BS 7671:2018+A4:2026 IET Wiring Regulations Latest Amendment 4 Edition
The IET Wiring Regulations, also known as BS 7671, are the recognised standard for electrical installations in the UK. This essential publication is used by electricians, contractors, inspectors and engineers involved in the design, installation, testing and maintenance of electrical systems across domestic, commercial and industrial settings.
The latest Amendment 4:2026 delivers important updates to the Eighteenth Edition, helping professionals stay compliant with current safety requirements and modern technologies. The consolidated version, BS 7671:2018+A4:2026, brings together all previous amendments into one complete and easy to reference guide.
This updated edition reflects the increasing demand for energy efficiency, digital infrastructure and specialised environments. It is an essential resource for anyone responsible for ensuring electrical installations meet the latest regulations and industry expectations.
Key Features:
- Covers the current UK electrical installation standard BS 7671:2018+A4:2026
- Includes new guidance on stationary secondary batteries for energy storage
- Introduces functional earthing and equipotential bonding for ICT systems
- New section covering Power over Ethernet installations
- Major revision of Section 710 relating to medical locations
- Includes a schedule of test results for recording bonding conductor resistance
- Fully consolidated publication including all previous amendments
Suitable for a wide range of electrical professionals, this edition supports safe working practices and helps ensure full compliance with the latest wiring regulations.