SIST EN IEC 60721-3-3:2019

SLOVENSKI STANDARD
01-oktober-2019
Nadomešča:
SIST EN 60721-3-3:2001
SIST EN 60721-3-3:2001/A2:2001
Klasifikacija okoljskih pogojev - 3-3. del: Klasifikacija skupin okoljskih parametrov
in njihove resnosti - Stacionarna uporaba na lokacijah, zaščitenih pred
vremenskimi vplivi (IEC 60721-3-3:2019)
Classification of environmental conditions - Part 3-3: Classification of groups of
environmental parameters and their severities - Stationary use at weatherprotected
locations (IEC 60721-3-3:2019)
Klassifizierung von Umweltbedingungen - Teil 3-3: Klassen von Umwelteinflußgrößen
und deren Grenzwerte - Ortsfester Einsatz, wettergeschützt (IEC 60721-3-3:2019)
Classification des conditions d'environnement - Partie 3-3: Classification des
groupements des agents d'environnement et de leurs sévérités - Utilisation à poste fixe,
protégé contre les intempéries (IEC 60721-3-3:2019)
Ta slovenski standard je istoveten z: EN IEC 60721-3-3:2019
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 60721-3-3

NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2019
ICS 19.040 Supersedes EN 60721-3-3:1995 and all of its
amendments and corrigenda (if any)
English Version
Classification of environmental conditions - Part 3-3:
Classification of groups of environmental parameters and their
severities - Stationary use at weatherprotected locations
(IEC 60721-3-3:2019)
Classification des conditions d'environnement - Partie 3-3: Klassifizierung von Umgebungsbedingungen - Teil 3-3:
Classification des groupements des agents Klassen von Einflussgrößen und deren Grenzwerte –
d'environnement et de leurs sévérités - Utilisation à poste Ortsfester Einsatz, wettergeschützt
fixe, protégé contre les intempéries (IEC 60721-3-3:2019)
(IEC 60721-3-3:2019)
This European Standard was approved by CENELEC on 2019-06-26. 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,
Turkey 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
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60721-3-3:2019 E

European foreword
The text of document 104/829/FDIS, future edition 3 of IEC 60721-3-3, 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 60721-3-3:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national level by (dop) 2020-03-26
publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-06-26
document have to be withdrawn
This document supersedes EN 60721-3-3:1995 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.

Endorsement notice
The text of the International Standard IEC 60721-3-3:2019 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60068-2-27 NOTE Harmonized as EN 60068-2-27
IEC 60068-3-3 NOTE Harmonized as EN 60068-3-3
IEC 60721-2 (series) NOTE Harmonized as EN 60721-2 (series)
IEC 60721-2-1 NOTE Harmonized as EN 60721-2-1
IEC 60721-2-2 NOTE Harmonized as EN 60721-2-2
IEC 60721-2-3 NOTE Harmonized as EN 60721-2-3
IEC 60721-2-4 NOTE Harmonized as EN IEC 60721-2-4
IEC 60721-2-5 NOTE Harmonized as HD 478.2.5 S1
IEC 60721-2-6:1990 NOTE Harmonized as HD 478.2.6 S1:1993 (not modified)
IEC 60721-3 (series) NOTE Harmonized as EN 60721-3 (series)
ISO 9223 NOTE Harmonized as EN ISO 9223

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.cenelec.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 -  Classification of environmental conditions. - -
Part 3: Classification of groups of
environmental parameters and their
severities. Introduction
IEC 60721-3-3 ®
Edition 3.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Classification of environmental conditions –

Part 3-3: Classification of groups of environmental parameters

and their severities – Stationary use at weatherprotected locations

Classification des conditions d'environnement –

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

leurs sévérités – Utilisation à poste fixe, protégé contre les intempéries

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-6954-1

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CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions. 5
4 General . 6
5 Classification of groups of environmental parameters and their severities . 7
5.1 General . 7
5.2 Climatic conditions (K) . 7
5.3 Special climatic conditions (Z) . 8
5.4 Biological conditions (B) . 8
5.5 Chemically active substances (C) . 8
5.6 Mechanically active substances (S) . 8
5.7 Mechanical conditions (M) . 9
Annex A (informative) Interdependence of air temperature, relative air humidity, and
absolute air humidity . 11
Annex B (informative) Definition of seismic environment . 12
Bibliography . 14

Figure A.1 – Climatogram of interdependence of air temperature, relative air humidity,
and absolute air humidity . 11

Table 1 – Classification of climatic conditions . 9
Table 2 – Classification of special climatic conditions . 10
Table 3 – Classification of biological conditions . 10
Table 4 − Classification of mechanically active substances . 10
Table 5 − Classification of mechanical conditions . 10
Table B.1 – Correlation of seismic zones with expected magnitudes . 13

IEC 60721-3-3:2019 © IEC 2019 − 3 −
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –

Part 3-3: Classification of groups of environmental parameters
and their severities – Stationary use at weatherprotected locations

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, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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.
International Standard IEC 60721-3-3 has been prepared by IEC technical committee 104:
Environmental conditions, classification, and methods of test.
This third edition cancels and replaces the second edition published in 1994, Amendment 1:
1995 and Amendment 2:1996. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 3: definitions aligned with IEC 60721-3-1.
b) Clause 4: aligned with IEC 60721-3-1.
c) Clause 5: Clause A.3 has been incorporated into Clause 5.

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d) Subclause 5.2: all existing climate classes have been replaced by completely new classes.
The new classes are divided into two groups. The reason for the new classes is the latest
revision of IEC 60721-2-1 which incorporates new climate types.
e) Subclause 5.3: addition of a new class for low air pressure.
f) Defined values of chemically active substances are now by reference to ISO 9223.
g) Subclause 5.6: all existing classes for mechanically active substances have been replaced
by completely new classes, in alignment with IEC 60721-3-1.
h) Subclause 5.7: all existing classes for mechanical conditions have been replaced by
completely new classes, in alignment with IEC 60721-3-1.
i) Table 1: new climatic classes with new severities.
j) Table 2: new class for low air pressure.
k) Table 4: new mechanically active substances classes.
l) Table 5: new mechanical conditions classes.
m) Annex A: revised and includes a clean climatogram.
n) Annex B: revised and includes the definition of seismic environment.
o) All classes regarding fire, all combined classes, all chemically active substances classes,
Clause A.2, Annexes C, D and E have been removed.
The text of this International Standard is based on the following documents:
FDIS Report on voting
104/829/FDIS 104/837/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.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60721 series, published under the general title Classification of
environmental conditions, 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 "http://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.
IEC 60721-3-3:2019 © IEC 2019 − 5 −
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –

Part 3-3: Classification of groups of environmental parameters
and their severities – Stationary use at weatherprotected locations

1 Scope
This part of IEC 60721 classifies groups of environmental parameters and their severities to
which products are subjected when installed for stationary use at weatherprotected locations.
The environmental conditions specified in this document are limited to those which can directly
affect the performance of products. Only environmental conditions as such are considered. No
special description of the effects of these conditions on the products is provided.
Environmental conditions directly related to explosion hazards, microclimate within a product,
fire extinction and ionizing radiation are excluded. Any other unforeseen incidents are also
excluded. The possibility of their occurrence can be considered as special cases. This
document does not cover equipment covered by building standards, codes or regulations.
Conditions of stationary use at non-weatherprotected locations, portable and non-stationary
use, use in vehicles and ships, conditions of storage and transportation, and microclimates
inside products are given in other parts of the IEC 60721-3 series.
A limited number of classes of environmental conditions is given, covering a broad field of
applications.
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 60721-3-0, Classification of environmental conditions − Part 3: Classification of groups of
environmental parameters and their severities − Introduction
IEC 60721-1, Classification of environmental conditions − Part 1: Environmental parameters
and their severities
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60721-1 and the
following 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

– 6 – IEC 60721-3-3:2019 © IEC 2019
3.1
stationary use
use of a product mounted firmly on a structure, or permanently placed at a certain site
3.2
weatherprotected location
location at which a product is protected from direct exposure to meteorological conditions
4 General
A product may be subjected to a range of environmental conditions during its lifetime. These
conditions have been separated into classes described in IEC 60721-3-0. The classes given
may be used for defining the maximum short-term environmental stresses of a product.
However, they do not provide information regarding the long-term or total lifetime
environmental stresses a product may experience. This means that no
...