IEC 60670-24:2024
(Main)Boxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 24: Particular requirements for enclosures for housing protective devices and other power dissipating electrical equipment
Boxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 24: Particular requirements for enclosures for housing protective devices and other power dissipating electrical equipment
IEC 60670-24:2024 applies to enclosures and parts of them for housing protective devices and other power dissipating electrical equipment intended to be used with a rated voltage not exceeding 400 V and a total incoming load current not exceeding 125 A for household and similar fixed electrical installations. These enclosures are intended to be installed in locations where unskilled persons have access. They are intended to be equipped with electrical equipment by skilled persons (installers). These enclosures are intended to be installed where the prospective short circuit current does not exceed 10 kA unless they are protected by current limiting protective devices with a cut-off current not exceeding 17 kA. Enclosures complying with this document are suitable for use at ambient temperature not normally exceeding 40 °C, but their average temperature over a period of 24 h does not exceed 35 °C, with a lower limit of the ambient air temperature of −5 °C. 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) revision of requirements for protection against electric shock in Clause 10;
b) addition of requirements for functional earthing in 11.101;
c) revision of the requirements for fixing of flush type and semi-flush type enclosures in 12.12;
d) revision of the requirements for resistance of insulating material to abnormal heat and to fire in Clause 18;
e) addition of calculations to take into account the power loss of electronic devices in Clause AA.6;
f) addition of tests and requirements for enclosures exposed to direct sunlight with the related Annex CC;
g) addition of tests and requirements for enclosures with separate area to accommodate multimedia-equipment with the related Annex DD;
h) addition of tests and requirements for enclosures used with connected devices or equipment with the related Annex EE.
Boîtes et enveloppes pour appareillage électrique pour installations électriques fixes pour usages domestiques et analogues - Partie 24: Exigences particulières pour enveloppes pour appareillages de protection et autres équipements électriques ayant une puissance dissipée
L'IEC 60670-24:2024 s'applique aux enveloppes et parties d'enveloppes pour dispositifs de protection et autres matériels électriques ayant une puissance dissipée, destinés à être utilisés avec une tension assignée qui ne dépasse pas 400 V et un courant de charge total à l'arrivée qui ne dépasse pas 125 A pour les installations électriques fixes pour usages domestiques et analogues. Ces enveloppes sont destinées à être installées dans des lieux accessibles aux personnes non qualifiées. Elles sont destinées à incorporer des matériels électriques montés par des personnes qualifiées (installateurs). Ces enveloppes sont destinées à être installées dans des lieux où le courant de court-circuit présumé ne dépasse pas 10 kA, sauf si elles sont protégées par des dispositifs de protection limiteurs de courant, avec un courant coupé limité inférieur ou égal à 17 kA. Les enveloppes conformes au présent document sont adaptées 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. 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) les exigences pour la protection contre les chocs électriques à l'Article 10 ont été révisées;
b) des exigences pour la mise à la terre fonctionnelle ont été ajoutées au 11.101;
c) les exigences pour la fixation des enveloppes pour montage encastré et semi-encastré ont été révisées au 12.12;
d) les exigences pour la résistance du matériau isolant à la chaleur anormale et au feu à l'Article 18 ont été révisées;
e) des calculs ont été ajoutés à l'Article AA.6 pour prendre en compte la puissance dissipée par les appareils électroniques;
f) des essais et exigences ont été ajoutés pour les enveloppes exposées à la lumière directe du soleil, ainsi que l'Annexe CC associée;
g) des essais et exigences ont été ajoutés pour les enveloppes avec espace séparé pour accueillir le matériel multimédia, ainsi que l'Annexe DD associée;
h) des essais et exigences ont été ajoutés pour les enveloppes utilisées avec des appareils ou des équipements connectés, ainsi que l'Annexe EE associée.
La version française de la norme n'a pas été soumise au vote.
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IEC 60670-24 ®
Edition 3.0 2024-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This full version of IEC 60670-24:2024 includes the content of the references made to
IEC 60670-1:2024
Boxes and enclosures for electrical accessories for household and similar fixed
electrical installations –
Part 24: Particular requirements for enclosures for housing protective devices
and other power dissipating electrical equipment
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IEC 60670-24 ®
Edition 3.0 2024-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This full version of IEC 60670-24:2024 includes the content of the references made to
IEC 60670-1:2024
Boxes and enclosures for electrical accessories for household and similar fixed
electrical installations –
Part 24: Particular requirements for enclosures for housing protective devices
and other power dissipating electrical equipment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.10 ISBN 978-2-8327-0115-7
– 2 – IEC 60670-24:2024 EXV © IEC 2024
CONTENTS
FOREWORD . 7
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 12
4 General requirements . 17
5 General remarks on tests . 17
5.1 Test conditions and number of samples . 17
5.2 Compliance general requirement . 17
6 Ratings . 17
7 Classification . 18
8 Marking . 19
8.1 General . 19
8.2 Durability of the marking on the boxes and enclosures . 20
9 Dimensions. 22
10 Protection against electric shock . 22
11 Provision for earthing . 22
11.1 Boxes and enclosures with exposed conductive parts . 22
11.2 Boxes and enclosures of insulating material classified according to 7.2.2.2
and 7.2.2.3 . 23
11.3 Boxes or enclosures with removable sides according to 7.1.2 . 25
11.4 Earthing terminal threads . 25
12 Construction . 26
12.1 General . 26
12.2 Lids, covers or cover-plates or parts of them . 26
12.2.1 General . 26
12.2.2 Screw-type fixing . 26
12.2.3 Non-screw-type fixing operable without the use of a tool or a key . 26
12.2.4 Non-screw-type fixing operable with the use of a tool or a key . 32
12.3 Drain holes . 33
12.4 Mounting of enclosures . 33
12.5 Boxes and enclosures with inlets for flexible cables . 33
12.6 Boxes and enclosures with inlets for applications other than flexible cables . 33
12.7 Boxes and enclosures with a cable anchorage(s) . 34
12.8 Boxes and enclosures with cable retention means . 35
12.9 Knock-outs intended to be removed by mechanical impact . 36
12.9.1 General . 36
12.9.2 Knock-out retention . 36
12.9.3 Knock-out removal . 36
12.9.4 Flat surfaces surrounding knock-outs . 37
12.10 Screw fixings . 37
12.11 Fixing of boxes and enclosures classified according to 7.2.1 . 38
12.12 Fixing of flush type and semi-flush type boxes and enclosures classified
according to 7.2.2.1 . 41
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 . 44
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 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 . 53
15 Mechanical strength . 55
15.1 General . 55
15.2 Impact test at low temperature . 55
15.3 Compression test . 57
15.4 Impact test for boxes and enclosures . 57
15.5 Compression test for enclosures made of natural or synthetic rubber or a
mixture of both . 62
15.6 Test for boxes and enclosures declared with IK code . 64
16 Resistance to heat . 64
16.1 Parts of insulating material necessary to retain current-carrying parts . 64
16.2 Parts of insulating material not necessary to retain current-carrying parts . 65
16.3 Boxes and enclosures of insulating materials classified according to 7.2.2.2
or 7.2.2.3 . 65
16.3.1 Mechanical strength. 65
16.3.2 Parts of insulating material necessary to retain parts of the earthing
circuit . 66
17 Creepage distances, clearances and distances through sealing compound . 66
18 Resistance of insulating material to abnormal heat and fire . 67
19 Resistance to tracking . 69
20 Resistance to corrosion . 70
21 Electromagnetic compatibility (EMC) . 70
101 Verification of the maximum capability to dissipate power (P ) . 70
de
102 Verification of temperature rise . 77
Annex A (informative) Examples of enclosures and parts thereof . 79
Annex B (normative) Test for boxes and enclosures declared with IK code . 80
Annex AA (normative) Instructions to be given by the manufacturer of the GP
enclosure to the installer on how to integrate accessories, and providing an example of
calculation . 81
AA.1 Selection of the GP enclosure . 81
AA.2 Diversity factor . 82
AA.3 Markings . 82
AA.4 Test and verification to be carried out by the installer . 83
AA.5 Example of calculation without electronic devices . 86
AA.6 Example calculation to take into account the power loss of electronic devices . 88
– 4 – IEC 60670-24:2024 EXV © IEC 2024
Annex BB (normative) Instructions to be given by the manufacturer of the PD
enclosure to the installer on how to integrate accessories . 92
BB.1 General .
...
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