IEC 62208:2023
(Main)Empty enclosures for low-voltage switchgear and controlgear assemblies - General requirements
Empty enclosures for low-voltage switchgear and controlgear assemblies - General requirements
IEC 62208:2023 applies to empty enclosures, as provided by the enclosure manufacturer, prior to the incorporation of switchgear and controlgear components by the assembly manufacturer. This document specifies general definitions, classifications, characteristics and test requirements of enclosures to be used as part of switchgear and controlgear assemblies (e.g. in accordance with the product standard in the IEC 61439 series), the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC, and suitable for general use for either indoor or outdoor applications. This third edition cancels and replaces the second edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) consideration of the modifications introduced in IEC 61439-1:2020;
b) alignment of test procedures with the newest relevant standards.
Enveloppes vides destinées aux ensembles d'appareillages à basse tension - Exigences générales
L'IEC 62208:2023 s'applique aux enveloppes vides, dans l'état dans lequel elles sont fournies par le fabricant d'enveloppes, avant incorporation des composants d'appareillage par le fabricant de l'ensemble. Le présent document spécifie les définitions, les classifications, les caractéristiques et les exigences d'essai générales des enveloppes à utiliser en tant que partie d'ensembles d'appareillage (selon par exemple la norme de produit de la série IEC 61439), dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu pour usage général extérieur ou intérieur. Cette troisième édition annule et remplace la deuxième édition parue en 2011. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) prise en compte des modifications introduites dans l'IEC 61439-1:2020;
b) alignement des procédures d'essai sur les toutes nouvelles normes applicables.
General Information
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Standards Content (Sample)
IEC 62208 ®
Edition 3.0 2023-06
COMMENTED VERSION
INTERNATIONAL
STANDARD
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Empty enclosures for low-voltage switchgear and controlgear assemblies –
General requirements
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IEC 62208 ®
Edition 3.0 2023-06
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Empty enclosures for low-voltage switchgear and controlgear assemblies –
General requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-7110-0
– 2 – IEC 62208:2023 CMV © IEC 2023
CONTENTS
FOREWORD .4
INTRODUCTION .6
1 Scope .7
2 Normative references .7
3 Terms and definitions .8
4 Classification . 10
5 Electromagnetic compatibility (EMC requirements) . 11
6 Information to be given regarding the enclosure . 11
6.1 General . 11
6.2 Marking . 11
6.3 Documentation . 12
6.3.1 General . 12
6.3.2 Dimensions . 12
6.3.3 Mounting arrangements . 13
6.3.4 Permissible loads . 13
6.3.5 Lifting and transport support . 13
6.3.6 Protective circuit measures . 13
6.3.7 Thermal power dissipation capability . 13
7 Service conditions . 13
7.1 General . 13
7.2 Normal service conditions . 14
7.2.1 Ambient air temperature .
7.2.2 Humidity conditions .
7.3 Special service conditions . 14
7.4 Conditions during transport and storage . 15
8 Design and construction . 15
8.1 General . 15
8.2 Static loads . 16
8.3 Lifting and transport support . 16
8.4 Access to the interior of the enclosure . 16
8.5 Protective circuit .
8.6 Dielectric strength.
8.5 Protection against electric shock . 17
8.5.1 General . 17
8.5.2 Requirements for earth continuity within the class I enclosure . 17
8.5.3 Requirements for class II enclosure . 18
8.6 Degree of protection Protection against mechanical impact (IK code) . 18
8.7 Degree of protection Protection against contact with live parts, ingress of
solid foreign bodies and water (IP code) . 18
8.8 Protection against corrosion . 18
8.9 Enclosures constructed of or covered by insulating material . 18
9 Type tests . 18
9.1 General . 18
9.2 General conditions of tests. 19
9.3 Marking . 20
9.4 Static loads . 20
9.5 Lifting . 21
9.6 Mechanical operation . 21
9.7 Axial loads of metal inserts . 21
9.8 Degree of protection against external mechanical impacts (IK code) . 22
9.9 Degree of protection (IP code) . 23
9.9.1 Degree of protection against access to hazardous parts and against the
ingress of solid foreign objects indicated by first characteristic numeral . 23
9.9.2 Degree of protection against ingress of water as indicated by second
characteristic numeral . 23
9.9.3 Degree of protection against hazardous parts as indicated by additional
letter . 24
9.10 Properties of insulating materials . 24
9.10.1 Thermal stability . 24
9.10.2 Resistance to normal heat . 24
9.10.3 Resistance to abnormal heat and to fire due to internal electric effects . 25
9.11 Dielectric strength. 26
9.11.1 General . 26
9.11.2 Preconditioning . 26
9.11.3 Enclosures without metal elements inside the protected space . 26
9.11.4 Enclosures having metal elements inside the protected space . 27
9.11.5 Results to be obtained . 27
9.12 Effective earth continuity between the exposed-conductive-parts of the class
I enclosure and the protective circuit . 27
9.13 Resistance to ultra-violet (UV) radiation . 28
9.13.1 Verification by test . 28
9.13.2 Verification by comparison to a reference design . 29
9.14 Resistance to corrosion . 29
9.14.1 General . 29
9.14.2 Test procedure . 29
9.14.3 Results to be obtained . 30
9.15 Thermal power dissipation capability . 30
9.15.1 General . 31
9.15.2 Determination of the power dissipation capability by test. 31
9.15.3 Determination of the power dissipation capability by calculation and
comparison . 31
9.15.4 Determination of the power dissipation capability by calculation method . 31
Annex A (informative) List of notes concerning certain countries . 33
Bibliography . 34
List of comments . 35
Table 1 – Climatic conditions . 14
Table 2 – Number of samples to be tested and order of test per sample . 19
Table 3 – Axial loads of metal inserts . 22
Table 4 – Dielectric test voltage . 27
– 4 – IEC 62208:2023 CMV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EMPTY ENCLOSURES FOR LOW-VOLTAGE
SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
GENERAL REQUIREMENTS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
This commented version (CMV) of the official standard IEC 62208:2023 edition 3.0 allows
the user to identify the changes made to the previous IEC 62208:2011
edition 2.0. Furthermore, comments from IEC SC 121B experts are provided to explain
the reasons of the most relevant changes, or to clarify any part of the content.
A vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text. Experts' comments are identified by a
blue-background number. Mouse over a number to display a pop-up note with the
comment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.
IEC 62208 has been prepared by subcommittee 121B: Low-voltage switchgear and controlgear
assemblies, of IEC technical committee 121: Switchgear and controlgear and their assemblies
for low voltage. It is an International Standard.
This third edition cancels and replaces the second edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) consideration of the modifications introduced in IEC 61439-1:2020;
b) alignment of test procedures with the newest relevant standards.
The text of this International Standard is based on the following documents:
Draft Report on voting
121B/180/FDIS 121B/180/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The reader's attention is drawn to the fact that Annex A lists all of the "in-some-country" clauses
on differing practices of a less permanent nature relating to the subject of this document.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under 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.
IMPORTANT – The "colour inside" logo on the cover page of this document 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.
– 6 – IEC 62208:2023 CMV © IEC 2023
INTRODUCTION
The purpose of this document is to harmonize as far as practicable all rules and requirements
of a general nature applicable to empty enclosures for low-voltage switchgear and controlgear
assemblies, in order to obtain uniformity of requirements and verification for empty enclosures
and to avoid the need for verification in other standards.
EMPTY ENCLOSURES FOR LOW-VOLTAGE
SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
GENERAL REQUIREMENTS
1 Scope
This document applies to empty enclosures, as provided by the enclosure manufacturer, prior
to the incorporation of switchgear and controlgear components by the user, as supplied by the
enclosure the assembly manufacturer. 1
This document specifies general definitions, classifications, characteristics and test
requirements of enclosures to be used as part of switchgear and controlgear assemblies (e.g.
in accordance with the product standard in the IEC 61439 series), the rated voltage of which
does not exceed 1 000 V AC or 1 500 V DC, and suitable for general use for either indoor or
outdoor applications.
NOTE 1 Additional requirements may could apply for specific applications.
NOTE 2 The United States of America (USA) uses enclosure “Type” designations according to NEMA 250. The
NEMA Enclosure Type designations specify additional environmental requirements for conditions such as corrosion,
rust, icing, oil, and coolants. For this reason, the IEC Enclosure Classification Designations IP are used with an
enclosure Type designation number appropriate for these markets. 2
NOTE 2 Empty enclosures according to this document are suitable for mounting of electrical components.
This document does not apply to enclosures which are covered by other specific products
standards (e.g. IEC 60670 series IEC 60670-24).
Compliance with the safety requirements of the applicable product standard for the final product
produced using an empty enclosure is the responsibility of the assembly manufacturer. 3
NOTE 3 This document may could serve as a basis for other technical committees.
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 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-11:19812021, Basic Environmental testing procedures – Part 2-11: Tests – Test
Ka: Salt mist
IEC 60068-2-30:2005, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
(12 h + 12 h cycle)
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation
IEC 60364 (all parts), Low-voltage electrical installations
– 8 – IEC 62208:2023 CMV © IEC 2023
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60695-2-10:20002021, Fire hazard testing – Part 2-10: Glowing/hot-wire based test
methods – Glow-wire apparatus and common test procedure
IEC 60695-2-11:20002021, Fire hazard testing – Part 2-11: Glowing/hot-wire based test
methods – Glow-wire flammability test methods for end-products (GWEPT)
IEC 60695-10-2:2014, Fire hazard testing − Part 10-2: Abnormal heat − Ball pressure test
method
IEC 60695-11-5:2016; Fire hazard testing – Part 11-5: Test flames – Needle-flame test method
– Apparatus, confirmatory test arrangement and guidance
IEC TR 60890:2014, A method of temperature-rise verification of low-voltage switchgear and
controlgear assemblies by calculation
IEC 61439-1:2011, low-voltage switchgear and controlgear assemblies – Part 1: General rules
IEC 62262:2002, Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62262:2002/AMD1:2021
ISO 178:20012019, Plastics – Determination of flexural properties
ISO 179 (all parts), Plastics – Determination of Charpy impact properties
ISO 179-1:2010, Plastics – Determination of Charpy impact properties – Part 1:
Non-instrumented impact test
ISO 179-2:2020, Plastics – Determination of Charpy impact properties – Part 2: Instrumented
impact test
ISO 2409:20072020, Paints and varnishes – Cross-cut test
ISO 4628-3:20032016, Paints and varnishes – Evaluation of degradation of coatings –
Designation of quantity and size of defects, and of intensity of uniform changes in appearance
– Part 3: Assessment of degree of rusting
ISO 4892-2:20062013, Plastics – Methods of exposure to laboratory light sources – Part 2:
Xenon-arc sources lamps
Amendment 1 (2009)
ISO 11469:20002016, Plastics – Generic identification and marking of plastic products
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
There is a consolidated edition 2.1 (2001) that includes IEC 60529 (1989) and its Amendment 1 (1999).
To be published.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
empty enclosure
enclosure intended for support and installation of electrical equipment, whose internal space
provides suitable protection against external influences as well as a specified degree of
protection against approach to or contact with live parts and against contact with moving parts
Note 1 to entry: Throughout this document, the word enclosure is used for empty enclosure.
Note 2 to entry: For the purposes of this document, the terms boxes, cubicles, desks or cabinets are alternative
terms for enclosures.
3.2
protected space
internal space or portion of the internal space of the enclosure as specified by the manufacturer
intended for the mounting of switchgear and controlgear for which the specified protection is
provided by the enclosure
internal space or portion of an enclosure as specified by the enclosure manufacturer intended
to enclose electrical components, and which provides defined protection against external
influences and contact with live parts 4
3.3
cover
external part of the enclosure
3.4
door
hinged or sliding cover
3.5
mounting plate
separate internal accessory of the enclosure intended for the mounting of electrical components
3.6
cable gland plate
removable accessory of the enclosure, intended for securing and sealing of cables, conductors
and conduits at their point of entry
3.7
removable cover
cover which is designed for closing an opening in the external enclosure and which can be
removed for carrying out certain operations and maintenance work
Note 1 to entry: A lid is considered as a removable cover.
3.8
enclosure manufacturer
manufacturer of an enclosure or the vendor who resells under his own responsibility 5
3.8
inspection 6
action comprising careful scrutiny, including visual scrutiny where conditions are obvious, of an
item carried out either without dismantling, or with the addition of partial dismantling as required,
– 10 – IEC 62208:2023 CMV © IEC 2023
supplemented by means such as measurement, in order to arrive at a reliable conclusion as to
the condition of an item
[SOURCE: IEC 60050-426:2020, 426-14-02, modified – "including visual scrutiny where
conditions are obvious" has been added.]
3.9
rated insulation voltage 7
U
i
value of the RMS withstand voltage assigned by the enclosure manufacturer to the enclosure
or to a part of it, characterizing the specified (long-term) withstand capability of its insulation
[SOURCE: IEC 60050-312:2014, 312-06-02, modified – Symbol U has been added, in the
i
definition "rated value" has been replaced by "value", "enclosure" has been added to
manufacturer, "equipment" has been replaced by "enclosure" and the Note has been deleted.]
3.10
class I enclosure 8
enclosure with at least one provision for a basic protection and a connection to a protective
conductor as provision for fault protection
Note 1 to entry: See IEC 61140:2016, 7.3 for further details.
[SOURCE: IEC 61439-1:2020, 3.7.24, modified – "assembly" has been replaced by "enclosure"
and Note 2 to entry has been deleted.]
3.11
class II enclosure 8
enclosure which is provided with the following;
• basic insulation as provision for basic protection, and
• supplementary insulation as provision for fault protection,
or in which
• basic protection and fault protection are provided by reinforced insulation
Note 1 to entry: See IEC 61140:2016, 7.4 for further details.
[SOURCE: IEC 61439-1:2020, 3.7.25, modified – "assembly" has been replaced by
"enclosure".]
3.12
empty enclosure for indoor installation 9
empty enclosure that is designed for use in locations where the normal service conditions for
indoor use as specified in Clause 7 apply
3.13
empty enclosure for outdoor installation 10
empty enclosure that is designed for use in locations where the normal service conditions for
outdoor use as specified in Clause 7 apply
4 Classification
Enclosures are classified according to:
a) the type of material:
• insulating;
• metallic;
• combination of insulating and metallic.
b) method of fixing mounting:
• floor standing;
• wall mounting;
• flush mounting;
• pole mounting.
c) the intended location:
• outdoor;
• indoor.
d) the degree of protection:
• IP code, according to IEC 60529:1989 and IEC 60529:1989/AMD1:1999 and
AMD2:2013;
• IK code, according to IEC 62262:2002 and IEC 62262:2002/AMD1:2021.
e) the rated insulation voltage (for enclosures made of insulating materials).
5 Electromagnetic compatibility (EMC requirements)
EMC requirements are not applicable for enclosures according to this document.
NOTE For degrees of protection provided by enclosures against electromagnetic disturbances (EM code), see
IEC 61000-5-7. EMC is not a basic requirement for empty enclosures to this document. However, when enclosure
manufacturers want to assign a degree of protection against electromagnetic disturbances (EM code) it is referred
to IEC 61000-5-7:2001. 11
6 Information to be given regarding the enclosure
6.1 General
The following information shall be given by the enclosure manufacturer.
6.2 Marking
The enclosure shall be identifiable, making it possible for the assembly manufacturer to obtain
relevant information from the enclosure manufacturer. Such identification shall comprise:
• either the name, trade mark or identification mark of the enclosure manufacturer;
• type designation or identification number of the enclosure.
The marking shall be durable and easily legible and may can be inside the enclosure.
Compliance is checked according to the test of 9.3 and by inspection.
Marking for the recycling of plastic parts shall be as stated in ISO 11469.
NOTE Marking of enclosures intended used for total insulation (equivalent to class II)
assemblies with the symbol IEC 60417-5172 (2003-02) is the responsibility of the assembly
manufacturer. 12
– 12 – IEC 62208:2023 CMV © IEC 2023
6.3 Documentation
6.3.1 General 13
The enclosure manufacturer’s documentation shall include all relevant constructional,
mechanical characteristics,:
– the enclosure classification (see Clause 4);
– any instruction necessary for the correct handling, assembling, mounting and service
conditions of the enclosure;
– a reference to this document, and
– the following characteristics:
• dimensions (see 6.3.2);
• mounting arrangements (6.3.3);
• permissible loads (see 6.3.4);
• lifting and transport devices, if necessary (see 6.3.5);
• provisions for protection against electric shock (see 6.3.6);
• protective measures (see 6.3.6);
• data of thermal power dissipation capability (see 6.3.7);
• applicable service conditions (see Clause 7);
• location and size of protected space (see 3.2);
• rated insulation voltage U of enclosures constructed of an insulating material and Class
i
II enclosures (see 9.11.3, Table 4); 14
• degree of protection (IK and IP codes, see 8.7 and 8.8).
• degree of protection against mechanical impact (IK code, see 8.6);
• degree of protection against contact with hazardous live parts, ingress of solid foreign
bodies and water (IP code, see 8.7);
• maximum permissible temperatures inside for which enclosures constructed of insulating
material is suitable (see 9.10.2). 15
The data for the thermal power dissipation capability are a function of the admissible
temperature inside the enclosure. They shall be provided for the different installation methods
(e.g. flush mounting, surface mounting) of the enclosure and of the design of the enclosure, i.e.
with or without ventilation openings and number of horizontal partitions. They shall include at
least temperature rise inside the enclosure, at the top, and external surfaces temperature rise,
for a given power loss inside the enclosure. This will provide the user with the correct data for
the selection of the enclosure according to electrical equipment to be installed. For the purpose
of the calculation, it is assumed that the heat generated by the selected equipment is distributed
uniformly inside the protected space. 16
6.3.2 Dimensions
The dimensions shall be given in millimetres.
The external dimensions (height, width and depth) are nominal values and shall be indicated in
the catalogue of the enclosure manufacturer.
and plates, removable covers and handles shall not be included in the
The projection of cable gl
external nominal dimensions, the dimensions of such shall be included in the enclosure
manufacturer’s documentation.
6.3.3 Mounting arrangements
The means and location of the enclosure mounting arrangements shall be defined in the
enclosure manufacturer’s documentation.
The location of the equipment mounting surfaces and their means of fixing shall be defined in
the enclosure manufacturer's documentation. 17
6.3.4 Permissible loads
The permissible loads that the enclosure, mounting plates, switchgear and controlgear supports
and its doors are able to carry shall be defined in the enclosure manufacturer’s documentation.
The load shall be given in Newtons.
If the enclosure includes or can include a mounting plate or switchgear and controlgear
supports, the permissible load that the accessory can carry, according to the fixing means
provided inside the enclosure, shall be defined in the enclosure manufacturer’s documentation.
(see also 8.2).
6.3.5 Lifting and transport support
Where required, the correct location and installation of lifting and transport support and the
thread size of lifting devices, if applicable, shall be given in the enclosure manufacturer’s
documentation or in the instructions on how the enclosure has to be handled (see also 8.3).
6.3.6 Protective circuit measures
The enclosure manufacturer shall indicate in the technical documentation if the enclosure is
suitable for a class I or class II assembly.
In the case of a class I enclosure, the enclosure manufacturer shall indicate if the enclosure
ensures electrical continuity throughout by the conductive structural parts of the enclosure or if
and how separate protective conductors to the protective circuits of the installation shall be
carried out (see also 8.5).
6.3.7 Thermal power dissipation capability
The data for the thermal power dissipation capability are a function of the admissible
temperature inside the enclosure. They shall be provided for the intended mounting methods
(e.g. flush mounting, surface mounting) of the enclosure and of the design of the enclosure, i.e.
with or without ventilation openings and number of horizontal partitions. They shall include at
least temperature rise inside the enclosure at the top, for a given power loss inside the
enclosure. This will provide the assembly manufacturer with the correct data for the selection
of the enclosure according to electrical equipment to be installed. The data for the thermal
power dissipation capability shall be defined in the enclosure manufacturer’s documentation
(see also 9.15).
7 Service conditions
7.1 General
Enclosures conforming to this document are intended for use under the following service
conditions.
The enclosure manufacturer shall specify the locations for which the enclosure is intended.
– 14 – IEC 62208:2023 CMV © IEC 2023
7.2 Normal service conditions
7.2.1 Ambient air temperature
7.2.1.1 Ambient air temperature for indoor locations
The ambient air temperature does not exceed +40 °C and its average over a period of 24 h
does not exceed +35 °C.
The lower limit of the ambient air temperature is –5 °C.
7.2.1.2 Ambient air temperature for outdoor locations
The ambient air temperature does not exceed +40 °C and its average over a period of 24 h
does not exceed +35 °C.
The lower limit of the ambient air temperature is –25 °C.
7.2.2 Humidity conditions
7.2.2.1 Humidity conditions for indoor locations
The relative humidity of the air does not exceed 50 % at a maximum temperature of +40 °C.
Higher relative humidity may be permitted at lower temperatures, for example 90 % at +20 °C.
Moderate condensation should be borne in mind which may occasionally occur due to variations
in temperature.
7.2.2.2 Humidity conditions for outdoor locations
The relative humidity may be temporarily as high as 100 % at a maximum temperature of
+25 °C.
Enclosures conforming to this document are intended for use under the normal service
conditions detailed in Table 1.
Table 1 – Climatic conditions 18
Indoor installations Outdoor installations
Environmental parameter
Lower limit Upper limit Lower limit Upper limit
+40 °C +40 °C
average over a period of average over a period of
Ambient air temperature −5 °C −25 °C
24 h does not exceed 24 h does not exceed
+35 °C +35 °C
−5…+30 °C: 95 % −25…+27 °C: 100 %
a
5 % +35 °C: 70 % 15 % +35 °C: 60 %
Humidity conditions
+40 °C: 57 % +40 °C: 46 %
a
Relationship between air temperature and humidity is given in IEC 60721-3-3:2019, Figure A.1. Moderate
condensation should be borne in mind which can occasionally occur due to variations in temperature.
7.3 Special service conditions
Where any of the following special service conditions exist, the applicable particular requirements shall be subject
to agreement between user and manufacturer.
Examples of such conditions may include the following:
• abnormal ambient air temperature and humidity;
• presence of corrosive substances;
• presence of particular dusts (coal, cement, etc.);
• abnormal mechanical stresses (seismic, etc.);
• presence of fauna, flora, mould;
• ionizing influences;
• electromagnetic interferences;
• vibrations;
• UV radiation other than solar.
Agreements reached shall not contradict any safety regulations in force.
Special service conditions can be induced by particular conditions required in product standards
or by user requirement. The user shall inform the enclosure manufacturer if such special service
conditions exist.
NOTE If any special condition requires a specific test or verification, and there is no standardized test method, the
test method to be carried out will be by an agreement between the manufacturer and the user.
Examples of such conditions can include the following:
• values of ambient air temperature and/or humidity differing from those defined in Subclause
7.2, Table 1;
• applications where variations in climatic conditions are likely to result in exceptional
condensation inside the enclosure;
• heavy pollution of the air due to presence of dust (coal, cement, etc.), smoke, corrosive or
radioactive substances, vapours or salt;
• exposure to abnormal mechanical stresses (heavy vibrations, shocks, seismic occurrences,
etc.);
• presence of fauna, flora, mould, fungus or small creatures;
• ionizing influences;
• electromagnetic interferences;
, microwave, ultraviolet
• exposure to any type of radiation (for example, solar radiation, X-rays
other than solar, lasers, etc.). 19
7.4 Conditions during transport and storage
A special agreement shall be made between the enclosure manufacturer and the user if the
conditions during transport, storage and installation, for example temperature and humidity
conditions, differ from those defined in 7.2.
8 Design and construction
8.1 General
The enclosure shall be constructed only of materials capable of withstanding the mechanical,
electrical and thermal stresses, as specified in Clause 9, as well as the effects of humidity which
are likely to be encountered in normal use.
Protection against corrosion shall be ensured by the use of suitable materials or by the
application of protective coating to the exposed surface, taking into account the intended
conditions of use.
Compliance to this requirement is checked by the test of 9.13. 20
– 16 – IEC 62208:2023 CMV © IEC 2023
In addition for enclosures or parts of enclosures made of insulating materials, thermal stability,
resistance to heat, fire and weathering shall be verified according to the tests of 9.9 and 9.12. 21
The enclosure manufacturer shall state in its documentation if mounting accessories or methods
of mounting affects the technical characteristics of the enclosure.
8.2 Static loads
issible load that the enclosure and its doors are able to carry is checked
Compliance of the perm
according to the test of 9.4.
The enclosure manufacturer shall specify the maximum permissible static load that the
enclosure and its doors are able to carry.
If the enclosure includes or can include a mounting plate or switchgear and controlgear
supports, the enclosure manufacturer shall also specify the maximum permissible load of that
accessory according to the fixing means provided, except when the mounting plate and any
convenient support are designed, manufactured and tested for a specific equipment (e.g. for a
specific brand or manufacturer).
If the enclosure manufacturer offers plinths, wheels, levelling feet or other similar accessories
intended to be used for the enclosure, then the enclosure manufacturer shall declare the
maximum static load with these accessories. 22
Compliance is checked according to the test of 9.4.
8.3 Lifting and transport support
Where required, enclosures shall be provided with the appropriate lifting devices or transport
means.
If the enclosure is equipped or delivered together with lifting and transport supports, the
enclosure manufacturer shall indicate in the technical documentation the correct location and
installation of these supports, the thread size of lifting devices (if applicable), how the enclosure
has to be handled, and the maximum weight for handling without lifting.
Compliance is checked according to the test of 9.5.
8.4 Access to the interior of the enclosure
Adequate access to the protected space shall be provided by means of (a) door(s) or removable
cover(s). Access may be restricted by the use of a key or tool. to provide a degree of protection
to prevent contact with live parts with an enclosure used in an electric system, in accordance
with 8.5.
Cable gland plates and covers which are removable from the outside shall require the use of a
tool.
8.5 Protective circuit
Metallic enclosures shall ensure electrical continuity throughout either by the conductive
structural parts of the enclosure or provisions for a separate protective conductor to earth or
both.
When a removable part of an enclosure is removed, the protective circuit for the remainder of
the enclosure shall not be interrupted.
For lids, doors, removable covers and the like, the usual metal screwed connections and metal
hinges may ensure continuity of the protective circuit provided no electrical equipment is
attached to them. Where these are intended for mounting electrical equipment additional means
shall be provided to ensure the continuity of the protective circuit.
Com
...
IEC 62208 ®
Edition 3.0 2023-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Empty enclosures for low-voltage switchgear and controlgear assemblies –
General requirements
Enveloppes vides destinées aux ensembles d'appareillage à basse tension –
Exigences générales
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IEC 62208 ®
Edition 3.0 2023-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Empty enclosures for low-voltage switchgear and controlgear assemblies –
General requirements
Enveloppes vides destinées aux ensembles d'appareillage à basse tension –
Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-7071-4
– 2 – IEC 62208:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Classification . 10
5 Electromagnetic compatibility (EMC) . 11
6 Information to be given regarding the enclosure . 11
6.1 General . 11
6.2 Marking . 11
6.3 Documentation . 11
6.3.1 General . 11
6.3.2 Dimensions . 12
6.3.3 Mounting arrangements . 12
6.3.4 Permissible loads . 12
6.3.5 Lifting and transport support . 12
6.3.6 Protective measures . 12
6.3.7 Thermal power dissipation capability . 13
7 Service conditions . 13
7.1 General . 13
7.2 Normal service conditions . 13
7.3 Special service conditions . 13
7.4 Conditions during transport and storage . 14
8 Design and construction . 14
8.1 General . 14
8.2 Static loads . 14
8.3 Lifting and transport support . 14
8.4 Access to the interior of the enclosure . 15
8.5 Protection against electric shock . 15
8.5.1 General . 15
8.5.2 Requirements for earth continuity within the class I enclosure . 15
8.5.3 Requirements for class II enclosure . 15
8.6 Protection against mechanical impact (IK code) . 16
8.7 Protection against contact with live parts, ingress of solid foreign bodies and
water (IP code) . 16
8.8 Protection against corrosion . 16
8.9 Enclosures constructed of or covered by insulating material . 16
9 Type tests . 16
9.1 General . 16
9.2 General conditions of tests. 16
9.3 Marking . 17
9.4 Static loads . 17
9.5 Lifting . 18
9.6 Mechanical operation . 18
9.7 Axial loads of metal inserts . 18
9.8 Degree of protection against external mechanical impacts (IK code) . 19
9.9 Degree of protection (IP code) . 20
9.9.1 Degree of protection against access to hazardous parts and against the
ingress of solid foreign objects indicated by first characteristic numeral . 20
9.9.2 Degree of protection against ingress of water as indicated by second
characteristic numeral . 20
9.9.3 Degree of protection against hazardous parts as indicated by additional
letter . 21
9.10 Properties of insulating materials . 21
9.10.1 Thermal stability . 21
9.10.2 Resistance to normal heat . 21
9.10.3 Resistance to abnormal heat and fire due to internal electric effects . 22
9.11 Dielectric strength . 23
9.11.1 General . 23
9.11.2 Preconditioning . 23
9.11.3 Enclosures without metal elements inside the protected space . 23
9.11.4 Enclosures having metal elements inside the protected space . 24
9.11.5 Results to be obtained . 24
9.12 Effective earth continuity between the exposed-conductive-parts of the class
I enclosure and the protective circuit . 24
9.13 Resistance to ultra-violet (UV) radiation . 24
9.13.1 Verification by test . 24
9.13.2 Verification by comparison to a reference design . 25
9.14 Resistance to corrosion . 26
9.14.1 General . 26
9.14.2 Test procedure . 26
9.14.3 Results to be obtained . 27
9.15 Thermal power dissipation capability . 27
9.15.1 General . 27
9.15.2 Determination of the power dissipation capability by test . 27
9.15.3 Determination of the power dissipation capability by calculation and
comparison . 28
9.15.4 Determination of the power dissipation capability by calculation method . 28
Annex A (informative) List of notes concerning certain countries . 29
Bibliography . 30
Table 1 – Climatic conditions . 13
Table 2 – Number of samples to be tested and order of test per sample . 17
Table 3 – Axial loads of metal inserts . 19
Table 4 – Dielectric test voltage . 24
– 4 – IEC 62208:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EMPTY ENCLOSURES FOR LOW-VOLTAGE
SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
GENERAL REQUIREMENTS
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.
IEC 62208 has been prepared by subcommittee 121B: Low-voltage switchgear and controlgear
assemblies, of IEC technical committee 121: Switchgear and controlgear and their assemblies
for low voltage. It is an International Standard.
This third edition cancels and replaces the second edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) consideration of the modifications introduced in IEC 61439-1:2020;
b) alignment of test procedures with the newest relevant standards.
The text of this International Standard is based on the following documents:
Draft Report on voting
121B/180/FDIS 121B/180/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The reader's attention is drawn to the fact that Annex A lists all of the "in-some-country" clauses
on differing practices of a less permanent nature relating to the subject of this document.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under 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.
– 6 – IEC 62208:2023 © IEC 2023
INTRODUCTION
The purpose of this document is to harmonize as far as practicable all rules and requirements
of a general nature applicable to empty enclosures for low-voltage switchgear and controlgear
assemblies, in order to obtain uniformity of requirements and verification for empty enclosures
and to avoid the need for verification in other standards.
EMPTY ENCLOSURES FOR LOW-VOLTAGE
SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
GENERAL REQUIREMENTS
1 Scope
This document applies to empty enclosures, as provided by the enclosure manufacturer, prior
to the incorporation of switchgear and controlgear components by the assembly manufacturer.
This document specifies general definitions, classifications, characteristics and test
requirements of enclosures to be used as part of switchgear and controlgear assemblies (e.g.
in accordance with the product standard in the IEC 61439 series), the rated voltage of which
does not exceed 1 000 V AC or 1 500 V DC, and suitable for general use for either indoor or
outdoor applications.
NOTE 1 Additional requirements could apply for specific applications.
NOTE 2 Empty enclosures according to this document are suitable for mounting of electrical components.
This document does not apply to enclosures which are covered by other specific products
standards (e.g. IEC 60670-24).
Compliance with the safety requirements of the applicable product standard for the final product
produced using an empty enclosure is the responsibility of the assembly manufacturer.
NOTE 3 This document could serve as a basis for other technical committees.
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 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-11:2021, Environmental testing – Part 2-11: Tests – Test Ka: Salt mist
IEC 60068-2-30:2005, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
(12 h + 12 h cycle)
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation
IEC 60364 (all parts), Low-voltage electrical installations
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60695-2-10:2021, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods –
Glow-wire apparatus and common test procedure
IEC 60695-2-11:2021, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test methods for end-products (GWEPT)
– 8 – IEC 62208:2023 © IEC 2023
IEC 60695-10-2:2014, Fire hazard testing − Part 10-2: Abnormal heat − Ball pressure test
method
IEC 60695-11-5:2016; Fire hazard testing – Part 11-5: Test flames – Needle-flame test method
– Apparatus, confirmatory test arrangement and guidance
IEC TR 60890:2014, A method of temperature-rise verification of low-voltage switchgear and
controlgear assemblies by calculation
IEC 62262:2002, Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62262:2002/AMD1:2021
ISO 178:2019, Plastics – Determination of flexural properties
ISO 179-1:2010, Plastics – Determination of Charpy impact properties – Part 1:
Non-instrumented impact test
ISO 179-2:2020, Plastics – Determination of Charpy impact properties – Part 2: Instrumented
impact test
ISO 2409:2020, Paints and varnishes – Cross-cut test
ISO 4628-3:2016, Paints and varnishes – Evaluation of degradation of coatings – Designation
of quantity and size of defects, and of intensity of uniform changes in appearance – Part 3:
Assessment of degree of rusting
ISO 4892-2:2013, Plastics – Methods of exposure to laboratory light sources – Part 2:
Xenon-arc lamps
ISO 11469:2016, Plastics – Generic identification and marking of plastic products
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
empty enclosure
enclosure intended for support and installation of electrical equipment, whose internal space
provides suitable protection against external influences as well as a specified degree of
protection against approach to or contact with live parts and against contact with moving parts
Note 1 to entry: Throughout this document, the word enclosure is used for empty enclosure.
Note 2 to entry: For the purposes of this document, the terms boxes, cubicles, desks or cabinets are alternative
terms for enclosures.
3.2
protected space
internal space or portion of an enclosure as specified by the enclosure manufacturer intended
to enclose electrical components, and which provides defined protection against external
influences and contact with live parts
3.3
cover
external part of the enclosure
3.4
door
hinged or sliding cover
3.5
mounting plate
separate internal accessory of the enclosure intended for the mounting of electrical components
3.6
cable gland plate
removable accessory of the enclosure, intended for securing and sealing of cables, conductors
and conduits at their point of entry
3.7
removable cover
cover which is designed for closing an opening in the external enclosure and which can be
removed for carrying out certain operations and maintenance work
Note 1 to entry: A lid is considered as a removable cover.
3.8
inspection
action comprising careful scrutiny, including visual scrutiny where conditions are obvious, of an
item carried out either without dismantling, or with the addition of partial dismantling as required,
supplemented by means such as measurement, in order to arrive at a reliable conclusion as to
the condition of an item
[SOURCE: IEC 60050-426:2020, 426-14-02, modified – "including visual scrutiny where
conditions are obvious" has been added.]
3.9
rated insulation voltage
U
i
value of the RMS withstand voltage assigned by the enclosure manufacturer to the enclosure
or to a part of it, characterizing the specified (long-term) withstand capability of its insulation
[SOURCE: IEC 60050-312:2014, 312-06-02, modified – Symbol U has been added, in the
i
definition "rated value" has been replaced by "value", "enclosure" has been added to
manufacturer, "equipment" has been replaced by "enclosure" and the Note has been deleted.]
– 10 – IEC 62208:2023 © IEC 2023
3.10
class I enclosure
enclosure with at least one provision for a basic protection and a connection to a protective
conductor as provision for fault protection
Note 1 to entry: See IEC 61140:2016, 7.3 for further details.
[SOURCE: IEC 61439-1:2020, 3.7.24, modified – "assembly" has been replaced by "enclosure"
and Note 2 to entry has been deleted.]
3.11
class II enclosure
enclosure which is provided with the following;
• basic insulation as provision for basic protection, and
• supplementary insulation as provision for fault protection,
or in which
• basic protection and fault protection are provided by reinforced insulation
Note 1 to entry: See IEC 61140:2016, 7.4 for further details.
[SOURCE: IEC 61439-1:2020, 3.7.25, modified – "assembly" has been replaced by
"enclosure".]
3.12
empty enclosure for indoor installation
empty enclosure that is designed for use in locations where the normal service conditions for
indoor use as specified in Clause 7 apply
3.13
empty enclosure for outdoor installation
empty enclosure that is designed for use in locations where the normal service conditions for
outdoor use as specified in Clause 7 apply
4 Classification
Enclosures are classified according to:
a) the type of material:
• insulating;
• metallic;
• combination of insulating and metallic.
b) method of mounting:
• floor standing;
• wall mounting;
• flush mounting;
• pole mounting.
c) the intended location:
• outdoor;
• indoor.
d) the degree of protection:
• IP code, according to IEC 60529:1989 and IEC 60529:1989/AMD1:1999 and
AMD2:2013;
• IK code, according to IEC 62262:2002 and IEC 62262:2002/AMD1:2021.
5 Electromagnetic compatibility (EMC)
EMC requirements are not applicable for enclosures according to this document.
NOTE EMC is not a basic requirement for empty enclosures to this document. However, when enclosure
manufacturers want to assign a degree of protection against electromagnetic disturbances (EM code) it is referred
to IEC 61000-5-7:2001.
6 Information to be given regarding the enclosure
6.1 General
The following information shall be given by the enclosure manufacturer.
6.2 Marking
The enclosure shall be identifiable, making it possible for the assembly manufacturer to obtain
relevant information from the enclosure manufacturer. Such identification shall comprise:
• either the name, trade mark or identification mark of the enclosure manufacturer;
• type designation or identification number of the enclosure.
The marking shall be durable and easily legible and can be inside the enclosure.
Compliance is checked according to the test of 9.3 and by inspection.
Marking for the recycling of plastic parts shall be as stated in ISO 11469.
Marking of enclosures used for class II assemblies with the symbol IEC 60417-5172
(2003-02) is the responsibility of the assembly manufacturer.
6.3 Documentation
6.3.1 General
The enclosure manufacturer’s documentation shall include:
– the enclosure classification (see Clause 4);
– any instruction necessary for the correct handling, assembling, mounting and service
conditions of the enclosure;
– a reference to this document, and
– the following characteristics:
• dimensions (see 6.3.2);
• mounting arrangements (6.3.3);
• permissible loads (see 6.3.4);
• lifting and transport devices, if necessary (see 6.3.5);
• protective measures (see 6.3.6);
• thermal power dissipation capability (see 6.3.7);
• applicable service conditions (see Clause 7);
– 12 – IEC 62208:2023 © IEC 2023
• location and size of protected space (see 3.2);
• rated insulation voltage U of enclosures constructed of an insulating material and Class
i
II enclosures (see 9.11.3, Table 4);
• degree of protection against mechanical impact (IK code, see 8.6);
• degree of protection against contact with hazardous live parts, ingress of solid foreign
bodies and water (IP code, see 8.7);
• maximum permissible temperatures inside for which enclosures constructed of insulating
material is suitable (see 9.10.2).
6.3.2 Dimensions
The dimensions shall be given in millimetres.
The external dimensions (height, width and depth) are nominal values and shall be indicated in
the catalogue of the enclosure manufacturer.
The projection of cable gland plates, removable covers and handles shall not be included in the
external nominal dimensions, the dimensions of such shall be included in the enclosure
manufacturer’s documentation.
6.3.3 Mounting arrangements
The means and location of the enclosure mounting arrangements shall be defined in the
enclosure manufacturer’s documentation.
6.3.4 Permissible loads
The permissible loads that the enclosure, mounting plates, switchgear and controlgear supports
and doors are able to carry shall be defined in the enclosure manufacturer’s documentation.
The load shall be given in Newtons.
If the enclosure includes or can include a mounting plate or switchgear and controlgear
supports, the permissible load that the accessory can carry, according to the fixing means
provided inside the enclosure, shall be defined in the enclosure manufacturer’s documentation.
(see also 8.2).
6.3.5 Lifting and transport support
Where required, the correct location and installation of lifting and transport support and the
thread size of lifting devices shall be given in the enclosure manufacturer’s documentation or
in the instructions on how the enclosure has to be handled (see also 8.3).
6.3.6 Protective measures
The enclosure manufacturer shall indicate in the technical documentation if the enclosure is
suitable for a class I or class II assembly.
In the case of a class I enclosure, the enclosure manufacturer shall indicate if the enclosure
ensures electrical continuity throughout by the conductive structural parts of the enclosure or if
and how separate protective conductors to the protective circuits of the installation shall be
carried out (see also 8.5).
6.3.7 Thermal power dissipation capability
The data for the thermal power dissipation capability are a function of the admissible
temperature inside the enclosure. They shall be provided for the intended mounting methods
(e.g. flush mounting, surface mounting) of the enclosure and of the design of the enclosure, i.e.
with or without ventilation openings and number of horizontal partitions. They shall include at
least temperature rise inside the enclosure at the top, for a given power loss inside the
enclosure. This will provide the assembly manufacturer with the correct data for the selection
of the enclosure according to electrical equipment to be installed. The data for the thermal
power dissipation capability shall be defined in the enclosure manufacturer’s documentation
(see also 9.15).
7 Service conditions
7.1 General
Enclosures conforming to this document are intended for use under the following service
conditions.
The enclosure manufacturer shall specify the locations for which the enclosure is intended.
7.2 Normal service conditions
Enclosures conforming to this document are intended for use under the normal service
conditions detailed in Table 1.
Table 1 – Climatic conditions
Indoor installations Outdoor installations
Environmental parameter
Lower limit Upper limit Lower limit Upper limit
+40 °C +40 °C
average over a period of average over a period of
Ambient air temperature −5 °C −25 °C
24 h does not exceed 24 h does not exceed
+35 °C +35 °C
−5…+30 °C: 95 % −25…+27 °C: 100 %
a
Humidity conditions 5 % +35 °C: 70 % 15 % +35 °C: 60 %
+40 °C: 57 % +40 °C: 46 %
a
Relationship between air temperature and humidity is given in IEC 60721-3-3:2019, Figure A.1. Moderate
condensation should be borne in mind which can occasionally occur due to variations in temperature.
7.3 Special service conditions
Special service conditions can be induced by particular conditions required in product standards
or by user requirement. The user shall inform the enclosure manufacturer if such special service
conditions exist.
NOTE If any special condition requires a specific test or verification, and there is no standardized test method, the
test method to be carried out will be by an agreement between the manufacturer and the user.
Examples of such conditions can include the following:
• values of ambient air temperature and/or humidity differing from those defined in Subclause
7.2, Table 1;
• applications where variations in climatic conditions are likely to result in exceptional
condensation inside the enclosure;
– 14 – IEC 62208:2023 © IEC 2023
• heavy pollution of the air due to presence of dust (coal, cement, etc.), smoke, corrosive or
radioactive substances, vapours or salt;
• exposure to abnormal mechanical stresses (heavy vibrations, shocks, seismic occurrences,
etc.);
• presence of fauna, flora, mould, fungus or small creatures;
• ionizing influences;
• electromagnetic interferences;
• exposure to any type of radiation (for example, solar radiation, X-rays, microwave, ultraviolet
other than solar, lasers, etc.).
7.4 Conditions during transport and storage
A special agreement shall be made between the enclosure manufacturer and the user if the
conditions during transport, storage and installation, for example temperature and humidity
conditions, differ from those defined in 7.2.
8 Design and construction
8.1 General
The enclosure shall be constructed only of materials capable of withstanding the mechanical,
electrical and thermal stresses, as specified in Clause 9, as well as the effects of humidity which
are likely to be encountered in normal use.
The enclosure manufacturer shall state in its documentation if mounting accessories or methods
of mounting affects the technical characteristics of the enclosure.
8.2 Static loads
The enclosure manufacturer shall specify the maximum permissible static load that the
enclosure and its doors are able to carry.
If the enclosure includes or can include a mounting plate or switchgear and controlgear
supports, the enclosure manufacturer shall also specify the maximum permissible load of that
accessory according to the fixing means provided, except when the mounting plate and any
convenient support are designed, manufactured and tested for a specific equipment (e.g. for a
specific brand or manufacturer).
If the enclosure manufacturer offers plinths, wheels, levelling feet or other similar accessories
intended to be used for the enclosure, then the enclosure manufacturer shall declare the
maximum static load with these accessories.
Compliance is checked according to the test of 9.4.
8.3 Lifting and transport support
If the enclosure is equipped or delivered together with lifting and transport supports, the
enclosure manufacturer shall indicate in the technical documentation the correct location and
installation of these supports, the thread size of lifting devices (if applicable), how the enclosure
has to be handled, and the maximum weight for handling without lifting.
Compliance is checked according to the test of 9.5.
8.4 Access to the interior of the enclosure
Adequate access to the protected space shall be provided by means of (a) door(s) or removable
cover(s). Access may be restricted by the use of a key or tool to provide a degree of protection
to prevent contact with live parts with an enclosure used in an electric system, in accordance
with 8.5.
Cable gland plates and covers which are removable from the outside shall require the use of a
tool.
8.5 Protection against electric shock
8.5.1 General
The following requirements are intended to ensure that the required protective measures are
obtained when an enclosure is used in an electric system conforming to the IEC 60364 series.
8.5.2 Requirements for earth continuity within the class I enclosure
The enclosure manufacturer shall provide means for the connection of an external earthing or
protective conductor.
All exposed-conductive-parts of the enclosure shall be interconnected together and to the
means for the connection of an external earthing or protective conductor.
Certain exposed-conductive-parts (e.g., screws, rivets, nameplates) that do not constitute a
danger need not be connected to the earthing arrangement, either:
– because they cannot be touched on large surfaces or grasped with the hand, or
– because they are of small size (approximately 50 mm by 50 mm) or so located as to exclude
any contact with live parts.
These interconnections may be achieved either by metal screwed connections, welding or other
conductive connections, or by a separate conductor providing earth continuity.
For lids, doors, cover plates and the like, the usual metal screwed connection and metal hinges
are considered sufficient to ensure continuity provided that no electrical equipment is attached
to them.
Compliance is checked according to the test of 9.12.
For the continuity of these connections, the following shall apply:
When a part of the enclosure is removed, for example for routine maintenance, the earth
continuity for the remainder of the enclosure shall not be interrupted.
Means used for assembling the various metal parts of an enclosure are considered sufficient
for ensuring earth continuity if the precautions taken guarantee permanent good conductivity
(see also 9.12).
8.5.3 Requirements for class II enclosure
The enclosure shall be made of insulating material or of sheet metal with the inner walls fully
insulated from internal live parts. In both cases, the insulation shall be equivalent of double or
reinforced insulation.
The enclosure shall at no point be pierced by conducting parts in such a manner that there is
the possibility of a fault voltage being brought out of the enclosure.
– 16 – IEC 62208:2023 © IEC 2023
Compliance is checked according to the test of 9.11 and visual inspection.
8.6 Protection against mechanical impact (IK code)
The degree of protection against mechanical impact, as declared by the enclosure
manufacturer, shall be in accordance with IEC 62262:2002 and IEC 62262:2002/AMD1:2021.
Compliance is checked according to the test of 9.8.
8.7 Protection against contact with live parts, ingress of solid foreign bodies and
water (IP code)
The degree of protection against access to hazardous parts, against ingress of solid foreign
objects and/or against ingress of water, as declared by the enclosure manufacturer, shall be in
accordance with IEC 60529:1989 and IEC 60529:1989/AMD1:1999 and AMD2:2013.
Compliance is checked according to the test of 9.9.
NOTE An enclosure can be assigned differing IP codes dependent upon the declared IK code.
8.8 Protection against corrosion
Protection against corrosion shall be ensured by the use of suitable materials or by the
application of protective coating to the exposed surface, taking into account the intended
conditions of use.
Compliance is checked according to the test of 9.14.
8.9 Enclosures constructed of or covered by insulating material
Enclosures or parts of enclosures constructed of insulating materials or covered by insulating
materials shall fulfil the following additional requirements:
• thermal stability. If the thermal stability of the enclosure relies on insulating materials, then
the compliance is checked according to the test of 9.10.1;
• resistance to normal heat. Compliance is checked according to the test of 9.10.2 (see 6.3.1);
• resistance to abnormal heat and fire. Compliance is checked according to the test of 9.10.3;
• dielectric strength. Compliance is checked according to the test of 9.11;
• resistance to ultra-violet (UV) radiation for outdoor applications, if applicable. Compliance
is checked according to the test of 9.13.
9 Type tests
9.1 General
Tests according to this document are type tests.
9.2 General conditions of tests
The enclosures under test shall be mounted and installed as in normal use according to the
enclosure manufacturer’s instructions.
Unless otherwis
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