01_FV2_Introduction & Structure of BS 7671

17th Edition Wiring Regulations Version 1.0 Sept 2007 © NICEIC Group 2007

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C & G 2382-10 Level 3 Certificate in Requirements for Electrical Installations

BS 7671: 2008, the IEE Wiring Regulations, is the definitive standard for the electrical industry in respect of safe use and operation of electrical equipment and systems. They set the requirements and operating criteria for the UK and correspond to Harmonized standards.

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Chapter 61. Click to insert text here


C & G 2382-10 – Level 3 Certificate in Requirements for Electrical Installations

• This qualification is primarily aimed at practising electricians with relevant experience and other allied professionals e.g. surveyors, consultants and other trades needing to update and enhance their understanding of IEE Wiring Regulations. It may also be suitable for anyone requiring an understanding of BS 7671.

• It is intended to ensure that individuals are conversant with the format, content and the application of the Requirements for Electrical Installations BS 7671: 2008 (17th edition).

• City & Guilds 2382-10 examination consists of 60 multi-choice questions covering all sections of BS 7671 (7 parts and 15 Appendices)

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Why are Regulations changed/updated?

The main use of electricity was originally for street lighting replacing gas systems. It then progressed into the home (the first homes had

their own generators)

Progressively more electrical equipment/appliances were used in the home and at work.

Technological advancements also result in regulation changes, for example:

- Rewireable fuses to circuit-breakers - Wider use of RCDs- Introduction of solar panels, wind turbines and CHP units

and then there’s HARMONIZATION!

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Background to Harmonization

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BS 7671: 2008 is a British Standard

Requirements for Electrical Installations

• also known as the IEE Wiring Regulations (17th Edition)

• UK’s National Standard for electrical installation work,

• Wiring Regulations were first published back in 1882

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Relationship with Statutory Regulations

BS 7671 is non-statutory, but it may be

used in a court of law in evidence to

claim compliance with a statutory

requirement

The relevant statutory provisions are listed in Appendix 2 of BS 7671.

(Refer to Appendix 2)

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Relationship with Statutory Regulations

It should also be noted that BS 7671 is referred to in the Electricity Safety, Quality and Continuity Regulations 2002 as being an acceptable standard which will satisfy those statutory Regulations.

Additionally, the Health and Safety Executive considers compliance with BS 7671 is likely to achieve conformity with the relevant parts of the Electricity at Work Regulations 1989.

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The structure of BS 7671: 2008

BS 7671 contains seven Parts and fifteen Appendices

Each Part, except one, contains Chapters

Each Chapter contains Sections

Each Section contains individual (or groups of) Regulations

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The 7 Parts of BS 7671: 2008

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 or locations

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The (New) Numbering System

Now uses an all-new point/dot numbering system, based on the IEC numbering system

i.e. Dashes replaced, and zeros have been dropped.So …

16th Edition

Regulation522-06-06

17th Edition

Regulation522.6.6

Is now

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The (New) Numbering System explained

1st digit still signifies a Part (of BS 7671),

2nd digit is a Chapter (the second one of Part 5),

3rd digit is a Section (the fourth of Chapter 52 (five-two), &

the subsequent number(s) are the Regulation (or group of Regulation) number(s)

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Example use of Numbering System (524.1)

Selection and erectionof equipment

Selection and erection of wiring systems

Cross-sectional area of conductors of cables

Cross-sectional area of each conductor in an AC and/or DC circuit

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Exercise: Numbering System

(1) What is the Part, Chapter, Section and Regulation Group within the following Regulation number?

Regulation 521.9.3

(2) What does the Regulation relate to?

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Answer to Exercise

Regulation 521.9.3

‘A flexible cable or flexible cord shall be used for fixed wiring only where the relevant provisions of these Regulations are met.’

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Regulation numbering system in Part 7

Numbering system for Special installations or locations differs slightly …

The numbers appearing after a Section number generally refers to the corresponding Chapter, Section or Regulation within Parts 1 to 6 or another Chapter, Section or Regulation within Part 7.

The numbering system does not, therefore, always follow sequentially.

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Example use of Numbering System in Part 7

Regulation 701.415.2

Relates to Supplementary equipotential bondingin a location containing a bath or shower

How?

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Regulation numbering system

Regulation (701) indicates the Regulation is in Section 701 – Locations containing a bath or shower (which is in Part 7 Special installations or locations).

The following numbers in the Regulation (415.2) point us to Regulation 415.2, which is located in Part 4 (Additional protection: Supplementary equipotential bonding).

As a result, Regulation 701.415.2 relates to supplementary equipotential bonding within a location containing a bath or shower.

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Exercise: Numbering System in Part 7

(1) What is the Part, Chapter, Section and Regulation Group within the following Regulation number?

Regulation 701.753

(2) What does the Regulation relate to?

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Answer to Exercise

Regulation 701.753

Relates to electric floor heating systems in a location containing a bath or shower.

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Appendices

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Final Exercise: Structure of BS 7671

1. How many Parts are there in BS 7671?

2. How many Appendices are there in BS 7671?

3. What Part of BS 7671 relates to Special installations or locations?

4. What does Part 4 of BS 7671 relate to?

5. What section provides the requirements relating to construction and demolition site installations?

6. What does Appendix 5 relate to?

Documents

01_FV2_Introduction & Structure of BS 7671