IEC 61300-2-5:2009

IEC 61300-2-5 ®
Edition 3.0 2009-01
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 à fibres optiques –
Méthodes fondamentales d’essais et de mesures –
Partie 2-5: Essais – Torsion
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IEC 61300-2-5 ®
Edition 3.0 2009-01
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 à fibres optiques –

Méthodes fondamentales d’essais et de mesures –

Partie 2-5: Essais – Torsion
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-8772-9

– 2 – IEC 61300-2-5:2009  IEC 2009
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 General description . 5
4 Apparatus . 5
4.1 General . 5
4.2 Mounting fixture . 6
4.3 Cable clamp . 6
4.4 Weights . 6
4.5 Optical source and detector . 7
5 Procedure . 7
5.1 Preparation of specimens . 7
5.2 Pre-conditioning . 7
5.3 Mount the device under test . 7
5.4 Measure the attenuation . 7
5.5 Apply cable load . 7
5.6 Measure the attenuation . 7
5.7 Twist the cable . 7
5.8 Test pressure . 7
5.9 Monitoring attenuation . 8
5.10 Final measurements and examinations . 8
6 Severity . 8
7 Details to be specified . 9

Figure 1 – Component or device test set-up . 6
Figure 2 – Closure test set-up . 6

Table 1 – Severity levels . 8

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
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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 61300-2-5 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition, published in 2002 and constitutes
a technical revision. Specific technical changes from the previous edition are as follows:
– the title was changed;
– the procedure was reconsidered;
– the figure of closure test set-up was added;
– the severity of the test was reconsidered according to the component.

– 4 – IEC 61300-2-5:2009  IEC 2009
The text of this standard is based on the following documents:
FDIS Report on voting
86B/2774/FDIS 86B/2806/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 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 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.
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 to withstand torsional loads, while under tension, as might be
experienced during installation and normal service. The scope of the test also includes those
elements designed for ribbon cables.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General guidance
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
3 General description
The cable-to-device interface, while under a specified tension, is subjected to a torsional load
or twisting action to determine the effects of this action on the physical and optical properties
of the device.
4 Apparatus
4.1 General
The test apparatus shall be capable of applying simultaneously both tension and a torsional
load or twisting action to the cable-to-device interface. Figures 1 and 2 show the basic parts
of a test apparatus for component and closure test set-ups, respectively.

– 6 – IEC 61300-2-5:2009  IEC 2009
4.2 Mounting fixture
Use a fixture to rigidly mount the device under test and hold it in proper alignment throughout
the test. The fixture shall allow the device under test to be connected to an optical source and
detector for monitoring attenuation.
4.3 Cable clamp
The cable clamp is the point at which the torsional load is applied. The cable clamp shall be
capable of grasping and securing the cable so that it does not turn or slip in the holder when
loads are applied. The clamp shall not crush the optical fibres or cause a change in the
attenuation. The cable clamp may consist of a mandrel around which several turns of cable
are wrapped and secured.
4.4 Weights
Weights or another mechanism for applying a tensile load to the cable clamp are required.
Values of recommended loads are given in Table 1.

To optical source
Device
Mounting fixture (secure
under test
to prevent movement)
Weights, if specified
400 mm-1 000 mm
(See 5.3)
Cable clamp
(should facilitate
addition of weights To optical detector
if specified)
Twist in both directions
IEC  2300/08
Figure 1 – Component or device test set-up

Closure
Clamping distance
Cable
3 1
Cable seal
Sample fixation
IEC  2301/08
Figure 2 – Closure test set-up

4.5 Optical source and detector
The optical source and detector used to measure changes in attenuation shall comply with
that specified in IEC 61300-3-4.
5 Procedure
5.1 Preparation of specimens
Prepare the specimens according to the manufacturer’s instructions or as specified in the
relevant specification. The device under test shall be terminated onto a sufficient length of
fibre cable to facilitate interfacing with the optical source and detector.
5.2 Pre-conditioning
Pre-condition the device under test for 2 h at the standard test conditions specified in
IEC 61300-1, unless otherwise specified in the relevant specification. Measure and record the
attenuation of the device under test.
5.3 Mount the device under test
The body of the specimen shall be rigidly mounted to a holding plate which is secured in a
fixed position (see Figure 1). The clamp to which the load can be applied shall be fastened to
the cable in such a manner that the optical fibre or cable is not crushed. The top of the cable
clamp shall be 400 mm from the end of the strain relief, if used (see Figure 1). For cable
diameters larger than 25 mm, the top of the cable clamp shall be 1 000 mm from the end of
the strain relief. If there is no strain relief, the end of the specimen nearest the cable clamp
shall be the reference.
5.4 Measure the attenuation
Re-measure the attenuation to ensure that the fixturing and cable clamping have not affected
the cable's attenuation.
5.5 Apply cable load
Gradually apply the tensile load, as recommended in Table 1 or as specified in the relevant
specification, to the cable clamping fixture, being careful to avoid any sudden jerking or
straining of the cable.
5.6 Measure the attenuation
After the load is applied, re-measure the attenuation of the specimen. This value shall be
recorded and used as a reference to determine the effects of the twisting motion.
5.7 Twist the cable
Apply a twisting motion to the cable-clamping device, 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 indicatead in Table 1 or in the relevant specification) in the opposite direction
and a final return to the original position. Repeat the twist cycle as many times as specified in
Table 1, or in the relevant specification.
5.8 Test pressure
For Category S closures, use a test pressure: 40 kPa ± 2 kPa over-pressure at test
temperature. For products used in pressurized networks, all testing should be carried out at
98,0 kPa ± 9,8 kPa over-pressure instead of 40 kPa over-pressure.

– 8 – IEC 61300-2-5:2009  IEC 2009
5.9 Monitoring attenuation
The attenuation of the specimen shall be monitored during the test, as described in
IEC 61300-3-3, unless otherwise specified in the relevant specification. Any deviation in the
device attenuation from that measured in IEC 61300-3-6 shall be considered attributable to
the cable/device interface, fibre-to-fibre interfaces or fibre-to-source/detector interfaces in the
device.
NOTE If there are unacceptable changes in attenuation and it is questionable whether the cable itself may be at
fault, a control test to determine cable contribution shall be performed in the same manner using a piece of cable
and two cable clamps.
5.10 Final measurements and examinations
After completion of the cable twist cycling, remove all fixtures and make a final attenuation
measurement to ensure that there is no permanent damage to the device under test. The
results of the final measurement shall be within the limit established in the relevant
specification.
Remove the device from the mounting fixture and, unless otherwise specified, visually
examine the specimens in accordance with IEC 61300-3-1. Check for evidence of any
degradation in the specimen. Th
...