IEC 60670-1:2024
(Main)Boxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 1: General requirements
Boxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 1: General requirements
IEC 60670-1:2024 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 is intended to apply to boxes and enclosures for electrical accessories within the scope of IEC technical committee 23.
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.
Boîtes et enveloppes pour appareillage électrique pour installations électriques fixes pour usages domestiques et analogues - Partie 1: Exigences générales
L'IEC 60670-1:2024 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.
Cette troisième édition annule et remplace la deuxième édition parue en 2015. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) les classifications, marquages et essais des boîtes et enveloppes destinées à être utilisées et installées à une température ambiante inférieure à la normale ont été modifiés;
b) l'essai de durabilité des marquages a été modifié;
c) un essai a été ajouté pour les vis de fixation protégées par des bouchons;
d) une annexe normative a été ajoutée pour spécifier les essais appliqués aux boîtes et enveloppes déclarées avec un code IK;
e) des exigences ont été spécifiées pour la résistance à la chaleur anormale et au feu des parties internes qui ne sont pas nécessaires au maintien en place des pièces sous tension.
La version française n'a pas été soumise au vote.
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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
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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 – E
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