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Code of Practice for the Electricity (Wiring) Regulations (2020 Edition)

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Code of Practice for the Electricity (Wiring) Regulations (2020 Edition) CODE OF PRACTICE FOR THE ELECTRICITY (WIRING) REGULATIONS 2020 EDITION CODE OF PRACTICE FOR THE ELECTRICITY (WIRING) REGULATIONS Electrical and Mechanical Services Department 2020 Edition (First Print) 1 1 2 Contents Page Acknowledgements 11 Part I 1. Introduction 12 2. Interpretation 13 3. Application 19 3A General Application of the CoP 20 3B Application to Category 2 Circuit 20 3C Exempted Fixed Electrical Installations 20 4. General Safety Requirements 21 4A General 22 4B Workmanship and Materials 23 4C Design, Construction, Installation and Protection 24 4D Identification, Maintenance, Inspection and Testing 25 4E Working Space 26 4F Switchroom/Substation 27 4G Safety Precautions for Work on Low Voltage Installation 29 4H Safety Precautions for Work on High Voltage Installation 32 4I General Safety Practices 39 5. Segregation of Circuit Categories 41 5A Circuit Category 42 5B Segregation of Category 1, 2 and 3 Circuits 43 5C Segregation of Category 4 Circuits and Circuits of Other Categories 44 5D Segregation of Circuits from Overhead Telecommunication Lines and Telephone Lines 45 6. Circuit Arrangement 47 6A Division of Installation into Circuits 48 6B Basic Requirements of Circuits 48 6C Ring Final Circuit Arrangement 50 2 3 Page 6D Final Circuits Using 5A or 15A Socket Outlets to BS 546 50 6E Final Circuits Using 13A Socket Outlets to BS 1363 51 6F Final Circuits Using Universal Serial Bus (USB) Outlets to IEC 60950-1 52 6G Final Circuits Using 16A Industrial Socket Outlets to IEC 60309 52 6H Final Circuits Using 32A, 63A or 125A Industrial Socket Outlets to IEC 60309 53 6I Protection Requirement of High Voltage Circuit 53 7. Current Demand 60 7A Current Demand of a Circuit 61 7B Determination of Current Demand 61 8. Isolation and Switching 66 8A Provision of Isolation and Switching 67 8B Requirements of Isolation and Switching Devices 71 9. Overcurrent Protective Devices 75 9A General Requirements 76 9B Relation Between Circuit Conductors and Overcurrent Protective Devices 77 9C Breaking Capacity of Overcurrent Protective Devices 78 9D Position of Overcurrent Protective Devices 79 9E Other Requirements of Overcurrent Protective Devices 80 10. Neutral Conductor Protective Devices, Isolators and Switches 83 10A Linked Circuit Breakers, Linked Isolators and Linked Switches 84 10B Protection of Neutral Conductor 84 10C Single-pole Switch in Earthing Conductor 84 11. Earth Leakage and Earth Fault Currents 85 11A General 86 11B Basic Requirements 86 11C Protective Conductors 87 11D Earthing of Exposed Conductive Parts 89 4 Page 11E Equipotential Bonding 90 11F Supplementary Bonding 91 11G Main Earthing Terminal 93 11H Earthing Conductors 93 11I Earth Fault Loop Impedance (Zs) 94 11J Residual Current Devices 95 11K Earth Electrodes 96 12. Earthing Arrangement 106 12A General 107 12B Bonding Connections to the Point of Supply 107 12C Earth Electrode 108 13. Conductors, Joints and Connections 110 13A Selection and Sizing of Cable Conductors 111 13B Basic Protection 113 13C Joints and Connections 114 13D Other Requirements of Cables 115 14. Wiring Installation Enclosure 118 14A General Requirements 119 14B Steel Conduit System 120 14C Steel Trunking System 120 14D Plastic or PVC Conduit or Trunking 121 14E Cable Capacity of Enclosures 122 14F Enclosures of Busbar Trunking System and Powertrack System 123 14G Workmanship 123 15. Adverse Conditions Installation 127 15A Presence of Water (AD) or High Humidity (AB) 128 15B Ambient Temperature (AA) 129 15C Presence of Corrosive or Polluting Substance (AF) 131 15D Installation Exposed to Fire or Explosion 132 15E Impact (AG) 133 4 5 Page 15F Vibration (AH) 134 15G Other Mechanical Stresses (AJ) 134 16. Overhead Line Installations 140 16A General 141 16B Installation of Overhead Lines 141 16C Joints of Overhead Lines 141 16D Service to Building 141 16E Conductor to Ground Clearance 141 16F Pole 142 16G Stay Wire 142 16H Carrier Wire 143 16I Earthing of Metallic Parts and Earth Leakage Protection 143 17. Display of Labels and Notices 144 17A Warning Notice for Substations and Switchrooms 145 17B Warning Notice for Connection of Earthing and Main Bonding Conductors 146 17C Warning Notice for Repair 146 17D Notice of Periodic Testing of Electrical Installations 146 17E Notice of Testing for Residual Current Devices (RCD) 146 17F Warning Notice for Installation Having Both New and Old Cable Colours 147 17G Notice for Renewable Energy Power System 147 18. Alterations and Additions 148 18A Requirements for Alterations or Additions to a Fixed Installation 149 18B Approval from the Electricity Supplier 150 19. First Inspection, Testing and Certification 151 19A Certification on Completion of an Installation 152 19B Work Completion Certificate 152 20. Periodic Inspection, Testing and Certification 154 20A Fixed Electrical Installations Specified in Regulation 20(1) 155 6 Page 20B Fixed Electrical Installations Specified in Regulations 20(2), 20(3) and 20(4) 156 20C Periodic Test Certificate 157 21. Procedures for Inspection, Testing and Certification 158 21A Inspection of Low Voltage Installations 159 21B Testing of Low Voltage Installations 160 21C Inspection of High Voltage Installations 165 21D Testing of High Voltage Installations 165 21E Points to be Noted by Registered Electrical Workers 166 21F Power Suspension Arrangement for Periodic Inspection, Testing and Certification (PITC) Work on Main Switchboard connecting to Power Company’s Transformer 168 22. Making and Keeping of Records 176 22A Keeping of Records by the Owner of an Electrical Installation that Requires Periodic Inspection, Testing and Certification 177 22B Making and Keeping of Records by a Registered Electrical Contractor 177 22C Types of Records 177 22D Checklists 178 23. (Reserved for Future Uses) 180 24. (Reserved for Future Uses) 180 6 7 Part II Page 25. General Workmanship 181 25A Wiring Installation Using Conduits 182 25B Wiring Installation Using Trunkings 184 25C Installation of Cables 185 25D Cable Joint and Cable Termination 188 25E Installation of Socket Outlets 192 26. Requirements for Specific Installations and Equipment 199 26A Domestic Installation and Appliance 202 26B Busbar Trunking Distribution System 208 26C Electric Motor 210 26D Supply Connection to Transformers 211 26E Supply Connection to Welding Sets 212 26F Installation of Fluorescent and Gaseous Discharge Lamps 212 26G Installation of Category 3 Circuits 212 26H High Voltage Discharge Lighting Installation (Neon Signs) 212 26I Lightning Protection Installation 216 26J Rising Mains Installation 216 26K Temporary Supply Installation for Construction and Demolition Sites or Repair and Testing Purposes 217 26L Hot Air Saunas Installation 220 26M Swimming Pools and Fountains Installation 222 26N Installation in Restrictive Conductive Locations 228 26O Installation of Equipment Having High Earth Leakage Currents 230 26P Renewable Energy Power System 233 26Q Temporary Electrical Installation for Exhibitions, Shows, Stands and Festive Lighting 237 26R Electric Heating Systems installed in Building Structures 239 26S Charging Facilities for Electric Vehicles 239 26T Installation for Modular Integrated Construction 242 8 Page Appendices 259 1. (Reserved for Future Uses) 260 2. (Reserved for Future Uses) 260 3. (Reserved for Future Uses) 260 4. (Reserved for Future Uses) 260 5. Rating Factors for Sizing of Cable Conductors 260 6. Current Carrying Capacities and Voltage Drop Tables for PVC Insulated and XLPE Insulated Cables 266 7. Typical Methods of Installation of Cables 284 8. Graphical Symbols for Electrical Diagrams 288 9. (Reserved for Future Uses) 296 10. Degree of Protection Provided by Enclosures (IP Code) 296 11. Forms of Internal Separations for Switchgear Assemblies 298 12. (Reserved for Future Uses) 300 13. Sample of Schedule of Test Results for Electrical Wiring and Checklists 301 14. References 337 15. Safety for Live Work 345 16. Sample of Permit-To-Work / Sanction-For-Test 348 17. Sample of HV Enclosure Log Book / HV Padlock Movement Log Book 352 18. New Cable Colour Code for Fixed Electrical Installations- Installation Guidelines 354 Index 362 8 9 10 ACKNOWLEDGEMENT The Electrical and Mechanical Services Department of the Government of the Hong Kong Special Administrative Region of the People's Republic of China would like to express gratitude to the organizations listed below for their kind permission to reproduce materials from their copyright publications: • British Standards Institution (BSI) • The Institution of Engineering and Technology (IET) (as the joint copyright holder with BSI for BS 7671—Requirements for Electrical Installations. IET Wiring Regulations) • International Electrotechnical Commission (IEC) The organizations listed above retain the copyright on the reproduced materials which may not be reproduced without the prior written permission from the organizations. Permission to reproduce extracts from BS 7671:2018 is granted by the Institution of Engineering & Technology (IET) and BSI Standards Limited (BSI). No other use of this material is permitted. Information extracted from International Standards of IEC are copyright of IEC, Geneva, Switzerland. All rights reserved. Further information on the IEC is available from www.iec.ch. Copies of the complete standards listed above are available for sale from the respective organizations. The addresses of the organizations are: • British Standards Institution: 389 Chiswick High Road, London, W4 4AL, United Kingdom • The Institution of Engineering and Technology: Michael
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