SIST EN IEC 60721-3-9:2024

SLOVENSKI STANDARD
01-julij-2024
Klasifikacija okoljskih pogojev - 3-9. del: Razvrščanje skupin okoljskih parametrov
in njihove resnosti - Mikroklima v izdelkih (IEC 60721-3-9:2024)
Classification of environmental conditions - Part 3-9: Classification of groups of
environmental parameters and their severities - Microclimates inside products (IEC
60721-3-9:2024)
Klassifizierung von Umgebungsbedingungen - Teil 3-9: Klassen von Einflussgrößen und
deren Grenzwerte - Mikroklimate innerhalb von Erzeugnissen (IEC 60721-3-9:2024)
Classification des conditions d'environnement - Partie 3-9: Classification des
groupements des agents d'environnement et de leurs sévérités - Microclimats à
l'intérieur des produits (IEC 60721-3-9:2024)
Ta slovenski standard je istoveten z: EN IEC 60721-3-9:2024
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60721-3-9

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2024
ICS 19.040 Supersedes EN 60721-3-9:1993;
EN 60721-3-9:1993/A1:1995
English Version
Classification of environmental conditions - Part 3-9:
Classification of groups of environmental parameters and their
severities - Microclimates inside products
(IEC 60721-3-9:2024)
Classification des conditions d'environnement - Partie 3-9: Klassifizierung von Umgebungsbedingungen - Teil 3-9:
Classification des groupements des agents Klassen von Einflussgrößen und deren Grenzwerte -
d'environnement et de leurs sévérités - Microclimats à Mikroklimate innerhalb von Erzeugnissen
l'intérieur des produits (IEC 60721-3-9:2024)
(IEC 60721-3-9:2024)
This European Standard was approved by CENELEC on 2024-05-16. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60721-3-9:2024 E

European foreword
The text of document 104/1041/FDIS, future edition 2 of IEC 60721-3-9, prepared by IEC/TC 104
"Environmental conditions, classification and methods of test" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 60721-3-9:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-02-16
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-05-16
document have to be withdrawn
This document supersedes EN 60721-3-9:1993 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60721-3-9:2024 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60721-2-1:2013 NOTE Approved as EN 60721-2-1:2014 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60721-1 - Classification of environmental conditions - EN 60721-1 -
Part 1: Environmental parameters and their
severities
IEC 60721-3-0 2020 Classification of environmental conditions - EN IEC 60721-3-0 2020
Part 3-0: Classification of groups of
environmental parameters and their
severities - Introduction
IEC 60721-3-3 2019 Classification of environmental conditions - EN IEC 60721-3-3 2019
Part 3-3: Classification of groups of
environmental parameters and their
severities - Stationary use at
weatherprotected locations
IEC 60721-3-4 2019 Classification of environmental conditions - EN IEC 60721-3-4 2019
Part 3-4: Classification of groups of
environmental parameters and their
severities - Stationary use at non-
weatherprotected locations
IEC 60721-3-9 ®
Edition 2.0 2024-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Classification of environmental conditions –

Part 3-9: Classification of groups of environmental parameters and their

severities – Microclimates inside products

Classification des conditions d'environnement –

Partie 3-9: Classification des groupements des agents d'environnement et de

leurs sévérités – Microclimats à l'intérieur des produits

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040  ISBN 978-2-8322-8626-5

– 2 – IEC 60721-3-9:2024 © IEC 2024
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General . 6
5 Classification of microclimatic conditions . 6
6 Types and marking of microclimatic classes . 7
Annex A (informative) Graphical representation and preferred microclimatic classes . 8
A.1 Graphical representation of the microclimatic classes . 8
A.2 Tables of preferred microclimatic classes . 9
Annex B (informative) Constitutional diagram for humid air . 14
B.1 General . 14
B.2 Application . 14
B.3 Description . 14
Bibliography . 17

Figure A.1 – Example of a climatogram for a microclimate: Microclimatic class
3K22/X2/Y1 . 9
Figure B.1 – Constitutional diagram for humid air . 16

Table 1 – Classification of microclimatic conditions . 7
Table A.1 – Characteristic parameters and severities of microclimatic classes –
Weatherprotected locations: Corner points A’, B’, C’, D’, E’ and F’ . 10
Table A.2 – Characteristic parameters and severities of microclimatic classes –
Weatherprotected locations: Corner points B to B and C to C . 11
Y1 Y4 Y1 Y4
Table A.3 – Characteristic parameters and severities of microclimatic classes –
Non-weatherprotected locations: Corner points A’, B’, C’, D’, E’ and F’ . 12
Table A.4 – Characteristic parameters and severities of microclimatic classes –
Non-weatherprotected locations: Corner points B to B and C to C . 13
Y1 Y4 Y1 Y4
IEC 60721-3-9:2024 © IEC 2024 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –

Part 3-9: Classification of groups of environmental parameters
and their severities – Microclimates inside products

FOREWORD
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