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IET Wiring Regulations 18th Edition (Orange) Amendment 4:2026 to BS7671:2018
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- Current UK standard
- Modern installation practices
- Emerging technologies
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PWR1840B
MPN
PWR1840B
The IET Wiring Regulations 18th Edition Amendment 4:2026 is the current UK standard for electrical installations across domestic, commercial, and industrial environments. It defines the requirements for the design, installation, certification, and maintenance of low-voltage systems.
Published by the Institution of Engineering and Technology and the British Standards Institution, the regulations are maintained by the UK Wiring Regulations committee (JPEL/64), ensuring alignment with both UK-specific requirements and international standards.
From 15 April 2026, this amendment becomes the required reference for compliant electrical work, making it essential for electricians, engineers, and inspectors who need to work to the latest standard.
IET Wiring Regulations BS7671 Amendment 4: What has changed?
Amendment 4 Updates
This edition is a consolidated update to the BS 7671 wiring regulations, incorporating all previous amendments into a single reference.
Amendment 4 introduces the following updates:
New Requirements for Stationary Secondary Batteries
A new chapter dedicated to the safe installation and operation of BESS (Battery Energy Storage Systems) covering:
- Standardised installation: details a clear framework for backup power and advanced energy management systems
- Safety and Compliance: outlines new requirements for BESS siting, protection, and integration
IET Wiring Regulations BS7671 Amendment 4: Stationary Secondary Batteries Explained
Functional Earthing and Bonding for ICT Equipment
This new section covers functional earthing and equipotential bonding for communication and data systems:
- Maintaining Integrity: provides information on ensuring stable earthing to prevent interference in data centres and smart building networks
- Reducing Risk: new rules on mitigating electromagnetic disturbances and potential differences that could damage sensitive equipment
IET Wiring Regulations BS7671 Amendment 4: Functional Earthing & Bonding for ICT
Dedicated Section for Power over Ethernet (PoE)
New guidance in Amendment 4 helps electricians design and install PoE systems safely and efficiently:
- Power and data integration: PoE delivers data and electricity via one cable to power cameras and smart sensors
- Thermal Management: provides information on appropriate cable ratings and managing heat build-up
IET Wiring Regulations BS7671 Amendment 4: Power over Ethernet (PoE) Guidance
Major Revision to Section 710: Medical Locations
A full update to Section 710 includes new testing schedules for supplementary protective bonding resistance, alongside:
- Critical Resilience: clearer requirements for earthing, bonding, and supply continuity to protect patients on life-support equipment
- Safety Standard Alignment: details the latest safety standards for modern healthcare technology
IET Wiring Regulations BS7671 Amendment 4: Medical Locations Update (Section 710)
18th Edition Amendment 4 Training Courses
Electricians, electrical contractors, and designers must work in accordance with the most current IET wiring regulations, i.e.,18th Edition Amendment 4. Moreover, you must hold a valid 18th Edition qualification to register with recognised Competent Person Schemes (CPS) and apply for an ECS card.
To help you get up to speed with the latest amendments, we offer a City & Guilds 18th Edition Wiring Regulations Course (in-person and online). The course provides essential knowledge of the BS 7671 wiring regulations, ensuring you can design, install, and verify electrical systems in line with the latest electrical standards.
Upon completing the course, you will be awarded a Level 3 certificate, enhancing your professional credibility and supporting career progression.
IET Wiring Regulations BS7671 Amendment 4: Transitioning from old to new regulations.
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SKU
PWR1840B
Manufacturer Part Code
PWR1840B
IET Wiring Regulations 18th Edition (Orange) Amendment 4:2026 to BS7671:2018
£125.00
£125.00 inc vat
£125.00
£125.00 inc vat