520 Introduction
520.1 Scope
Part 5-52 of GB/T 16895 deals with the selection and erection of wiring systems.
Note 1: This standard also applies in general to protective conductors, while IEC 60364-5-54 contains further requirements for those conductors.
Note 2: Guidance on Part 5-52 is given in IEC 61200-52.
520.2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 16895.1-2008 Low-voltage Electrical Installations - Part 1: Fundamental Principles Assessment of General Characteristics Definitions (IEC 60364-1:2005, IDT)
GB 16895.21-2011 Electrical Installations of Buildings - Part 4-41: Protection for Safety - Protection against Electric Shock (IEC 60364-4-41:2005,IDT)
IEC 60228 Conductors of Insulated Cables
IEC 60287(All Parts) Electric Cables - Calculation of the Current Rating
IEC 60287-2-1 Electric Cables - Calculation of the Current Rating - Part 2-1: Thermal Resistance - Calculation of Thermal Resistance
IEC 60287-3-1 Electric Cables - Calculation of the Current Rating - Part 3-1: Sections on Operating Conditions - Reference Operating Conditions and Selection of Cable Type
IEC 60332-1-1 Tests on Electric and Optical Fibre Cables under Fire Conditions - Part 1-1: Test for Vertical Flame Propagation for a Single Insulated Wire or Cable - Apparatus
IEC 60332-1-2 Tests on Electric and Optical Fibre Cables under Fire Conditions - Part 1-2: Test for Vertical Flame Propagation for a Single Insulated Wire or Cable - Procedure for 1 Kw Premixed Flame
IEC 60364-4-42 Electrical Installations of Buildings - Part 4-42: Protection for Safety - Protection against Thermal Effects
IEC 60364-5-54 Electrical Installations of Buildings - Part 5-54: Selection and Erection of Electrical Equipment - Earthing Arrangements, Protective Conductors and Protective Bonding Conductors
IEC 60439-2 Low-Voltage Switchgear and Controlgear Assemblies - Part 2: Particular Requirements for Busbar Trunking Systems (Busways)
IEC 60449 Voltage Bands for Electrical Installations of Buildings
IEC 60502 Power Cables with Extruded Insulation and Their Accessories for Rated Voltages from 1Kv (Um=1.2Kv) up to 30Kv (Um=36Kv)
IEC 60529 Degrees of Protection Provided by Enclosures (IP Code)
IEC 60570 Electrical Supply Track Systems for Luminaires
IEC 60702(All Parts) Mineral Insulated Cables and Their Terminations with a Rated Voltage Not Exceeding 750V
IEC 60947-7(All Parts 7) Low-Voltage Switchgear and Controlgear - Part 7: Ancillary Equipment
IEC 60998(All Parts) Connecting Devices for Low Voltage Circuits for Household and Similar
IEC 61084(All Parts) Cable Trunking and Ducting Systems for Electrical Installations
IEC 61386(All Parts) Conduit Systems for Cable Management
IEC 61534(All Parts) Powertrack Systems
IEC 61537 Cable Management - Cable Tray Systems and Cable Ladder Systems
ISO 834(All Parts) Fire-resistance Tests - Elements of Building Construction
520.3 Terminologies and Definitions
For the purposes of this document, the following terminologies and definitions apply.
520.3.1
Wiring system
Assembly made up of bare or insulated conductors or cables or busbars and the parts which secure and if necessary enclose the cables or busbars
520.3.2
Busbar
Low impedance conductor to which several electric circuits can be separately connected.
[IEV 605-02-01]
520.4 General
Consideration shall be given to the application of the fundamental principles of GB/T 16895.1 - 2008as it applies to:
- Cables and conductors,
- Their termination and/or jointing;
Foreword I
520 Introduction
520.1 Scope
520.2 Normative References
520.3 Terminologies 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 Installation of Wiring Systems in Relation to Maintainability, Including Cleaning
Appendix A (Normative) Methods of Installations
Appendix B (Informative) Current-Carrying Capacities
Appendix C (Informative) Example of a Method of Simplification of the Tables of Clause
Appendix D (Informative) Formulae to Express Current-Carrying Capacities
Appendix E (Normative) Effect of Harmonic Currents on Balanced Three-Phase Systems
Appendix F (Informative) Selection of Conduit Systems
Appendix G (Informative) Voltage Drop in Consumers’ Equipment
Appendix H (Informative) Examples of Configuration of Parallel Cables
Bibliography
