IEC 60364-5-52:2009

FOREWORD
520 Introduction
    520.1 Scope
    520.2 Normative references
    520.3 Terms and definitions
    520.4 General
521 Types of wiring system
    521.4 Busbar trunking systems and powertrack systems
    521.5 AC circuits - Electromagnetic effects (prevention
           of eddy current)
    521.6 Conduit systems, cable ducting systems, cable
           trunking systems, cable tray systems and cable
           ladder systems
    521.7 Several circuits in one cable
    521.8 Circuit arrangements
    521.9 Use of flexible cables or cords
    521.10 Installation of cables
522 Selection and erection of wiring systems in relation to
    external influences
    522.1 Ambient temperature (AA)
    522.2 External heat sources
    522.3 Presence of water (AD) or high humidity (AB)
    522.4 Presence of solid foreign bodies (AE)
    522.5 Presence of corrosive or polluting substances (AF)
    522.6 Impact (AG)
    522.7 Vibration (AH)
    522.8 Other mechanical stresses (AJ)
    522.9 Presence of flora and/or mould growth (AK)
    522.10 Presence of fauna (AL)
    522.11 Solar radiation (AN) and ultraviolet radiation
    522.12 Seismic effects (AP)
    522.13 Wind (AR)
    522.14 Nature of processed or stored materials (BE)
    522.15 Building design (CB)
523 Current-carrying capacities
    523.5 Groups containing more than one circuit
    523.6 Number of loaded conductors
    523.7 Conductors in parallel
    523.8 Variation of installation conditions along a route
    523.9 Single-core cables with a metallic covering
524 Cross-sectional areas of conductors
    524.2 Cross-sectional area of the neutral conductor
525 Voltage drop in consumers' installations
526 Electrical connections
    526.8 Connection of multi wire, fine wire and very fine
           wire conductors
527 Selection and erection of wiring systems to minimize the
    spread of fire
    527.1 Precautions within a fire-segregated compartment
    527.2 Sealing of wiring system penetrations
528 Proximity of wiring systems to other services
    528.1 Proximity to electrical services
    528.2 Proximity of communications cables
    528.3 Proximity to non-electrical services
529 Selection and erection of wiring systems in relation to
    maintainability, including cleaning
Annex A (normative) - Methods of installations
Annex B (informative) - Current-carrying capacities
Annex C (informative) - Example of a method of simplification
                        of the tables of Clause 523
Annex D (informative) - Formulae to express current-carrying
                        capacities
Annex E (normative) - Effect of harmonic currents on balanced
                      three-phase systems
Annex F (informative) - Selection of conduit systems
Annex G (informative) - Voltage drop in consumers' installations
Annex H (informative) - Examples of configurations of parallel
                        cables
Annex I (informative) - List of notes concerning certain countries
Bibliography

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.