Internationally there has been steady progress towards the harmonisation of electrical wiring standards. European standards are based on the international IEC 364 under the umbrella of Harmonisation Document HD 384. The format of these is reflected in the ETCI national rules ET 101: 2008 and the UK IEE wiring regulations BS 7671:2008. This workshop is designed to provide up to date information and training on the current edition of National Rules ET 101: 2008. It will consist of in-depth teaching on all aspects of the national rules and their application with many practical examples and sample design calculations. The workshop includes references to safety, maintenance, inspection and testing. In addition, it provides a summary of some of the basic principles necessary for a good understanding of electrical installation technology. WHO SHOULD ATTEND? Building services engineers Electrical apprentices Electrical design staff Electrical engineers Electrical trades persons Engineering managers Graduate electrical engineer trainees Maintenance and shutdown planning staff Maintenance managers Private electrical contractors MORE INFORMATION: http://www.idc-online.com/content/practical-electrical-wiring-standards-national-rules-electrical-installations-et-1012008-2

1. Practical Electrical
Wiring Standards –
IEE BS7671:2008+A1
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2. Course Objective
• Familiarising the participants with IET Wiring
Regulations 17th edition (referred to in this
course as the Regulations) and published as BS-
7671-2008 – Amendments 1 and 2
• Giving the participants an insight into the
reasoning behind the stipulations contained in the
Regulations
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3. Course Contents
• Overview of the Regulations
• Evolution of electrical distribution
systems
• System earthing and protective
earthing basics
• Planning of electrical systems
• Electrical safety
• Selection and erection of electrical
equipment
• Inspection and testing of installations
• Installations in special locations
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4. Need for Standards
• To ensure proper interfacing between equipment and
systems designed/ manufactured/installed by different
agencies. Standards contain stipulations on:
- Voltage and Frequency parameters and permissible
variations
- Sockets, connectors and other connection interfaces
used in equipment to ensure proper matching
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5. Objective of the Regulations
• To provide the rules for the design and erection of
electrical installations covered under its scope to
ensure safety and proper functioning of the
installation
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6. Installations Covered
The Regulations cover installations in:
 Industrial, commercial, residential, agricultural/horticultural
premises
 Prefabricated buildings and caravans
 Temporary installations such as those encountered in
construction sites, exhibitions, fares, etc.
 Highway power supplies and outdoor lighting installations
 Medical locations
 Operating and maintenance gangways
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7. Scope of the Regulations
The Regulations cover the following:
 Circuits supplied at nominal voltage up to and
including 1000 V AC or 1500 V DC
 Circuits of over 1000 V AC when derived from an
installation of less than 1000 V AC
 Wiring and cabling systems
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8. Scope of the Regulations
 All consumer installations external to the building
 All fixed and External wiring requirements for
communication and information technology systems
 Additions and alterations to existing installations
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9. Exclusions
The Regulations exclude:
 Distributor’s Works
 Railway traction, rolling stock and signaling systems
 Motor vehicles and equipment on board ships, off
shore installations and aircraft
 Mines and Quarry equipment covered by other
statutory regulations
 Lightning protection installations on buildings
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10. Content of the Regulations
Part 1: Scope, Object and Fundamental
Principles
Part 2: Definitions
Part 3: Assessment of General characteristics
Part 4: Protection for Safety
Part 5: Selection and Erection of Equipment
Part 6: Inspection and Testing
Part 7: Special Installations
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11. Amendments to the Regulations
There are a total of sixteen appendices to the regulations
dealing with the following topics.
Appendix 1
British Standards to which reference is made
Appendix 2
Statutory regulations and associated memoranda
Appendix 3
Time/current characteristics of over current protective
devices
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12. Appendices to the Regulations
Appendix 4
Current-carrying capacity and voltage drop for cables and
flexible cords includes former Appendices 11 and 12
Appendix 5
Classification of external influences
Appendix 6
Electrical Installation Certificate and Periodic Inspection
Report forms
Appendix 7 (added in Amendment 2)
Harmonized cable core colors
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13. Appendices to the Regulations
Appendix 8
Current-carrying capacity and voltage drop for busbar trunking
and powertrack systems
Appendix 9
Definitions - multiple source, DC and other systems
Appendix 10
Protection of conductors in parallel against overcurrent
Appendix 11
Now Blank for future use
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14. Appendices to the Regulations
Appendix 12
Now Blank for future use
Appendix 13
Methods for measuring the insulation resistance/impedance of
floors and walls to Earth or to the protective conductor system
Appendix 14
Measurement of earth fault loop impedance:
consideration of the increase of the resistance of conductors with
increase of temperature
Appendix 15
Ring and radial final circuit arrangements
Appendix 16
Selection of Surge Protection Devices
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15. Guidance Notes to the Regulations
The IET has published a series of eight Guidance Notes to
aid users of the Regulations
These are:
1. Selection and erection of Equipment
2. Isolation and Switching
3. Inspection and Testing
4. Protection against Fire
5. Protection against Electric Shock
6. Protection against Over current
7. Special Locations
8. Earthing and Bonding
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16. Harmonised Standard
A Harmonised Standard is one which has been drawn up by common
agreement between national standards bodies notified to European
Commission by all member states and published under national procedures
– The Wiring Regulations since the 15th Edition have been based on IEC 60364
and Cenelec (CLC) 60364.
– The 17th edition saw adoption of IEC numbering system, in which the
component parts of a Regulation number are separated by a decimal point, as an
aid to implementing changes to the requirements given in the International (IEC)
and European (Cenelec) base documents
– A number of requirements contained in BS 7671 are particular to the United
Kingdom. To show where this is the case, a ‘100’ component has been
introduced to the numbering system. For example, Regulation 522.2.100.
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17. DO YOU WANT TO KNOW MORE?
If you are interested in further training or information,
please visit:
http://idc-online.com/slideshare
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