18th edition Amendment 4 (2026): What Just Changed and What You Need to Do Before OctoberÂ
Amendment 4 is not the 19th Edition. It's not live today. And you don't need to panic about immediate compliance. But you do need to understand what's changed and what you must do before 15 October 2026 when the current regulations get withdrawn and A4 becomes mandatory for all new work. Here's what you need to know right now: Amendment 4 introduces five major new chapters and sections covering battery storage systems, Power over Ethernet installations, functional earthing for ICT systems, low-voltage generators, and energy efficiency design frameworks. These changes affect domestic solar installers, commercial electricians working in smart buildings, EICR testers inspecting renewable installations, and anyone working on backup power systems.Â
