Fibre optic interconnecting devices and passive components - Conditions for testing the protection against dust and water ingress of passive optical protective housings and hardened fibre optic connectors (IP5X, IPX4, IPX5, IPX6)

IEC TS 63334:2021 which is a technical specification, defines the conditions for testing the protection against dust and water ingress of passive optical protective housings and hardened fibre optic connectors (IP5X, IPX4, IPX5, IPX6) performed according to IEC 60529. The conditions in this document supplement the test requirements specified in IEC 60529. Protective housings and hardened connectors containing electrical conductors, electrical connections, passive electrical components, active electrical equipment or electronics that transmit signals or provide power are not within the scope of this document.

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Status
Published
Publication Date
21-Nov-2021
Current Stage
PPUB - Publication issued
Completion Date
22-Nov-2021
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Technical specification
IEC TS 63334:2021 - Fibre optic interconnecting devices and passive components - Conditions for testing the protection against dust and water ingress of passive optical protective housings and hardened fibre optic connectors (IP5X, IPX4, IPX5, IPX6)
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IEC TS 63334
Edition 1.0 2021-11
TECHNICAL
SPECIFICATION
Fibre optic interconnecting devices and passive components –
Conditions for testing the protection against dust and water ingress of passive
optical protective housings and hardened fibre optic connectors (IP5X, IPX4,
IPX5, IPX6)
IEC TS 63334:2021-11(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TS 63334
Edition 1.0 2021-11
TECHNICAL
SPECIFICATION
Fibre optic interconnecting devices and passive components –
Conditions for testing the protection against dust and water ingress of passive
optical protective housings and hardened fibre optic connectors (IP5X, IPX4,
IPX5, IPX6)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.20 ISBN 978-2-8322-1053-6

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 63334:2021 © IEC 2021
CONTENTS

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

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

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

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

4 Abreviated terms ............................................................................................................. 9

5 Conditions for dust ingress testing (IP5X) of protective housings ..................................... 9

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

5.2 Preparation of test sample ...................................................................................... 9

5.3 Initial measurement .............................................................................................. 10

5.4 Conditioning .......................................................................................................... 12

5.5 Visual and final optical performance check ........................................................... 12

5.6 Requirements ....................................................................................................... 13

5.7 Details to be specified and reported ...................................................................... 13

6 Conditions for dust ingress testing (IP5X) of hardened connectors ................................ 14

6.1 General ................................................................................................................. 14

6.2 Preparation of test sample .................................................................................... 14

6.3 Initial measurement .............................................................................................. 15

6.4 Conditioning .......................................................................................................... 16

6.5 Visual and final optical performance check ........................................................... 16

6.6 Requirements ....................................................................................................... 17

6.7 Details to be specified and reported ...................................................................... 17

7 Conditions for water ingress testing (IPX4, IPX5, IPX6) of protective housings and

hardened connectors ..................................................................................................... 18

7.1 General ................................................................................................................. 18

7.2 Preparation ........................................................................................................... 18

7.3 Conditioning .......................................................................................................... 19

7.4 Final examination .................................................................................................. 19

7.5 Requirement ......................................................................................................... 20

7.6 Details to be specified and reported ...................................................................... 20

Annex A (normative) Dust ingress testing of protective housings with more than one

connection ..................................................................................................................... 21

Annex B (informative) Graphical representation of maximum allowable water ingress .......... 23

Annex C (informative) Example calculations of maximum allowable water ingress of

different DUT sizes ........................................................................................................ 24

Bibliography .......................................................................................................................... 25

Figure 1 – Example of DUT preparation ................................................................................ 10

Figure 2 – Example of reference optical performance measurement ..................................... 10

Figure 3 – Example of optical performance measurement of connection B-2-C ..................... 11

Figure 4 – Example of optical performance measurement of connection B-1-A ...................... 12

Figure 5 – Example of DUT preparation ................................................................................ 14

Figure 6 – Example of reference optical performance measurement ..................................... 15

Figure 7 – Example of optical performance measurement of plug connected to socket 2 ...... 15

Figure 8 – Example of optical performance measurement of plug connected to socket 1 ...... 16

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IEC TS 63334:2021 © IEC 2021 – 3 –

Figure 9 – Example of DUT preparation of a hardened connector ......................................... 19

Figure A.1 – Example of optical performance measurement of connection B-2-C .................. 21

Figure B.1 – Graphical representation of maximum allowable water ingress .......................... 23

Table 1 – Overview of conditions for IP ratings covered in this document ............................... 6

Table C.1 – Example calculations of maximum allowable water ingress of different

DUT sizes ............................................................................................................................. 24

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– 4 – IEC TS 63334:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
Conditions for testing the protection against dust
and water ingress of passive optical protective housings and
hardened fibre optic connectors (IP5X, IPX4, IPX5, IPX6)
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

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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 TS 63334 has been prepared by subcommittee 86B: Fibre optic interconnecting devices

and passive components, of IEC technical committee 86: Fibre optics. It is a Technical

Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
86B/4475/DTS 86B/4516A/RVDTS

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 Technical Specification is English.

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IEC TS 63334:2021 © IEC 2021 – 5 –

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.

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.
---------------------- Page: 7 ----------------------
– 6 – IEC TS 63334:2021 © IEC 2021
INTRODUCTION

This document includes conditions for testing the protection against dust and water ingress of

passive optical protective housings and hardened fibre optic connectors according to IEC 60529.

The conditions included in this document are applicable for testing the IP ratings as summarized

in Table 1.
Table 1 – Overview of conditions for IP ratings covered in this document
Passive optical protective housings and hardened fibre optic connectors
Degree of protection against dust Degree of protection against water
- IPX4 (protected against splashing water)
IP 5X (dust-protected) IPX5 (protected against water jets)
- IPX6 (protected against powerful water jets)

Suitable acceptance conditions for the degree of protection as listed in Table 1 were searched

for in IEC SC 86B and CENELEC TC 86BXA and different options were evaluated and discussed.

The acceptance conditions in this document were presented and agreed in the Autumn 2019

meeting of IEC SC 86B/WG 6. This information was handed over to WG4, where this document

was developed.

The acceptance conditions for first characteristic numeral 5 (dust ingress) according to

IEC 60529 define that the protection is satisfactory if, on inspection, talcum powder has not

accumulated together with and any other kind of dust in quantity and location that could interfere

with the correct operation of equipment or impair safety. Additionally, it is satisfactory if no dust

deposits where it could lead to tracking along the creepage distances. Dust accumulation does

usually not impair the correct operation or impair the safety of passive optical protective

housings containing optical fibre cables, fibres, connectors and passive optical components,

and of hardened fibre optic connectors. Therefore, these conditions do not support the

evaluation if the product has passed or failed. It is not necessary to ban dust ingress for passive

optical protective housings and hardened fibre optic connectors with IP5X rating (dust-

protected). Applicable acceptance conditions for IP5X are included in this document specifically

for passive optical products.

Conditions for IP1X, IP2X, IP3X and IP4X rating (against solid foreign objects) are not included

in this document because probes with a defined form and diameter are used.

The acceptance conditions for second characteristic numerals (water ingress) according to

IEC 60529 define that if any water has entered, it generally does not interfere with the correct

operation of the equipment or impair safety, not deposit on insulation parts where it could lead

to tracking along the creepage distances, not reach live parts or windings not designed to

operate when wet, not accumulate near the cable end or enter the cable if any, and not

accumulate without doing any harm to the equipment. Water ingress does usually not impair

the correct operation or impair the safety of passive optical protective housings containing

optical fibre cables, fibres, connectors and/or passive optical components, and of hardened

fibre optic connectors. Therefore, these conditions do not support the evaluation if the product

has passed or failed. It is not necessary to ban water ingress for passive optical protective

housings and hardened fibre optic connectors with IPX4, IPX5 and IPX6 rating (splashing water

or water jet). A single fixed limit (e.g. 1 %, 0,1 %) was considered as not suitable for all sizes

of protective housings and hardened connectors, because it may be too low for the

determination of the volume of water ingress for small housings (e.g. 0,1 % of 0,1 l = 0,1 ml)

but suitable for larger housings. On the other hand, a larger limit that is suitable for small

housings may allow an excessive volume of water ingress in large housings that was also not

considered as suitable (e.g. 1 % of 750 l = 7,5 l). To take small and large housings into account,

a higher percentage for housings having a small inner volume (≤ 1 l) and a lower percentage

for large volumes (above 1 l) was considered as the best solution. Applicable acceptance

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IEC TS 63334:2021 © IEC 2021 – 7 –

conditions for IPX4, IPX5 and IPX6 are included in this document specifically for passive optical

products.

Requirements against water ingress with IPX1, IPX2 and IPX3 (dripping and spraying) rating

are not specified in the performance standards for optical products. Therefore, no conditions

are included in this document for these ratings.
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– 8 – IEC TS 63334:2021 © IEC 2021
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
Conditions for testing the protection against dust
and water ingress of passive optical protective housings and
hardened fibre optic connectors (IP5X, IPX4, IPX5, IPX6)
1 Scope

This document defines the conditions for testing the protection against dust and water ingress

of passive optical protective housings and hardened fibre optic connectors (IP5X, IPX4, IPX5,

IPX6) performed according to IEC 60529.

The conditions in this document supplement the test requirements specified in IEC 60529.

Protective housings and hardened connectors containing electrical conductors, electrical

connections, passive electrical components, active electrical equipment or electronics that

transmit signals or provide power are not within the scope of 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 60529, Degrees of protection provided by enclosures (IP Code)

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 61300-3-4, 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 61753-1, Fibre optic interconnecting devices and passive components – Performance

standard – Part 1: General and guidance
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61753-1 and

IEC 60529 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
---------------------- Page: 10 ----------------------
IEC TS 63334:2021 © IEC 2021 – 9 –
4 Abreviated terms
DUT device under test
5 Conditions for dust ingress testing (IP5X) of protective housings
5.1 General

The conditions in Clause 5 are applicable for testing the protection against dust ingress with

IP5X rating (dust-protected) of passive optical protective housings according to IEC 60529. The

conditions in Clause 5 supplement the test requirements specified in IEC 60529.
5.2 Preparation of test sample

The device under test (DUT) preparation shall be done in accordance with IEC 60529, according

to the requirements in the relevant specification and with the supplement conditions in 5.2.

Within the DUT, one fibre circuit with one connection (connector plug A, adaptor 1, connector

plug B) and with a connector plug C plugged in an adaptor 2 shall be mounted in an adaptor

field of the DUT, as shown in Figure 1.

If not otherwise specified in the relevant specification, one circuit with one connection shall be

prepared as shown in Figure 1. If more than one circuit with each a connection is specified,

then Annex A shows the configuration with three circuits (and three tested connections) for

illustration purposes and describes the procedure for more than one circuit.

A connector type with an optical interface that can be efficiently cleaned should be used, for

example a LC or SC connector type. The dust cap D provided by the manufacturer of the adaptor

2 shall be mounted on the opposite side of connector plug C in adaptor 2.
---------------------- Page: 11 ----------------------
– 10 – IEC TS 63334:2021 © IEC 2021
Key
1, 2 adaptor
A, B, C connector plug
D dust cap
F cable feed through
P protection of cable end with connector plug
S protective housing
Figure 1 – Example of DUT preparation

All the fibre ends that are usually protected in cables shall exit the DUT and sealed according

to the manufacturer’s instruction of the DUT. The second end of the cables shall be prepared

for connection to optical performance measurement equipment (for example to a light source

and a power meter) and protected during conditioning with dust or guided out of the dust

chamber.

NOTE The fibre circuits and connector plugs in the DUT are arranged in the example given in Figure 1, Figure 3

and Figure 4 so that the preparation of the DUT can be easily recognised. In real products, the fibre circuits can be

arranged in a different way. The pre-installed connector plugs (A, C) are typically oriented downward whereas the

partly later installed cables and connector plugs (connected to the free port of adaptor 2) are oriented upward.

5.3 Initial measurement

A light source with a launch cord shall be connected with the power meter, as shown in Figure

2. Then the reference optical performance measurement shall be performed in accordance with

IEC 61300-3-4 and/or IEC 61300-3-6.
Key
LS light source
PM power meter
TC launch cord
Figure 2 – Example of reference optical performance measurement
---------------------- Page: 12 ----------------------
IEC TS 63334:2021 © IEC 2021 – 11 –

The second end of the cable with connector plug B shall be connected to the launch cord that

connects to the light source and the second end of the cable with connector plug C to the power

meter, as shown in Figure 3.
Key
1, 2 adaptor
3 connection
A, B, C connector plug
D dust cap
F cable feed through
LS light source
PM power meter
S protective housing
TC launch cord
Figure 3 – Example of optical performance measurement of connection B-2-C

The optical performance measurement of the connection with connector plug B, adaptor 2 and

connector plug C shall be performed in accordance with IEC 61300-3-4 and/or IEC 61300-3-6.

Connector plug B shall be disconnected and plugged into the adaptor 1, and the dust cap D put

onto the adaptor 2, as shown in Figure 4.
---------------------- Page: 13 ----------------------
– 12 – IEC TS 63334:2021 © IEC 2021
Key
1, 2 adaptor
3 connection
A, B, C connector plug
D dust cap
F cable feed through
LS light source
PM power meter
S protective housing
TC launch cord
Figure 4 – Example of optical performance measurement of connection B-1-A

The optical performance measurement of the connection with connector plug B, adaptor 1 and

connector plug A shall be performed in accordance with IEC 61300-3-4 and/or IEC 61300-3-6.

Connector plug B may be mated with connector plug A or C minimum three times as described

in 5.3 and 5.5 and, if necessary, two more times as described in 5.5. The total number of

matings of connector plug B with connector plug A or C is maximum five.
5.4 Conditioning

The DUT in the configuration as shown in Figure 1 shall be conditioned for the IP5X rating

defined in IEC 60529.
5.5 Visual and final optical performance check

After the dust conditioning, the outer surface of the DUT shall be cleaned carefully.

The cover of the DUT shall be carefully opened and the location and the accumulation of the

dust inside the DUT shall be examined according to IEC 61300-3-1.
The reference optical performance measurement shall be done as described in 5.3.

The optical performance measurement of the connection with connector plug B, adaptor 1 and

connector plug A shall be performed in accordance with IEC 61300-3-4 and/or IEC 61300-3-6,

as shown in Figure 4.
---------------------- Page: 14 ----------------------
IEC TS 63334:2021 © IEC 2021 – 13 –

The connector plug B shall be removed from the adaptor 1, the ferrule end face inspected and,

if necessary, cleaned. IEC TR 62627-01 should be consulted for recommendations on cleaning

methods for connectors.

Afterwards, the dust cap D shall be removed from adaptor 2. The ferrule end face of connector

plug C shall be inspected and if necessary cleaned. Connector plug B shall be plugged in

adaptor 2, as shown in Figure 3. The optical performance measurement of the connection with

connector plug B, adaptor 2 and connector plug C shall be performed in accordance with

IEC 61300-3-4 and/or IEC 61300-3-6. If a connection fails the requirements, then two additional

inspections, cleaning attempts and optical performance measurements may be performed. In a

cleaning attempt, one or more cleaning process steps may be included depending on the

effective cleaning method. IEC TR 62627-01 should be consulted for recommendations on

cleaning methods for connectors.
5.6 Requirements

The optical performance of the connection B-1-A shall meet the specification (e.g. attenuation

and return loss grade) and the one of the connection B-2-C shall meet the specification (e.g.

attenuation and return loss grade) after maximum 3 cleaning attempts of each ferrule end face.

The definition of the optical performance specifications should take into account that two

connections (3 and B-1-A/B-2-C) and optical cable attenuation are measured when using the

reference measurement and optical performance measurement method of the DUT as described

above.

NOTE 1 Example of a suitable attenuation specification: If a maximum attenuation of 0,3 dB is specified for

connection 3 (connection to light source) and a maximum attenuation of 0,5 dB for connection B-1-A/B-2-C

(connections within the housing), then the total attenuation specification is 0,8 dB for pass/fail evaluation.

NOTE 2 Example of the pass/fail evaluation: If the total attenuation of the connections 3 and B-2-C of 1,1 dB is

measured and the total maximum attenuation of 0,8 dB for connections 3 and B-2-C is specified, then the ferrule end

face of connector plugs B and C can be cleaned. If after the second cleaning attempt, the measured attenuation is

0,65 dB, then the DUT passes the requirement of maximum 0,8 dB.
5.7 Details to be specified and reported

The following details, as applicable, shall be specified in the relevant specification and reported

in the test report:
a) type and configuration of DUT including optical fibre and cable type;

b) allowed optical performance (e.g. attenuation and return loss grade) of connection 3 and B-

1-A/B-2-C after conditioning with dust;
c) wavelength(s);

d) detailed description of the DUT including the installed cables, cable feed throughs and

connector type;
e) number of DUTs;
f) number of circuits (connections B-1-A/B-2-C) for evaluation;
g) conditions for mounting, assembling and positioning of the DUT;
h) pre-conditioning of the DUT;
i) atmospheric conditio
...

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