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BS 7671:2018+A4:2026
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BS 7671:2018+A4:2026 Requirements for Electrical Installations. IET Wiring Regulations
standard byBSI Group , 04/15/2026
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What is BS 7671:2018+A4:2026 - Requirements for Electrical Installations IET Wiring Regulations about?
BS 7671, also known as the IET Wiring Regulations, is the UK’s national standard for the design, erection and verification of electrical installations.
It brings together European (CENELEC) Harmonized Documents and international standards (IEC) to provide a single, authoritative reference for safe, compliant electrical work across domestic, commercial and specialized environments.
Amendment 4:2026 introduces essential updates that reflect modern technologies including electrical energy storage, ICT systems and Power over Ethernet, ensuring installations meet today’s technical and safety expectations.
Who is BS 7671:2018+A4:2026 - Requirements for Electrical Installations IET Wiring Regulations for?
BS 7671 is directly relevant to:
Designers of electrical installations.Electrical contractors.Electrical installers.Inspectors and testers of electrical installations.Specifiers of equipment for electrical installations.Lecturers, those delivering courses, students and learners in the field of low voltage electrical installations.It is also highly relevant to manufacturers and suppliers of electrical equipment, such as cables, luminaires, sockets, consumer units and safety equipment. The standard is essential for anyone involved in the design, installation, inspection and testing of electrical systems in domestic, commercial and specialized environments.
With almost 50% of electrical installers planning to undertake solar, EV charging and heat pump installations, staying current with BS 7671 is how you lead in a fast-changing market.
What does BS 7671:2018+A4:2026 - Requirements for Electrical Installations IET Wiring Regulations cover?
BS 7671 covers the requirements for:
The design, erection, and verification of electrical installations.Safety requirements to prevent risks such as electric shock and fire.Installations at voltages up to 1000V AC and 1500V DC.A wide range of environments, including domestic and commercial buildings, swimming pools, highway equipment and solar photovoltaic power systems.Amendment 4:2026 specifically introduces:
A new chapter on stationary secondary batteries for electrical storage and supply.A new section on functional earthing and equipotential bonding for ICT equipment and systems.A new section on Power over Ethernet (PoE).A major revision of Section 710 (Medical Locations), including new requirements for recording resistance of supplementary protective equipotential bonding conductors.Incorporation of Amendment 3:2024 as part of the main document.Knowledge isn’t optional, it’s your edge. BS 7671 and its supporting guidance give you the confidence to deliver, win more work and lead in an evolving industry.
Why should you use BS 7671:2018+A4:2026 - Requirements for Electrical Installations IET Wiring Regulations?
Legal compliance: BS 7671 is the most widely accepted way to demonstrate compliance with UK electrical safety legislation, i.e. The Electricity at Work Regulations 1989.Industry recognition: It is the standard for electrical installations in the UK.Safety and risk management: Following the standard helps prevent electrical hazards, ensuring the safety of both installers, users and the public.Professional credibility: Compliance is required for Building Regulations of the devolved nations and is a mark of professionalism and competence.Future readiness: The standard supports the integration of new technologies and sustainable practices, underpinning the electrification needed to meet net zero ambitions.What's changed?
BS 7671:2018+A4:2026 supersedes BS 7671:2018+A2:2022+A3:2024, which will be officially withdrawn on 15 October 2026 but remains valid for six months after Amendment 4’s April 2026’s release.
The key changes introduced in this amendment include:
New requirements for stationary secondary batteries (electrical storage).New provisions for functional earthing and equipotential bonding for ICT systems.Introduction of Power over Ethernet (PoE) requirements.Major updates to medical locations, including enhanced testing and documentation.Incorporation of previous amendments and further alignment with CENELEC and IEC standards.