: Issue an Electrical Installation Certificate (EIC) upon completion to confirm the work meets current standards.

: Standardizes terminology for consistent interpretation.

: Covers supply types, earthing arrangements (e.g., TT, TN-S, TN-C-S), and bonding.

This guide outlines the essential requirements of , the UK’s national standard for electrical installations, commonly known as the 18th Edition IET Wiring Regulations . As of April 2026, the standard includes major updates through Amendment 4 (2026) , which introduces critical requirements for modern technologies like battery storage and Power over Ethernet (PoE). Core Structure of BS 7671

: Review the latest version of BS 7671 and its On-Site Guide .