Classification of environmental conditions - Part 3-4: Classification of groups of environmental parameters and their severities - Stationary use at non-weatherprotected locations (IEC 60721-3-4:2019)

This part of IEC 60721 classifies groups of environmental parameters and their severities to
which products are subjected when installed for stationary use at non-weatherprotected
locations. Weatherprotected locations where products can be mounted for stationary use
permanently or temporarily are addressed in IEC 60721-3-3.
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 fire or explosion hazards, microclimate within a
product, and conditions related to effects from ionizing radiation are excluded. Any other
unforeseen incidents are also excluded.
A limited number of classes of environmental conditions is given, covering a broad field of
application.

Klassifizierung von Umweltbedingungen - Teil 3-4: Klassen von Umwelteinflußgrößen und deren Grenzwerte - Ortsfester Einsatz, nicht wettergeschützt (IEC 60721-3-4:2019)

Classification des conditions d'environnement - Partie 3-4: Classification des groupements des agents d'environnement et de leurs sévérités - Utilisation à poste fixe, non protégé contre les intempéries (IEC 60721-3-4:2019)

L’IEC 60721-3-4:2019 classifie les groupements d’agents d’environnement et leurs sévérités, auxquels sont soumis des produits montés pour une utilisation à poste fixe dans des emplacements non protégés contre les intempéries. Les emplacements protégés contre les intempéries où peuvent être montés les produits pour une utilisation fixe de manière permanente ou temporaire sont traités dans l’IEC 60721-3-3. Cette troisième édition annule et remplace la deuxième édition parue en 1995, ainsi que son amendement 1:1996. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) Article 1: reformulation. b) Article 2: mise à jour des références normatives. c) Article 3: mise à jour des définitions. d) Article 4: reformulation et simplification. e) Article 5: révision et mise à jour. Plusieurs catégories ont été remplacées par des catégories totalement nouvelles fondées sur l’utilisation de nouvelles informations obtenues dans les rapports techniques cités en référence; f) Les valeurs définies des substances chimiquement actives font désormais référence à l’ISO 9223. g) Tableaux 1 à 5: mise à jour.

Klasifikacija okoljskih pogojev - 3-4. del: Klasifikacija skupin okoljskih parametrov in njihove resnosti - Stacionarna uporaba na lokacijah, ki niso zaščitene pred vremenskimi vplivi (IEC 60721-3-4:2019)

Ta del standarda IEC 60721 razvršča skupine okoljskih parametrov in njihove resnosti, katerim so izdelki lahko izpostavljeni pri namestitvi za stacionarno uporabo na lokacijah, ki niso zaščitene pred vremenskimi vplivi. Lokacije, ki so zaščitene pred vremenskimi vplivi, kjer so izdelki nameščeni za trajno ali začasno stacionarno uporabo obravnava standard IEC 60721-3-3.
Okoljski pogoji, navedeni v tem dokumentu, so omejeni na tiste, ki lahko neposredno vplivajo na delovanje izdelkov. Obravnavani so samo okoljski pogoji, ki ustrezajo zgornjemu opisu. Na izdelkih ni podan noben poseben opis vplivov teh pogojev.
Okoljski pogoji, ki so neposredno povezani z nevarnostjo požara ali eksplozije, mikroklimo v izdelku, in pogoji, ki so povezani z učinki ionizirajočega sevanja, so izključeni. Vsakršni drugi nepredvideni dogodki so prav tako izključeni.
Navedeno je omejeno število razredov okoljskih pogojev, ki zajemajo široko področje uporabe.

General Information

Status
Published
Publication Date
19-Aug-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
25-Jul-2019
Due Date
29-Sep-2019
Completion Date
20-Aug-2019

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SLOVENSKI STANDARD
SIST EN IEC 60721-3-4:2019
01-oktober-2019
Nadomešča:
SIST EN 60721-3-4:2001
SIST EN 60721-3-4:2001/A1:2002

Klasifikacija okoljskih pogojev - 3-4. del: Klasifikacija skupin okoljskih parametrov

in njihove resnosti - Stacionarna uporaba na lokacijah, ki niso zaščitene pred
vremenskimi vplivi (IEC 60721-3-4:2019)

Classification of environmental conditions - Part 3-4: Classification of groups of

environmental parameters and their severities - Stationary use at non-weatherprotected

locations (IEC 60721-3-4:2019)

Klassifizierung von Umweltbedingungen - Teil 3-4: Klassen von Umwelteinflußgrößen

und deren Grenzwerte - Ortsfester Einsatz, nicht wettergeschützt (IEC 60721-3-4:2019)

Classification des conditions d'environnement - Partie 3-4: Classification des

groupements des agents d'environnement et de leurs sévérités - Utilisation à poste fixe,

non protégé contre les intempéries (IEC 60721-3-4:2019)
Ta slovenski standard je istoveten z: EN IEC 60721-3-4:2019
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
SIST EN IEC 60721-3-4:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 60721-3-4:2019
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SIST EN IEC 60721-3-4:2019
EUROPEAN STANDARD EN IEC 60721-3-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2019
ICS 19.040 Supersedes EN 60721-3-4:1995 and all of its
amendments and corrigenda (if any)
English Version
Classification of environmental conditions - Part 3-4:
Classification of groups of environmental parameters and their
severities - Stationary use at non-weatherprotected locations
(IEC 60721-3-4:2019)

Classification des conditions d'environnement - Partie 3-4: Klassifizierung von Umgebungsbedingungen - Teil 3-4:

Classification des groupements des agents Klassen von Einflussgrößen und deren Grenzwerte –

d'environnement et de leurs sévérités - Utilisation à poste Ortsfester Einsatz, nicht wettergeschützt

fixe, non protégé contre les intempéries (IEC 60721-3-4:2019)
(IEC 60721-3-4:2019)

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 60721-3-4:2019 E
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SIST EN IEC 60721-3-4:2019
EN IEC 60721-3-4:2019 (E)
European foreword

The text of document 104/828/FDIS, future edition 3 of IEC 60721-3-4, 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 60721-3-4:2019.
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 60721-3-4:1995 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 60721-3-4:2019 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 60721-1 NOTE Harmonized as EN 60721-1
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 60721-2-9 NOTE Harmonized as EN 60721-2-9
IEC 60721-3 (series) NOTE Harmonized as EN 60721-3-9 (series)
IEC 60721-3-0 NOTE Harmonized as EN 60721-3-0
IEC 60721-3-3 NOTE Harmonized as EN 60721-3-3
ISO 9223 NOTE Harmonized as EN ISO 9223
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SIST EN IEC 60721-3-4:2019
IEC 60721-3-4
Edition 3.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Classification of environmental conditions –
Part 3-4: Classification of groups of environmental parameters and their
severities – Stationary use at non-weatherprotected locations
Classification des conditions d'environnement –
Partie 3-4: Classification des groupements des agents d'environnement et de
leurs sévérités – Utilisation à poste fixe, non protégé contre les intempéries
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-6956-5

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60721-3-4:2019
– 2 – IEC 60721-3-4:2019 © IEC 2019
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) ...................................................................................... 8

(informative) Interdependence of air temperature, relative air humidity, and

absolute air humidity ............................................................................................................. 12

(informative) Definition of seismic environment ...................................................... 13

Bibliography .......................................................................................................................... 15

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

and absolute air humidity ...................................................................................................... 12

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 ................................................................. 11

Table B.1 – Correlation of seismic zones with expected magnitudes ..................................... 14

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SIST EN IEC 60721-3-4:2019
IEC 60721-3-4:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
Part 3-4: Classification of groups of environmental parameters and
their severities – Stationary use at non-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 60721-3-4 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 1995 and
Amendment 1:1996. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) Clause 1: reworded.
b) Clause 2: normative references have been updated.
c) Clause 3: definitions have been updated.
d) Clause 4: reworded and simplified.
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SIST EN IEC 60721-3-4:2019
– 4 – IEC 60721-3-4:2019 © IEC 2019

e) Clause 5: revised and updated. Several classes have been replaced by completely new

classes based on the use of new information obtained from referenced technical reports.

f) Defined values of chemically active substances are now by reference to ISO 9223.

g) Tables 1 through 5: updated.
The text of this International Standard is based on the following documents:
FDIS Report on voting
104/828/FDIS 104/836/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.
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SIST EN IEC 60721-3-4:2019
IEC 60721-3-4:2019 © IEC 2019 – 5 –
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
Part 3-4: Classification of groups of environmental parameters and
their severities – Stationary use at non-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 non-weatherprotected

locations. Weatherprotected locations where products can be mounted for stationary use

permanently or temporarily are addressed in IEC 60721-3-3.

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 fire or explosion hazards, microclimate within a

product, and conditions related to effects from ionizing radiation are excluded. Any other

unforeseen incidents are also excluded.

A limited number of classes of environmental conditions is given, covering a broad field of

application.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
3.1
stationary use

use of a product mounted firmly on a structure, or permanently placed at a certain site

3.2
non-weatherprotected location
location at which a product is not protected from meteorological conditions
3.3
sheltered location

location at which a product is covered by a structure to protect it from direct meteorological

conditions, i.e. direct sunlight, heavy rain
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SIST EN IEC 60721-3-4:2019
– 6 – IEC 60721-3-4:2019 © IEC 2019
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 (all parts). The classes

given may be used for defining the maximum short-term environmental stresses on 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 reliability or lifetime

assessment is possible based on these classes alone. Refer to IEC 60721-2 (all parts) and

applicable technical reports (IEC TR 62130, IEC TR 62131-2, IEC TR 62131-3,

IEC TR 62131-4 and IEC TR 62131-5) for further information on actual environmental

conditions.

A product may be simultaneously exposed to several environmental parameters, for example,

solar radiation and temperature, temperature and humidity, as well as vibration and

temperature change. Combinations of the environmental parameters given may increase the

stress effect on a product. Therefore, combined conditions should be considered in the design

and evaluation of a product.

Products should be designed to survive and operate in different environments. Basically, they

will be affected by environmental influences in two ways:

– by the effects of short-term extreme environmental conditions which may directly cause

malfunction or destroy the product;

– by the effect of long-term subjection to non-extreme environmental stresses which may

slowly degrade the product and finally cause malfunction or destruction of the product.

Short-term extreme environmental conditions may occur at any time in a product's life. A

product may be unaffected by an extreme condition when it is new but fail when it is subjected

to the same condition after being used for a long period of time due to the effect of ageing.

The order in which the environmental conditions are applied may affect the results of an

evaluation.
It is important for
...

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