BS 7671 Update Confirmed: Amendment 4 (The Orange Book) Available from April 2026

The IET has confirmed that Amendment 4:2026 to BS 7671 (the 18th Edition Wiring Regulations) will be published on 15 April 2026. Known as the Orange Book, the update introduces key changes reflecting modern electrical installations, including new requirements for battery energy storage systems, Power over Ethernet (PoE), functional earthing for ICT systems, and revised rules for medical locations. The amendment can be implemented immediately from publication, with the current standard remaining valid until October 2026.