17th Edition wiring regulations

Summary: Information on the IEE 17th Edition Wiring Regulations, the UK's most recent wiring regulation update, which came into force in 2008.

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BS 7671 (The IEE Wiring Regulations) are the national standard to which all domestic and industrial wiring must conform. The 17th edition contains substantial changes to align with European documents.

The IEE Wiring Regulations are produced by the Institution of Engineering and Technology (The IET). The IEE is an imprint of the Institution of Engineering and Technology and is used for all books related to the Wiring Regulations.

The 17th Edition of the IEE Wiring Regulations (BS 7671:2008) was published in January 2008, and will come into effect from the 1 July 2008.

From then on all commercial, domestic and industrial wiring installations must be designed, constructed, inspected, tested and certificated to meet the requirements of BS 7671: 2008. More information on this can be found on the esc.org.uk website

Guidance on the Application of the Requirements of 17th Edition IEE regulations

The technical guidance concerning the application of the requirements of BS 7671: 2008 (IEE Wiring Regulations 17th Edition) given in this section of the website has been discussed and agreed by a forum comprising technical representatives from the following bodies, hosted by the Electrical Safety Council: (further information on each body can be found on their respctive websites detailed below)

In each instance, depending on the type of work and area that the work is going to take place in and the type of premises the work is going to be carried out on, will depend on what restrictions apply. For additional information and guidance please select from below the instance that best suits your situation.

ND New or rewired domestic and similar installations
ED Alterations and Additions in Domestic and Similar Premises
WN Places of Work – New installations
PD Periodic Inspection of Existing Domestic and Similar Installations

Please note that neither the Electrical Safety Council nor the forum is able to respond directly to technical questions from individuals. Electrical contractors and installers seeking technical advice on the application of the requirements of the 17th Edition should contact their registration or trade body in the first instance.If the registration or trade body wishes to establish a consensus of opinion, they may refer the question to the forum for consideration. If the forum is able to agree on an appropriate answer, it will be added to the question and answer section below.

The answers provided by the forum in this section of the website assume that the designer and installer intend to comply fully with the requirements of the 17th Edition. All new and rewired installations designed after 30 June 2008 are, without exception, required to comply fully with the requirements of the 17th Edition.Where exceptionally, after that date, designers and/or installers decide to adopt alternative approaches for alterations and additions to existing installations, they must be recorded as departures from the current standard in the box provided for the purpose on electrical installation certificates based on the model form given in the 17th Edition. Where such an alternative approach is taken, the designer and/or installer as appropriate must be prepared to justify the decision, and the resulting degree of safety of the installation must not be less than that obtained by compliance with the 17th Edition.

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