Fibre optic interconnecting devices and passive components - Performance standard - Part 111-08: Sealed closures for category G - Ground

IEC 61752-111-08:2021 contains the minimum tests, test severities and measurement requirements which a sealed fibre optic closure need to meet in order to be categorised as meeting the IEC standard for category G - Ground, as defined in Table A.14 of IEC 61753-1:2018. Free breathing closures are not covered in this document. This first edition cancels and replaces IEC 61753-111-8 published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 61753-111-8:
a) terms and definitions updated according to IEC 61753-1:2018 and IEC 61756-1:2019;
b) test severities updated according to IEC 61753-1:2018;
c) sealing tests are done with 20 kPa overpressure;
d) pass-fail criterion of pressure loss during test added to mechanical sealing tests;
e) vibration sealing test changed to 10 Hz, 3 mm amplitude and 1 000 000 cycles;
f) reduced loads added in cable retention test for small diameter cables and tubes;
g) reduced loads for cable axial compression test for small diameter cables;
h) the duration of the cycles in torsion and bending test is added;
i) free fall test removed (is covered by the optical shock test);
j) crush resistance test of 1 000 N for 10 min is added;
k) assembly and disassembly test: duration reduced to 5 cycles;
l) resistance to solvents and contaminating fluids: added immersion in diesel with duration of 1 h and 24 h drying time and added immersion in petroleum jelly for 5 days;
m) resistance to stress cracking solvents added for 5 days;
n) duration of the change of temperature reduced to 12 cycles;
o) water immersion test at 1 m for 7 days added.

General Information

Status
Published
Publication Date
06-Apr-2021
Current Stage
PPUB - Publication issued
Completion Date
07-Apr-2021
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IEC 61753-111-08
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 111-08: Sealed closures for category G – Ground
IEC 61753-111-08:2021-04(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61753-111-08
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 111-08: Sealed closures for category G – Ground
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.20 ISBN 978-2-8322-9659-2

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 61753-111-08:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Abbreviated terms ......................................................................................................... 11

5 General requirements .................................................................................................... 11

5.1 Storage, transportation and packaging .................................................................. 11

5.2 Installation and intervention .................................................................................. 11

5.3 Marking and identification ..................................................................................... 12

5.4 Materials ............................................................................................................... 12

5.5 Closure overpressure safety ................................................................................. 13

6 Test ............................................................................................................................... 13

6.1 General ................................................................................................................. 13

6.2 Test sample preparation ....................................................................................... 13

6.3 Test and measurement methods ........................................................................... 13

6.4 Pass/fail criteria .................................................................................................... 14

6.5 Test report ............................................................................................................ 14

7 Performance requirements............................................................................................. 14

7.1 Sample size .......................................................................................................... 14

7.2 Sealing, optical and visual examination pass/fail criteria ....................................... 14

7.3 Sealing performance requirements ........................................................................ 16

7.4 Optical performance requirements ........................................................................ 19

Annex A (normative) Sample definition ................................................................................ 22

A.1 Fibre type for test sample ..................................................................................... 22

A.2 Closure optical test sample configuration .............................................................. 23

Annex B (normative) Sample size ........................................................................................ 26

Annex C (normative) Intervention and reconfiguration/resplicing .......................................... 27

C.1 Handling of the closure ......................................................................................... 27

C.2 Movements of splice trays to gain access to the actual fibre circuits ..................... 27

C.3 Addition and connection of drop cables ................................................................. 27

C.4 Rearranging splices .............................................................................................. 27

C.5 Rearranging optical connector sets, patchcords or pigtails (when applicable) ........ 28

C.6 Addition and connection of extra FMS elements .................................................... 28

C.7 Handling of the closure ......................................................................................... 28

Bibliography .......................................................................................................................... 29

Figure A.1 – Track/spur joint configuration sample ................................................................ 23

Figure A.2 – Optical circuits in track/spur joint closure .......................................................... 24

Figure A.3 – Distribution joint configuration sample............................................................... 24

Figure A.4 – Optical circuits in the distribution joint closure .................................................. 25

Table 1 – Sealing, optical and visual examination pass/fail criteria ....................................... 15

Table 2 – Sealing performance requirements ........................................................................ 16

---------------------- Page: 4 ----------------------
IEC 61753-111-08:2021 © IEC 2021 – 3 –

Table 3 – Optical performance requirements ......................................................................... 19

Table A.1 – Fibre references for IEC 60793-2-50, sub-category B-652.D .............................. 22

Table A.2 – Fibre references for IEC 60793-2-50, sub-category B-657.A1............................. 22

Table A.3 – Fibre references for IEC 60793-2-50, sub-category B-657.A2............................. 23

Table B.1 – Sample size ....................................................................................................... 26

---------------------- Page: 5 ----------------------
– 4 – IEC 61753-111-08:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 111-08: Sealed closures for category G – Ground
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,

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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

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services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

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 61753-111-08 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 first edition cancels and replaces IEC 61753-111-8 published in 2009. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to

IEC 61753-111-8:

a) terms and definitions updated according to IEC 61753-1:2018 and IEC 61756-1:2019;

b) test severities updated according to IEC 61753-1:2018;
c) sealing tests are done with 20 kPa overpressure;

d) pass-fail criterion of pressure loss during test added to mechanical sealing tests;

e) vibration sealing test changed to 10 Hz, 3 mm amplitude and 1 000 000 cycles;
---------------------- Page: 6 ----------------------
IEC 61753-111-08:2021 © IEC 2021 – 5 –

f) reduced loads added in cable retention test for small diameter cables and tubes;

g) reduced loads for cable axial compression test for small diameter cables;
h) the duration of the cycles in torsion and bending test is added;
i) free fall test removed (is covered by the optical shock test);
j) crush resistance test of 1 000 N for 10 min is added;
k) assembly and disassembly test: duration reduced to 5 cycles;

l) resistance to solvents and contaminating fluids: added immersion in diesel with duration of

1 h and 24 h drying time and added immersion in petroleum jelly for 5 days;
m) resistance to stress cracking solvents added for 5 days;
n) duration of the change of temperature reduced to 12 cycles;
o) water immersion test at 1 m for 7 days added.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86B/4426/FDIS 86B/4455/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 the 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 61753 series, published under the general title Fibre optic

interconnecting devices and passive components – Performance standard, 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.

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 61753-111-08:2021 © IEC 2021
INTRODUCTION

Performance standards for sealed closures define the requirements for standard optical

performance under a set of specified conditions. This subpart of the IEC 61753-111 series

contains a series or a set of tests and measurements with clearly stated conditions, severities

and pass/fail criteria. The set of tests is intended to be a basis to prove the product’s ability to

satisfy the requirements of a specific application, market sector or user group.

A product that has been shown to meet all the requirements of this performance standard may

be declared as complying with this performance standard. Products having the same

classification from one manufacturer that satisfy this performance standard will operate within

the boundaries set by the performance standard. There is no guarantee that products from

different manufacturers, having the same classification and which conform to the same

performance standard, will provide an equivalent level of performance when they are used

together.

Conformance with IEC environmental policy according to IEC Guide 109 and concerning the

need to reduce the impacts on the natural environment of fibre optic closures during all phases

of their life – from acquiring materials to manufacturing, distribution, use, and end-of-life

treatment (i.e. re-use, recycling – recovery and disposal) – are not part of this document, but

will be covered in the generic specification.

Conformance to a performance standard demonstrates that a product has passed a design

verification test. It is not a guarantee of lifetime assured performance or reliability. Reliability

testing is the subject of a separate test schedule, where the tests and severities selected are

such that they are truly representative of the requirements of this reliability test programme.

Consistency of manufacture should be maintained using a recognised quality assurance

programme whilst the reliability of product should be evaluated using the procedures

recommended in IEC 62005 (all parts).
---------------------- Page: 8 ----------------------
IEC 61753-111-08:2021 © IEC 2021 – 7 –
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 111-08: Sealed closures for category G – Ground
1 Scope

This part of IEC 61753 contains the minimum tests, test severities and measurement

requirements which a sealed fibre optic closure need to meet in order to be categorised as

meeting the IEC standard for category G – Ground, as defined in Table A.14 of
IEC 61753-1:2018. Free breathing closures are not covered in this document.
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 60068-2-10, Environmental testing – Part 2-10: Tests – Test J and guidance: Mould growth

IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for

class B single-mode fibres

IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 1: General and guidance

IEC 61300-2-1, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-1: Tests – Vibration (sinusoidal)

IEC 61300-2-4, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-4: Tests – Fibre or cable retention

IEC 61300-2-5, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-5: Tests – Torsion

IEC 61300-2-9, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-9: Tests – Shock

IEC 61300-2-10, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-10: Tests – Crush resistance

IEC 61300-2-11, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-11: Tests – Axial compression

IEC 61300-2-12, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-12: Tests – Impact

IEC 61300-2-22, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-22: Tests – Change of temperature
---------------------- Page: 9 ----------------------
– 8 – IEC 61753-111-08:2021 © IEC 2021

IEC 61300-2-23, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-23: Tests – Sealing for non-pressurized closures of fibre

optic devices

IEC 61300-2-26, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-26: Tests – Salt mist

IEC 61300-2-33, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-33: Tests – Assembly and disassembly of fibre optic

mechanical splices, fibre management systems and closures

IEC 61300-2-34, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-34: Tests – Resistance to solvents and contaminating fluids

of interconnecting components and closures

IEC 61300-2-37, Fibre optic interconnecting devices and passive components – Basic test and

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

IEC 61300-2-38, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 2-38: Tests – Sealing for pressurised 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 61300-3-28, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 3-28: Examinations and measurements – Transient loss

IEC 61753-1:2018, Fibre optic interconnecting devices and passive components – Performance

standard – Part 1: General and guidance

IEC 61756-1:2019, Fibre optic interconnecting devices and passive components – Interface

standard for fibre management systems – Part 1: General and guidance

ISO 4892-3, Plastics – Methods of exposure to laboratory light sources – Fluorescent UV lamps

3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
distribution joint

protective housing that allows the splicing of the fibres from a feeder cable to the fibres of

multiple smaller drop cable and that allows easy fibre access, maintenance, re-arrangement

and addition of fibre circuits or passive optical components
Note 1 to entry: Storage of uncut fibres and fibre cable elements is allowed.
---------------------- Page: 10 ----------------------
IEC 61753-111-08:2021 © IEC 2021 – 9 –

Note 2 to entry: A distribution joint is typically used in access and distribution networks.

3.2
excursion loss

change in optical attenuation during the slow variations of environmental parameters

Note 1 to entry: Excursion loss is the ± deviation from the original value of the transmitted power at the start of the

test.
3.3
fibre management system

system to control, protect and store splices, connectors, passive optical components and fibres

from incoming to outgoing cables

Note 1 to entry: A fibre management system is intended for installation within a protective housing.

Note 2 to entry: A fibre management system is often called an "organiser".
[SOURCE: IEC 61756-1:2019, 3.1.2]
3.4
intervention

gain access to modify, add, remove or repair fibre circuits, splices, connectors or other

components between the incoming and outgoing cables of an existing closure
3.5
installation

activities and handling operations to establish and install a protective housing including the

cables or by adding new circuits, splices, connectors and other components
3.6
installation conditions

circumstances that shall be fulfilled for an installation, which includes environmental conditions,

size interface between the closure and the fibre management system, optical performance,

additional/special conditions and safety requirements
3.7
multiple element
physical fibre separation level consisting of more than one single element

Note 1 to entry: This separation level has fibres from multiple cable elements on one splice tray and is also called

mass storage. It is the lowest (worst) degree of physical circuit separation.
[SOURCE: IEC 61756-1:2019, 3.1.3]
3.8
multiple ribbon

multiple element consisting of multiple optical fibres (circuits) arranged in ribbons (fibres in

parallel) which are also arranged (for example, in stacks)
[SOURCE: IEC 61756-1:2019, 3.1.5]
3.9
residual loss
change in optical power between initial and final measurements
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– 10 – IEC 61753-111-08:2021 © IEC 2021
3.10
sealed closure

watertight and dust-tight housing that can hold a varying overpressure or underpressure caused

by temperature changes or atmospheric pressure changes

Note 1 to entry: There is no exchange of air with the outside environment when exposed to temperatures over the

specified operating temperature range.

Note 2 to entry: Although sealed closures are often referred to as hermetic sealed closures, humidity can enter the

inner closure by diffusion.

[SOURCE: IEC 61753-1:2018, 3.3.5, modified – Note 2 to entry has been rephrased, and Note 3

to entry and Note 4 to entry have been deleted.]
3.11
single circuit

physical fibre separation level where the optical circuit consists of one fibre (single fibre), or

more than one fibre, providing all services for one subscriber

Note 1 to entry: This fibre separation level has the fibre(s) of only one customer on one splice tray. It is the highest

(best) degree of physical circuit separation.
[SOURCE: IEC 61756-1:2019, 3.1.7]
3.12
single element

physical fibre separation level in the cable subassembly comprising one or more optical fibres

inside a common covering for example in a tube or inside one groove of a grooved cable (slotted

core cable)
Note 1 to entry: A single element provides services to more than one subscriber.

Note 2 to entry: This fibre separation level has all fibres from a cable element (e.g. loose tube) on one splice tray.

It is an intermediate degree of physical circuit separation (between single circuit and multiple element).

[SOURCE: IEC 61756-1:2019, 3.1.9]
3.13
single ribbon
single element designed to carry all fibres of one ribbon

Note 1 to entry: Depending on the fibres deployment, a single ribbon can contain all the fibres of one circuit (single

circuit) or the fibres of more than one circuit (single element).
[SOURCE: IEC 61756-1:2019, 3.1.11]
3.14
splice tray

structure that organises and controls storage of fibre splices in an orderly manner, together with

the associated excess uncabled fibre length
Note 1 to entry: It can be a part of a fibre management system.
[SOURCE: IEC 61756-1:2019, 3.1.12]
3.15
track/spur joint

protective housing that allows the splicing of all the fibres of at least three cables

Note 1 to entry: The track/spur joint acts as a reinstatement of the cable length. It will not be re-entered except for

repair or reinstatement of damaged cables.
---------------------- Page: 12 ----------------------
IEC 61753-111-08:2021 © IEC 2021 – 11 –

Note 2 to entry: This closure configuration is typically used in trunk and junction networks to connect the cable

sections from various cable reels or to split one cable into at least two smaller cables.

3.16
transient loss

short term (ms) reversible change of optical transmission characteristics arising from optical

discontinuity, physical defects and modifications of the attenuation (e.g. bending loss) normally

caused by mechanical stress
3.17
uncut fibre

fibres from a continuous cable with the cable sheath removed over a defined length without

cutting the fibres or tubes

Note 1 to entry: The uncut tubes or fibres are stored e.g. in a space saving loop. When required, the fibres are cut

and spliced or connected.
[SOURCE: IEC 61756-1:2019, 3.1.14]
4 Abbreviated terms
FMS fibre management system
ME multiple element
MR multiple ribbons
NA not applicable
SC single circuit
SE single element
SR single ribbon
5 General requirements
5.1 Storage, transportation and packaging

The classes of environmental conditions and their severities to which sealed closures may be

exposed during transportation are defined in IEC 60721-3-2. Normal transportation time is

considered to be 30 days or less.

The product, in its original packaging, shall be suitable for normal public or commercial

transportation and storage in weather protected non-temperature controlled storage

environments and, after installation, meet the requirements as specified in Table 1, Table 2 and

Table 3.
5.2 Installation and intervention

The minimum and maximum temperatures at which a closure may be installed (installation

conditions) or re-entered (intervention) are not necessarily equal to the maximum temperature

excursion of the environment in which it will reside, once installed. Accessing fibres an

...

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