Login
Start of main content
IET Equals Graphic

IET Electrical Excellence

Setting standards for electrical installation

What's new?

BS 7671:2018+A4:2026, IET Wiring Regulations 18th Edition, Requirements for Electrical Installations

The national standard for electrical installation. Built for progress. Backed by standards.

Buy your copy today.

Go to BS 7671 - 18th Edition Wiring Regulations

Supporting publications

Book

On-Site Guide (BS 7671:2018+A4:2026), 9th Edition

The On-Site Guide is an essential guide to BS 7671. It incorporates the extensive changes to BS 7671, making this a vital guide for keeping up to date.

Buy your copy today!

Go to

Book

Guidance Note 3: Inspection & Testing, 10th Edition

Guidance Note 3: Inspection & Testing is a fundamental guidance book for all those involved with the testing and inspection of electrical installations. It also contains essential guidance for those studying for inspection and testing qualifications

Buy your copy today!

Go to

Digital Wiring Regulations

Subscribe to e-book packages of BS 7671 and guidance for content that is always updated to the latest version.

Go to https://electrical.theiet.org/bs-7671/18th-edition-resources/digital-subscriptions-to-bs-7671-and-iet-guidance/

Get the complete A4:2026 guidance set

The Orange Book is supported by a suite of updated guidance publications, all aligned to BS 7671:2018+A4:2026.

From the On-Site Guide to the full Guidance Notes series, everything you need to work to the new standard will be released over the coming months.

Browse all BS 7671:2018+A4:2026 publications

Go to Amendment 4:2026 to BS 7671:2018 IET Wiring Regulations

Featured resources

Browse the bookshop

Browse our range of BS 7671 and guidance titles, Codes of Practice and books for electrotechnical students.

Go to Guidance & Codes of Practice

Forms and downloads

A collection of forms, checklists and downloads for IET publications outside of the core BS 7671 model forms.

Go to Forms and downloads

Model forms for BS 7671

Download PDFs of the certification and reporting forms, as listed in BS 7671 and Building Regulations Part P, (also called Test Certificates or Forms of Reporting).

Go to Model Forms

Helping industry

Wiring Matters

Our free-subscription online magazine provides technical articles and updates on important changes within industry.

Go to Wiring Matters

Take the next step with Electrician EngTech

If you want to stand out to employers, to your colleagues and your clients, Electrician EngTech is for you.

Go to Electrician EngTech and Professional Registration

Technical support

Our electrical engineers are here to help you with your queries on BS 7671.

Go to Technical support

In-company training course

Our wiring regulations' experts will come to your premises and deliver updates and training that meet your particular requirements.

Go to

Have your say

Electrical forum

Join in for discussions on everything electrical, get advice or share your expertise.

Go to Forums

Get involved

Have your say on our upcoming titles, join a technical committee or commission a Code of Practice in your area.

Go to Get involved

Find out more

FAQs

Find answers to the top questions that we get asked on our technical helpline.

Go to FAQs