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

IEC 60721-3-1:2018 is also available as IEC 60721-3-1:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60721-3-1:2018 classifies the groups of environmental parameters and their severities to which products together with their packaging, if any, are subjected when stored. The environmental conditions specified in this document are limited to those which can directly affect the products or their ultimate performance. Only environmental conditions as such are considered. No special description of the effects of these conditions on the products is given. Environmental conditions directly related to fire or explosions are not included. Conditions of stationary use, portable and non-stationary use, use in vehicles and ships, and conditions of transportation are given in other subparts of the IEC 60721-3 series. 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.
d. 5.2: all existing climate classes have been replaced by completely new classes.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f. 5.6: all existing classes for mechanically active substances have been replaced by completely new classes.
g. 5.7: all existing classes for mechanical conditions have been replaced by completely new classes.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.

Classification des conditions d'environnement - Partie 3-1: Classification des groupements des agents d’environnement et de leurs sévérités - Stockage

IEC 60721-3-1:2018 est disponible sous forme de IEC 60721-3-1:2018 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L’IEC 60721-3-1:2018 classifie les groupements d’agents d’environnement et leurs sévérités auxquels des produits, éventuellement emballés, sont soumis lorsqu’ils sont stockés. Les conditions d’environnement spécifiées dans le présent document se limitent à celles qui sont susceptibles d’influencer directement les produits ou leur comportement ultérieur. Seules de telles conditions sont prises en considération, aucune description particulière de leurs effets sur les produits n’étant donnée. Les conditions d’environnement directement liées aux risques d’incendie ou d’explosion ne sont pas incluses. Les conditions pour une utilisation à poste fixe ou en déplacement, à bord de véhicules ou de navires, et les conditions de transport sont données dans d’autres sous-parties de la série IEC 60721-3. Cette troisième édition annule et remplace la deuxième édition, parue en 1997. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a. Article 3: reformulé et simplifié.
b. Article 4: reformulé et simplifié.
c. Article 5: l’Annexe C a été intégrée dans l’Article 5.
d. 5.2: toutes les catégories climatiques existantes ont été remplacées par des catégories complètement nouvelles. Les nouvelles catégories ont été divisées en 3 groupes. Ces catégories nouvelles ont été créées en raison de l’intégration de nouveaux types de climats dans la dernière révision de l’IEC 60721-2-1,
e. 5.3: nouvelles catégories pour le rayonnement solaire et la charge de neige.
f. 5.6: toutes les catégories existantes de substances mécaniquement actives ont été remplacées par des catégories complètement nouvelles.
g. 5.7: toutes les catégories de conditions mécaniques existantes ont été remplacées par des catégories complètement nouvelles.
h. Tableau 1: nouvelles catégories climatiques avec de nouvelles sévérités.
i. Tableau 2: nouvelles catégories pour le rayonnement solaire et la charge de neige.
j. Tableau 5: nouvelles catégories de substances mécaniquement actives.
k. Tableau 6: nouvelles catégories de conditions mécaniques.

General Information

Status
Published
Publication Date
22-Feb-2018
Current Stage
PPUB - Publication issued
Start Date
23-Feb-2018
Completion Date
23-Feb-2018
Ref Project

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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
IEC 60721-3-1:2018-02(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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
---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
IEC 60721-3-1:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
Part 3-1: Classification of groups of environmental
parameters and their severities – Storage
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

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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 60721-3-1 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.
---------------------- Page: 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 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.
---------------------- Page: 6 ----------------------
IEC 60721-3-1:2018 © IEC 2018 – 5 –
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
Part 3-1: Classification of groups of environmental
parameters and their severities – Storage
1 Scope and object

This part of IEC 60721 classifies the groups of environmental parameters and their severities

to which products together with their packaging, if any, are subjected when stored.

The environmental conditions specified in this document are limited to those which can directly

affect the products or their ultimate performance. Only environmental conditions as such are

considered. No special description of the effects of these conditions on the products is given.

Environmental conditions directly related to fire or explosions are not included.

Conditions of stationary use, portable and non-stationary use, use in vehicles and ships, and

conditions of transportation are given in other subparts of the IEC 60721-3 series.

The object of this document is to classify environmental parameters and their severities to

which a product can be exposed during storage. Transfer and handling during storage and

transport are addressed in IEC 60721-3-2.
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 60721-1, 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
3.1
enclosed location

location or structure that is covered on all sides in such a manner as to provide a degree of

protection
---------------------- Page: 7 ----------------------
– 6 – IEC 60721-3-1:2018 © IEC 2018
3.2
non-weather-protected location

location at which the product is not protected from direct meteorological conditions

3.3
open-air location

location that is unenclosed that provides no protection from meteorological conditions

3.4
storage
a product kept in a place when not being operated
3.5
sheltered location

location or structure that provides limited protection from direct meteorological conditions such

as rain and wind
3.6
weather-protected location
location at which the product is protected from 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 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 and IEC TR 62131-5) for further information on

actual environmental conditions.

A product will be simultaneously exposed to a number of 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

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 the 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 the 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 the product specification, when referring to a certain class in

IEC 60721-3 (all parts), to define whether the product is required to be capable of operating or

only to survive without permanent damage when being exposed to the conditions described by

the class.
---------------------- Page: 8 ----------------------
IEC 60721-3-1:2018 © IEC 2018 – 7 –

The environmental classes may be used as a basis for the selection of design and test

severities with respect to the consequence of failure. Information contained in

IEC 60721-3 (all parts) may be used as a means to help establish expected requirements for

use, storage, transportation, etc., and in the development of relevant specifications. The

selected severities used for testing should attempt to produce the effects of the actual

environment.

EXAMPLE 1 A high temperature test on a heat dissipating product is designed to simulate the thermal effect of

subjecting a product to conditions of high air temperature, solar radiation and other possible heat sources

dependent on the application;

EXAMPLE 2 In a mechanical shock test, the product can be subjected to mechanical shocks of simple pulse

shapes (e.g., half-sine), while the actual conditions cannot be described by such simple pulses.

It is recognized that extreme or special environmental conditions may exist which require

consideration of severities that are not addressed by this document.
5 Classification of groups of environmental parameters and their severities
5.1 General

A number of classes for climatic conditions (K), special climatic conditions (Z), biological

conditions (B), chemically active substances (C), mechanically active substances (S), and

mechanical conditions (M) are specified.

This classification allows a number of possible combinations of environmental conditions which

bear upon products wherever stored. It represents the real situation concerning worldwide

conditions of storage, for example, due to local influences of open-air climate.

For certain environmental parameters, it has not yet been possible to specify quantitative

severities.

For a given location or product, reference should be made to the total set of classes, for

example:
1K21/1Z1/1B1/1C2/1S10/1M10
5.2 Climatic conditions (K)

NOTE All old classes have been replaced with new classes. The new classes were chosen to reflect 3 different

storage condition: enclosed, sheltered and open-air locations.

The climatic conditions specified for classes 1K20 to 1K29 refer to the conditions of storage of

products. These conditions have been experienced worldwide over a long period of time taking

into account all the parameters that can influence them such as open-air climatic conditions,

type of building construction, temperature/humidity controlling systems, and internal conditions,

for example heat dissipation from other equipment and presence of humans. The conditions

should cover all normal cases, but not exceptional events.

When selecting appropriate classes, attention should be paid to the fact that the climatic

conditions inside buildings may depend on the outside (open-air) conditions, especially air

temperature and solar radiation, and the type of building construction. Walls with good thermal

insulation or high thermal capacity can consistently smooth the peaks of outside air

temperature variations between day and night, or, exceptionally, those produced over a longer

period of time. Walls with poor thermal insulation or low thermal capacity cannot have this

effect, and peaks can be magnified due to the effect of solar radiation during the day, and to

the effect of building radiation at night. The effect of solar radiation can be increased by either

heat-trap or greenhouse effects.
---------------------- Page: 9 ----------------------
– 8 – IEC 60721-3-1:2018 © IEC 2018

At non-weather-protected locations, the influence from special climatic conditions constitutes a

more significant share of the effects bearing upon a product than at weather-protected

locations. The effects of temperature change, solar radiation, precipitation, air velocity and

wind-chill should be particularly considered.

The severity of these effects may be influenced, for example by constructional details (type and

thickness of material, colour of surfaces, sealing or breathing of casings, etc.), and by storage

details (selection of storage site, consideration of degrees of exposure to prevailing wind and

weather, etc.).
Enclosed storage

1K20 applies to fully air conditioned enclosed storage locations. Air temperature and

humidity control is used continuously to maintain the required conditions.

1K21 applies to enclosed storage locations with limited temperature control and no humidity

control.

1K22 applies to enclosed storage locations having no temperature or humidity control.

Sheltered storage

1K23 applies to sheltered storage locations in tropical, arid, temperate, and cold climatic

classification with the thermal effects from solar radiation encompassed in the
temperature.

1K24 applies to sheltered storage locations in the polar climate type with the thermal effects

from solar radiation encompassed in the temperature.
Open-air storage
1K25 applies to open-air storage in the tropical climatic classification.

1K26 applies to open-air storage in the arid and temperate climatic classifications.

1K27 applies to open-air storage in the cold and polar climatic classifications.
These conditions are specified in Table 1.
---------------------- Page: 10 ----------------------
IEC 60721-3-1:2018 © IEC 2018 – 9 –
Table 1 – Classification of climatic conditions
Enclosed Sheltered Open-air
Environmental Parameter
Unit 1K20 1K21 1K22 1K23 1K24 1K25 1K26 1K27
a) Low air temperature
°C +20 +5 +5 -50
−25 −45 −50 −20
6) 11) 11) 11)
b) High air temperature
°C +25 +40 +55 +70 +70 +45 +50 +45
c) Low relative humidity
% 20 5 10 4 4 30 4 10
d) High relative humidity
% 75 85 100 100 100 100 100 100
e) Low absolute humidity
g/m 4 1 0,5 0,2 0,003 6 0,1 0,003
f) High absolute humidity
g/m 15 25 29 35 20 35 30 25
g) Rate of change of
°C/min 0,1 0,5 0,5 1,0 1,0 1,0 1,0 1,0
temperature
h) Low air pressure
kPa 70 70 70 70 70 70 70 70
i) High air pressure
kPa 106 106 106 106 106 106 106 106
j) Solar radiation
7) 7) 10) 10) 10)
W/m 1090 1090 1090
Not
No No No No
7) 7) 7) 7)
k) Heat radiation
specified
8) 8)
l) Movement of surrounding air
m/s 0,5 1,0 1,0 5,0 5,0
8) 8)
Not
No No Yes Yes Yes Yes Yes Yes
m) Condensation
specified
n) Precipitation (rain, snow,
Not 9) 9)
No No No Yes Yes Yes
Yes Yes
specified
hail, etc.)
9) 9)
o) Rain intensity
mm/min
None None None None None 15 15 15
p) Driving rain
m/s None None None None None 18 18 18
q Snow load
8) 8)
kg/m None None None None None None
9) 9)
r) Low rain temperature
°C None None None None None +5 +5 +5
s) Water from sources other
Dripping Dripping Dripping 12) 12) 12)
L/m²/min No No
Water Water Water
than rain
t) Formation of ice and frost
Not
No No Yes Yes Yes No Yes Yes
specified
(including freeze-thaw)
---------------------- Page: 11 ----------------------
– 10 – IEC 60721-3-1:2018 © IEC 2018
Notes to Table 1

1) The low and high relative humidity levels are limited by the low and high absolute humidities, so that, for

example, for environmental parameters a) and c), or b) and d), the severities given in Table 1 do not occur

simultaneously.
2) Averaged over a period of time of 5 min.

3) The value of 70 kPa represents a limit for open-air conditions, normally at an altitude of 3 000 m. In some

geographical areas, open-air conditions may occur at higher altitudes. Conditions in mines are not

considered.

4) A cooling system based on non-assisted convection may be disturbed by adverse movement of surrounding

air.

5) This rain temperature should be considered together with high air temperature b) and solar radiation j). The

cooling effect of the rain has to be considered in connection with the surface temperature of the product.

6) These are air-conditioned locations with a tolerance of ±2 °C on stated temperature value.

7) Conditions occurring at the location concerned to be selected from Table 2.
8) If applicable, a special value may be selected from Table 2.
9) Applies only to wind-driven precipitation at sheltered locations.
10) Thermal effect of solar radiation is included in the temperature.
11) Thermal effect of solar radiation is not included in the temperature.
12) Sources of water other than rain are encompassed by driving rain.
5.3 Special climatic conditions (Z)

Parameters such as heat radiation, movement of the surrounding air, solar radiation, snow

load, and water from sources other than rain may occur with any severity in combination with

any of the other climatic conditions. These conditions are specified in Table 2.
Table 2 – Classification of special climatic conditions
Environmental parameter Class Unit Special condition Z
1Z1 None Negligible
k) Heat radiation
Conditions of heat radiation, e.g. in the
1Z2 None
vicinity of room heating systems
1Z3 m/s 30
l) Movement of surrounding air
1Z4 m/s 50
s) Water from sources other than rain 1Z5 None Dripping water
1Z8 W/m 500
j) Solar radiation
1Z9 W/m 700
1Z10 kg/m 100 (single snow storm)
q) Snow load
1Z11 kg/m 240 (whole season)
5.4 Biological conditions (B)

No quantitative severity has been specified for these conditions. The specified parameters of

Table 3 are typical, but may not be complete.

1B1 applies to storage locations with environmental controls in place to prevent the growth

of mould and physical controls to prevent attack by animals.

1B2 applies to storage locations without environmental or physical controls in place to

prevent mould growth or attacks by animals
...

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