prEN IEC 61300-2-58:2026

Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 2-58: Tests - Resistance test of immersion cooling environments

Lichtwellenleiter – Verbindungselemente und passive Bauteile – Grundlegende Prüf- und Messverfahren – Teil 2-58: Prüfungen – Widerstandsprüfung von Umgebungen mit Tauchkühlung

Optični spojni elementi in pasivne komponente - Osnovni preskusni in merilni postopki - 2-58. del: Preskusi - Preskus odpornosti na potopna hladilna okolja

General Information

• Status: Not Published
• Publication Date: 02-Aug-2027
• Technical Committee: CLC/TC 86BXA - Fibre optic interconnect, passive and connectorised components
• Current Stage: 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
• Start Date: 03-Apr-2026
• Completion Date: 03-Apr-2026
• Ref Project: oSIST prEN IEC 61300-2-58:2026 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 2-58: Tests - Resistance test of immersion cooling environments

Overview

prEN IEC 61300-2-58:2026 is a draft international standard developed by CLC and IEC, focusing on the resistance of fibre optic interconnecting devices and passive components when exposed to immersion cooling environments. As part of the IEC 61300 series on basic test and measurement procedures, this document provides a structured test method for evaluating the durability and performance of fibre optic connections under immersion in dielectric cooling fluids. The standard is valuable for manufacturers, integrators, and quality assurance teams that need to ensure product reliability and safety in demanding data center, telecommunication, and industrial cooling scenarios.

Key Topics

• Test Scope: The standard specifically addresses the ability of fibre optic interconnecting devices and passive components to withstand environments where immersion cooling methods are used. The evaluation targets single-phase dielectric fluids that do not boil at operating temperatures, such as those commonly found in high-performance electronic system cooling.
• Apparatus Requirements: Key equipment includes an environmental test chamber, an immersion coolant vessel made of chemically resistant material (such as borosilicate glass or stainless steel), and precise optical measurement instrumentation for monitoring device performance during testing.
• Test Procedure: The process consists of:
  • Preconditioning the device under standard laboratory conditions,
  • Visual and dimensional examination of the optical ferrule endface,
  • Submerging the device in the coolant vessel inside the environmental test chamber at a defined temperature and duration,
  • Continuous or periodic monitoring of optical attenuation and return loss,
  • Final examination and measurement after recovery.
• Performance Indicators: The focus is on identifying potential degradation in optical properties, such as increased attenuation or changes in return loss, as well as physical inspection for contaminant ingress or material damage due to the immersion environment.

Applications

• Data Centers: With the rise of liquid immersion cooling for servers and high-density hardware, verifying the resistance of fibre optic connectors and adapters against sustained coolant exposure is crucial for uninterrupted operation and long-term stability.
• Telecommunications Infrastructure: Consistent performance of fibre connections immersed in dielectric fluids is important for switches and network cabinets deployed in challenging or mission-critical environments.
• Industrial Electronics: Many industrial control and power systems leverage liquid cooling for thermal management, requiring assurance that fibre optic links maintain integrity under these conditions.
• Research and Development: Manufacturers and R&D laboratories can use the test procedures outlined in prEN IEC 61300-2-58:2026 to benchmark fibre optic component performance during product development and qualification.

Related Standards

The following standards are commonly referenced alongside prEN IEC 61300-2-58:2026:

• IEC 61300-1: General guidance for fibre optic interconnecting devices and passive components - foundational for terminology and basic procedures.
• IEC 60068-3-5: Environmental testing guidance, especially for temperature chamber performance.
• IEC 61300-3-1, 3-3, 3-4, 3-6: Specifications for visual examination, attenuation, and return loss measurements.
• IEC 61300-3-30, 3-35, 3-47: Visual inspection and geometry measurement methods for various ferrule types.
• IEC TR 62627-01: Cleaning procedures for optical connectors.

prEN IEC 61300-2-58:2026 builds on this extensive framework, providing a focused approach to evaluating fibre optic connectivity in advanced cooling environments, thereby supporting increased performance, longevity, and safety in modern fibre optic systems.

Keywords: fibre optic standards, immersion cooling resistance, IEC 61300, test procedures, optical interconnects, dielectric fluid testing, data center liquid cooling, fibre optic connector reliability.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2026
Optični spojni elementi in pasivne komponente - Osnovni preskusni in merilni
postopki - 2-58. del: Preskusi - Preskus upornosti na potopna hladilna okolja
Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 2-58: Tests - Resistance test of immersion cooling
environments
Ta slovenski standard je istoveten z: prEN IEC 61300-2-58:2026
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

86B/5153/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61300-2-58 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-01-09 2026-04-03
SUPERSEDES DOCUMENTS:
86B/5067/CD, 86B/5102A/CC
IEC SC 86B : FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS
SECRETARIAT: SECRETARY:
Japan Mr Ryo Koyama
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-58: Tests – Resistance test of immersion cooling
environments
PROPOSED STABILITY DATE: 2032
NOTE FROM TC/SC OFFICERS:
this electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee
positions. You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other
purpose without permission in writing from IEC.

IEC CDV 61300-2-58 © IEC 2026
1 CONTENTS
3 FOREWORD . 2
4 1 Scope . 4
5 2 Normative references . 4
6 3 Terms and definitions . 4
7 4 General description . 5
8 5 Apparatus . 5
9 5.1 General . 5
10 5.2 Environmental test chamber . 5
11 5.3 Immersion coolant vessel . 6
12 5.4 Optical measurement equipment . 6
13 6 Procedure . 6
14 6.1 General . 6
15 6.2 Preconditioning . 6
16 6.3 Initial examinations and measurements . 6
17 6.4 Conditioning . 6
18 6.5 Recovery . 7
19 6.6 Final examinations and measurements . 7
20 7 Severity . 7
21 8 Details to be specified and reported. 7
22 Bibliography . 9
24 Figure 1 – Example of a test setup . 6
26 Table 1 – Recommended test severity . 8
IEC CDV 61300-2-58 © IEC 2026
30 INTERNATIONAL ELECTROTECHNICAL COMMISSION
31 ____________
32 FIBRE OPTIC INTERCONNECTING
33 DEVICES AND PASSIVE COMPONENTS –
34 BASIC TEST AND MEASUREMENT PROCEDURES –
36 Part 2-58: Tests – Resistance to immersion cooling environments
38 FOREWORD
39 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
40 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
41 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
42 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
43 Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
44 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
45 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
46 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
47 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
48 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
49 consensus of opinion on the relevant subjects since each technical committee has representation from all
50 interested IEC National Committees.
51 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
52 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
53 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
54 misinterpretation by any end user.
55 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
56 transparently to the maximum extent possible in their national and regional publications. Any divergence between
57 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
58 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
59 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
60 services carried out by independent certification bodies.
61 6) All users should ensure that they have the latest edition of this publication.
62 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
63 members of its technical committees and IEC National Committees for any personal injury, property damage or
64 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
65 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
66 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
67 indispensable for the correct application of this publication.
68 9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s).
69 IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect
70 thereof. As of the date of publication of this document, IEC had received notice of (a) patent(s), which may be
71 required to implement this document. However, implementers are cautioned that this may not represent the latest
72 information, which may be obtained from the patent database available at https://patents.iec.ch. IEC shall not be
73 held responsible for identifying any or all such patent rights.
74 IEC 61300-2-58 has been prepared by subcommittee 86B: Fibre optic interconnecting devices
75 and passive components, of IEC technical committee 86: Fibre Optics. It is an International
76 Standard.
77 The text of this International Standard is based on the following documents:
Draft Report on voting
86B/XXXX/NP 86B/XXXX/RVN
79 Full information on the voting for its approval can be found in the report on voting indicated in
80 the above table.
81 The language used for the development of this International Standard is English.
IEC CDV 61300-2-58 © IEC 2026
82 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
83 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
84 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
85 described in greater detail at www.iec.ch/publications.
86 A list of all parts of IEC 61300 series, published under the general title Fibre optic
87 interconnecting devices and passive components – Basic test and measurement procedures,
88 can be found on the IEC website.
89 Future documents in this series will carry the new general title as cited above. Titles of existing
90 documents in this series will be updated at the time of the next edition. The committee has
91 decided that the contents of this document will remain unchanged until the stability date
92 indicated on the IEC website under webstore.iec.ch in the data related to the specific document.
93 At this date, the document will be
94 • reconfirmed,
95 • withdrawn, or
96 • revised.
IMPORTANT – The "colour inside" logo on the cover page of this document 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.
IEC CDV 61300-2-58 © IEC 2026
100 FIBRE OPTIC INTERCONNECTING
101 DEVICES AND PASSIVE COMPONENTS –
102 BASIC TEST AND MEASUREMENT PROCEDURES –
104 Part 2-58: Tests – Resistance to immersion cooling environments
106 1 Scope
107 This part of IEC 61300 describes a test procedure to determine the suitability of a fibre optic
108 interconnecting device to withstand immersion cooling environments. The test is intended to
109 indicate the performance of such devices w
...