Corrigendum to the 18th Edition Wiring Regulations

[edit] 2026 Amendment 4

The 2026 Amendment 4 is to be implemented immediately when published on 15th April 2026 and the previous version, BS 7671:2018+A2:2022+A3:2024, will be withdrawn six months later.

[edit] The corrigendum

The Institution of Engineering and Technology (IET) and BSI published a Corrigendum to the 18th Edition Wiring Regulations (BS 7671:2018+A2:2022).

ECA has welcomed the changes and corrections in the Corrigendum, which help to clarify the requirements of the 18th Edition (BS 7671:2018+A2:2022) and the intent behind the Regulations.

The Corrigendum makes changes to several areas of BS 7671 and comes into effect immediately. It is available for free to download from the IET and BSI by clicking here.

ECA advises electrotechnical and engineering services contractors to note in any relevant documentation that they are completing projects to this Corrigendum, to avoid any confusion going forward.

[edit] Comment

Gary Parker, Senior Technical Manager at ECA, said:

“This corrigendum introduces several small, but very important, changes to the Wiring Regulations which ECA Members and the wider industry need to be aware of. Among these is a change to protected escape route requirements, SPD requirements, and a brand-new regulation relating to protected escape routes for medical locations.

"ECA's dedicated Technical Team will provide further detailed information for ECA Members, including a breakdown of the changes and what Members can do to stay compliant.”

ECA’s industry-leading Technical Team offers unrivalled support across a wide range of electrotechnical activities. ECA Members can access exclusive application guides, editable certificates, guidance notes, technical bulletins, and access to the ECA Technical Helpline.

Learn more about ECA Technical support, including support with AMD2 and the 18th Edition, here.

[edit] Changes

Areas of change include:

• Regulation 422.2 has been amended to clarify the scope of the provision.
• Indent (ii) of Regulation 443.4.1 has been removed. The term safety service, formerly included in Regulation 443.4.1 (ii), encompassed a wide range of systems. The provision, therefore, had unintended consequences for improvements to fire safety systems within installations.
• Table 443.2 and the Note to Regulation [IP address hidden] have been amended to remove examples of equipment.
• Regulation 701.1 has been amended to remove the reference to birthing pools.
• A new Regulation, [IP address hidden], has been included in order to modify requirements in Regulation group 422.2 for protected escape routes in healthcare facilities.

For more information on the Corrigendum and all things BS 7671:2018, please visit: www.theiet.org/updates.

This article was issued via Press Release as "ECA welcomes Corrigendum to 18th Edition Wiring Regulations", and also available from the ECA News and blog site, dated May 15.

--ECA

[edit] Related articles on Designing Buildings

• 18th Edition Wiring Regulations.
• BS 7671 Requirements for Electrical Installations.
• Articles about electricity.
• ECA articles.
• Electrical equipment.
• Electrical installation.
• Electrical power.
• Electrical safety.
• Electrician.
• Electrotechnical Assessment Specification guidance for installers.
• IET announces release of 18th Edition Amendment 2.

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