IEC 61300-2-37:2016

IEC 61300-2-37 ®
Edition 3.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 2-37: Tests – Cable bending for fibre optic closures

Dispositifs d'interconnexion et composants passifs fibroniques – Procédures
fondamentales d'essais et de mesures –
Partie 2-37: Essais – Courbure du câble pour les boîtiers pour fibres optiques

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IEC 61300-2-37 ®
Edition 3.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –
Part 2-37: Tests – Cable bending for fibre optic closures

Dispositifs d'interconnexion et composants passifs fibroniques – Procédures

fondamentales d'essais et de mesures –

Partie 2-37: Essais – Courbure du câble pour les boîtiers pour fibres optiques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-3322-1

– 2 – IEC 61300-2-37:2016 © IEC 2016
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 Terms and definitions . 5
4 General description . 6
4.1 Device under test (DUT) . 6
4.2 Test procedure . 6
5 Apparatus . 6
6 Procedure . 7
6.1 Preparation of the DUT . 7
6.2 Pre-conditioning . 7
6.3 Initial measurements . 7
6.4 Conditioning . 7
6.5 Bending procedure . 7
6.6 Recovery . 8
6.7 Final measurements . 8
7 Severity . 8
8 Details to be specified . 9
Bibliography . 10

Figure 1 – Test apparatus . 6

Table 1 – Test severities . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 2-37: Tests – Cable bending for fibre optic closures

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61300-2-37 has been prepared by sub-committee 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 2006. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) substantial updating of Subclauses 4.1, 6.5, 6.7 and Figure 1;
b) addition of severities which are determined by the number and direction of cable bends,
test temperature and overpressure for each environmental category according to
IEC 61753-1.
– 4 – IEC 61300-2-37:2016 © IEC 2016
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3975/FDIS 86B/3981/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 the parts in the 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 stability date indicated on the IEC website 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 2-37: Tests – Cable bending for fibre optic closures

1 Scope
This part of IEC 61300 describes a test for the effectiveness of the sealing and clamping
hardware of a fibre optic closure when the cable entering or exiting the fibre optic closure is
subjected to bending.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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
measurements 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 61300-3-28, 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 following terms and definitions apply.
3.1
closure
enclosure intended to provide protection to splices and joints against water and dust ingress
Note 1 to entry: Protection is provided by an overpressure/under-pressure sealing of at least 20 kPa or complete
inner filling or free-breathing method.
3.2
climatic chamber
chamber needed for conditioning the device under test
3.3
holding fixture
fixture for mounting the DUT
3.4
bending device
device for applying a controlled bending moment to the cable

– 6 – IEC 61300-2-37:2016 © IEC 2016
4 General description
4.1 Device under test (DUT)
The DUT is defined as an assembled closure with cable comprising all necessary parts for the
required function. Separate DUTs for sealing performance and optical evaluation may be used.
The sealing performance DUT shall be provided with an air pressure test access valve. The
length of the cables extending from the DUT shall be at least 1 m. The open ends of the
cables shall be sealed. Each applicable cable type with minimum and maximum cable
dimensions shall be represented in the test program. Multiple DUTs may be required to
accommodate these cables.
The optical evaluation DUT shall be constructed in such a way that it represents all allowed
functions of the product. This shall be realised by building optical circuits for each fibre
separation level. Each applicable cable type with minimum and maximum cable dimensions
shall be represented in the test program.
4.2 Test procedure
The DUT shall be securely fixed and placed in a conditioning chamber. The cable shall be
subjected to a specified number of bending cycles. A bending cycle shall consist of a bend in
one direction followed by an equal bend in the opposite direction and a return to the original
position. A force adequate to produce the specified bending shall be applied smoothly and in
a controlled manner to the cable at the specified distance from the closure outlet.
Examinations and measurements for damage of the cable, the closure, and the cable-to-
closure seal as well as hardware failure inside closure shall be made after the test.
5 Apparatus
An example of the test apparatus is given in Figure 1.
Climatic chamber
Holding fixture
Closure
30°
Cable
Front view
IEC
Figure 1 – Test apparatus
The test apparatus consists of the following elements:
– holding fixture;
– bending device;
– climatic chamber.
6 Procedure
6.1 Preparation of the DUT
At room temperature, assemble a number of closure DUTs as defined in the relevant
specification, using the smallest and largest diameter of the cable(s) for which the closure is
designed, following the manufacturer’s instructions. More DUTs than the minimum cited in the
specification may be required to accommodate all applicable cable types and sizes and fibre
separation levels. Mount the DUT to the holding fixture. Attach the cable to the device for
applying the bending moment. Unless otherwise specified, clamp the cable at 400 mm from
the end of the cable seal. For cables with outside diameter larger than 25 mm the length shall
be increased to 1 000 mm from the end of the cable seal. Connect the fibres of the device
under test to the optical circuit (if required). The number of the ports of the DUT to be used
and the configuration of the optical circuit shall be specified in the relevant specification.
6.2 Pre-conditioning
Place the device under test with the holding fixture in a climatic chamber and pre-condition it
for 4 h at the standard test conditions specified in IEC 61300-1 unless otherwise specified in
the relevant specification.
6.3 Initial measurements
Complete initial examinations and measurements on the DUT as required by the relevant
specification.
6.4 Conditioning
The following procedure shall be accomplished:
– condition the sample at the test temperature for either 4 h or as otherwise specified in the
relevant specification;
– pressurize the closure to the specified pressure, if required;
– measure the pressure according to the test method B of IEC 61300-2-38.
Conditioning of the DUT at other lower and/or higher temperatures shall be specified in the
relevant specification.
6.5 Bending procedure
Move the clamp to the specified angle. The applied bending force shall not exceed 500 N. If
no angle is specified, bending to an angle of ± 30º is recommended. When applying the bends,
change from one extreme position to another within 15 s. Maintain the cable bend for a
specified time in each direction. If duration is not specified, maintain the cable bend position
for 5 min in each direction. Apply the specified number of bending cycles. Repeat bending at
the axis perpendicular to the initially tested axis. Repeat at other axes if specified.
If required in the relevant specification, perform the transient loss measurement during the
test according to IEC 61300-3-28.
Measure the pressure according to the test method B of IEC 61300-2-38.

– 8 – IEC 61300-2-37:2016 © IEC 2016
Unless otherwise specified, repeat the test for each cable protruding from the closure.
6.6 Recovery
Allow the DUT to recover under standard test conditions for 4 h, as defined in IEC 61300-1,
unless otherwise specified in the relevant specification.
6.7 Final measurements
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 limit established in the
relevant specification.
For the sealing test of the DUT, the sealing performance shall be checked according to test
method A of IEC 61300-2-38.
For the optical evaluation of the DUT, the variation of the attenuation shall be measured
according to IEC 61300-3-28.
Visually examine the DUT in accordance with IEC 61300-3-1. Check for evidence of any
degradation in the device under test. This may include, for example:
– broken, loose or damaged parts or accessories;
– breaking or damage to the cable jacket, seals, cable clamps.
7 Severity
The severity is determined by the number and direction of cable bends, test temperature and
overpressure for each environmental category according to IEC 61753-1. The severity shall
be specified in the relevant specification. Recommended values of the test parameters are
given in Table 1.
Table 1 – Test severities
Environmental Test parameters Sealing test DUT Optical test DUT
category
Bending angle:
± 30° ± 30°
Duration
...