kSIST FprEN IEC 60721-3-7:2025

SLOVENSKI STANDARD
oSIST prEN IEC 60721-3-7:2025
01-marec-2025
Razvrščanje okoljskih pogojev - 3. del: Razvrščanje skupin okoljskih parametrov
in njihove resnosti - 7. odsek: Prenosna in nefiksna uporaba
Classification of environmental conditions - Part 3: Classification of groups of
environmental parameters and their severities - Section 7: Portable and non-stationary
use
Klassifizierung von Umweltbedingungen - Teil 3: Klassen von Umwelteinflußgrößen und
deren Grenzwerte - Hauptabschnitt 7: Ortsveränderlicher Einsatz
Classification des conditions d'environnement - Partie 3: Classification des groupements
des agents d'environnement et de leurs sévérités - Section 7: Utilisation en déplacement
Ta slovenski standard je istoveten z: prEN IEC 60721-3-7:2024
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
oSIST prEN IEC 60721-3-7:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 60721-3-7:2025
oSIST prEN IEC 60721-3-7:2025
104/1085/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60721-3-7 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-12-27 2025-03-21
SUPERSEDES DOCUMENTS:
104/1061A/CD, 104/1080/CC
IEC TC 104 : ENVIRONMENTAL CONDITIONS, CLASSIFICATION AND METHODS OF TEST
SECRETARIAT: SECRETARY:
Sweden Mr Joakim Grafström
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 85,TC 105,TC 119
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:
Classification of environmental conditions - Part 3: Classification of groups of environmental
parameters and their severities - Section 7: Portable and non-stationary use

PROPOSED STABILITY DATE: 2035
NOTE FROM TC/SC OFFICERS:
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oSIST prEN IEC 60721-3-7:2025
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1 CONTENTS
2 CONTENTS . 2
3 FOREWORD . 3
4 1 Scope and object . 5
5 2 Normative references. 5
6 3 Terms and definitions . 5
7 4 General . 6
8 5 Classification of groups of environmental parameters and their severities . 7
9 5.1 General . 7
10 5.2 Climatic conditions (K) . 7
11 5.3 Biological Conditions (B) . 11
12 5.4 Chemically active substances (C) . 11
13 5.5 Mechanically active substances (S) . 13
14 5.6 Mechanical conditions (M) . 14
15 Bibliography . 17
17 Figure 1 – Stationary vibration, sinusoidal . 16
18 Figure 2 – Stationary vibration, random . 16
19 Figure 3 – Non-stationary shock Conditions . 17
21 Table 1 – Classification of climatic conditions . 9
22 Table 2 – Classification of special climatic conditions . 11
23 Table 3 – Classification of biological conditions . 11
24 Table 4 – Classification of chemically active substances . 13
25 Table 5 − Classification of mechanically active substances . 14
26 Table 6 – Classification of mechanical conditions . 15
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29 INTERNATIONAL ELECTROTECHNICAL COMMISSION
30 ____________
32 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
33 Part 3-7: Classification of groups of environmental parameters and their
34 severities – Portable and non-stationary use
35 FOREWORD
36 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
37 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
38 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
39 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
40 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
41 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
42 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
43 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
44 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
45 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
46 consensus of opinion on the relevant subjects since each technical committee has representation from all
47 interested IEC National Committees.
48 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
49 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
50 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
51 misinterpretation by any end user.
52 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
53 transparently to the maximum extent possible in their national and regional publications. Any divergence between
54 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
55 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
56 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
57 services carried out by independent certification bodies.
58 6) All users should ensure that they have the latest edition of this publication.
59 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
60 members of its technical committees and IEC National Committees for any personal injury, property damage or
61 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
62 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
63 Publications.
64 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
65 indispensable for the correct application of this publication.
66 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
67 rights. IEC shall not be held responsible for identifying any or all such patent rights.
68 International Standard IEC 60721-3-7 has been prepared by IEC technical committee 104:
69 Environmental conditions, classification, and methods of test.
70 This third edition cancels and replaces the second edition, published in 1995, and constitutes
71 a technical revision.
72 This edition includes the following significant technical changes with respect to the previous
73 edition:
74 a) Most classes have been replaced by completely by new classes based on the use of new
75 information obtained from referenced Technical Reports.
76 b) Table 1 through to Table 5 have been updated.

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77 c) The content of the six informative Annex’s have either been incorporated into main body
78 text or deleted.
79 The text of this International Standard is based on the following documents:
FDIS Report on voting
80 Full information on the voting for the approval of this International Standard can be found in the
81 report on voting indicated in the above table.
82 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
83 A list of all parts in the IEC 60721 series, published under the general title Classification of
84 environmental conditions, can be found on the IEC website.
85 The committee has decided that the contents of this document will remain unchanged until the
86 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
87 the specific document. At this date, the document will be
88 • reconfirmed,
89 • withdrawn,
90 • replaced by a revised edition, or
91 • amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.
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95 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
96 Part 3-7: Classification of groups of environmental parameters
97 and their severities – Portable and non-stationary use.
98 1 Scope and object
99 This part of IEC 60721 classifies the groups of environmental parameters and their severities
100 to which products are subject to during portable and non-stationary use. This includes periods
101 of transfer, down time, maintenance and repair.
102 The environmental conditions encompassed by these groups include the environmental
103 conditions occurring:
104 • at locations where the product may be placed or used temporarily and
105 • during the transfer of products between different locations.
106 The conditions of portable and non-stationary use to which products may be exposed include
107 land-based and offshore, weatherprotected, and non-weatherprotected locations. The
108 conditions also include those occurring during transfer between locations.
109 The environmental conditions specified in this document are applicable to products which are
110 frequently moved from place to place, particularly when the transfer time may be a significant
111 proportion of the product’s lifetime. During such transfer the product is unlikely to have any
112 special packaging.
113 The environmental conditions specified in this document do not consider the use profile of the
114 product i.e., whether the product is used only during a temporary stationary state, during the
115 state of transfer or arbitrary.
116 Accidental incidents such as fire, explosion and other unforeseen incidents are not included.
117 However, their occurrence may need to be considered in special cases.
118 Micro-climates occurring within a product are not included.
119 Classification of for stationary use, storage and transportation environmental conditions are
120 given in other subparts of the IEC 60721-3 series.
121 2 Normative references
122 The following documents are referred to in the text in such a way that some or all of their content
123 constitutes requirements of this document. For dated references, only the edition cited applies.
124 For undated references, the latest edition of the referenced document (including any
125 amendments) applies.
126 IEC 60721-1, Classification of environmental conditions − Part 1: Environmental parameters
127 and their severities
128 3 Terms and definitions
129 For the purposes of this document, the terms and definitions given in IEC 60721-1 and the
130 following apply.
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131 ISO and IEC maintain terminological databases for use in standardization at the following
132 addresses:
133 • IEC Electropedia: available at http://www.electropedia.org/
134 • ISO Online browsing platform: available at http://www.iso.org/obp
135 3.1
136 portable and non-stationary use
137 not permanently mounted on any one structure or placed at a fixed site and may be operated
138 either when stationary or been transferred between locations.
139 3.2
140 weatherprotected
141 protected from the influences of meteorological conditions
142 3.3
143 non-weatherprotected
144 not protected from the influences of meteorological conditions
145 4 General
146 A product may be subjected to a range of environmental conditions during its lifetime. These
147 conditions have been separated into classes described in IEC 60721-3-0. The classes given
148 may be used for defining the maximum short-term environmental stresses on a product.
149 However, they do not provide information regarding the long-term or total lifetime environmental
150 stresses a product may experience. This means that no reliability or lifetime assessment is
151 possible based on these classes alone. Refer to the IEC 60721-2 series and applicable
152 technical reports (IEC TR 62130, IEC TR 62131-2, IEC TR 62131-3, IEC TR 62131­4 and
153 IEC TR 62131-5) for further information on actual environmental conditions.
154 A product may be simultaneously exposed to a number of environmental parameters. For
155 example, solar radiation and temperature, temperature and humidity, as well as vibration and
156 temperature change. Combinations of the environmental parameters given may increase the
157 stress effect on a product. Therefore, combined conditions should be considered in the design
158 and evaluation of a product.
159 Products should be designed to survive and operate in different environments. Basically, they
160 will be affected by environmental influences in two ways:
161 • by the effects of short-term extreme environmental conditions which may directly cause
162 malfunction or destroy the product and
163 • by the effect of long-term subjection to non-extreme environmental stresses which may
164 slowly degrade the product and finally cause malfunction or destruction of the product.
165 Short-term extreme environmental conditions may occur at any time in a product's life. A product
166 may be unaffected by an extreme condition when it is new but fail when it is subjected to the
167 same condition after being used for a long period of time due to the effect of ageing. The order
168 in which the environmental conditions are applied may affect the results of an evaluation.
169 It is important for the product specification, when referring to a certain class in the
170 IEC 60721­3 series, to define whether the product is required to be capable of operating or only
171 to survive without permanent damage when being exposed to the conditions described by the
172 class.
173 The environmental classes may be used as a basis for the selection of design and test severities
174 with respect to the consequence of failure. Information contained in the IEC 60721­3 series may

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175 be used as a means to help establish expected requirements for use, storage, transportation,
176 etc., and in the development of relevant specifications. The selected severities used for testing
177 should attempt to produce the effects of the actual environment.
178 EXAMPLE 1 A high temperature test on a heat dissipating product is designed to simulate the thermal effect of
179 subjecting a product to conditions of high air temperature, solar radiation and other possible heat sources dependent
180 on the application.
181 EXAMPLE 2 In a mechanical shock test, the product can be subjected to mechanical shocks of simple pulse shapes
182 (e.g., half-sine), while the actual conditions cannot be described by such simple pulses.
183 It is recognized that extreme or special environmental conditions may exist which require
184 consideration of severities that are not addressed by this document.
185 5 Classification of groups of environmental parameters and their severities
186 5.1 General
187 A number of classes for climatic conditions (K), special climatic conditions (Z), biological
188 conditions (B), chemically active substances (C), mechanically active substances (S), and
189 mechanical conditions (M) are specified.
190 This classification allows for a number of possible combinations of environmental conditions
191 which bear upon products during their cycle. It represents the real situation concerning
192 world-wide conditions of usage due to local influences of open-air climate, etc. For certain
193 environmental parameters, it has not yet been possible to specify quantitative severities.
194 For a given location or product, reference should be made to the total set of classes as defined
195 in 5.2 through 5.6, for example:
196 7K13/7B3/7C2/7S6/7M5
197 5.2 Climatic conditions (K)
198 NOTE The classes defined in previous versions of this document have been replaced with new classes as a result
199 of recent efforts at collecti
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