physical integrity of the DUT.
5 Apparatus
5.1 General
The test apparatus shall be capable of applying simultaneously tension and a torsional load or
twisting action to the cable-to-component-or-device attaching point. Figure 1 and Figure 2 show
basic test arrangement examples for a component or device and protective housing test set-up,
respectively.

Key
d diameter of fibre, cord or cable
D mandrel diameter
L distance from rearmost portion of the cable fixing component to mandrel.
NOTE Source and detector can be exchanged.
Figure 1 – Component or device test set-up

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IEC 61300-2-5:2022 © IEC 2022 – 7 –

Key
1 ,2, 3, 4 sequence of twist on each cycle
L distance from fixed component to clamping point.
Figure 2 – Protective housing test set-up
5.2 Mounting fixture for component or device
The mounting fixture should be rigidly based to hold the DUT properly aligned and allow stable
optical connection for monitoring optical properties during the test as required by the relevant
specification.
5.3 Clamp/mandrel
The mandrel or clamp is the point at which the torsional load is applied. This point can also be
used to attach a weight to apply the tension load when specified; in this case, the clamp may
consist of a capstan or mandrel.
If used, the capstan or mandrel shall be of diameter D at least 25 times the diameter d of the
fibre, cord or cable of the DUT and shall be located at a distance L, measured from the rearmost
portion of the cable fixing component, to the tangent point on mandrel as indicated in Figure 1.
Use sufficient turns around the mandrel to grasp and secure the fibre, cord or cable so that it
does not turn or slip in the holder when loads are applied.
The clamp, indicated in Figure 2, shall not crush the optical fibres of the DUT nor cause a
change in the attenuation.
Unless otherwise specified in the relevant specification, the clamping distance L for connectors,
passive components or splices shall be 250 mm ± 50 mm and 400 mm ± 50 mm for hardened
connectors, wall outlets, boxes, optical distribution frame modules (ODFM), closures and street
cabinets. For devices that include rigid cables with diameter > 25 mm, the clamping distance,
L, shall be 1 000 mm ± 5 mm.
5.4 Tensile load
Tension load to be applied on the DUT shall be specified in the relevant specification. Required
tensile load may be created by weights or another suitable mechanism. Values of recommended
loads are given in Table 1. In the case of duplex cordage, the loads shall not be doubled and
the cordage shall be bent over the mandrel in the minor axis direction.

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– 8 – IEC 61300-2-5:2022 © IEC 2022
5.5 Measurement equipment
For optical properties measurement, the equipment and measurement methods shall be
according IEC 61300-3-4 for attenuation and IEC 61300-3-6 for return loss measurement. For
active monitoring of changes in attenuation and return loss, the measurement equipment shall
be according IEC 61300-3-3 or IEC 61300-3-28. The optical performance measurement shall
be performed at the wavelength(s) specified in the relevant specification. When sealing
performance is requested to be evaluated, the equipment and measurement method shall be
according IEC 61300-2-38 and visual examination shall be applied according IEC 61300-3-1.
6 Procedure
6.1 Preparation of DUT
Prepare and clean the DUT according to the manufacturer’s instructions or as specified in the
relevant specification. The DUT shall be terminated onto a sufficient length of fibre cable to
facilitate interfacing with the optical measurement equipment.
6.2 Preconditioning
Pre-condition the DUT for at least 2 h at the standard atmospheric conditions specified in
IEC 61300-1, unless otherwise specified in the relevant specification. If the test is performed at
other ambient temperatures, allow at least 4 h of conditioning.
6.3 Mount the device under test
The DUT shall be rigidly mounted to a mounting fixture or device, which is secured in a fixed
position (see Figure 1 and Figure 2).
6.4 Measure of initial optical properties
Measure the optical properties specified in the detail specification, such as attenuation and
return loss. These values shall be recorded and used as a reference for the test evaluation.
6.5 Clamp the cable and apply the tensile load
The clamp, or mandrel if used to apply a load, shall be fastened to the cable in such a manner
that the optical fibre or cable is not crushed. The length of the clamp shall be specified in the
detail specification or as indicated in 5.3 (see Figure 1 and Figure 2). Gradually apply the tensile
load, as recommended in Table 1 or as specified in the relevant specification, to the clamp,
being careful to avoid any sudden jerking or straining of cable.
After the load is applied, it is recommended to re-measure the optical properties of the DUT.
NOTE If changes on optical properties are observed at this step, this can be indication of residual stress in the
DUT.
6.6 Monitoring sealing performance of closures
When sealing performance of sealed closures is requested, the DUT shall be pressurized and
sealed off at the test temperature. An over-pressure of 20 kPa ± 2 kPa for categories G and A
closures and 40 kPa ± 2 kPa for category S closures shall be used. For closures used in
pressurized networks, the evaluation should be carried out at 98,0 kPa ± 9,8 kPa over-pressure
level. For continuously monitoring pressure during the test, a pressure gage device shall be
attached to the DUT. The change in pressure (pressure loss) shall be monitored according to
IEC 61300-2-38, method B.
The gage device shall not be disconnected from the DUT until the end of the test.

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IEC 61300-2-5:2022 © IEC 2022 – 9 –
6.7 Monitoring optical properties
When monitoring of optical performance is requested, the optical properties shall be measured
at the specified interval or in the position of the twist angle as specified in the relevant
specification. The change in optical properties, such as attenuation and return loss of the DUT,
shall be monitored during and after the load and twist angles are applied, as described in
IEC 61300-3-3 or IEC 61300-3-28, unless otherwise specified in the relevant specification. Any
deviation in the DUT attenuation or return loss from that measured in 6.4 shall be considered
attributable to the cable/device attaching point, fibre-to-fibre interfaces or fibre-to-
source/detector interfaces in the device. In the case of connector plugs, record whether the
connector plug uncouples during test.
If there are unacceptable changes in optical properties and it is questionable whether the device
or cable itself can be at fault, a control test to determine the cable contribution shall be
performed in the same manner using a piece of cable and two cable clamps.
6.8 Twist the cable
Apply a twisting motion to the mandrel or clamp, being careful to control the vertical and
horizontal motion of the load. One twist cycle shall consist of a twist angle (as indicated in
Table 1 or in the relevant specification) in one direction, a return to the original position, a twist
angle (as indicated in the relevant specification or in Table 1) in the opposite direction and a
final return to the original position. Repeat the twist cycle as many times as specified in the
relevant specification or as indicated in Table 1.
After completion of the cable twist cycling, remove the tensile load (when applicable) and
remove the mandrel or clamp.
6.9 Recovery
Unless otherwise specified in the relevant specification, allow the DUT to recover under
standard atmospheric conditions for a minimum of one minute, as defined in IEC 61300-1. When
the torsion test is performed at other ambient temperatures, then allow the DUT to recover
under standard atmospheric conditions for a minimum of 4 h, unless otherwise specified in the
relevant specification.
6.10 Final measurements and examinations
On completion of the test, perform the final measurements, as defined in the relevant
specification. The results of the final measurement shall be within the limits established in the
relevant specification.
Remove the DUT from the mounting fixture and visually examine the evaluated DUT in
accordance with IEC 61300-3-1. Check for evidence of any degradation in the evaluated device.
Examples of failures are as follow:
• broken, loose or damaged parts or accessories;
• breaking or damage to the cable jacket, seals, strain relief, or fibres;
• displaced, bent, broken or chipped parts;
• excessive movement of seals, cable clamps or elements;
• scratching of any interface areas.
For sealing evaluation of devices such as sealed closures, the final sealing performance shall
be checked in accordance with IEC 61300-2-38, method A, with the DUT taken out of the fixture.
Free breathing closures final evaluation shall be according to the specified IP level according
to IEC 60529.

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7 Severity
The severity of the test is dependent upon the tensile load applied, the number of twists per
cycle and the twist angle for one cycle. The severity shall be specified in the relevant
specification. Recommended values of the test parameters are given in Table 1.
Table 1 – Recommended severity levels
a
Twist angle
Number of
Category Component Load
for one
cycles
cycle
 N ±°
Connectors and field mountable connectors with
2,0 180 25
primary coated and buffered fibre
Connectors and field mountable connectors with
10,0 180 25
reinforced cable
C
HD
C
Passive components and splices with primary
2,0 180 10
coated and buffered fibre
Passive components and splices with reinforced
5,0 180 10
cable
Wall outlets, boxes, optical distribution frame
C No load 90 5
modules and closures
Passive components and splices with primary
2,0 180 10
coated and buffered fibre
Passive components and splices with reinforced
5,0 180 10
OP
cable
HD
OP
Connectors and field mountable connectors with
OP+
250 μm primary coated fibre or 900 μm buffered 2,0 180 10
HD
OP+
fibre
Connectors and field mountable connectors with
10,0 180 25
reinforced cable
I
Connectors and passive components with
10,0 180 25
HD
I reinforced cable
Connectors with primary coated fibre or 900 μm
2,0 180 25
buffered fibre
Connectors with reinforced cable 15,0 180 25
E
Passive components with primary coated fibre or
2,0 180 10
900 μm buffered fibre
Passive components with reinforced cable 5,0 180 10
A
Hardened connectors, street cabinets, boxes and
G No load 90 5
closures
S
a
Twist angle value indicated is minimum, unless otherwise specified in the relevant document.
NOTE Categories are defined in IEC 61753-1.

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IEC 61300-2-5:2022 © IEC 2022 – 11 –
8 Details to be specified and reported
The following details, as applicable, are specified in the relevant specification and reported in
the test report:
• description of the DUT, for example cable diameter, d, number of fibres, etc;
• ambient test temperature;
• tensile load to be applied to the cable;
• optical performance pass/fail criteria;
• frequency of optical measurement or twisting angle at which measurements are taken;
• clamping distance L;
• twist angle;
• number of cycles;
• duration at each twist angle and time to accomplish a twist cycle;
• sealing performance measurements with pass/fail criteria;
• deviations from the test procedure described in this document;
• additional pass/fail criteria.

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