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IET Wiring Regulations 18th Edition Amendment 4

Everything you need to know 

The release of the IET Wiring Regulations 18th Edition Amendment 4 (BS 7671:2018+A4:2026) represents a major step forward for the electrical industry. This is to come into effect on 15 April 2026 which sets the current standard for all electrical installations and testing, with the previous edition being withdrawn after six months.

Amendment 4 reflects the evolving demands of modern electrical systems, ensuring installations remain safe, compliant, and aligned with new technologies.

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What Does This Mean?

Amendment 4 introduces key updates that directly impact everyday electrical work, helping ensure safer, more efficient, and future ready installations.

Key changes in Amendment 4

  1. New ICT earthing requirements
    Introduction of specific rules for functional earthing in ICT systems, improving safety in modern digital installations.
  2. Battery storage regulations (Chapter 702)
    Dedicated requirements for stationary battery systems, covering installation, protection, and testing.
  3. Power over ethernet (PoE) guidance
    Clearer guidance on the safe installation and use of PoE systems in commercial and smart buildings.
  4. Low voltage generating sets
    New and updated requirements for generators and backup power systems within installations.
  5. Energy efficiency updates
    Increased focus on energy efficient design, including new frameworks to support sustainable installations.
  6. Changes to medical locations
    Revised requirements to ensure higher safety standards in healthcare environments.
  7. Firefighters’ switch updates
    Amendments to improve safety and accessibility of emergency switching systems.
  8. Inspection & testing revisions
    Updates to periodic inspection procedures, ensuring installations remain compliant over time.

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Get your 18th Amendment 4 Publications from bew

A wide range of supporting publications are available to help you stay compliant and informed:

Part No Description RRP
PIETREG184 Wiring Regulations Amendment 4 £125
PIETOSG184 On-Site Guide £40
PIETGN3184 Guidance Note 3 £46
LDREG184 Chapter Flags £10.70
PBUN1184 Regs, OSG & Flags Bundle £165
PBUN2184 Regs, OSG, GN3 & Flags Bundle £210

These publications provide essential guidance for understanding and applying the latest regulations in practice.

Get in touch with your local branch to get yours!

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Do you need to update your qualification?

If you already hold the 18th Edition qualification, you won’t need to retake the full course. However, it’s essential to update your knowledge in line with Amendment 4 to ensure you remain compliant with the latest wiring regulations.

Keeping your knowledge up to date helps demonstrate:

  • Ongoing professional competence
  • Safe and compliant working practices
  • Awareness of current installation methods
  • Compliance with regulations such as EAWR 1989

If you haven’t yet achieved your 18th Edition qualification, it remains a fundamental requirement for anyone working on electrical installations so it’s important not to delay getting certified.

When do electricians need to comply? 

Amendment 4 comes into effect from 15 April 2026. Following a six month transition period, the previous edition will be withdrawn, making this the new standard for compliance.

This applies to:

  • New low voltage installations
  • Additions and alterations
  • Periodic inspection and testing

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Get in Touch

At BEW Electrical Distributors, we’re here to support your business with the latest regulations, publications, and training opportunities. Whether you need guidance on Amendment 4 or want to order your copies, our team is ready to help.

Contact your local BEW branch today or speak to our team to ensure you stay compliant with the latest IET Wiring Regulations.

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FAQ’s 

When is BS 7671 Amendment 4 being released?

It will be published on 15 April 2026.

How long is the transition period?

Six months — the current version will be withdrawn after this period.

Is Amendment 4 a full new edition?

No. It is an amendment to the 18th Edition, not the 19th Edition.

Do I need new training for Amendment 4?

If you already hold the 18th Edition qualification, a CPD refresher is recommended.