IEC 60670-1:2024

IEC 60670-1 ®
Edition 3.0 2024-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Boxes and enclosures for electrical accessories for household and similar fixed
electrical installations –
Part 1: General requirements
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IEC 60670-1 ®
Edition 3.0 2024-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Boxes and enclosures for electrical accessories for household and similar fixed
electrical installations –
Part 1: General requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.10 ISBN 978-2-8327-0093-8

– 2 – IEC 60670-1:2024 RLV © IEC 2024
CONTENTS
FOREWORD . 5
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General requirements . 13
5 General notes remarks on tests . 14
5.1 Test conditions and number of samples . 14
5.2 Compliance general requirement . 14
6 Ratings . 14
7 Classification . 15
8 Marking . 16
8.1 General . 16
8.2 Durability of the marking on the boxes and enclosures . 17
9 Dimensions. 17
10 Protection against electric shock . 19
11 Provision for earthing . 20
11.1 Boxes and enclosures with exposed conductive parts . 20
11.2 Boxes and enclosures of insulating material classified according to 7.2.2.2
and 7.2.2.3 . 20
11.3 Boxes or enclosures with removable sides according to 7.1.2 . 22
11.4 Earthing terminal threads . 22
12 Construction . 22
12.1 General . 22
12.2 Lids, covers or cover-plates or parts of them . 23
12.2.1 General . 23
12.2.2 Screw-type fixing . 23
12.2.3 Non-screw-type fixing operable without the use of a tool or a key . 23
12.2.4 Non-screw-type fixing operable with the use of a tool or a key . 31
12.3 Drain holes . 31
12.4 Mounting of enclosures . 31
12.5 Boxes and enclosures with inlets for flexible cables . 32
12.6 Boxes and enclosures with inlets for applications other than flexible cables . 32
12.7 Boxes and enclosures with a cable anchorage(s) . 32
12.8 Boxes and enclosures with cable retention means . 34
12.9 Knock-outs intended to be removed by mechanical impact . 35
12.9.1 General . 35
12.9.2 Knock-out retention . 35
12.9.3 Knock-out removal . 35
12.9.4 Flat surfaces surrounding knock-outs . 36
12.10 Screw fixings . 36
12.11 Fixing of boxes and enclosures classified according to 7.2.1 . 37
12.12 Fixing of flush type and semi-flush type boxes and enclosures classified
according to 7.2.2.1 . 40
12.13 Boxes and enclosures classified according to 7.2.2.2 and 7.2.2.3 . 42
12.13.1 General . 42
12.13.2 Boxes intended for mounting on a wooden structural member of a wall . 42

12.13.3 Boxes intended for mounting to a wooden structural member of a ceiling . 42
12.13.4 Boxes intended for mounting to a steel-stud structural member of a wall . 42
12.13.5 Internal volume of boxes and enclosures classified according to 7.2.2.2
and 7.2.2.3 . 43
12.13.6 Boxes intended for mounting in a finished structure . 44
12.14 Cable gland entry . 44
12.15 Boxes and enclosures with inlets (outlets) or spouts (hubs) for conduits . 45
12.16 Internal volume of boxes and enclosures . 45
13 Resistance to ageing, protection against ingress of solid objects and against
harmful ingress of water . 46
13.1 Resistance to ageing . 46
13.2 Protection against the ingress of solid objects . 48
13.3 Protection against harmful ingress of water . 49
14 Insulation resistance and electric strength . 55
15 Mechanical strength . 56
15.1 General . 56
15.2 Impact test at low temperature . 57
15.3 Compression test . 59
15.4 Impact test for boxes and enclosures . 60
15.5 Compression test for enclosures made of natural or synthetic rubber or a
mixture of both . 65
15.6 Test for boxes and enclosures declared with IK code . 67
16 Resistance to heat . 67
16.1 Parts of insulating material necessary to retain current-carrying parts . 67
16.2 Parts of insulating material not necessary to retain current-carrying parts . 68
16.3 Boxes and enclosures of insulating materials classified according to 7.2.2.2
or 7.2.2.3 . 68
16.3.1 Mechanical strength. 68
16.3.2 Parts of insulating material necessary to retain parts of the earthing
circuit . 69
17 Creepage distances, clearances and distances through sealing compound . 69
18 Resistance of insulating material to abnormal heat and fire . 70
19 Resistance to tracking . 71
20 Resistance to corrosion . 72
21 Electromagnetic compatibility (EMC) . 72
Annex A (informative) Examples of enclosures and parts thereof . 73
Annex B (normative) Test for boxes and enclosures declared with IK code . 74
Bibliography . 75

Figure 1 – Examples of membranes and grommets . 12
Figure 2 – Test piston dimensions. 18
Figure 3 – Demonstration of the non-penetration of the internal volume . 19
Figure 4 – Earthing strap . 21
Figure 5 – Test strap . 21
Figure 6 – Arrangement for test on covers or cover-plates (see 12.2.3.2 and 12.2.3.3) . 25
Figure 7 – Gauge for the verification of the outline of lids, covers or cover-plates . 27

– 4 – IEC 60670-1:2024 RLV © IEC 2024
Figure 8 – Examples of application of the gauge of Figure 7 on covers fixed without
screws on a mounting surface or supporting surface . 28
Figure 9 – Compliance criteria of application of the gauge of Figure 7 . 29
Figure 10 – Gauge for verification of grooves, holes and reverse tapers . 30
Figure 11 – Sketch showing the direction of application of the gauge of Figure 10 . 31
Figure 12 – Apparatus for testing the cable anchorage . 34
Figure 13 – Example of mounting block for boxes to be embedded in masonry (flush

type and semi-flush type) . 39
Figure 14 – Example of the fixing of the auxiliary device mounted on a specimen . 39
Figure 15 – Example of test apparatus for the test . 40
Figure 16 – Verification of fixing means for boxes and enclosures classified according
to 7.2.2.1 . 41
Figure 17 – Test of the force and measurement of the displacement . 43
Figure 18 – Volume measurement. 46
Figure 19 – Reference surfaces for boxes and enclosures . 50
Figure 20 – Test wall . 52
Figure 21 – Example of the protected volume . 54
Figure 22 – Apparatus for impact test at low temperature. 59
Figure 23 – Mounting block for flush-type boxes and enclosures in order to apply
blows on the rear surface . 61
Figure 24 – Sequence of blows for parts A, B, C, D, E, F and G . 64
Figure 25 – Test devices for load compression test for enclosures made of natural or
synthetic rubber or a mixture of both . 67
Figure 26 – Rigid crossbar . 69
Figure 27 – Diagrammatic representation of the glow-wire test . 71
Figure A.1 – Examples of enclosures and parts thereof. 73

Table 1 – Classification of boxes and enclosures . 15
Table 2 – Forces to be applied to lids, covers, cover-plates or actuating members
whose fixing is not dependent on screws . 24
Table 3 – Forces and torques to be applied to cable anchorages . 33
Table 4 – Tightening torques for the verification of the mechanical strength of screws . 37
Table 5 – Torque test values for cable glands . 44
Table 6 – Test voltage for electric strength test . 56
Table 7 – Determination of parts A, B, C, D E, F and G . 61
Table 8 – Height of fall for impact test . 62

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES FOR
HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIONS –

Part 1: General requirements
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 60670-1:2015. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
– 6 – IEC 60670-1:2024 RLV © IEC 2024
IEC 60670-1 has been prepared by subcommittee 23B: Plugs, socket-outlets and switches, of
IEC technical committee 23: Electrical accessories. It is an International Standard.
This third edition cancels and replaces the second edition published in 2015. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the classifications, markings and tests of boxes and enclosures for use and installation in
ambient temperature below normal use are modified;
b) the test for the durability of markings is modified;
c) a test is added for fixing screws protected by caps;
d) a normative annex is added to specify the tests applied to boxes and enclosures declared
with an IK code;
e) requirements for the resistance to abnormal heat and fire of internal parts not necessary to
retain current carrying parts are specified.
The text of this International Standard is based on the following documents:
Draft Report on voting
23B/1533/FDIS 23B/1551/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.
In this publication the following print types are used:
• requirements proper: in roman type.
• test specifications: in italic type.
• notes: in smaller roman type.
A list of all parts in the IEC 60670 series, published under the general title Boxes and enclosures
for electrical accessories for household and similar fixed installations, 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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
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.

– 8 – IEC 60670-1:2024 RLV © IEC 2024
BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES FOR
HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIONS –

Part 1: General requirements
1 Scope
This part of IEC 60670 applies to boxes, enclosures and parts of enclosures (hereafter called
"boxes" and "enclosures") for electrical accessories with a rated voltage not exceeding
1 000 V AC and 1 500 V DC intended for household or similar fixed electrical installations,
either indoors or outdoors.
Boxes and enclosures complying with this document are suitable for use at ambient
temperatures not normally exceeding +40 °C, but their average over a period of 24 h does not
exceed +35 °C, with a lower limit of the ambient air temperature of −5 °C.
During the installation the temperature may be outside the above temperature range according
to the classification of the boxes and the enclosures.
Other temperatures outside the above range can apply according to the classification of the
boxes and the enclosures.
This document is intended to apply to boxes and enclosures for electrical accessories within
the scope of IEC technical committee 23.
This standard may be used as a reference document for other IEC technical committees and
subcommittees.
A box or an enclosure which is an integral part of an electrical accessory and provides protection
for that accessory against external influences (for example mechanical impact, ingress of solid
objects or water, etc.) is covered by the relevant standard for such an accessory.
This document gives test requirements for boxes and enclosures declared with IK code, see
Annex B (normative).
This document also applies to types of boxes and enclosures as modified in IEC 60670-21,
IEC 60670-22, IEC 60670-23, and IEC 60670-24.
This document does not apply to:
– ceiling roses;
– luminaire supporting couplers;
– boxes, enclosures and parts of enclosures specifically designed to be used for cable
trunking and ducting systems complying with IEC 61084 and which are not intended to be
installed outside of these systems.
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 60068-2-75:1997 2014, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60112:20032020, Method for the determination of the proof and the comparative tracking
indices of solid insulating materials
IEC 60417, Graphical symbols for use on equipment, available at http://www.graphical-
symbols.info/equipment
IEC 60423:2007, Conduit systems for cable management – Outside diameters of conduits for
electrical installations and threads for conduits and fittings
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60695-2-11:2000 2021, Fire hazard testing – Part 2-11: Glowing/hot-wire based test
methods – Glow-wire flammability test method for end-products
IEC 60695-10-2:2003 2014, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test
IEC 60981:20042019, Extra-heavy duty rigid steel conduits
IEC 61032:1997, Protection of persons and equipment by enclosures – Probes for verification
IEC 61140:20012016, Protection against electric shock – Common aspects for installation and
equipment
IEC 61140:2001/AMD1:2004, Protection against electric shock – Common aspects for
installation and equipment
IEC 62262:2002, Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62262:2002/AMD1:2021
ISO/IEC Guide 51, Safety aspects – Guidelines for their inclusion in standards
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

First edition. This edition has been replaced in 2014 by IEC 60068-2-75:2014, Environmental testing – Part 2-75:
Tests – Test Eh: Hammer tests
First edition. This edition has been replaced in 2014 by IEC 60695-2-11:2014, Fire hazard testing – Part 2-11:
Glowing/hot-wire based test methods – Glow-wire flammability test method for end-products (GWEPT)
Second edition. This edition has been replaced in 2014 by IEC 60695-10-2:2014, Fire hazard testing – Part 10-
2: Abnormal heat – Ball pressure test method

– 10 – IEC 60670-1:2024 RLV © IEC 2024
3.1
enclosure
combination of parts, such as boxes, backplates, covers, cover-plates, lids, box extensions,
accessories, etc., providing after assembly and installation as in normal use, an appropriate
protection against external influences, and a defined protection against contact with enclosed
live parts from any accessible direction
Note 1 to entry: See Annex A.
3.2
box
part of an enclosure provided with means for fixing a cover, cover-plate, accessory, etc., and
intended to receive accessories (such as socket-outlets, switches, etc.)
Note 1 to entry: The accessory can be entirely or partly inside the enclosure.
3.3
box extension
part of an enclosure which is intended to extend a box for the purpose of either increasing the
internal volume of the box or enclosure or to adjust for mounting the box flush or semi-flush
with the finished surface of a wall or the like
3.4
backplate
part of a surface mounting enclosure provided with means for fixing a cover, cover-plate,
accessory (such as socket-outlets, switches, etc)
3.5
lid
cover
cover-plate
part of an enclosure, not integral with or part of an accessory, which may either retain an
accessory in position or enclose it
3.6
raised cover
cover intended for mounting directly onto a box to provide for the attachment of accessories
and to increase the internal volume of the enclosure
Note 1 to entry: The centre portion of the cover is raised to accommodate a specific wall or ceiling thickness and
to permit the mounting of the accessory on it, flush with the surface of the wall or ceiling.
3.7
exposed conductive part
conductive part of electrical equipment, which can be touched, and which is not normally live,
but which can become live when basic insulation fails
3.8
surface mounting enclosure
surface mounting box
box or enclosure which is intended for mounting on a surface
Note 1 to entry: See Annex A.
3.9
flush-mounting box
flush-mounting enclosure
box or enclosure which is intended for mounting flush with the surface
Note 1 to entry: See Annex A.
3.10
semi-flush mounting box
semi-flush mounting enclosure
box or enclosure which is intended to fit within a mounting surface and partially projects from
the mounting surface
3.11
cable gland
device designed to permit the entry of a cable, flexible cable or insulated conductor into an
enclosure, and which provides sealing and retention and eventually may also provide other
functions such as earthing, bonding, insulation, cable guarding, strain relief or a combination of
these
3.12
seal
material used to fill up the space between the inside of a gland and the cable passing through,
usually compressed by the gland and thereby forming a joint
3.13
gasket
hen under compression
material introduced between mating surfaces of an enclosure which in w
forms a joint
3.14
grommet
component used to support and protect the cable or conduit at the point of entry; it may also
prevent the ingress of moisture or contaminants
Note 1 to entry: See Figure 1.
[SOURCE: IEC 60050-581:2008, 581-27-19, modified – The words "part of", "or an accessory"
and "wires or" have been omitted from the definition and "or conduit" added; Note 1 to entry
added.]
– 12 – IEC 60670-1:2024 RLV © IEC 2024
IEC
Key
1 box
2 entry membrane
3 enclosure
4 protective membrane
5 grommet
Key
1 box
2 entry membrane
3 enclosure
4 protective membrane
5 grommet
6 electrical accessory
Figure 1 – Examples of membranes and grommets

3.15
entry membrane
component or an integral part of an enclosure used to protect the cable which may be used to
support the cable or conduit at the point of entry
Note 1 to entry: An entry membrane may also prevent the ingress of moisture or contaminants and may be part of
a grommet (see Figure 1).
3.16
protecting protective membrane
component or an integral part of an enclosure that is not intended to be penetrated in normal
use and is intended to provide protection against ingress of water or solid objects and/or to
allow the operation of an accessory
Note 1 to entry: See Figure 1.
3.17
composite material
combination of metal and insulating material
3.18
spout
hub
open entry of a box permitting the insertion and containment of a conduit
3.19
cable retention
ability to limit the displacement of a fitted cable against pull forces
3.20
cable anchorage
ability to limit the displacement of a fitted flexible cable against pull and push forces and torques
3.21
blanking-plug
component used to close an open inlet or an open knock-out
3.22
U
n
rated voltage
voltage assigned by the manufacturer for a specific operating condition of the box or enclosure
[SOURCE: IEC 60050-442:1998, 442-01-03, modified – The symbol has been added as a term,
the domain "(of accessories)" has been deleted; in the definition, "accessory" has been replaced
with "box or enclosure".]
4 General requirements
Boxes and enclosures shall be so designed and constructed that, in normal use, their
performance is reliable, and safety is achieved by reducing risk to a tolerable level, as defined
in ISO/IEC Guide 51.
Compliance is checked by meeting all the relevant requirements and tests specified.

– 14 – IEC 60670-1:2024 RLV © IEC 2024
5 General notes remarks on tests
5.1 Test conditions and number of samples
Tests according to this document are type tests.
Unless otherwise specified in this document, boxes and enclosures are tested as delivered.
Accessories complying with other standards are not tested again.
Tests on boxes and enclosures of insulating material shall be performed after a preconditioning
period of at least 10 days 48 h at ambient temperature between +15 °C and +35 °C and relative
air humidity between 45 % and 85 %.
NOTE For some materials a longer preconditioning period can be requested by the manufacturer.
Unless otherwise specified, the tests are carried out in the order of the clauses, at an ambient
temperature between +15 °C and +35 °C on a set of three specimens.
In case of doubt, the tests are made at an ambient temperature of +(20 ± 5) °C on a set of three
new specimens.
It is recommended that the tests are carried out at an ambient temperature of (20 ± 5) °C.
5.2 Compliance general requirement
The specimens are submitted to all the relevant tests and the requirements are satisfied if all
the applicable tests are met deemed to have been passed.
If one of the specimens does not satisfy a test due to an assembly or a manufacturing fault,
that test and any preceding ones which may have influenced the results of the test shall be
repeated and also the tests which follow shall be carried out in the required sequence on
another full set of specimens, all of which shall comply with the requirements.
NOTE When submitting the first set of specimens, the applicant can also submit the additional set of specimens
which may can be necessary, if one specimen fails. The testing station will then, without further request, test the
additional set of specimens and will only reject if a further failure occurs. If the additional set of specimens is not
submitted at the same time, the failure of one specimen will entail rejection.
In this document the term "instructions" is understood to mean manufacturer's instructions.
6 Ratings
See the relevant part of Parts 21 to 24 of the IEC 60670 series.
This Clause 6 is only applicable for the purposes of the following relevant International
Standards: IEC 60670-21, or IEC 60670-22, or IEC 60670-23, or IEC 60670-24.

7 Classification
Boxes and enclosures are classified according to Table 1. (All classification references used in
this document, directly refer to this table).
Table 1 – Classification of boxes and enclosures
Classification criteria
7.1 The nature of their material 7.1.1 Insulating
7.1.2 Metallic
7.1.3 Composite
7.1.4 Natural or synthetic rubber
or a mixture of both
7.2 The type of installation 7.2.1 Flush, semi-flush in solid 7.2.1.1 Not suitable for
walls, ceilings or floors installation into concrete
7.2.1.2 Suitable for installation
into concrete with a maximum
temperature during the casting
process of +60 °C
7.2.1.3 Suitable for installation
into concrete with a maximum
temperature during the casting
process of +90 °C
7.2.2 Flush or semi-flush in hollow 7.2.2.1 Class Ha
walls, hollow ceilings, hollow floors
or furniture
7.2.2.2 Class Hb for walls
7.2.2.3 Class Hb for ceilings
7.2.3 Surface mounting on walls,

ceilings, floors or furniture
a
7.3.1 With inlets for sheathed
7.3 The type(s) of inlets (outlets)
cables for fixed installations
7.3.2 With inlets for flexible cables
7.3.3 With inlets for plain or
corrugated conduits
7.3.4 With inlets for threaded
conduits
7.3.5 With inlets for other types of
conductors/cables or conduits
7.3.6 With spouts (hubs)
7.3.7 Without inlets. Inlet openings
will be made during installation
7.4 The clamping means 7.4.1 With cable retention
7.4.2 With cable anchorage
7.4.3 With clamping means for
flexible conduit
7.4.4 Without clamping means
– 16 – IEC 60670-1:2024 RLV © IEC 2024
Classification criteria
7.5 The minimum temperature 7.5.1 −5 °C
during installation and use.
7.5.2 −15 °C
7.5.3 −25 °C
7.5.4
−25 °C during installation,
−25 °C to −40 °C during use, as
declared.
7.6 The degree of protection against access to hazardous parts and against harmful effects due to the ingress
of solid foreign objects according to IEC 60529 with a minimum degree of IP 2X
7.7 The degree of protection against harmful effects due to the ingress of water according to IEC 60529
7.8 The degree of protection of 7.8.1 IP2X
the part mounted inside the hollow
7.8.2 > IP2X
walls of the boxes classified
according to 7.2.2.1
7.9 The provision for fixing 7.9.1 Boxes supplied with screws
accessories to boxes
7.9.2 Boxes intended to receive
screws
7.9.3 Boxes intended to receive
claws
7.9.4 Boxes intended to receive
other means
a
Boxes and enclosures may have more than one type of inlet.
Owing to installation rules, boxes class Hb for walls and class Hb for ceilings have some specific additional
requirements and are tested according to 11.2, 12.13, 16.3.
NOTE In the following countries only class Ha boxes and enclosures are used: BE, BR, CH, DE, FR, IT, JP, NL,
NO, PT, SE, UK.
8 Marking
8.1 General
Boxes and enclosures shall be marked with
a) the name, trade mark or identification mark of the manufacturer or the responsible vendor.
In addition, enclosures shall be marked with:
b) the first characteristic numeral for the degree of protection against access to hazardous
parts and against harmful effects due to ingress of solid foreign objects, if declared to be
higher than 4, in which case the second characteristic numeral shall also be marked;
c) the second characteristic numeral for the degree of protection against harmful effects due
to ingress of water, if declared to be higher than 2, in which case the first characteristic
numeral shall also be marked;
IPXX
d) the following marking (IEC 60417-6345:2015-07) on the cover of flush enclosures

intended to be mounted on rough surfaces and where the IP is dependent on the surface
(see Figure 5 Figure 20);
The IP code, if applicable, shall be marked on the outside of the enclosure so as to be easily
discernible when the enclosure is mounted and wired as for normal use.
e) the type reference, which may be a catalogue number;
NOTE 1 In the following country the marking of the type reference is not used: UK.
f) for boxes and enclosures classified as in 7.2.2.2 and 7.2.2.3, the minimum internal volume
in cm as determined by the test in 12.16. The internal volume shall be marked on the inside
of the box or enclosure. The marking on a box or enclosure shall be such that the value can
be read after installation of the box in the normal manner but before the installation of the
wiring devices and wiring.
The following information shall be marked on the boxes and enclosures or provided by the
manufacturer on the smallest package unit or in the manufacturer’s instructions which need are
not required to be provided with the product:
g) +90 °C for boxes and enclosures classified according to 7.2.1.3;
h) the necessary information concerning the openings which can be made during installation
in the case of boxes and enclosures classified according to 7.3.7;
i) the minimum temperature during installation for boxes classified according to 7.5.2
and 7.5.3;
i) symbol IEC 60417-6292:2015-11 for boxes and enclosures classified according to
7.5.2, 7.5.3 and 7.5.4.
The symbol shall indicate the declared minimum temperature of installation and use for
boxes and enclosures classified according to 7.5.2 or 7.5.3 or the declared minimum
temperature of use for boxes and enclosures classified according to 7.5.4.
For products according to 7.5.4 the instructions shall specify that the products are for
installation down to −25 °C and for use down to the temperature value as declared by the
manufacturer. The declared value shall be a multiple of 5 °C.
j) the symbol Ha for boxes classified according to 7.2.2.1 and the symbol Hb for boxes
classified according to 7.2.2.2 and 7.2.2.3.
NOTE 2 In the following country, symbol for boxes classified according to 7.2.2.1 is not used: JP
k) IK code, if declared.
Unless self-evident, further information for the correct use of the enclosure shall be given in the
manufacturer’s instructions which need are not required to be provided with the product.
In special cases, in order to achieve a higher degree of protection by the use of special parts
an instruction sheet, instructions should be provided and should indicate the higher degree of
protection. In such a case, the marking covers the initial degree of protection.
8.2 Durability of the marking on the boxes and enclosures
The marking on the boxes and enclosures shall be durable and easily legible.
Compliance with 8.1 and 8.2 is checked by inspection and by the following test.
The test is made by rubbing the marking by hand for 15 s with a piece of cloth soaked with
water and again for 15 s with a piece of cloth soaked with petroleum spirit.
NOTE Marking made by moulding, pressing or engraving is considered durable and is therefore not subjected to
this t
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