IEC 60721-3-1:2018

IEC 60721-3-1 ®
Edition 3.0 2018-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Classification of environmental conditions –
Part 3-1: Classification of groups of environmental parameters and their
severities – Storage
Classification des conditions d’environnement –
Partie 3-1: Classification des groupements des agents d’environnement et de
leurs sévérités – Stockage
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IEC 60721-3-1 ®
Edition 3.0 2018-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Classification of environmental conditions –

Part 3-1: Classification of groups of environmental parameters and their

severities – Storage
Classification des conditions d’environnement –

Partie 3-1: Classification des groupements des agents d’environnement et de

leurs sévérités – Stockage
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-5375-5

– 2 – IEC 60721-3-1:2018 © IEC 2018
CONTENTS
FOREWORD . 3
1 Scope and object . 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) . 10
5.4 Biological conditions (B) . 10
5.5 Chemically active substances (C) . 11
5.6 Mechanically active substances (S) . 12
5.7 Mechanical conditions (M) . 12
Annex A (informative) Chemically active substances . 13
Bibliography . 14

Table 1 – Classification of climatic conditions . 9
Table 2 – Classification of special climatic conditions . 10
Table 3 – Classification of biological conditions . 11
Table 4 – Classification of chemically active substances . 11
Table 5 – Classification of mechanically active substances . 12
Table 6 − Classification of mechanical conditions . 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –

Part 3-1: Classification of groups of environmental
parameters and their severities – Storage

FOREWORD
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International Standard IEC 60721-3-1 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 1997, and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 3: reworded and simplified.
b) Clause 4: reworded and simplified.
c) Clause 5: Annex C has been incorporated in Clause 5.

– 4 – IEC 60721-3-1:2018 © IEC 2018
d) 5.2: all existing climate classes have been replaced by completely new classes. The new
classes are divided into 3 groups. The reason for the new classes is the latest revision of
IEC 60721-2-1 which incorporated new climate types.
e) 5.3: new classes for solar radiation and snow load.
f) 5.6: all existing classes for mechanically active substances have been replaced by
completely new classes.
g) 5.7: all existing classes for mechanical conditions have been replaced by completely new
classes.
h) Table 1: new climatic classes with new severities.
i) Table 2: new classes for solar radiation and snow load.
j) Table 5 new mechanically active substances classes.
k) Table 6: new mechanical conditions classes.
The text of this International Standard is based on the following documents:
FDIS Report on voting
104/772/FDIS 104/782/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 conten
...