BS761:2018+A4:2026, known as the IET Wiring Regulations 18th Edition or the orange book, is the UK's authoritative guide for safe electrical installations in domestic commercial and industrial settings.
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 professionals to have a copy to remain industry compliant.
There has been a recent update to the 18th Edition BS 7671+A4:2026 IET Wiring Regulations. For more information click here.
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