IEC 60670-21:2024
(Main)Boxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 21: Particular requirements for boxes and enclosures with provision for suspension means
Boxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 21: Particular requirements for boxes and enclosures with provision for suspension means
IEC 60670-21:2024 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. Other temperatures outside the above range can apply according to the classification of the boxes and the enclosures. This document applies to boxes and enclosures for ceiling and wall mounting with provision for suspension means. This second edition cancels and replaces the first edition published in 2004 and Amendment 1:2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Complete revision of the tests and requirements of the suspension means.
Boîtes et enveloppes pour appareillage électrique pour installations électriques fixes pour usages domestiques et analogues - Partie 21: Règles particulières concernant les boîtes et enveloppes avec dispositifs de suspension
L'IEC 60670-21:2024 s'applique aux boîtes, enveloppes et parties d'enveloppes (ci-après désignées par les termes "boîtes" et "enveloppes") pour appareillages électriques dont la tension assignée ne dépasse pas 1 000 V en courant alternatif et 1 500 V en courant continu pour installations électriques fixes pour usages domestiques et analogues, en intérieur ou en extérieur. Les boîtes et enveloppes conformes au présent document sont adaptés à un usage à des températures ambiantes qui ne dépassent pas habituellement +40 °C, mais dont la moyenne sur une période de 24 h ne dépasse pas +35 °C, avec une limite basse de la température ambiante de −5 °C. D'autres températures situées en dehors de la plage ci-dessus peuvent s'appliquer selon la classification des boîtes et enveloppes. Le présent document s'applique aux boîtes et enveloppes pour plafonds et murs, avec des dispositions pour dispositifs de suspension. Cette deuxième édition annule et remplace la première édition parue en 2004 et son Amendement 1:2016. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) les essais et exigences pour les dispositifs de suspension ont fait l'objet d'une révision complète.
La version française de la norme n'a pas été soumise au vote.
General Information
Relations
Overview
IEC 60670-21:2024 is Part 21 of the IEC 60670 series and specifies particular requirements for boxes and enclosures with provision for suspension means used in household and similar fixed electrical installations. It applies to boxes and enclosures (and parts thereof) for electrical accessories with a rated voltage up to 1 000 V AC and 1 500 V DC, intended for indoor or outdoor ceiling and wall mounting. The edition replaces IEC 60670-21:2004 + Amendment 1:2016 and includes a complete technical revision of tests and requirements for suspension means.
Key topics and technical requirements
- Scope and environmental limits: Designed for ambient temperatures normally not exceeding +40 °C (24 h average ≤ +35 °C) and not below −5 °C, with alternative temperature classifications allowed where declared.
- Provision for suspension means: Defines what constitutes a box with suspension means and what suspension means are (hooks, brackets, etc.). Covers whether suspension means are supplied with the box or separately.
- Classification: Includes classes for boxes intended to support luminaires and ceiling fans (specific classifications referenced to IEC 60670-1:2024).
- Marking and labelling: Requires clear marking such as maximum supported mass (kg) for boxes intended for luminaire support, and additional marking rules where declared test forces exceed thresholds (country-specific notes for US and Denmark).
- Mechanical strength and tests: Strength, ageing, ingress protection, insulation, electrical clearances and creeping distances are addressed. This edition significantly revises tests and verification procedures for suspension means and mechanical support.
- Protection and earthing: Conductive parts of suspension means inside enclosures must be insulated, placed to avoid contact with live parts, or reliably earthed per the standard.
- Minimum supported mass: Unless declared otherwise, boxes with provision for suspension means shall support at least 5 kg (reference to IEC 60364-5-55 for luminaire fixing).
Practical applications and users
IEC 60670-21:2024 is essential for:
- Manufacturers of electrical enclosures, ceiling and wall boxes, suspension brackets and accessories
- Product designers and R&D teams developing fixtures for luminaires and ceiling fans
- Test laboratories and conformity assessors performing mechanical and electrical tests
- Specifiers, electrical contractors and installers ensuring correct selection and safe mounting
- Regulatory bodies and certification agencies that reference IEC standards for compliance
Related standards
- IEC 60670-1:2024 (use in conjunction with Part 21)
- IEC 60364 series (installation rules, referenced for luminaire fixing)
Keywords: IEC 60670-21:2024, boxes and enclosures, suspension means, electrical accessories, household installations, luminaire support, ceiling mounting, mechanical strength tests, marking, earthing, IEC 60670-1.
Standards Content (Sample)
IEC 60670-21 ®
Edition 2.0 2024-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Boxes and enclosures for electrical accessories for household and similar fixed
electrical installations –
Part 21: Particular requirements for boxes and enclosures with provision for
suspension means
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IEC 60670-21 ®
Edition 2.0 2024-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Boxes and enclosures for electrical accessories for household and similar fixed
electrical installations –
Part 21: Particular requirements for boxes and enclosures with provision for
suspension means
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.99 ISBN 978-2-8327-0111-9
– 2 – IEC 60670-21:2024 RLV © IEC 2024
CONTENTS
FOREWORD . 3
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 7
5 General notes remarks on tests . 7
6 Ratings . 7
7 Classification . 8
8 Marking . 8
9 Dimensions. 8
10 Protection against electric shock . 8
11 Provision for earthing . 9
12 Construction . 9
13 Resistance to ageing, protection against ingress of solid objects and against
harmful ingress of water . 9
14 Insulation resistance and electric strength . 9
15 Mechanical strength . 9
16 Resistance to heat . 13
17 Creepage distances, clearances and distances through sealing compound . 14
18 Resistance of insulating material to abnormal heat and to fire . 14
19 Resistance to tracking . 14
20 Resistance to corrosion . 14
21 Electromagnetic compatibility (EMC) . 14
Figure 101 – Examples of suspension means . 7
Figure 102 – Examples of boxes and enclosures with provision for suspension means . 10
Figure 103 – Verification of suspension means intended to be used on a wall . 12
Figure 104 – Inclined ceiling test. 13
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES FOR
HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIONS –
Part 21: Particular requirements for boxes and
enclosures with provision for suspension means
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) 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 60670-21:2004+AMD1:2016 CSV. A vertical bar appears
in the margin wherever a change has been made. Additions are in green text, deletions
are in strikethrough red text.
– 4 – IEC 60670-21:2024 RLV © IEC 2024
IEC 60670-21 has been prepared by subcommittee 23B: Plugs, socket-outlets and switches, of
IEC technical committee 23: Electrical accessories. It is an International Standard.
This second edition cancels and replaces the first edition published in 2004 and
Amendment 1:2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Complete revision of the tests and requirements of the suspension means.
The text of this International Standard is based on the following documents:
Draft Report on voting
23B/1534/FDIS 23B/1552/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.
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.
This document is to be used in conjunction with IEC 60670-1:2024. It lists the changes
necessary to convert that standard into a specific standard for housing protective devices and
other power dissipating electrical equipment.
Where this document states "addition", "modification" or "replacement", the relevant
requirement, test specifications or explanatory matter in IEC 60670-1:2024 shall be adapted
accordingly.
Clauses and subclauses, notes, figures or tables which are additional to those in
IEC 60670-1:2024 are numbered starting from 101.
Additional annexes to IEC 60670-1:2024 are numbered AA, BB, etc.
In this publication the following print types are used:
• requirements proper: in roman type.
• test specifications: in italic type.
• notes: in smaller roman type.
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.
– 6 – IEC 60670-21:2024 RLV © IEC 2024
BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES FOR
HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIONS –
Part 21: Particular requirements for boxes and
enclosures with provision for suspension means
1 Scope
Clause 1 of IEC 60670-1:2024 is applicable with the following modification:
Addition after the fourth third paragraph:
This document applies to boxes and enclosures for ceiling and wall mounting with provision for
suspension means.
2 Normative references
Clause 2 of IEC 60670-1:2024 is applicable.
3 Terms and definitions
Clause 3 of IEC 60670-1:2024 is applicable with the following modification:
Addition:
3.101
box with provision for suspension means
box intended to be used for suspending and supporting mechanical loads and which accepts
the suspension means
3.102
suspension means
means comprising any necessary components (hooks, brackets, etc.) which may be delivered
with the box and enclosure or supplied separately (see Figure 101)
Note 1 to entry: Examples of suspension means are shown in Figure 101.
a) Box provided with provision for suspension means
b) Suspension means
c) Box and enclosure delivered with suspension means
Figure 101 – Examples of suspension means
4 General requirements
Clause 4 of IEC 60670-1:2024 is applicable.
5 General notes remarks on tests
Clause 5 of IEC 60670-1:2024 is applicable.
6 Ratings
Void.
– 8 – IEC 60670-21:2024 RLV © IEC 2024
7 Classification
Clause 7 of IEC 60670-1:2024 is applicable with the following modification:
Addition to Table 1:
b
aa
7.101.1 For suspension of supporting a
7.101 The provision for suspension means
luminaire.
7.101.2 For suspension of supporting a ceiling
fan.
b
aa
The suspension means may be provided with the box or not.
8 Marking
Clause 8 of IEC 60670-1:2024 is applicable with the following modification:
8.1 General
Addition after item j):
k) the mass in kg, if the test force declared by the manufacturer is greater than 250 N for boxes
and enclosures classified according to 7.101.1.
NOTE 1 In the following countries boxes for luminaire support are marked "For luminaire support". Where boxes
are intended to support a mass greater than 15,8 kg, the mass is to be marked: US.
NOTE 2 In Denmark shall the marking in kg reflect a safety factor of 5 times.
Addition after item k):
l) for boxes and enclosures classified according to 7.101.1, the maximum supported mass in
kilograms declared by the manufacturer.
NOTE 101 In the following countries boxes for luminaire support are marked "For luminaire support". Where boxes
are intended to support a mass greater than 15,8 kg, the mass is to be marked: US.
NOTE 102 In the following country the marking in kilograms shall reflect a safety factor of 5 times: DK.
9 Dimensions
Clause 9 of IEC 60670-1:2024 is applicable.
10 Protection against electric shock
Clause 10 of IEC 60670-1:2024 is applicable with the following modification:
Addition:
Conductive parts of suspension means inside the box or enclosure shall be:
– protected by a layer of insulating material which complies with the tests for insulating linings,
or
– located such that it will not come in contact with electrical conductors or live parts, or
– reliably connected to the earthing means complying with requirements of 11.1 when fitted
as for normal use.
11 Provision for earthing
Clause 11 of IEC 60670-1:2024 is applicable.
12 Construction
Clause 12 of IEC 60670-1:2024 is applicable with the following modification:
Addition:
12.101 Provision for suspension means
Unless otherwise declared by the manufacturer, screws for fixing accessories and/or covers are
not considered as provision for suspension means.
12.102 Minimum mass to be supported by suspension means
Boxes and enclosures with provision for suspension means shall be able to support a mass of
at least 5 kg.
NOTE For fixing means of a luminaire, a minimum supported mass of 5 kg is given in IEC 60364-5-55:2011, 559.5.2.
Compliance is checked by the tests of 15.101.
13 Resistance to ageing, protection against ingress of solid objects and against
harmful ingress of water
Clause 13 of IEC 60670-1:2024 is applicable.
14 Insulation resistance and electric strength
Clause 14 of IEC 60670-1:2024 is applicable.
15 Mechanical strength
Clause 15 of IEC 60670-1:2024 is applicable with the following modification:
Addition:
1.10115.101 Boxes and enclosures with provision for suspension means
15.101.1 Boxes and enclosures with provision for suspension means shall withstand the
thermal and mechanical stresses occurring in normal use.
Boxes and enclosures with provision for suspension means according to:
– 7.101.1 shall comply with the requirements of 15.101.12 and 15.101.23;
– 7.101.2 shall comply with the requirements of 15.101.34.
Examples of boxes and enclosures with provision for suspension means are shown in
Figure 102.
– 10 – IEC 60670-21:2024 RLV © IEC 2024
a) Boxes and enclosures which are intended for suspension of loads from a ceiling.
b) Boxes and enclosures which are intended for suspension of loads from a wall
c) Boxes and enclosures which are intended to support a ceiling fan
Key
1 ceiling
2 wall
3 box
4 suspension mean
5 ceiling fan
Figure 102 – Examples of boxes and enclosures with provision for suspension means
15.101.12 Boxes and enclosures which are intended for suspension of loads from a ceiling
shall withstand a test force of 250 N or a higher test force Y X corresponding to five times the
maximum supported mass in kilograms declared by the manufacturer.
The test force F in newtons is the result of the maximum supported mass in kilograms multiplied
by the gravity and multiplied by a safety factor of 5; this value is rounded up to the next decimal,
for example: 5 kg × 9,81 m/s × 5 ≈ 245, gives a test force of 250 N.
NOTE 1 101 In the following countries there is no requirement for all boxes and enclosures for suspension means
to withstand 250 N and no requirement for non-metallic boxes and enclosures to withstand 90° C: UK.
NOTE 2102 In the following country, the test force Y shall correspond to 5 times the marking in kilograms as required
in item k) of 8.1: DK
NOTE 3103 In Spain, there are no requirements for all boxes and enclosures for suspension means to withstand
90 °C.
Compliance is checked by the following test.
The specimen is fitted with a suspension means and installed as for normal use according to
the manufacturer's instructions, any screw being tightened to two-thirds of the torque given in
the relevant column of Table 4.
Greater values of torque may be used if so declared by the manufacturer, when the relevant
information is provided.
The suspension means is then loaded with a weight of (250 ± 5) N or with a weight (Y ± 2 %) N
declared by the manufacturer, whichever is the higher, for 24 h.
For boxes and enclosures according to 7.1.1 and 7.1.3 the test is performed in a heating cabinet
at (90 ± 2)°C.
For boxes and enclosures according to 7.1.2 and 7.1.4 the test is performed at ambient
temperature.
A test force of (250 ± 5) N, or of (X ± 2 %) N, is applied to the suspension means for 24 h at
ambient temperature.
For boxes and enclosures according to 7.1.1 and 7.1.3 the test is repeated in a heating cabinet
at (90 ± 2) °C for 1 h with a test force of (50 ± 1) N, or a higher test force corresponding to the
mass declared by the manufacturer without considering the safety factor.
NOTE 4104 In the following country the test of this Subclause 15.101.2 shall be carried out at (80 ± 2) °C instead
of (90 ± 2) °C: NL.
During the test, the box and the enclosure or the suspension means shall not become detached
and the specimen shall show no damage which leads to non-compliance with this document.
15.101.23 Boxes and enclosures which are intended to be used in or on for suspension of
loads from a wall shall withstand a test force of 100 N or a higher test force Y corresponding to
two times the maximum supported mass in kilograms declared by the manufacturer.
NOTE 1 This means may be screws otherwise intended for fixing a part of the box, for example the cover or cover
plate.
NOTE 2 In the following countries there is no requirement for all suspension means to withstand 100 N: UK.
Compliance is checked by inspection and by the following test.
The box or the enclosure including covers and cover plates (if any) shall be installed as for
normal use according to the manufacturer's instructions and shall be placed in a heating
cabinet, any screw being tightened to two-thirds of the torque given in the relevant column of
Table 4.
A force, equally distributed between each means if more than one, of (100 ± 5) N or of (Y ± 2 %)
N declared by the manufacturer, is then applied for 24 h at (40 ± 2)°C perpendicularly to the
wall.
A force, equally distributed between each means if more than one, of (100 ± 2) N or of
(Y ± 2 %) N is then applied for 24 h at (40 ± 2) °C downward at a distance not exceeding 5 mm
protruding from the plane formed by the mounting surface of the luminaire as shown in
Figure 103.
– 12 – IEC 60670-21:2024 RLV © IEC 2024
Key
1 test specimen
2 sheet of plywood
3 lever
4 main axis of the box
Figure 103 – Verification of suspension means intended to be used on a wall
During the test, the box or enclosure or the suspension means shall not become detached and
the specimen shall show no damage which leads to non-compliance with this document.
15.101.34 Boxes and enclosures which are intended to support a ceiling fan shall withstand
the thermal and mechanical stress occurring in normal use.
During the test the box or enclosure or its supporting means shall not be pulled loose from the
test structure when subjected to the following tests.
One specimen shall be tested in each of the horizontal and inclined positions.
A specimen shall be mounted in accordance with the manufacturer’s instructions to a supporting
test structure so as to be tested while both in a horizontal position and inclined 30° from the
horizontal with the mounting screws perpendicular to the ceiling and the fan blades parallel to
the floor (see Figure 102 Figure 104).
Dimensions in millimetres
Key
1 Box
2 Ceiling
Figure 104 – Inclined ceiling test
A test fan having four blades with a diameter of (1 320 ± 25) mm, weighing or ballasted to a
weight of (155 ± 5) N (corresponding to a mass of (15,8 ± 0,5) kg) or the rated load Y declared
by the manufacturer, whichever is higher, shall be used for the tests. A 0,392 N (corresponding
to a mass of 40 g) imbalance shall be placed at the centre of gravity of one blade, measured
independently from the test fan.
The test fan shall be provided with a downrod of rigid metal pipe of a length sufficient to position
the lower end of the fan blades (305 ± 25) mm below the surface of the ceiling after mounting.
The downrod shall be welded at the upper end to a 7,9 mm thick fan mounting bracket.
The test fan mounting bracket shall be secured to the box or enclosure in accordance with the
manufacturer's instructions. Screws or nuts shall be tightened with a torque given in the relevant
column in Table 4. A universal type joint mounting construction shall not be used for the test.
The fan motor shall be such that the speed can be controlled.
The speed of the test fan shall be adjusted to maintain a blade tip speed of 1 220 m/min
(294 r/min).
The blade pitch shall be reduced to a minimum. The fan shall operate continuously at the
+1
prescribed speed for (24 ) h.
At the end of the 24 h, one of the cover retaining screws or nuts shall be loosened two full turns
and the fan shall operate as specified for an additional 24 h for each mounting condition,
horizontal and inclined. This additional test is not required for constructions that employ cover
retaining or fan mounting screws with captive, locking type washers or locknuts.
Additionally, there shall be no stripping of threads, cracking, crazing, breaking, or visible
damage to the box or enclosure or its supporting means (other than bending).
16 Resistance to heat
Clause 16 of IEC 60670-1:2024 is applicable.
– 14 – IEC 60670-21:2024 RLV © IEC 2024
17 Creepage distances, clearances and distances through sealing compound
Void.
18 Resistance of insulating material to abnormal heat and to fire
Clause 18 of IEC 60670-1:2024 is applicable.
19 Resistance to tracking
Clause 19 of IEC 60670-1:2024 is applicable.
20 Resistance to corrosion
Clause 20 of IEC 60670-1:2024 is applicable.
21 Electromagnetic compatibility (EMC)
Clause 21 of IEC 60670-1:2024 is applicable.
a) Box provided with provision for suspension means
Example of provision for suspension means
IEC 433/04
b) Suspension means
IEC 434/04
c) Box and enclosure delivered with suspension means
IEC 435/04
Figure 101 – Examples of suspension means
– 16 – IEC 60670-21:2024 RLV © IEC 2024
330 mm
30°
IEC 436/04
Key
1 Box
2 Ceiling
Figure 102 – Inclined ceiling test
___________
305 mm
IEC 60670-21 ®
Edition 2.0 2024-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Boxes and enclosures for electrical accessories for household and similar fixed
electrical installations –
Part 21: Particular requirements for boxes and enclosures with provision for
suspension means
Boîtes et enveloppes pour appareillage électrique pour installations électriques
fixes pour usages domestiques et analogues –
Partie 21: Règles particulières concernant les boîtes et enveloppes avec
dispositifs de suspension
– 2 – IEC 60670-21:2024 © IEC 2024
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General requirements . 6
5 General remarks on tests . 6
6 Ratings . 6
7 Classification . 7
8 Marking . 7
9 Dimensions. 7
10 Protection against electric shock . 7
11 Provision for earthing . 7
12 Construction . 8
13 Resistance to ageing, protection against ingress of solid objects and against
harmful ingress of water . 8
14 Insulation resistance and electric strength . 8
15 Mechanical strength . 8
16 Resistance to heat . 12
17 Creepage distances, clearances and distances through sealing compound . 13
18 Resistance of insulating material to abnormal heat and to fire . 13
19 Resistance to tracking . 13
20 Resistance to corrosion . 13
21 Electromagnetic compatibility (EMC) . 13
Figure 101 – Examples of suspension means . 6
Figure 102 – Examples of boxes and enclosures with provision for suspension means . 9
Figure 103 – Verification of suspension means intended to be used on a wall . 11
Figure 104 – Inclined ceiling test. 12
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES FOR
HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIONS –
Part 21: Particular requirements for boxes and
enclosures with provision for suspension means
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
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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
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IEC 60670-21 has been prepared by subcommittee 23B: Plugs, socket-outlets and switches, of
IEC technical committee 23: Electrical accessories. It is an International Standard.
This second edition cancels and replaces the first edition published in 2004 and
Amendment 1:2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Complete revision of the tests and requirements of the suspension means.
– 4 – IEC 60670-21:2024 © IEC 2024
The text of this International Standard is based on the following documents:
Draft Report on voting
23B/1534/FDIS 23B/1552/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.
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.
This document is to be used in conjunction with IEC 60670-1:2024. It lists the changes
necessary to convert that standard into a specific standard for housing protective devices and
other power dissipating electrical equipment.
Where this document states "addition", "modification" or "replacement", the relevant
requirement, test specifications or explanatory matter in IEC 60670-1:2024 shall be adapted
accordingly.
Clauses and subclauses, notes, figures or tables which are additional to those in
IEC 60670-1:2024 are numbered starting from 101.
Additional annexes to IEC 60670-1:2024 are numbered AA, BB, etc.
In this publication the following print types are used:
• requirements proper: in roman type.
• test specifications: in italic type.
• notes: in smaller roman type.
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.
BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES FOR
HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIONS –
Part 21: Particular requirements for boxes and
enclosures with provision for suspension means
1 Scope
Clause 1 of IEC 60670-1:2024 is applicable with the following modification:
Addition after the third paragraph:
This document applies to boxes and enclosures for ceiling and wall mounting with provision for
suspension means.
2 Normative references
Clause 2 of IEC 60670-1:2024 is applicable.
3 Terms and definitions
Clause 3 of IEC 60670-1:2024 is applicable with the following modification:
Addition:
3.101
box with provision for suspension means
box intended to be used for suspending and supporting mechanical loads and which accepts
the suspension means
3.102
suspension means
means comprising any necessary components (hooks, brackets, etc.) which may be delivered
with the box and enclosure or supplied separately
Note 1 to entry: Examples of suspension means are shown in Figure 101.
– 6 – IEC 60670-21:2024 © IEC 2024
a) Box provided with provision for suspension means
b) Suspension means
c) Box and enclosure delivered with suspension means
Figure 101 – Examples of suspension means
4 General requirements
Clause 4 of IEC 60670-1:2024 is applicable.
5 General remarks on tests
Clause 5 of IEC 60670-1:2024 is applicable.
6 Ratings
Void.
7 Classification
Clause 7 of IEC 60670-1:2024 is applicable with the following modification:
Addition to Table 1:
b
7.101.1 For supporting a luminaire.
7.101 The provision for suspension means
7.101.2 For supporting a ceiling fan.
b
The suspension means may be provided with the box or not.
8 Marking
Clause 8 of IEC 60670-1:2024 is applicable with the following modification:
8.1 General
Addition after item k):
l) for boxes and enclosures classified according to 7.101.1, the maximum supported mass in
kilograms declared by the manufacturer.
NOTE 101 In the following countries boxes for luminaire support are marked "For luminaire support". Where boxes
are intended to support a mass greater than 15,8 kg, the mass is to be marked: US.
NOTE 102 In the following country the marking in kilograms shall reflect a safety factor of 5 times: DK.
9 Dimensions
Clause 9 of IEC 60670-1:2024 is applicable.
10 Protection against electric shock
Clause 10 of IEC 60670-1:2024 is applicable with the following modification:
Addition:
Conductive parts of suspension means inside the box or enclosure shall be:
– protected by a layer of insulating material which complies with the tests for insulating linings,
or
– located such that it will not come in contact with electrical conductors or live parts, or
– reliably connected to the earthing means complying with requirements of 11.1 when fitted
as for normal use.
11 Provision for earthing
Clause 11 of IEC 60670-1:2024 is applicable.
– 8 – IEC 60670-21:2024 © IEC 2024
12 Construction
Clause 12 of IEC 60670-1:2024 is applicable with the following modification:
Addition:
12.101 Provision for suspension means
Unless otherwise declared by the manufacturer, screws for fixing accessories and/or covers are
not considered as provision for suspension means.
12.102 Minimum mass to be supported by suspension means
Boxes and enclosures with provision for suspension means shall be able to support a mass of
at least 5 kg.
NOTE For fixing means of a luminaire, a minimum supported mass of 5 kg is given in IEC 60364-5-55:2011, 559.5.2.
Compliance is checked by the tests of 15.101.
13 Resistance to ageing, protection against ingress of solid objects and against
harmful ingress of water
Clause 13 of IEC 60670-1:2024 is applicable.
14 Insulation resistance and electric strength
Clause 14 of IEC 60670-1:2024 is applicable.
15 Mechanical strength
Clause 15 of IEC 60670-1:2024 is applicable with the following modification:
Addition:
15.101 Boxes and enclosures with provision for suspension means
15.101.1 Boxes and enclosures with provision for suspension means shall withstand the
thermal and mechanical stresses occurring in normal use.
Boxes and enclosures with provision for suspension means according to:
– 7.101.1 shall comply with the requirements of 15.101.2 and 15.101.3;
– 7.101.2 shall comply with the requirements of 15.101.4.
Examples of boxes and enclosures with provision for suspension means are shown in
Figure 102.
a) Boxes and enclosures which are intended for suspension of loads from a ceiling.
b) Boxes and enclosures which are intended for suspension of loads from a wall
c) Boxes and enclosures which are intended to support a ceiling fan
Key
1 ceiling
2 wall
3 box
4 suspension mean
5 ceiling fan
Figure 102 – Examples of boxes and enclosures with provision for suspension means
15.101.2 Boxes and enclosures which are intended for suspension of loads from a ceiling shall
withstand a test force of 250 N or a higher test force X corresponding to five times the maximum
supported mass in kilograms declared by the manufacturer.
The test force F in newtons is the result of the maximum supported mass in kilograms multiplied
by the gravity and multiplied by a safety factor of 5; this value is rounded up to the next decimal,
for example: 5 kg × 9,81 m/s × 5 ≈ 245, gives a test force of 250 N.
NOTE 101 In the following countries there is no requirement for all boxes and enclosures for suspension means to
withstand 250 N and no requirement for non-metallic boxes and enclosures to withstand 90° C: UK.
NOTE 102 In the following country, the test force Y shall correspond to 5 times the marking in kilograms as required
in item k) of 8.1: DK
NOTE 103 In Spain, there are no requirements for all boxes and enclosures for suspension means
...
Frequently Asked Questions
IEC 60670-21:2024 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Boxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 21: Particular requirements for boxes and enclosures with provision for suspension means". This standard covers: IEC 60670-21:2024 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. Other temperatures outside the above range can apply according to the classification of the boxes and the enclosures. This document applies to boxes and enclosures for ceiling and wall mounting with provision for suspension means. This second edition cancels and replaces the first edition published in 2004 and Amendment 1:2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Complete revision of the tests and requirements of the suspension means.
IEC 60670-21:2024 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. Other temperatures outside the above range can apply according to the classification of the boxes and the enclosures. This document applies to boxes and enclosures for ceiling and wall mounting with provision for suspension means. This second edition cancels and replaces the first edition published in 2004 and Amendment 1:2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Complete revision of the tests and requirements of the suspension means.
IEC 60670-21:2024 is classified under the following ICS (International Classification for Standards) categories: 29.120.99 - Other electrical accessories. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 60670-21:2024 has the following relationships with other standards: It is inter standard links to IEC 60670-21:2004, IEC 60670-21:2004/AMD1:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 60670-21:2024 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of IEC standards.
The IEC 60670-21:2024 standard outlines particular requirements for boxes and enclosures designed for electrical accessories used in household and similar fixed electrical installations. This document specifically caters to enclosures intended for mounting on ceilings and walls, which include provisions for suspension means. The scope of the standard encompasses boxes and enclosures rated for voltages not exceeding 1,000 V AC and 1,500 V DC, thereby ensuring safety and reliability in residential and similar contexts. One of the primary strengths of IEC 60670-21:2024 is its comprehensive technical specifications that focus on the performance and durability of electrical enclosures. The standard establishes stringent requirements regarding ambient temperature limits, stipulating conditions that optimize the functioning of these electrical components. By ensuring that these requirements comply with operational temperatures typically not exceeding +40 °C, while managing average conditions over a 24-hour period of +35 °C, the standard promotes safety and equipment longevity. Additionally, it accommodates lower temperature limits down to −5 °C, allowing for versatile application in varying environments. The technical revision included in this second edition marks a significant improvement over the previous edition, primarily through a complete overhaul of the tests and requirements associated with suspension means. This enhancement speaks to the evolving needs of the industry, ensuring that the standards applied to enclosures are current and relevant to modern installation methods. Such revisions not only improve safety protocols but also encourage innovation in design and functionality for manufacturers of electrical accessories. Furthermore, the focus on suspension means emphasizes the importance of secure attachment points for boxed installations, addressing potential hazards that could arise from improper mounting. By incorporating such detailed criteria, IEC 60670-21:2024 bolsters the reliability of electrical installations, which is paramount for maintaining safe household electrical systems. In summary, IEC 60670-21:2024 presents a well-defined framework for the safety, performance, and usability of boxes and enclosures for electrical accessories. Its updated provisions ensure that the standard remains pertinent in a rapidly evolving electrical landscape, reinforcing its relevance for manufacturers, installers, and consumers alike. The meticulous attention to detail in this standard signifies its crucial role in establishing a safe and high-quality environment for electrical installations in residential and similar settings.
IEC 60670-21:2024は、家庭用または類似の固定電気設備用の電気アクセサリに関するボックスおよびエンクロージャに特化した標準として位置付けられています。本規格は、定格電圧が1,000 V ACおよび1,500 V DCを超えない電気アクセサリに対応するボックスおよびエンクロージャに適用され、屋内外での使用を想定しています。 この標準の適用範囲は、特に天井および壁面取付用のボックスとエンクロージャにおける吊り下げ手段の提供に焦点を当てており、付加的な機能を許容しています。特に、環境温度の制限（通常+40 °Cを超えず、24時間の平均が+35 °Cを超えないこと、下限が−5 °Cであること）を明確に設定しており、様々な使用条件に対応できる柔軟性を持ち合わせています。 強化された点として、吊り下げ手段の試験および要求事項の完全な改訂が挙げられます。これにより、安全性および信頼性が大幅に向上し、実際の使用環境における性能が確保されています。これらの技術的変更は、電気設備の設計者や取り扱い業者にとって、より明確で実践的なガイドラインを提供することが期待されます。 IEC 60670-21:2024は、家庭用および類似固定電気設置におけるボックスとエンクロージャに対する要求を具体的かつ詳細に示しており、技術的な基準の向上に貢献しています。この文書は、最新の技術基準を反映したものであり、業界の信頼性を高めるための重要なリソースとなるでしょう。特にこの標準は、吊り下げ手段に関する革新を強調しており、今後の開発においてもその重要性はさらに増すと考えられます。
IEC 60670-21:2024 규격은 가정용 및 유사한 고정 전기 설치를 위한 전기 액세서리의 박스와 인클로저에 관한 특수 요구사항을 다루고 있습니다. 이 규격은 정격 전압이 1,000 V AC 및 1,500 V DC를 초과하지 않는 전기 액세서리에 적합한 박스 및 인클로저를 위한 기준을 제공합니다. 주거 또는 유사한 환경에서 실내외에 사용하기 위한 박스 및 인클로저는 주로 +40 °C를 초과하지 않는 주변 온도에서 사용될 수 있으며, 24시간 평균 온도는 +35 °C를 초과하지 않아야 합니다. 또한, 박스와 인클로저에 대한 하한 온도는 -5 °C로 설정되어 있습니다. 이 문서는 천장 및 벽 장착을 위한 박스와 인클로저에 대한 요구사항을 포함하고 있으며, 특히 서스펜션 수단을 제공하는 제품에 중점을 둡니다. IEC 60670-21:2024는 2004년에 발표된 첫 번째 판과 2016년 개정판을 대체하며, 기술적인 개정을 포함하고 있습니다. 특히 주목할 만한 점은 서스펜션 수단에 대한 테스트 및 요구사항이 전면적으로 수정되었다는 것입니다. 이러한 변화는 제품의 안전성과 운영 효율성을 극대화하며, 사용자가 보다 신뢰할 수 있는 전기 액세서리를 선택할 수 있도록 정보를 제공합니다. 이 규격은 현대적 기준에 부합하며, 전기 설치 업계와 관련 분야에 중요한 가이드라인을 제공하는 점에서 매우 중요한 역할을 합니다. 따라서 IEC 60670-21:2024는 특히 가정용 및 유사 환경에서 전기 안전과 효율성을 고려한 필수적인 문서라고 할 수 있습니다.
Die Norm IEC 60670-21:2024 bietet eine umfassende und detaillierte Regelung für Kästen und Gehäuse von elektrischen Zubehörteilen, die für Haushalts- und ähnliche feste elektrische Installationen bestimmt sind. Die Norm beschreibt spezifische Anforderungen für Kästen und Gehäuse mit Vorrichtungen für Aufhängemittel und ist darauf ausgelegt, eine sichere und zuverlässige Verwendung in einem Spannungsbereich von bis zu 1 000 V AC und 1 500 V DC zu gewährleisten. Ein herausragendes Merkmal dieser Norm ist der Fokus auf die Nutzung unter bestimmten Temperaturbedingungen. Sie legt fest, dass die geeigneten Kästen und Gehäuse bei Umgebungstemperaturen von bis zu +40 °C verwendet werden können, solange der tägliche Durchschnitt 35 °C nicht überschreitet und die minimale Temperatur −5 °C beträgt. Dies stellt sicher, dass die Produkte auch unter moderaten klimatischen Bedingungen effizient funktionieren. Die Norm hat in dieser zweiten Auflage, die die erste Auflage von 2004 sowie die Ergänzung 1:2016 ersetzt, eine bedeutende technische Überarbeitung erfahren. Insbesondere wurden die Tests und Anforderungen an die Aufhängemittel vollständig überarbeitet, was die Relevanz der Norm für Verbraucher und Hersteller im Hinblick auf Sicherheit und Leistung erhöht. Durch die spezifische Ausrichtung auf Kästen und Gehäuse für die Decken- und Wandmontage mit Mittel für die Aufhängung leistet die IEC 60670-21:2024 einen wertvollen Beitrag zur Standardisierung in der Elektroinstallationstechnik. Diese Norm ist entscheidend für die Förderung von Sicherheit und Effizienz in elektrischen Installationen und macht sie somit zu einem unerlässlichen Referenzdokument für Fachleute und Unternehmen, die in diesem Bereich tätig sind.
La norme IEC 60670-21:2024 se consacre aux exigences particulières concernant les boîtiers et les enclosures destinés aux accessoires électriques pour des installations fixes dans des environnements domestiques et similaires. Cette norme est d'une grande portée, s'appliquant à des dispositifs ayant une tension nominale ne dépassant pas 1 000 V AC et 1 500 V DC, ce qui la rend particulièrement pertinente pour les utilisateurs souhaitant garantir la sécurité et la conformité de leurs installations électriques. L'un des principaux points forts de cette norme réside dans sa capacité à s'adapter aux différentes conditions ambiantes. En effet, IEC 60670-21:2024 stipule que les boîtiers et enclosures doivent être utilisés à des températures ambiantes ne dépassant pas +40 °C, tout en précisant que la moyenne sur 24 heures ne doit pas excéder +35 °C, avec un minimum à -5 °C. Cette flexibilité assure une utilisation sécurisée et fiable dans divers environnements, que ce soit à l'intérieur ou à l'extérieur. Une autre force majeure de cette norme est son focus sur les moyens de suspension. Cette révision technique complète apporte des changements significatifs par rapport à l'édition précédente, notamment une révision intégrale des tests et des exigences relatifs aux moyens de suspension. Cela améliore non seulement la sécurité des installations électriques, mais également leur facilité d'utilisation et leur adaptabilité. En résumé, la norme IEC 60670-21:2024 est une ressource essentielle pour les professionnels de l'électricité, car elle offre des directives claires et précises pour le choix et l'installation de boîtiers et d'enclosures adaptés aux accessoires électriques. Sa révision approfondie et ses exigences étendues garantissent une conformité élevée et une sécurité accrue dans toutes les installations électriques de type domestique ou similaire.
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