SIST EN IEC 63359:2026

SLOVENSKI STANDARD
oSIST prEN IEC 63359:2025
01-januar-2025
Tekočine za elektrotehniko - Specifikacija za ponovno uporabo mešanice plinov
kot alternativa žveplovemu heksafluoridu (SF6)
Fluids for electrotechnical application: Specifications for the re-use of mixtures of gases
alternative to sf6
Ta slovenski standard je istoveten z: prEN IEC 63359:2024
ICS:
71.100.20 Industrijski plini Gases for industrial
application
oSIST prEN IEC 63359:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 63359:2025
oSIST prEN IEC 63359:2025
10/1248/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63359 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-11-01 2025-01-24
SUPERSEDES DOCUMENTS:
10/1218/CD, 10/1244/CC
IEC TC 10 : FLUIDS FOR ELECTROTECHNICAL APPLICATIONS
SECRETARIAT: SECRETARY:
Italy Mr Riccardo Maina
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 17
ASPECTS CONCERNED:
Electricity transmission and distribution,Environment
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
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AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Fluids for electrotechnical application: Specifications for the re-use of mixtures of gases alternative to SF6

PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
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
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oSIST prEN IEC 63359:2025
10/1248/CDV – 2 – IEC CDV 63359 © IEC 2024
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions and abbreviated terms . 6
4 Contaminants and their sources . 8
5 Specifications for re-use of single gases . 9
6 Specifications for re-use of gas mixtures . 9
7 Reclaiming of gases for re-use in electrical power equipment . 13
7.1 Feasibility and process . 13
7.2 Gas analysis techniques for checking the quality of the gas . 14
7.2.1 General . 14
7.2.2 On-site analysis . 14
7.2.3 Laboratory analysis . 15
Bibliography . 16

Figure 1 – Decision flow chart for recovered gas intended to be re-used or disposed . 14

Table 1 – Most common contaminants of gases . 9
Table 2 – Specifications for re-use of mixtures of C5-FK with O2 and N2 . 11
Table 3 – Specifications for re-use of mixtures of C4-FN with CO . 11
Table 4 – Specifications for re-use of mixtures of C4-FN with O2 and CO2 . 11
Table 5 – Specifications for re-use of mixtures of C4-FN with O and N . 11
2 2
Table 6 – Specifications for re-use of mixtures of CO2 and O2 . 12
Table 7 – Specifications for re-use of mixtures of CO and N . 12
2 2
Table 8 – Specifications for re-use of mixtures of CO2, O2 and N2 . 12
Table 9 – Methods for the removal of contaminants . 13
Table 10 – Laboratory analysis techniques . 15

oSIST prEN IEC 63359:2025
IEC CDV 63359 © IEC 2024 – 3 – 10/1248/CDV
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLUIDS FOR ELECTROTECHNICAL APPLICATION: SPECIFICATIONS FOR
THE RE-USE OF MIXTURES OF GASES ALTERNATIVE TO SF6

FOREWORD
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shall not be held responsible for identifying any or all such patent rights.
IEC 63359 has been prepared by IEC technical committee 10: Fluids for electrotechnical
applications.
The text of this International Standard is based on the following documents:
Draft Report on voting
10/XXXX/FDIS 10/XXXX/RVD
Full information on the voting for the approval of this International Standard 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.

oSIST prEN IEC 63359:2025
10/1248/CDV – 4 – IEC CDV 63359 © IEC 2024
This document has been drafted in accordance with the ISO/IEC Directives, Part 2,
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• reconfirmed,
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oSIST prEN IEC 63359:2025
IEC CDV 63359 © IEC 2024 – 5 – 10/1248/CDV
1 FLUIDS FOR ELECTROTECHNICAL APPLICATION: SPECIFICATIONS FOR
2 THE RE-USE OF MIXTURES OF GASES ALTERNATIVE TO SF6
4 1 Scope
5 This document provides the quality of gases alternative to SF6 (subsequently referred to as
6 gases) for their re-use in electrical power equipment after recovery and if applicable reclaiming (e.g.,
7 during maintenance, repair, overhaul or at the end-of-life). The re-use criteria consider technical and
8 environmental concerns.
9 This document covers the same gases as listed in IEC 63360. For gases not mentioned in this document
10 the electrical power equipment manufacturer and/or the gas manufacturer shall provide the information
11 indicated in this document. It is the intention of this document to include such gases in a next edition or
12 in amendments to this edition.
13 Procedures for recovering and reclaiming of used gases are described in IEC 62271-4:2022.
14 NOTE 1 Reclaiming procedures of gases can be done by either reclaiming the complete gas or by separating the
15 most valuable components from the gas.
17 Gas analysis techniques for checking the quality of the gas are described in this document.
19 It is the responsibility of the gas manufacturer and/or the electrical power equipment manufacturer to
20 provide sufficient information for safe handling of gases and to provide a risk assessment. It is the
21 responsibility of the user of the electrical power equipment to establish appropriate health and safety
22 practices and to determine the applicability of regulatory limitations prior to use.
24 NOTE 2 If not otherwise specified in this document, concentration values (e.g. %, ppmv, µl/l) of gas components or
25 contaminants are given in volume fraction at 20 °C and 100 kPa. More information on temperature and pressure
26 dependance of mole fraction and volume fraction is given in Annex C of IEC 63360:2024.
27 NOTE 3 If gases for electrical power equipment are regulated, their designation and regulation origin can be found
28 in the IEC 62474 database [1] (available at https://std.iec.ch/iec62474 [viewed 2023-07-17]).
29 NOTE 4 Information about storage, transportation and disposal of gases, gas properties, safety and first aid,
30 environmental impact, training and certification, handling equipment, by-products, and procedures to evaluate the
31 potential effects on health are covered by IEC 62271-4:2022.
32 2 Normative references
33 The following documents are referred to in the text in such a way that some or all of their content
34 constitutes requirements of this document. For dated references, only the edition cited applies.
35 For undated references, the latest edition of the referenced document (including any
36 amendments) applies.
37 IEC 60050-212:2010, International Electrotechnical Vocabulary – Part 212: Electrical
38 insulating solids, liquids and gases (available at http://www.electropedia.org)
39 IEC 60050-212:2010/AMD1:2015
40 IEC 60050-212:2010/AMD2:2015
41 IEC 60050-212:2010/AMD3:2020
42 IEC 60050-441, International Electrotechnical Vocabulary – Part 441: Switchgear, controlgear
43 and fuses (available at http://www.electropedia.org)
44 IEC 60050-441:1984/AMD1:2000

oSIST prEN IEC 63359:2025
10/1248/CDV – 6 – IEC CDV 63359 © IEC 2024
45 IEC 60050-826, International Electrotechnical Vocabulary – Part 826: Electrical installations
46 (available at http://www.electropedia.org)
47 IEC 62271-4:2022, High-voltage switchgear and controlgear – Part 4: Handling procedures for
48 gases for insulation and/or switching
49 IEC 63360:2024, Fluids for electrotechnical application: Specifications of mixtures of gases
50 alternative to SF to be used in electrical power equipement
51 IEC 60480:2019, Specifications for the re-use of sulphur hexafluoride (SF ) and its mixtures in
52 electrical equipment
53 3 Terms and definitions and abbreviated terms
54 For the purposes of this document, the terms and definitions given in IEC 60050-212,
55 IEC 60050-441 and IEC 60050-826 and the following apply.
56 ISO and IEC maintain terminological databases for use in standardization at the following
57 addresses:
58 • IEC Electropedia: available at http://www.electropedia.org/
59 • ISO Online browsing platform: available at http://www.iso.org/obp
60 3.1
61 electrical power equipment
62 any high-voltage or medium-voltage equipment containing gas for insulation and/or switching,
63 e.g. switchgear and controlgear,
...