IET Wiring Regulations, 18th Edition, BS 7671:2018+A4:2026

The IET Wiring Regulations is the national standard for electrical installations in domestic, commercial and industrial settings. It is the essential standard for all those concerned with the design, installation, certification and maintenance of electrical installations. Amendment 4:2026 is a major update to BS 7671:2018, The IET Wiring Regulations, Eighteenth Edition.

BS 7671:2018+A4:2026 is a consolidated publication which incorporates all previous amendments to the standard.

New inclusions within BS 7671:2018+A4:2026 are: Stationary Secondary Batteries where the purpose is for electrical storage and supply of electrical installations; Functional earthing and functional equipotential bonding for information and communication technology (ICT) equipment and systems; a new section on Power over Ethernet (PoE) and a major revision of Section 710 Medical Locations and the inclusion of a schedule of test results for recording the resistance of supplementary protective equipotential bonding conductors.

From 15th April 2026 you will need to have a copy of BS 7671:2018+A4:2026, known as 'the orange book'.

For those wishing to also purchase the IET Guidance Note 3 (10th Edition) and IET On-site Guide (9th edition), all three books can be purchased as a bundle at a collectively reduced price of £190.

This publication is required for the following courses:

• 2382-22 18th Edition;
• 2391-52 Initial Verification and Inspection & Testing
• 2396 Design & Verification of Electrical Installations
• 2921-31 Electric Vehicle
• 600/5175/9 Installation of Small Scale Photovoltaic System
• 603/3939/9 Requirements for the Installation of Electric Vehicle Charging Points
• Awareness Day for Amendment 2 to Wiring Regulations BS 7671
• Basic Cable Calculations

This publication is also recommended for reference on the following courses:

• Certification & Reporting (Form Filling)