Amendment 4 to BS 7671 becomes the only current version of the Wiring Regulations today (15 October). Here’s what that means for designs and contracts already under way
The previous version of the 18th Edition IET Wiring Regulations, BS 7671:2018+A2:2022+A3:2024, has been withdrawn as a British Standard. Amendment 4:2026, published in April, is now the only current version.
Here’s what the withdrawal means – and doesn’t mean – for electrical contractors, and what to do next.
New installations
A new installation from today must comply with the new regulations introduced by Amendment 4.
Jobs already under way
According to trade body SELECT, an installation under construction that was designed to the previous version may continue to be erected and can be verified to that standard, subject to the contractual arrangements agreed.
So, whether you can finish a live job to the old version depends on what your contract says. If you’re unsure where a project stands, check with your client, designer or trade body, and get any decision in writing.
What it doesn’t mean
An installation built to an earlier version is unlikely to comply fully with the latest one, but that doesn’t make it unsafe or mean it must be upgraded.
What’s new in Amendment 4
- Batteries: a new Chapter 57 covers stationary secondary batteries, with more than 18 new regulations.
- Power over Ethernet (PoE): a new Section 716 limits SELV and PELV supplies to 60 V ripple-free DC in dry locations and 15 V elsewhere.
- ICT earthing: a new Section 545 covers functional earthing and bonding for ICT equipment.
- Medical locations: Section 710 has been significantly revised.
- EICRs: a new requirement means reports must be based on the revised model in Appendix 6.
What to do now
- Check which version your live contracts and specifications refer to;
- Get a copy of Amendment 4, identifiable by its orange cover;
- Update designs, certificates and report templates. Appendix 6 has minor changes to the EIC and MEIWC forms and major changes to the EICR;
- and brief your team before the next job starts.
ECN will be explaining the main changes over the coming weeks. Visit our Amendment 4 hub or send your questions to will@allthingsmedialtd.com.
