IEC 60364-5-52:2009

Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems

IEC 60364-5-52:2009 deals with the selection and erection of wiring systems. This third edition cancels and replaces the second edition, published in 2001, and constitutes a technical revision. The main changes with respect to the previous edition are as follows:
- Subclause 521.4 introduces minor changes with regard to busbar trunking systems and powertrack systems.
- Subclause 523.6 introduces minor changes with regard to the sizing of cables where harmonic currents are present.
- A new sublause 523.9 concerning single-core cables with a metallic covering has been introduced.
- Clause 525 introduces changes in the maximum value of voltage drop permitted between the origin of the consumer's installation and the equipment which should not be greater than that given in the relevant annex.
- Clause 526 introduces minor changes to electrical connections including additional exceptions for inspection of connections and additional notes.
- Clause 528 introduces additional requirements with regard to proximity of underground power and telecommunication cables.
- Clause 529 introduces minor changes to selection and erection of wiring systems in relation to maintainability, including cleaning. The contents of the corrigendum of February 2011 have been included in this copy.

Installations électriques à basse-tension - Partie 5-52: Choix et mise en oeuvre des matériels électriques - Canalisations

La CEI 60364-5-52:2009 traite du choix et de la mise en oeuvre des canalisations. Cette troisième édition annule et remplace la deuxième édition, publiée en 2001. Elle constitue une révision technique. Les principaux changements par rapport à l'édition précédente sont les suivants:
- Le paragraphe 521.4 apporte des changements mineurs aux canalisations préfabriquées et aux systèmes de conducteurs préfabriqués.
- Le paragraphe 523.6 apporte des changements mineurs au dimensionnement des câbles en présence de courants harmoniques.
- Un nouveau paragraphe 523.9 a été introduit; il concerne les câbles monoconducteurs à gaine métallique.
- L'Article 525 insère des modifications de la valeur maximale de la chute de tension admissible entre l'origine de l'installation et l'équipement de l'utilisateur; il convient que celle-ci ne soit pas supérieure à celle donnée dans l'annexe correspondante.
- L'Article 526 apporte des changements mineurs aux connexions électriques, y compris des restrictions relatives à la vérification des connexions et des notes complémentaires.
- L'Article 528 introduit des exigences supplémentaires concernant le voisinage des câbles enterrés de réseaux d'énergie et de communications.
- L'Article 529 apporte des changements mineurs au choix et à la mise en uvre des canalisations en fonction de la maintenance, comprenant le nettoyage. Le contenu du corrigendum de février 2011 a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 21-Nov-2024
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 13.260 - Protection against electric shock. Live working
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: TC 64 - Electrical installations and protection against electric shock
• Drafting Committee: MT 2 - TC 64/MT 2
• Current Stage: PPUB - Publication issued
• Start Date: 31-Oct-2009
• Completion Date: 20-Oct-2009

Relations

• Corrected By: IEC 60364-5-52:2009/COR1:2011 - Corrigendum 1 - Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems
• Effective Date: 05-Sep-2023
• Revises: IEC 60364-5-52:2001 - Electrical installations of buildings - Part 5-52: Selection and erection of electrical equipment - Wiring systems
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60364-5-52 ®
Edition 3.1 2024-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage electrical installations –
Part 5-52: Selection and erection of electrical equipment – Wiring systems

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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IEC 60364-5-52 ®
Edition 3.1 2024-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage electrical installations –
Part 5-52: Selection and erection of electrical equipment – Wiring systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.260, 91.140.50 ISBN 978-2-8327-0055-6
REDLINE VERSION – 2 – IEC 60364-5-52:2009+AMD1:2024 CSV
 IEC 2024
CONTENTS
FOREWORD . 6
520 Introduction . 8
520.1 Scope . 8
520.2 Normative references . 8
520.3 Terms and definitions . 9
520.4 General . 10
521 Types of wiring system. 10
521.4 Busbar trunking systems and powertrack systems . 10
521.5 AC circuits – Electromagnetic effects (prevention of eddy current) . 10
521.6 Conduit systems, cable ducting systems, cable trunking systems, cable
tray systems and cable ladder systems . 10
521.7 Several circuits in one cable . 11
521.8 Circuit arrangements . 11
521.9 Use of flexible cables or cords . 11
521.10 Installation of cables . 11
522 Selection and erection of wiring systems in relation to external influences . 11
522.1 Ambient temperature (AA) . 12
522.2 External heat sources . 12
522.3 Presence of water (AD) or high humidity (AB) . 12
522.4 Presence of solid foreign bodies (AE) . 12
522.5 Presence of corrosive or polluting substances (AF) . 13
522.6 Impact (AG) . 13
522.7 Vibration (AH) . 13
522.8 Other mechanical stresses (AJ) . 13
522.9 Presence of flora and/or mould growth (AK) . 15
522.10 Presence of fauna (AL) . 15
522.11 Solar radiation (AN) and ultraviolet radiation. 15
522.12 Seismic effects (AP) . 15
522.13 Wind (AR) . 15
522.14 Nature of processed or stored materials (BE) . 15
522.15 Building design (CB) . 15
523 Current-carrying capacities . 16
523.5 Groups containing more than one circuit . 17
523.6 Number of loaded conductors . 17
523.7 Conductors in parallel . 17
523.8 Variation of installation conditions along a route . 18
523.9 Single-core cables with a metallic covering . 18
524 Cross-sectional areas of conductors . 18
524.2 Cross-sectional area of the neutral conductor . 19
524.3 Cross-sectional area of live conductors with triplen harmonics . 20
525 Voltage drop in consumers' installations . 20
526 Electrical connections . 20
526.8 Connection of multi wire, fine wire and very fine wire conductors . 21
527 Selection and erection of wiring systems to minimize the spread of fire . 22
527.1 Precautions within a fire-segregated compartment . 22
527.2 Sealing of wiring system penetrations . 22

 IEC 2024
528 Proximity of wiring systems to other services . 23
528.1 Proximity to electrical services . 23
528.2 Proximity of communications cables . 24
528.3 Proximity to non-electrical services . 24
529 Selection and erection of wiring systems in relation to maintainability, including
cleaning . 24
Annex A (normative) Methods of installations . 26
Annex B (informative) Current-carrying capacities . 35
Annex C (informative) Example of a method of simplification of the tables of

Clause 523 . 64
Annex D (informative) Formulae to express current-carrying capacities . 68
Annex E (normative) Effect of harmonic currents on balanced three-phase systems . 72
Annex F (informative) Selection of conduit systems . 78
Annex G (informative) Voltage drop in consumers’ installations . 79
Annex H (informative) Examples of configurations of parallel cables . 81
Annex I (informative) List of notes concerning certain countries . 84
Bibliography . 89

Figure H.52.1 – Special configuration for 6 parallel single-core cables in a flat plane
(see 523.7) . 81
Figure H.52.2 – Special configuration for 6 parallel single-core cables above each
other (see 523.7) . 81
Figure H.52.3 – Special configuration for 6 parallel single-core cables in trefoil (see

523.7) . 82
Figure H.52.4 – Special configuration for 9 parallel single-core cables in a flat plane
(see 523.7) . 82
Figure H.52.5 – Special configuration for 9 parallel single-core cables above each
other (see 523.7) . 82
Figure H.52.6 – Special configuration for 9 parallel single-core cables in trefoil (see

523.7) . 83
Figure H.52.7 – Special configuration for 12 parallel single-core cables in a flat plane
(see 523.7) . 83
Figure H.52.8 – Special configuration for 12 parallel single-core cables above each
other (see 523.7) . 83
Figure H.52.9 – Special configuration for 12 parallel single-core cables in trefoil (see

523.7) . 83

Table 52.1 – Maximum operating temperatures for types of insulation . 16
Table 52.2 – Minimum cross-sectional area of conductors . 19
Table A.52.1 – Methods of installation in relation to conductors and cables . 26
Table A.52.2 – Erection of wiring systems . 27
Table A.52.3 – Examples of methods of installation providing instructions for obtaining
current-carrying capacity . 28
Table B.52.1 – Installation reference methods forming basis of tabulated current-
carrying capacities . 40
Table B.52.2 – Current-carrying capacities in amperes for methods of installation in
Table B.52.1 – PVC insulation/two loaded conductors, copper or aluminium –
Conductor temperature: 70 °C, ambient temperature: 30 °C in air, 20 °C in ground . 42

REDLINE VERSION – 4 – IEC 60364-5-52:2009+AMD1:2024 CSV
 IEC 2024
Table B.52.3 – Current-carrying capacities in amperes for methods of installation in
Table B.52.1 – XLPE or EPR insulation, two loaded conductors/copper or aluminium –
Conductor temperature: 90 °C, ambient temperature: 30 °C in air, 20 °C in ground . 43
Table B.52.4 – Current-carrying capacities in amperes for methods of installation in
Table B.52.1 – PVC insulation, three loaded conductors/copper or aluminium –
Conductor temperature: 70 °C, ambient temperature: 30 °C in air, 20 °C in ground . 44
Table B.52.5 – Current-carrying capacities in amperes for methods of installation in
Table B.52.1 – XLPE or EPR insulation, three loaded conductors/copper or aluminium
– Conductor temperature: 90 °C, ambient temperature: 30 °C in air,
...

IEC 60364-5-52 ®
Edition 3.0 2009-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage electrical installations –
Part 5-52: Selection and erection of electrical equipment – Wiring systems

Installations électriques à basse tension –
Partie 5-52: Choix et mise en œuvre des matériels électriques – Canalisations

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
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IEC 60364-5-52 ®
Edition 3.0 2009-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage electrical installations –
Part 5-52: Selection and erection of electrical equipment – Wiring systems

Installations électriques à basse tension –
Partie 5-52: Choix et mise en œuvre des matériels électriques – Canalisations

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XC
CODE PRIX
ICS 13.260; 91.140.50 ISBN 978-2-88910-175-7
– 2 – 60364-5-52 © IEC:2009
CONTENTS
FOREWORD.6
520 Introduction .8
520.1 Scope .8
520.2 Normative references .8
520.3 Terms and definitions .9
520.4 General .9
521 Types of wiring system .10
521.4 Busbar trunking systems and powertrack systems .10
521.5 AC circuits – Electromagnetic effects (prevention of eddy current).10
521.6 Conduit systems, cable ducting systems, cable trunking systems, cable
tray systems and cable ladder systems.10
521.7 Several circuits in one cable .11
521.8 Circuit arrangements .11
521.9 Use of flexible cables or cords .11
521.10 Installation of cables.11
522 Selection and erection of wiring systems in relation to external influences .11
522.1 Ambient temperature (AA) .11
522.2 External heat sources .12
522.3 Presence of water (AD) or high humidity (AB).12
522.4 Presence of solid foreign bodies (AE) .12
522.5 Presence of corrosive or polluting substances (AF) .13
522.6 Impact (AG) .13
522.7 Vibration (AH).13
522.8 Other mechanical stresses (AJ) .13
522.9 Presence of flora and/or mould growth (AK).15
522.10 Presence of fauna (AL) .15
522.11 Solar radiation (AN) and ultraviolet radiation.15
522.12 Seismic effects (AP) .15
522.13 Wind (AR).15
522.14 Nature of processed or stored materials (BE) .15
522.15 Building design (CB) .15
523 Current-carrying capacities .16
523.5 Groups containing more than one circuit.17
523.6 Number of loaded conductors .17
523.7 Conductors in parallel.17
523.8 Variation of installation conditions along a route .18
523.9 Single-core cables with a metallic covering.18
524 Cross-sectional areas of conductors .18
524.2 Cross-sectional area of the neutral conductor .19
525 Voltage drop in consumers' installations .20
526 Electrical connections .20
526.8 Connection of multi wire, fine wire and very fine wire conductors.21
527 Selection and erection of wiring systems to minimize the spread of fire .21
527.1 Precautions within a fire-segregated compartment.21
527.2 Sealing of wiring system penetrations.22
528 Proximity of wiring systems to other services .23

60364-5-52 © IEC:2009 – 3 –
528.1 Proximity to electrical services.23
528.2 Proximity of communications cables .23
528.3 Proximity to non-electrical services.23
529 Selection and erection of wiring systems in relation to maintainability, including
cleaning.24
Annex A (normative) Methods of installations.25
Annex B (informative) Current-carrying capacities .34
Annex C (informative) Example of a method of simplification of the tables of
Clause 523 .63
Annex D (informative) Formulae to express current-carrying capacities .67
Annex E (normative) Effect of harmonic currents on balanced three-phase systems .71
Annex F (informative) Selection of conduit systems .73
Annex G (informative) Voltage drop in consumers’ installations .74
Annex H (informative) Examples of configurations of parallel cables .76
Annex I (informative) List of notes concerning certain countries .79
Bibliography.84

Figure H.52.1 – Special configuration for 6 parallel single-core cables in a flat plane
(see 523.7) .76
Figure H.52.2 – Special configuration for 6 parallel single-core cables above each
other (see 523.7) .76
Figure H.52.3 – Special configuration for 6 parallel single-core cables in trefoil (see
523.7) .77
Figure H.52.4 – Special configuration for 9 parallel single-core cables in a flat plane
(see 523.7) .77
Figure H.52.5 – Special configuration for 9 parallel single-core cables above each
other (see 523.7) .77
Figure H.52.6 – Special configuration for 9 parallel single-core cables in trefoil (see
523.7) .78
Figure H.52.7 – Special configuration for 12 parallel single-core cables in a flat plane
(see 523.7) .78
Figure H.52.8 – Special configuration for 12 parallel single-core cables above each
other (see 523.7) .78
Figure H.52.9 – Special configuration for 12 parallel single-core cables in trefoil (see
523.7) .78

Table 52.1 – Maximum operating temperatures for types of insulation .
...