IEC 61969-3:2011

Mechanical structures for electronic equipment - Outdoor enclosures - Part 3: Environmental requirements, tests and safety aspects

IEC 61969-3:2011 specifies a set of basic environmental requirements and tests, as well as safety aspects for outdoor enclosures under conditions of non-weatherprotected locations above ground. The purpose of this standard is to define a minimum level of environmental performance in order to meet requirements of storage, transport and final installation. It is the intention to establish basic environmental performance criteria for outdoor enclosure compliance. This second edition cancels and replaces the first edition issued in 2001. It constitutes a technical revision. The main technical changes with regard to the previous edition are as follows. Table 1 and Table 6 have been extended with requirements and tests, relevant for outdoor conditions.

Structures mécaniques pour équipment électronique - Enveloppes de plein air - Partie 3: Exigences environnementales, essais et aspects de la sécurité

La CEI 61969-3:2011 spécifie un ensemble d'exigences et d'essais environnementaux de base, ainsi que les aspects de la sécurité relatifs aux enveloppes de plein air dans des situations d'exposition non protégée contre les intempéries, au niveau du sol. L'objet de la présente norme est de définir un niveau minimal de performances environnementales, afin de répondre aux exigences de stockage, de transport et d'installation finale. Il s'agit d'établir des critères de performances environnementales de base en vue de la conformité des enveloppes de plein air. Cette deuxième édition annule et remplace la première édition, parue en 2001, dont elle constitue une révision technique. Les principaux changements techniques par rapport à l'édition précédente sont les suivants: Le Tableau 1 et le Tableau 6 ont été étendus pour couvrir les exigences et les tests applicables aux conditions de plein air.

General Information

• Status: Published
• Publication Date: 16-Nov-2011
• ICS: 31.240 - Mechanical structures for electronic equipment
• Technical Committee: SC 48D - Mechanical structures for electrical and electronic equipment
• Current Stage: DELPUB - Deleted Publication
• Start Date: 08-Jun-2020
• Completion Date: 31-Aug-2017

Relations

• Revised: IEC 61969-3:2020 - Mechanical structures for electrical and electronic equipment - Outdoor enclosures - Part 3: Environmental requirements, tests and safety aspects
• Effective Date: 05-Sep-2023
• Revises: IEC 61969-3:2001 - Mechanical structures for electronic equipment - Outdoor enclosures - Part 3: Sectional specification - Climatic, mechanical tests and safety aspects for cabinets and cases
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61969-3 ®
Edition 2.0 2011-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mechanical structures for electronic equipment – Outdoor enclosures –
Part 3: Environmental requirements, tests and safety aspects

Structures mécaniques pour équipement électronique – Enveloppes de
plein air –
Partie 3: Exigences environnementales, essais et aspects de la sécurité

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IEC 61969-3 ®
Edition 2.0 2011-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mechanical structures for electronic equipment – Outdoor enclosures –
Part 3: Environmental requirements, tests and safety aspects

Structures mécaniques pour équipement électronique – Enveloppes de
plein air –
Partie 3: Exigences environnementales, essais et aspects de la sécurité

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX M
ICS 31.240 ISBN 978-2-88912-761-0

– 2 – 61969-3 © IEC:2011
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classification of environmental conditions . 7
5 Test conditions . 8
5.1 General . 8
5.2 Climatic tests . 8
5.3 Biological tests . 8
5.4 Tests of resistance against chemically active substances . 9
5.5 Tests of resistance against mechanically active substances . 9
6 Mechanical tests. 9
6.1 General . 9
6.2 Dynamic test . 10
6.3 Lifting and stiffness test . 10
7 Safety aspects . 11
7.1 General . 11
7.2 Locking devices . 11
7.3 Vandalism resistance . 11
7.4 Bullet resistance (optional) . 12
8 Seismic requirements . 12
9 Electromagnetic shielding performance . 12
10 Thermal management . 12
11 Noise emission . 12

Table 1 – Climatic conditions for environmental classes 1 and 2 . 8
Table 2 – Biological tests . 8
Table 3 – Tests of resistance against chemically active substances . 9
Table 4 – Tests of resistance against mechanically active substances . 9
Table 5 – Vibration and shock test . 10
Table 6 – Safety aspects . 11

61969-3 © IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MECHANICAL STRUCTURES FOR ELECTRONIC EQUIPMENT –
OUTDOOR ENCLOSURES –
Part 3: Environmental requirements, tests and safety aspects

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,
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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 61969-3 has been prepared by subcommittee 48D: Mechanical
structures for electronic equipment, of IEC technical committee 48: Electromechanical
components and mechanical structures for electronic equipment.
This second edition cancels and replaces the first edition issued in 2001. It constitutes a
technical revision.
The main technical changes with regard to the previous edition are as follows.
Table 1 and Table 6 have been extended with requirements and tests, relevant for outdoor
conditions.
– 4 – 61969-3 © IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
48D/483/FDIS 48D/497/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
A list of all parts of IEC 61969 series, under the general title Mechanical structures for
electronic equipment – Outdoor enclosures, can be found on the IEC website.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61969-3 © IEC:2011 – 5 –
INTRODUCTION
IEC 61969-3 Ed.2.0 provides basic environmental test requirements to be used in the
absence of local regulatory or application specific environmental test requirements. This
provides manufacturers and users of generic outdoor enclosure solutions with minimum
performance compliance criteria; thermal solutions pending on the environment an outdoor
enclosure is subjected to. Since forced air heat dissipation and acoustic noise are closely
related, noise limitations are typically defined by local regulatory limitations.
Typically, it becomes the responsibility of the outdoor enclosure vendor to provide a solution
for thermal management within the local regulatory noise limitations.

– 6 – 61969-3 © IEC:2011
MECHANICAL STRUCTURES FOR ELECTRONIC EQUIPMENT –
OUTDOOR ENCLOSURES –
Part 3: Environmental requirements, tests and safety aspects

1 Scope
This part of IEC 61969 specifies a set of basic environmental requirements and tests, as well
as safety aspects for outdoor enclosures under conditions of non-weatherprotected locations
above ground.
The purpose of this standard is to define a minimum level of environmental performance in
order to meet requirements of storage, transport and final installation. It is the intention to
establish basic environmental performance criteria for outdoor enclosure compliance.
2 Normative references
The following referenced documents are indispensable for the application 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 60068 (all parts), Environmental testing
IEC 60417, Graphical symbols for use on equipment
IEC 60529, Degrees of protection provided by enclosures (IP code)
IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical
flame test methods
IEC 60721-3-2, Classification of environmental conditions – Part 3: Classification of groups of
environmental parameters and their severities – Section 2: Transportation
IEC 60721-3-4, Classification of environmental conditions – Part 3: Classification of groups of
environmental parameters and their severities – Section 4: Stationary use at non-weather-
protected locations
IEC 60825-1, Safety of laser products – Part 1: Equipment specification and requirements
IEC 60950 (all parts), Information technology equipment – Safety
IEC 61010, Safety requirements for electrical equipment for measurement, control, and
laboratory use
IEC 61140 Protection against electric shock - Common aspects for installation and equipment
IEC 61439-5, Low-voltage switchgear and control gear assemblies – Part 5: Assemblies for
power distribution in public networks
IEC 61587-1, Mechanical structures for electronic equipment – Tests for IEC 60917 and
IEC 60297 – Part 1, Climatic, mechanical tests and safety aspects for cabinets, racks,
subracks and chassis
61969-3 © IEC:2011 – 7 –
IEC 61587-2, Mechanical structures for electronic equipment – Tests for IEC 60917 and
60297 – Part 2: Seismic tests for cabinets and racks
IEC 61587-3, Mechanical structures for electronic equipment – Tests for IEC 60917 and
IEC 60297 – Part 3: Electromagnetic shielding performance tests for cabinets, racks and
subracks
IEC 62194, Methods of evaluating the thermal performance of enclosures
IEC 62262, Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62305-4, Protection against lightning – Part 4: Electrical and electronic systems within
structures
ISO 2533, Standard atmosphere
ISO 3744, Acoustics – Determination of sound power levels and sound energy levels of noise
sources using sound pressure – Engeneering methods for an essentially free field over a
reflecting plane
ISO 3864, Graphical symbols – Safety colours and safety signs
ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc
lamps
ETSI EN 300019-2-2, Equipment Engineering (EE);Environmental conditions and
environmental tests for telecommunications equipment; Part 2-2: Specification of
environmental tests; Transportation
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
outdoor enclosure
enclosure exposed to the outdoor environment, for stationary use at non-weatherprotected
locations, for the protection of electronic equipment installed inside against outdoor
environmental conditions
3.2
non-weatherprotected location
place with direct weather influence
4 Classification of environmental conditions
The environmental conditions are derived from IEC 60721-3-4, with the focus on empty
outdoor enclosures relevant requirements.
Class 1: Non-weatherprotected location: Covers all regions with a moderate climate.
Class 2: Non-weatherprotected locations, extended: Covers all regions with severe climate.

– 8 – 61969-3 © IEC:2011
The individual outdoor enclosure product solution tested to these basic environmental test
requirements my claim compliance to either Class 1 or Class 2 or a combination of
Class1/Class2.
5 Test conditions
5.1 General
The basic test conditions shown in Table 1; Table 2; Table 3 and Table 4 reflect typical
outdoor enclosure environments to be endured.
5.2 Climatic tests
Table 1 – Climatic conditions for environmental classes 1 and 2
Environmental parameters Test severity Duration IEC method

Class 1 Class 2
a Low air temperature -45 °C -65 °C 16 h 60068-2-1; A
b High air temperature 80 °C 90 °C 16 h 60068-2-2: B
c Damp heat 30 °C, 93 % 30 °C, 93 % 96 h 60068-2-78: Cb
d Rate of change of -50 °C to + 23 °C -50 °C to + 23 °C 2 cycles 60068-2-14: Nb
temperature
1 °C/min 1 °C/min
2 2
e Solar radiation 1 120 W/m 1 120 W/m 72 h/ 40 °C 60068-2-5 Sa
f Condensation 40 °C 40 °C 96 h 60068-2-30: Db
90 % to 100 % 90 % to 100 % RH
RH
g Precipitation (rain, snow, IP 54 IP 55 - 60529
hail, dust, etc.)
h Movement of the 50 m/s 60 m/s - -
surrounding air
i Formation of ice and frost Yes Yes - -
j Ultraviolet degradation test Yes Yes - ISO 4892-2
NOTE For comparable conditions the International Standard Air, in accordance to ISO 2533 (15 °C at 1 013,
25 hPa) shall be used.
Following the test, compliance is checked by visual inspection of the internal and external
parts; no rust, cracking or other deterioration shall be detected with impact to the required
function; no ingress of water. Hinges, locks and handles for example shall be in operating
condition. The test in accordance with Table 1, item i shall prove that access to the internal
equipment is possible without causing permanent degradation of protection levels.
5.3 Biological tests
Table 2 – Biological tests
Environmental Test severity Purpose IEC method
parameters
Class 1 Class 2
a Flora: Presence of mould, Yes Yes To check the 60068-2-10
fungus, etc. material for
resistance
b Fauna: Presence of Yes, but without Yes, but with
rodents and others harmful termites termites
to the equipment
61969-3 © IEC:2011 – 9 –
Following the test, compliance is checked by visual inspection.
5.4 Tests of resistance against chemically active substances
Table 3 – Tests of resistance against chemically active substances
(Similar to IEC 60721-3-4, Class 4C2)
Environmental parameters Test severity Duration IEC method

Class 1 Class 2
Mean value Maximum value
a Salts: Sea and road salt mist Yes, at 35 °C,5 % NaCl 4 days 60068-2-11; Ka
a
3 3
b Sulphur dioxide 0,3 mg/m 1,0 mg/m

3 3 3 3
0,11 cm /m 0,37 cm /m
a
3 3
c Hydrogen sulphide 0,1 mg/m 0,5 mg/m

3 3 3 3
0,071 cm /m 0,36 cm /m
a 3 3
d Chlorine 0,1 mg/m 0,3 mg/m 10 days 60068-2-60; Ke

3 3 3
0,034 cm /m 0,1 cm /m
a
3 3
e Nitrogen oxides 0,5 mg/m 1,0 mg/m

3 3 3 3
0,26 cm /m 0,52 cm /m
a
The tests may be performed by a four component mixture of these gases. Tests of Table 3 may be combined
with tests of Table 1.
Following the test, compliance is checked by visual inspection of the outside of the used
materials or coatings. Surface corrosion of the protective enclosure is allowed. The enclosure
design shall provide protection for electromagnetic gaskets and earthing contacts where no
corrosion is permitted.
5.5 Tests of resistance against mechanically active substances
Table 4 – Tests of resistance against mechanically active substances
Environmental parameters Test severity IEC method

Classes 1 and 2
a Sand
b Dust (suspension) IP 50 60529
(see note)
c Dust (sedimentation)
NOTE No measurable dust shall have entered the enclosure (this assessment is more severe than IEC 60529).

Following the test, compliance is checked by visual inspection.
6 Mechanical tests
6.1 General
The purpose of these mechanical tests is to ensure that the outdoor enclosure will withstand
handling, storage, transport and protect installed equipment from exposure to mechanical
stress. For seismic compliance see Clause 8. Installations in public areas typically require
compliance to more severe local regulatory laws. These and any additional application

– 10 – 61969-3 © IEC:2011
specific requirements need to be observed. Should the outdoor enclosure be installed in a
public place the power input requirements may have to be in compliance with IEC 61439-5.
6.2 Dynamic test
The dynamic tests of an outdoor enclosure shall be conducted under the intended transport
condition. Since outdoor enclosure dynamic transport stress is considerably more severe than
typical handling and storage stress no further dynamic tests are required. For the purpose of
this test no transport packing material is used. The outdoor enclosure shall be mounted to the
shock/vibration table by using the intended ground/floor mounting features. For the purpose of
the dynamic test the outdoor enclosure static load shall be agreed between the vendor and
user.
The chosen severity classes are similar to IEC 60721-3-2, class 2M1.
Table 5 – Vibration and shock test

Test severity
IEC method/
Environmental parameters
ETSI EN
Class 1 Class 2
(controlled transport (limited transport
condition) condition)
a Vibration, sinusoidal 2-9 Hz/3, 5 mm 5-9 Hz/3,5 mm
3 axes, 10 cycles displacement displacement
60068-2-6: Fc
2 2
9-200 Hz/10 m/s 9-200 Hz/10 m/s
acceleration acceleration
2 2
200-500 Hz/15 m/s 200-500 Hz/15 m/s
acceleration acceleration
1)
b  Vibration, random - 5-20 Hz: 1 m /s4/Hz ETSI EN 300019-2-2
Class 2.3
20-200 Hz: -3 dB/oct
c Shock , / sine wave Peak acceleration Peak acceleration 60068-2-27: Ea
2 2
vertical axes only 100 m/s 100 m/s Shock response
No of shocks: 3 Time: 11 ms Time: 11 ms spectrum type I
d Free fall:
enclosure mass < 20 kg 0, 25 m 1, 25 m 60068-2-32: Ed
20 kg to 100 kg 0, 25 m 1, 00 m
0, 10 m 0, 25 m
> 100 kg
1)
Alternative test.
Following the test, no deformation or damage of parts that effect form, fit and function shall be
found.
6.3 Lifting and stiffness test
If lifting eyes are provided the performance test as per IEC 61587-1 shall be applied.
Following the test, no deformation or damage of parts that effect form, fit and function shall be
found.
61969-3 © IEC:2011 – 11 –
7 Safety aspects
7.1 General
General safety requirements: The outdoor enclosure shall consider adequate design
considerations to be of danger and hazard to people and prevent unauthorized access.
To protect authorized personnel (assembly, installation, test and maintenance) the outdoor
enclosure shall be free of defects such as sharp edges, burrs, etc. Compliance to IEC 60950
is required.
Regulatory safety requirements:
The outdoor enclosure shall comply with the local enforced regulatory safety requirements.
Table 6 – Safety aspects
Requirement Test specification

Earth bonding The responsibility of the vendor is
Using IEC 60950 and IEC 61439-5
to provide sufficient conductivity for equipped enclosure
between different parts of the
IEC 61010/60825
enclosure and means for the
earth bonding of equipment
IEC 61140
Lightning strike To be observed in the total “Earth IEC 62305-4
bonding” concept
Mechanical safety IK-Code according to IEC 62262 For testing IEC 60068-2-75
Vandalism Requirements shall be part of the Tests may be part of the vendor
vendor specification specification
Warning labels General warning, caution, risk of ISO 3864, B.3.1
danger
Caution, risk of life
ISO 3864, B.3.2
Caution, risk of electric shock
ISO 3864, B.3.6
Caution, hot surface
IEC 60417
Security, vandalism protection Requirements for the resistance of Tests may be part of the user
the enclosure and the locking specifications
devices against unauthorised
access
Flammability Material properties may be IEC 60695-11-10
specified by user
7.2 Locking devices
Outdoor enclosure access locking functions such as used on doors, covers, roofs, etc. are
application and/or regulatory specific. The outdoor enclosure shall have the capability to be
locked and unlocked only by authorized crafts people.
7.3 Vandalism resistance
Outdoor enclosure vandalism resistance required on any locking functions such as used with
doors, covers, roofs, etc. are application and/or regulatory specific. The outdoor enclosure
shall provide for heavy duty key locking and hinges hardware.

– 12 – 61969-3 © IEC:2011
Compliance check: The outdoor enclosure shall be resistant to unauthorized access by the
use of typical tools such as screw drivers, pliers, hammers, etc.
7.4 Bullet resistance (optional)
Outdoor enclosure bullet resistance is application and/or regulatory specific.
The outdoor enclosure shall be designed for withstanding a 12 gauge shotgun blast of
No. 7 ½ shot at a distance of 15 m without penetration of the enclosure wall by any pellets.
Test procedure:
The enclosure shall be positioned as in a typical installation and all unique vertical surfaces
shall be subjected to a blast from a 12 gauge shotgun with No. 7 ½ size shot fired at a
distance of 15 m. The load used shall be a high brass shell fired from an improved or modified
choke barrel.
Assessment following the test: The outer skin of the enclosure may be deformed but still
maintaining the protection, without any protrusions.
8 Seismic requirements
Outdoor enclosure seismic compliance is application and/or regulatory specific. If seismic
compliance is requested, tests shall be conducted in accordance with IEC 61587-2.
9 Electromagnetic shielding performance
This requirement is optional, dependent on the area where needed.
If electromagnetic shielding compliance is required, test should be conducted in accordance
with IEC 61587-3 unless otherwise specified.
10 Thermal management
For the operation of electronic equipment housed in outdoor enclosures passive and/or active
thermal management devices are used. Since the active heat management devices typically
include fans, noise emission may have to comply with local regulatory requirements.
Preferably, outdoor enclosure heat management should be based on convection air cooling
(passive). I
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