IEC 60670-24:2011

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 60670-24:2011 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. This second edition cancels and replaces the first edition published in 2005 and constitutes a technical revision. The following major changes from the first edition are introduced:
- new definition for basic, general purpose enclosures (GP enclosure) and enclosures for pre-determined equipment (PD enclosure);
- new classification and marking for general purpose enclosure (GP enclosure) and enclosure for pre-determined equipment (PD enclosure);
- required data for instruction sheet and/or documentation according to the type of enclosure;
- adequate space to allow mounting and connection of the accessories (fully equipped) as declared by the manufacturer;
- requirements for general purpose enclosure (GP enclosure) as in Clause 101;
- requirements for enclosure for pre-determined equipment (PD enclosure) as in Clause 102;
- instructions to be given by the manufacturer of the GP enclosure to the installer how to integrate accessories and example of calculation given in Annex AA;
- instructions to be given by the manufacturer of the PD enclosure to the installer how to integrate accessories given in Annex BB.
This publication is to be read in conjunction with IEC 60670-1:2002.

Boîtes et enveloppes pour appareillage electrique pour installations électriques fixes pour usages domestiques et analogues - Partie 24: Exigences particulières pour enveloppes pour appareillages de protection et autres appareillages électriques ayant une puissance dissipée

La CEI 60670-24:2011 s'applique aux enveloppes et à leurs parties pour appareillages de protection et autres appareillages électriques ayant une puissance dissipée, destinés à être utilisés avec une tension assignée n'excédant pas 400 V et un courant de charge total à l'arrivée n'excédant pas 125 A pour les installations électriques fixes pour usages domestiques et analogues. Cette deuxième édition annule et remplace la première édition parue en 2005 et constitue une révision technique. Les principales modifications introduites par rapport à la première édition sont les suivantes:
- nouvelle définition pour les enveloppes simples, les enveloppes à usage général (enveloppe GP) et les enveloppes à usage prédéterminé (enveloppe PD);
- nouvelle classification et marquage pour les enveloppes à usage général (enveloppe GP) et les enveloppes à usage prédéterminé (enveloppe PD);
- informations requises dans les notices et/ou la documentation selon le type d'enveloppe;
- espace suffisant permettant le montage et le raccordement de l'appareillage (entièrement équipés) tels que déclarés par le fabricant;
- exigences pour les enveloppes à usage général (enveloppe GP) dans l'Article 101;
- exigences pour les enveloppes à usage prédéterminé (enveloppe PD) dans l'Article 102;
- instructions devant être fournies par le fabricant de l'enveloppe GP à l'installateur sur la façon d'intégrer les appareillages, et exemple de calcul décrites dans l'Annexe AA;
- instructions devant être fournies par le fabricant de l'enveloppe PD à l'installateur sur la façon d'intégrer les appareillages décrites dans l'Annexe BB.
Cette publication doit être lue conjointement avec la CEI 60670-1:2002.

General Information

• Status: Published
• Publication Date: 07-Mar-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.035.20 - Plastics and rubber insulating materials
• ICS: 29.060.20 - Cables
• ICS: 29.120.10 - Conduits for electrical purposes
• Technical Committee: SC 23B - Plugs, socket-outlets and switches
• Drafting Committee: MT 5 - TC 23/SC 23B/MT 5
• Current Stage: PPUB - Publication issued
• Start Date: 15-Mar-2011
• Completion Date: 08-Mar-2011

Relations

• Revises: IEC 60670-24:2005 - Boxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 24: Particular requirements for enclosures for housing protective devices and similar power consuming devices
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60670-24 ®
Edition 2.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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

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 appareillages électriques ayant une puissance dissipée

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IEC 60670-24 ®
Edition 2.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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

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 appareillages électriques ayant une puissance dissipée

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 29.120.10 ISBN 978-2-88912-391-9

– 2 – 60670-24  IEC:2011
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Definitions . 7
4 General requirements . 8
5 General notes on tests . 8
6 Ratings . 8
7 Classification . 8
8 Marking . 8
9 Dimensions . 10
10 Protection against electric shock. 10
11 Provisions for earthing . 11
12 Construction . 11
13 Resistance to ageing, protection against ingress of solid foreign objects and
against harmful ingress of water . 12
14 Insulation resistance and electric strength . 12
15 Mechanical strength . 12
16 Resistance to heat . 12
17 Creepage distances, clearances and distances through sealing compound . 12
18 Resistance of insulating material to abnormal heat and to fire. 13
19 Resistance to tracking . 13
20 Resistance to corrosion . 14
21 Electromagnetic compatibility . 14
101 Verification of the maximum capability to dissipate power (P ) . 14
de
102 Verification of temperature rise . 15
Annex AA (normative) Instructions to be given by the manufacturer of the GP
enclosure to the installer how to integrate accessories, and example of calculation . 22
Annex BB (normative) Instructions to be given by the manufacturer of the PD
enclosure to the installer how to integrate accessories . 30
Bibliography . 32

Figure 101 – Arrangement for the verification of the maximum capability to dissipate
power (P ) and for verification of temperature rise of surface type enclosures . 17
de
Figure 102 – Heating resistor for the verification of the maximum capability to dissipate
) . 18
power (P
de
Figure 103 – Position of the resistor for enclosures designed or intended to be fitted
with rail mounting modular accessories and electrical equipment . 19
Figure 104 – Position of the resistor(s) for enclosures other than those designed or
intended to be fitted with rail mounting accessories and electrical equipment . 20
Figure 105 – Position of the resistor(s) for enclosures other than those designed or
intended to be fitted with rail mounting accessories and electrical equipment and
allowing the mounting of several accessories and electrical equipment in different
positions . 21

60670-24  IEC:2011 – 3 –
Table 1 – Classification of boxes and enclosures . 8
Table 101 – Creepage distances, clearances and distances through sealing compound . 13
Table 102 – Diversity factor . 16
Table 103 – Temperatures of accessible surfaces . 17
Table AA.1 – Diversity factor . 24
Table AA.2 – Tests and verifications . 25
Table AA.3 – Calculation of P . 28
dp
Table AA.4 – Calculation of P . 29
au
– 4 – 60670-24  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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

FOREWORD
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