practical electrical wiring standards - iee bs7671:2008+a1:2001 edition

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Practical Electrical Wiring Standards –

IEE BS7671:2008+A1


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


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


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


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


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


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


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


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


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


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


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


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


Appendices to the RegulationsAppendix 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


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 Equipment2. Isolation and Switching3. Inspection and Testing4. Protection against Fire5. Protection against Electric Shock

6. Protection against Over current

7. Special Locations

8. Earthing and Bonding


Harmonised StandardA 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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practical electrical wiring standards - iee bs7671:2008+a1:2001 edition

Engineering

offshore installations

regulationsthe regulations

exclusionsthe regulations

protection of conductors

selection of surge protection

quarry equipment

equipment andsystems

nominal voltage