The 18th Edition IET Wiring Regulations (BS 7671:2018 + Amendment 4), known as the 'orange book', is the latest version of the UK standard for electrical installations.
Published by the Institution of Engineering and Technology (IET), this book is used across the industry as the recognised reference for:
- Electrical design
- Installation work
- Inspection and testing
- Ongoing maintenance
Latest Update
Amendment 4:2026 brings updates on stationary batteries, functional earthing for ICT systems, Power over Ethernet, and a major revision of medical location rules, including bonding tests. From 15 April 2026, it is essential for all relevant professionals to have a copy for compliance.
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Frequently Asked Questions
Q1. What is the 18th Edition Orange Book?
The Orange Book is the latest version of BS 7671 (Amendment 4:2026). It's the UK standard used as a reference for electrical installation, inspection, and testing work.
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Q2. Who is this book for?
This book is intended for anyone involved in electrical installations, including electricians, inspectors, designers and maintenance teams.
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Q3. Is this book required for the 18th Edition course?
Yes, this is the main reference used during the City & Guilds 2382-26 course and exam.
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Q4. Why is this book important?
This book sits at the centre of electrical work in the UK. It's widely used to meet the Electricity at Work Regulations 1989.
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Q5. How is this book used?
The 18th Edition IET Wiring Regulations book is used as a reference guide on-site to look up regulations, check installation requirements, and support inspection and testing. It's also used during the 18th Edition exam as an open-book resource.
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Q6. When do I need to start using this version?
This edition was published in April 2026 and becomes the current standard from October 2026. The previous version, often known as the "Brown Book" will no longer be the current standard after this date.
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