IET Wiring Regulations – 18th Edition (BS 7671:2018) including Amendment 4 (A4:2026)

BS 7671 Amendment 4 (A4:2026) Update Course

This course gives learners a clear, practical understanding of BS 7671:2018 updated to Amendment 4 (A4:2026), focusing on what’s changed and how to apply the requirements when designing, selecting, erecting, inspecting and testing low-voltage electrical installations in the UK.

Amendment 4 (A4:2026) was published on 15 April 2026, and the previous version remains valid for a transition period until 15 October 2026.
Key additions/revisions in A4 include stationary secondary batteries, functional earthing & functional equipotential bonding for ICT systems, Power over Ethernet (PoE), and a major revision of Section 710 (Medical Locations) (including updated recording of certain test results).

Key facts

• Format: Classroom or live online (tutor-led)

• Typical duration: 1 day (Update/Refresher) or 2 days (Full coverage)

• Level: Professional / industry standard update

• Recommended for: Electricians, supervisors, inspectors/testers, facilities & maintenance teams, EV/renewables installers, and anyone responsible for compliance and certification

Entry requirements

Update/Refresher (1/2 day): Learners should already have good working knowledge of BS 7671 (18th Edition).
Full course (2 days): Suitable for learners who need a structured walk-through of BS 7671 including A4:2026.

Learning outcomes

By the end, learners will be able to:

1. Navigate BS 7671 confidently (Parts, Chapters, Sections, Appendices).

2. Identify and interpret the key A4:2026 changes and where they sit in the book.

3. Apply requirements to typical domestic and commercial scenarios (selection, protection, earthing/bonding, verification).

4. Understand documentation expectations: certification, schedules, and recording test results (including updated requirements in medical locations).