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The landscape of electrical installations is evolving, and the standards are moving with it. The Institution of Engineering and Technology (IET) and the British Standards Institution (BSI) have officially signed off on the content for Amendment 4 to the 18th Edition of the IET Wiring Regulations (BS 7671:2018).
Scheduled for publication on 15 April 2026, this amendment introduces critical updates reflecting the industry’s shift toward smarter technology and sustainable energy storage.
Amendment 4 is more than a minor tweak; it addresses the integration of modern digital infrastructure and green energy solutions. The most significant additions include:
Stationary Secondary Batteries: A brand-new chapter dedicated to electrical storage and supply systems, ensuring the safe installation of battery technology for commercial and industrial use.
Power over Ethernet (PoE): New regulations to govern the delivery of power via data cabling, reflecting the rise of smart building tech and connected devices.
ICT Infrastructure: Updated sections on functional earthing and equipotential bonding specifically tailored for Information and Communication Technology systems.
As an EDIS user, staying compliant is central to your operational efficiency. These updates will impact how electrical certificates are generated and how installations are audited. Proactive preparation ensures that your team is ready to implement these changes the moment the amendment becomes active.
Mark Your Calendar: Ensure your technical leads are aware of the 15 April 2026 publication date.
Review Storage Projects: If your business is involved in UPS or renewable energy storage, familiarize yourself with the new chapter on secondary batteries.
Audit Your Data Systems: With PoE and ICT earthing updates, coordination between electrical and IT departments will be more critical than ever.
This new edition contains an extensive rewrite of Section 710. There is a new requirement in Regulation 710.643.1.201 (d). which says: –
The resistance of each individual supplementary bonding conductor shall be recorded and included in the documentation set out in regulation 710.514.9.101.
Diagrams and documentation required to satisfy the requirements: REFER: 710.514.9 Diagrams and documentation. 710.514.9.101 STATES Plans of the electrical installation together with records, drawings, wiring diagrams and modifications thereto, shall be provided for the user.
Information provided shall include but not be limited to:
(a) overview diagrams showing the distribution system of the normal power supply and electrical safety service supply in a single-line representation;
(b) distribution board block diagrams showing switchgear and controlgear and distribution boards in a single-line representation;
(c) schematic diagrams of controls;
(d) the verification of compliance with the requirements of standards;
(e) functional description for the operation of the electrical safety service supply and of the safety power supply system;
(f) schematic drawing showing local supplementary equipotential bonding layout, location of the EBB and internal connections of the EBB; and
(g) record schedule and test data for the supp
(h) assessment to determine the number of supplementary equipotential bonding connection points in each medical location.
Critically, the test result must meet the requirement set out in Regulation 710.415.2.102 which is not to exceed 0.2Ω.
There is an existing requirement in Regulation 710.415.2.102 which requires a test to be carried out between simultaneous accessible exposed conductive parts where the test resistance shall not exceed 0.2Ω.
With this in mind, there is a model form is provided at Annexe B710 to record the test results.
NOTE: See also Regulation 710.65 Periodic inspection and testing.
Keep your compliance seamless. We will continue to update the EDIS platform to reflect these changes, ensuring your digital electrical certification remains accurate and up to date with BS 7671:2018+A4:2026.