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Requirements for Electrical Installations BS 7671:2008 The IEE Wiring Regulations 17th Edition

. Presenter: Jon Elliott BSc (Hons) I Eng MIEESenior Engineer, IET. Representing:IET - Standards

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Requirements for Electrical Installations BS 7671:2008 The IEE Wiring Regulations 17th Edition

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    1. Requirements for Electrical Installations BS 7671:2008 The IEE Wiring Regulations 17th Edition

    2. Introduction

    3. Topics for today:

    4. A. Preamble

    5. B. The history of BS 7671

    6. B. The history of BS 7671

    7. B. The history of BS 7671

    8. B. The history of BS 7671

    9. B. The history of BS 7671

    10. C. Standardization

    11. C. Standardization

    12. C. Standardization

    13. C. Standardization

    14. C. Standardization

    15. D. BS 7671:2008

    16. D. BS 7671:2008

    17. D. BS 7671:2008

    18. D. BS 7671:2008

    19. D. BS 7671:2008

    20. D. BS 7671:2008

    21. Part 1 – Scope, Object and Fundamental Principles

    22. There are three Chapters in Part 1: Chapter 11 Scope Chapter 12 Object And Effects Chapter 13 Fundamental Principles PART 1 Scope, Object and Fundamental Principles

    23. Scope 110.1 GENERAL The Regulations apply to the design, erection and verification of electrical installations such as those of: PART 1 Scope, Object and Fundamental Principles

    24. PART 1 Scope, Object and Fundamental Principles Object and Effects 120.3 This Standard sets out technical requirements… Any intended departure…requires special consideration by the designer…The resulting degree of safety of the installation shall be not less than that obtained by compliance with the Regulations.

    25. PART 1 Scope, Object and Fundamental Principles Fundamental Principles 131.8 No addition or alteration, temporary or permanent, shall be made to an existing installation, unless…the rating and the condition of any existing equipment, including that of the distributor, will be adequate…. the earthing and bonding arrangements, if necessary for the protective measure applied for the safety of the addition or alteration, shall be adequate. 132.3 The number and type of circuits …knowledge of: (vi) anticipated future demand if specified. 132.13 Every electrical installation shall be provided with appropriate documentation… 134.1.1 Good workmanship by competent persons or persons under their supervision and proper materials …

    26. Part 2 – Definitions

    27. PART 2 Definitions The definitions used Part 2 are extracted from the IEC International Electrotechnical Vocabulary (IEV), Part 826 – IEC 60050. Where UK only terms are used in BS 7671, the definitions have been developed by JPEL/64. 223 terms are defined in the 17th Edition, whilst 151 are defined in the 16th!

    28. PART 2 Definitions Competent Person A person who possesses sufficient technical knowledge and experience for the nature of the electrical work undertaken and is able at all times to prevent danger, and where appropriate, injury, to him/herself and others. This definition is aligned with the Memorandum of guidance on the Electricity at Work Regulations 1989 (HS(R)25)

    29. PART 2 Definitions Basic Protection Protection against electric shock under fault-free conditions. Basic protection replaces the term Direct Contact Fault Protection Protection against electric shock under single fault conditions. Fault protection replaces the term Indirect Contact

    30. PART 2 Definitions Line conductor (replaces the term Phase conductor but definition unchanged) Exposed-conductive-part A conductive part of equipment which can be touched and which is not normally live but which can become live when basic insulation fails.

    31. Part 3 – Assessment of General Characteristics

    32. PART 3 Assessment of General Characteristics Part 3 is the starting point for: designing a new installation a major addition, or alteration to an existing installation

    33. PART 3 Assessment of General Characteristics There are six Chapters in Part 3: Four are existing: Chapter 31 Purpose, Supplies and Structure Chapter 32 Classification of External Influences Chapter 33 Compatibility Chapter 34 Maintainability Two are new: Chapter 35 Safety Services Chapter 36 Continuity of Service

    34. PART 3 Assessment of General Characteristics Chapter 35, Safety Services, requires that an assessment is made of any need for safety services, such as:

    35. PART 3 Assessment of General Characteristics Chapter 36, Continuity of Service, requires an assessment of any need for continuity of service: life-support systems

    36. PART 3 Assessment of General Characteristics 311 MAXIMUM DEMAND AND DIVERSITY 311.1 For economic and reliable design, the maximum demand of an installation shall be assessed. In determining the maximum demand….., diversity may be taken into account.

    37. PART 3 Assessment of General Characteristics Section 314 – Division of an Installation Was Installation Circuit Arrangement in 16th Edition. Now renamed Division of Installation. This emphasizes the need to split an installation into a suitable number and arrangement of circuits.

    38. Part 4 – Protection for Safety

    39. There are four Chapters in Part 4, trimmed down from nine: Chapter 41 Protection against electric shock Chapter 42 Protection against thermal effects Chapter 43 Protection against overcurrent Chapter 44 Protection against voltage disturbances and electromagnetic disturbances Many changes have occurred in Part 4, both technical and editorial. PART 4 - Protection for Safety

    40. PART 4 - Protection for Safety

    41. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock

    42. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock

    43. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock

    44. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 411 Protective Measure – Automatic disconnection of supply

    45. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 411 Protective Measure – Automatic disconnection of supply

    46. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 411 Protective Measure – Automatic disconnection of supply

    47. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 411 Protective Measure – Automatic disconnection of supply

    48. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 411 Protective Measure – Automatic disconnection of supply

    49. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 411 Protective Measure – Automatic disconnection of supply

    50. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 411 Protective Measure – Automatic disconnection of supply

    51. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 411 Protective Measure – Automatic disconnection of supply Additional protection

    52. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 411 Protective Measure – Automatic disconnection of supply Additional protection

    53. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 412 Double Or Reinforced Insulation

    54. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 413 Electrical Separation

    55. PART 4 - Protection for Safety Chapter 41 - Protection for against electric shock 414 ELV Provided by SELV or PELV

    56. Part 5 – Selection and Erection of Equipment

    57. There are six Chapters in Part 5: Chapter 51 Common rules Chapter 52 Selection and Erection of Wiring Systems Chapter 53 Protection, Isolation, Switching, Control and Monitoring Chapter 54 Earthing Arrangements and Protective Conductors Chapter 55 Other Equipment Chapter 56 Safety Services Part 5 –Selection and Erection of Equipment

    58. Part 5 –Selection and Erection of Equipment Chapter 51 - Common rules 514 Identification and Notices

    59. Part 5 –Selection and Erection of Equipment Chapter 52 - Selection and Erection of Wiring Systems 522 External Influences

    60. Part 5 –Selection and Erection of Equipment Chapter 52 - Selection and Erection of Wiring Systems 522 External Influences

    61. Part 5 –Selection and Erection of Equipment Chapter 52 - Selection and Erection of Wiring Systems 522 External Influences

    62. Part 5 –Selection and Erection of Equipment Chapter 52 - Selection and Erection of Wiring Systems 522 External Influences

    63. Part 5 –Selection and Erection of Equipment Chapter 52 - Selection and Erection of Wiring Systems 522 External Influences

    64. Part 5 –Selection and Erection of Equipment Chapter 52 - Selection and Erection of Wiring Systems 523 Current-Carrying Capacities of Cables

    65. Part 5 –Selection and Erection of Equipment Chapter 52 - Selection and Erection of Wiring Systems 525 Voltage Drop in Consumer’s Installations

    66. Part 5 –Selection and Erection of Equipment Chapter 54 - Earthing Arrangements and Protective Conductors 542 Earthing Arrangements

    67. Part 5 –Selection and Erection of Equipment Chapter 54 - Earthing Arrangements and Protective Conductors 543 Protective Conductors

    68. Part 5 –Selection and Erection of Equipment Chapter 55 – Other Equipment 551 Low Voltage Generating Sets

    69. Part 5 –Selection and Erection of Equipment Chapter 55 – Other Equipment 551 Low Voltage Generating Sets

    70. Part 5 –Selection and Erection of Equipment Chapter 55 – Other Equipment 551 Low Voltage Generating Sets

    71. Part 5 –Selection and Erection of Equipment Chapter 55 – Other Equipment 551 Low Voltage Generating Sets

    72. Part 5 –Selection and Erection of Equipment Chapter 55 – Other Equipment 559 Luminaires and Lighting Installations

    73. Part 6 – Inspection and Testing

    74. There are three Chapters in Part 6: Chapter 61 Initial Verification Chapter 62 Periodic Inspection and Testing Chapter 63 Certification and Reporting Part 6 – Inspection and Testing

    75. Part 6 – Inspection and Testing Chapter 61 – Initial Verification 612 Testing

    76. Part 6 – Inspection and Testing Chapter 61 – Initial Verification 612 Testing

    77. Part 6 – Inspection and Testing Chapter 61 – Initial Verification 612 Testing

    78. Part 7 – Special Installations or Locations

    79. There are fourteen Special Installations or Locations in Part 7: 701 Locations containing a bath or shower 702 Swimming pools and other basins 703 Rooms and cabins containing sauna heaters 704 Construction and demolition site installations 705 Agricultural and horticultural premises 706 Conducting locations with restricted movement 707 Not used (was Section 607, now in Chapter 54) 708 Electrical installations in caravan / camping parks and similar locations Part 7 – Special Installations or Locations

    80. There are fourteen Special Installations or Locations in Part 7: 709 Marinas and similar locations 710 Medical locations, reserved for future use 711 Exhibitions, shows and stands 712 Solar photovoltaic (pv) power supply systems 717 Mobile or transportable units 721 Electrical installations in caravans and motor caravans 740 Temporary electrical installations for structures, amusement devices and booths at fairgrounds, amusement parks and circuses 753 Floor and ceiling heating systems Part 7 – Special Installations or Locations

    81. Part 7 – Special Installations or Locations 701 Locations containing a bath or shower

    82. Part 7 – Special Installations or Locations 701 Locations containing a bath or shower

    83. Part 7 – Special Installations or Locations 701 Locations containing a bath or shower

    85. Part 7 – Special Installations or Locations 701 Locations containing a bath or shower

    86. Part 7 – Special Installations or Locations 701 Locations containing a bath or shower

    87. Part 7 – Special Installations or Locations 702 Swimming pools and other basins

    88. Part 7 – Special Installations or Locations 702 Swimming pools and other basins

    89. Part 7 – Special Installations or Locations 702 Swimming pools and other basins

    90. Part 7 – Special Installations or Locations 703 Rooms and Cabins Containing Sauna Heaters

    91. Part 7 – Special Installations or Locations 704 Construction and demolition sites

    92. Part 7 – Special Installations or Locations 704 Construction and demolition sites

    93. Part 7 – Special Installations or Locations 705 Agricultural and horticultural premises

    94. Part 7 – Special Installations or Locations 706 Conducting Locations with Restricted Movement

    95. Part 7 – Special Installations or Locations 708 Caravan/Camping Parks and Similar Locations

    96. Part 7 – Special Installations or Locations 709 Marinas and Similar Locations

    97. Part 7 – Special Installations or Locations 711 Exhibitions, shows and stands

    98. Part 7 – Special Installations or Locations 711 Exhibitions, shows and stands

    99. Part 7 – Special Installations or Locations 711 Solar Photovoltaic (pv) Power Supply Systems

    100. Part 7 – Special Installations or Locations 717 Mobile or transportable units

    101. Part 7 – Special Installations or Locations 717 Mobile or transportable units

    102. Part 7 – Special Installations or Locations 717 Mobile or transportable units

    103. Part 7 – Special Installations or Locations 740 Temporary Electrical Installations for Structures, Amusement Devices and Booths at Fairgrounds, Amusement Parks and Circuses

    104. Part 7 – Special Installations or Locations 75 3Floor and ceiling heating systems

    105. Part 7 – Special Installations or Locations 753 Floor and ceiling heating systems

    106. Appendices – 1-15

    107. There are fifteen Appendixes: British Standards - reference made in the Regulations 2. Statutory regulations and associated memoranda 3. Time/current characteristics of overcurrent protective devices 4. Current-carrying capacity and voltage drop for cables 5. Classification of external influences 6. Model forms for certification and reporting 7. Harmonized cable core colours 8. Current-carrying capacity and voltage drop for busbar trunking and powertrack systems 9. Definitions-Multiple source, d.c. and other systems 10. Protection of conductors in parallel against overcurrent 11. Harmonic currents in three-phase systems 12. Voltage drop in consumers’ installations 13. Methods for measuring insulation resistance of floors and walls 14. Measurement of fault loop impedance: increase of resistance of conductors with temperature 15. Radial and ring final circuit arrangements Appendices

    108. Thank you for listening Any questions?

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