FprEN IEC 60721-3-5:2025

SLOVENSKI STANDARD
oSIST prEN IEC 60721-3-5:2025
01-marec-2025
Razvrščanje okoljskih pogojev - 3. del: Razvrščanje skupin okoljskih parametrov
in njihove resnosti - 5. odsek: Inštalacije v kopenskih vozilih
Classification of environmental conditions - Part 3: Classificationof groups of
environmental parameters and their severities -section 5: Ground vehicle installations
Classification des conditions d'environnement - Partie 3: Classification des groupements
des agents d'environnement et de leurs sévérités - Section 5: Installations des véhicules
terrestres
Ta slovenski standard je istoveten z: prEN IEC 60721-3-5:2024
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
oSIST prEN IEC 60721-3-5:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 60721-3-5:2025
oSIST prEN IEC 60721-3-5:2025
104/1084/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60721-3-5 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-12-27 2025-03-21
SUPERSEDES DOCUMENTS:
104/1060/CD, 104/1079/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 9,TC 44,SC 45B,TC 100,TA 6
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: Classificationof groups of environmental
parameters and their severities -Section 5: Ground vehicle installations

PROPOSED STABILITY DATE: 2035
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oSIST prEN IEC 60721-3-5:2025
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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 Special climatic conditions (Z) . 10
12 5.4 Biological (B) . 10
13 5.5 Chemically active substances (C) . 11
14 5.6 Mechanically active substances (S) . 12
15 5.7 Contaminating fluids (F) . 12
16 5.8 Mechanical conditions (M) .
17 Bibliography. 16
19 Figure 1 – Stationary vibration, sinusoidal . 15
20 Figure 2 – Stationary vibration, Random . 15
21 Figure 3 – Non-stationary shock Conditions . 16
23 Table 1 – Classification of climatic conditions . 9
24 Table 2 – Classification of special climatic conditions . 10
25 Table 3 – Classification of biological conditions . 10
26 Table 4 – Classification of chemically active substances . 10
27 Table 5 − Classification of mechanically active substances . 12
28 Table 6 − Classification of contaminating fluids . 13
29 Table 7 – Classification of mechanical conditions . 14
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32 INTERNATIONAL ELECTROTECHNICAL COMMISSION
33 ____________
35 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
37 Part 3-5: Classification of groups of environmental parameters and their
38 severities – Ground Vehicle Installations
40 FOREWORD
41 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
42 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
43 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
44 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
45 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
46 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
47 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
48 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
49 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
50 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
51 consensus of opinion on the relevant subjects since each technical committee has representation from all
52 interested IEC National Committees.
53 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
54 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
55 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
56 misinterpretation by any end user.
57 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
58 transparently to the maximum extent possible in their national and regional publications. Any divergence between
59 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
60 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
61 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
62 services carried out by independent certification bodies.
63 6) All users should ensure that they have the latest edition of this publication.
64 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
65 members of its technical committees and IEC National Committees for any personal injury, property damage or
66 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
67 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
68 Publications.
69 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
70 indispensable for the correct application of this publication.
71 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
72 rights. IEC shall not be held responsible for identifying any or all such patent rights.
73 International Standard IEC 60721-3-5 has been prepared by IEC technical committee 104:
74 Environmental conditions, classification, and methods of test.
75 This third edition cancels and replaces the second edition, published in 1997, and constitutes
76 a technical revision.
77 This edition includes the following significant changes with respect to the previous edition:
78 a) Most classes have been replaced by completely new classes based on the use of
79 additional information obtained from referenced Technical Reports.

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80 b) Table 1 through to Table 7 have been reviewed and updated.
81 c) The content of Annex A and B has either been incorporated into main body text or deleted.
82 The text of this International Standard is based on the following documents:
FDIS Report on voting
xxx xxx
84 Full information on the voting for the approval of this International Standard can be found in the
85 report on voting indicated in the above table.
86 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
87 A list of all parts in the IEC 60721 series, published under the general title Classification of
88 environmental conditions, can be found on the IEC website.
89 The committee has decided that the contents of this document will remain unchanged until the
90 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
91 the specific document. At this date, the document will be
92 • reconfirmed,
93 • withdrawn,
94 • replaced by a revised edition, or
95 • 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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98 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
99 Part 3-5: Classification of groups of environmental parameters and their
100 severities – Ground Vehicle Installations
101 1 Scope and object
102 This part of IEC 60721 classifies the groups of environmental parameters and their severities
103 to which a product. not forming part of the vehicle, is subjected when installed on or in a ground
104 vehicle. Such products are for example radios, communication systems, fare meters, flow
105 meters for liquids transported by the vehicle, for example milk, petroleum products, etc.
106 Vehicles where products may be permanently or temporarily installed include:
107 • road vehicles: passenger cars, commercial vehicles, special vehicles, towing vehicles,
108 trailers, mopeds, motorcycles,
109 • rail vehicles: trains, trams,
110 • tracked vehicles: excavators, cranes, rubber tracked vehicles,
111 • overland vehicles: four-wheel drive cars, tractors, snow scooters,
112 • handling and storage vehicles: fork-lift trucks (manual and robot), luggage transporters,
113 and
114 • self-propelled machinery: diggers, harvesters.
115 Although this document is not intended for products forming part of the vehicles, the
116 environmental condition classification may also be used for some exchangeable parts, installed
117 in a similar way and in the same locations of the vehicle as products which do not form part of
118 the vehicle. Only severe conditions which may be harmful to products are included.
119 Conditions of storage, transportation and handling are given in IEC 60721-3-1 and
120 IEC 60721-3-2. Classification of storage and transportation environmental conditions are given
121 in other subparts of the IEC 60721-3 series.
122 Accidental incidents are not included but it can be important to take their occurrence into
123 account for products vital to the safety of the ground vehicle.
124 2 Normative references
125 The following documents are referred to in the text in such a way that some or all of their content
126 constitutes requirements of this document. For dated references, only the edition cited applies.
127 For undated references, the latest edition of the referenced document (including any
128 amendments) applies.
129 IEC 60721-1, Classification of environmental conditions − Part 1: Environmental parameters
130 and their severities
131 3 Terms and definitions
132 For the purposes of this document, the terms and definitions given in IEC 60721-1 and the
133 following apply.
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134 3.1
135 internally mounted
136 mounted internally in the vehicle, in a compartment which affords some protection from the
137 environment, ranging from complete isolation from external influences, to protection only from
138 precipitation when the vehicle is not moving
139 3.2
140 externally mounted
141 mounted on the outside of the vehicle and not protected from any external influences
142 3.3
143 Weatherprotected
144 protected from the influences of meteorological conditions
145 3.4
146 non-weatherprotected
147 not protected from the influences of meteorological conditions
148 ISO and IEC maintain terminological databases for use in standardization at the following
149 addresses:
150 • IEC Electropedia: available at http://www.electropedia.org/
151 • ISO Online browsing platform: available at http://www.iso.org/obp
152 4 General
153 A product may be subjected to a range of environmental conditions during its lifetime. These
154 conditions have been separated into classes described in IEC 60721-3-0. The classes given
155 may be used for defining the maximum short-term environmental stresses on a product.
156 However, they do not provide information regarding the long-term or total lifetime environmental
157 stresses a product may experience. This means that no reliability or lifetime assessment is
158 possible based on these classes alone. Refer to the IEC 60721-2 series and applicable
159 technical reports (IEC TR 62130 as well as IEC TR 62131-3, -4 and -5) for further information
160 on actual environmental conditions.
161 A product may be simultaneously exposed to a number of environmental parameters. For
162 example, solar radiation with temperature, temperature with humidity, as well as vibration with
163 temperature change. Combinations of the environmental parameters given may increase the
164 stress effect on a product. Therefore, combined conditions should be considered in the design
165 and evaluation of a product.
166 Products should be designed to survive and operate in different environments. Basically, they
167 will be affected by environmental influences in two ways:
168 • by the effects of short-term extreme environmental conditions which may directly cause
169 malfunction or destroy the product and
170 • by the effect of long-term subjection to non-extreme environmental stresses which may
171 slowly degrade the product and finally cause malfunction or destruction of the product.
172 Short-term extreme environmental conditions may occur at any time in a product's life. A product
173 may be unaffected by an extreme condition when it is new but fail when it is subjected to the
174 same condition after being used for a long period of time due to the effect of ageing. The order
175 in which the environmental conditions are applied may affect the results of an evaluation.
176 It is important for the product specification, when referring to a certain class in the
177 IEC 60721­3 series, to define whether the product is required to be capable of operating or only
178 to survive without permanent damage when being exposed to the conditions described by the
179 class.
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180 The environmental classes can be used as a basis for the selection of design and test severities
181 with respect to the consequence of failure. Information contained in the IEC 60721­3 series can
182 be used as a means to help establish expected requirements for use, storage, transportation,
183 etc., and in the development of relevant specifications. The selected severities used for testing
184 should attempt to produce the effects of the actual environment.
185 EXAMPLE 1 A high temperature test on a heat dissipating product is designed to simulate the thermal effect of
186 subjecting a product to conditions of high air temperature, solar radiation and other possible heat sources dependent
187 on the application.
188 EXAMPLE 2 In a mechanical shock test, the product may be subjected to mechanical shocks of simple pulse shapes
189 (e.g., half-sine), while the actual conditions cannot be described by such simple pulses.
190 It is recognized that extreme or special environmental conditions can exist which require
191 consideration of severities that are not addressed by this document.
192 5 Classification of groups of environmental parameters and their severities
193 5.1 General
194 A number of classes for climatic conditions (K), special climatic conditions (Z), biological
195 conditions (B), chemically active substances (C), mechanically active substances (S), and
196 mechanical conditions (M) are specified.
197 This classification allows for a number of possible combinations of environmental conditions
198 which bear upon products wherever stored. It represents the real situation concerning
199 world-wide conditions of storage due to local influences of open-air climate, etc. For certain
200 environmental parameters, it has not yet been possible to specify quantitative severities.
201 For a given location or product, reference should be made to the total set of classes as defined
202 in 5.2 through 5.7, for example:
203 5K11/5Z2/5B1/5C3/5S5/5F1/5M5
204 5.2 Climatic conditions (K)
205 NOTE The classes defined in previous versions of this document have been replaced with new classes as a result
206 of recent efforts at collecting information regarding climatic conditions. Those results are contained in Technical
207 Reports referenced in this document.
208 When selecting appropriate classes, attention should be paid to the fact that the climatic
209 conditions inside buildings may depend on the outside (open-air) conditions, especially air
210 temperature and solar radiation, and the type of building construction. Walls with good thermal
211 insulation or high thermal capacity can consistently smooth the peaks of outside air temperature
212 variations between day and night, or, exceptionally, those produced over a longer period of
213 time. Walls with poor thermal insulation or low thermal capacity cannot have this effect and
214 peaks can be magnified due to the effect of solar radiation during the day, and to the effect of
215 building radiation at night. The effect of solar radiation can be increased by either heat-trap or
216 greenhouse effects.
217 The severity of these effects may be influenced for instance by constructional details (sort and
218 thickness of material, colour of surface, sealing or breathing of casings or enclosures, product
219 heating, etc.) and by mounting details (selection of mounting site, consideration of degree of
220 exposure to prevailing wind and weather, etc.).
221 The climatic conditions specified for classes 5K7 to 5K14 refer to the conditions in use of the
222 products. These conditions have been experienced world-wide over a long period of time taking
223 into account all the parameters that can influence them
...