Understanding the Requirements of the 18th Edition of the IET Wiring Regulations (BS 7671:2018+A3:2024) for Electric Vehicle Charging
Note (current as of 2026): the in-force amendment is Amendment 3:2024 (BS 7671:2018+A3:2024, published 31 July 2024). Amendment 4 (BS 7671:2018+A4:2026, the “Orange Book”) was published in April 2026 and becomes mandatory from 15 October 2026; until then installers may work to either amendment.
Introduction The 18th Edition Wiring Regulations are essential for ensuring the safety and efficiency of electrical systems. With the growing popularity of electric vehicles, it’s important to understand the requirements of the 18th Edition Wiring Regulations for electric vehicle charging. In this blog post, we’ll explain the requirements of the 18th Edition Wiring Regulations for electric vehicle charging and provide you with information to help you choose the right electric vehicle charging system.
Overview of Electric Vehicle Charging
Electric vehicle charging involves the transfer of electrical power from a power source to an electric vehicle. There are three types of electric vehicle charging: slow, fast, and rapid. Slow charging takes several hours to fully charge a vehicle, while fast and rapid charging can take less than an hour. Electric vehicle charging should be safe and efficient to prevent any damage to electrical systems and ensure the safety of the user.
Requirements for Electric Vehicle Charging in the 18th Edition (Section 722)
Electric vehicle charging installations are covered by Section 722 of BS 7671. Key requirements include:
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Download information pack- Each charging point fitted with a socket-outlet or connector (BS EN 62196 series) must be protected by a 30 mA RCD.
- Protection must be provided against DC residual fault current. The protective device must detect a smooth DC residual current of 6 mA or more — provided either by an RDC-DD built into the charging equipment, or by a Type A/Type F RCD combined with a residual direct-current detecting device (RDC-DD to BS IEC 62955), or by a Type B RCD.
- On PME (TN-C-S) supplies, additional measures are required to manage the open-PEN conductor fault risk — for example an open-PEN protective device that disconnects on a dangerous voltage, or a dedicated TT earthing arrangement (earth electrode) for the EV installation.
- The installation must be carried out by a competent, qualified electrician and certified, inspected and tested in accordance with BS 7671.
- Amendment 4:2026 clarifies that Arc Fault Detection Devices (AFDDs) are not required on circuits supplying EV charging equipment that uses socket-outlets or vehicle connectors to the BS EN 62196 series.
Choosing the Right Electric Vehicle Charging System
When choosing an electric vehicle charging system, it’s important to consider factors such as charging speed, cost, and compatibility. Electric vehicle charging systems should be reliable, efficient, and safe. It’s recommended to work with a qualified electrical contractor to ensure that the system is installed and maintained correctly.
Installation and Maintenance of Electric Vehicle Charging Systems The installation and maintenance of electric vehicle charging systems should be carried out by a qualified electrical contractor. Regular maintenance and inspection are important for ensuring safe and efficient operation. It’s important to follow the guidelines set out in the 18th Edition Wiring Regulations for the installation and maintenance of electric vehicle charging systems.
Summary
The 18th Edition of the IET Wiring Regulations (BS 7671:2018+A3:2024), and its Section 722 requirements, are important for ensuring the safety and efficiency of electric vehicle charging systems. The same edition also introduced new surge protection requirements under the 18th Edition that installers should be aware of. The same edition also introduced new surge protection requirements under the 18th Edition that installers should be aware of. By understanding the requirements of the 18th Edition Wiring Regulations, you can choose the right electric vehicle charging system and ensure safe and efficient operation. Remember, it’s important to work with a qualified electrical contractor for the installation and maintenance of electric vehicle charging systems. By following these guidelines, you can create a safe and reliable electric vehicle charging system for your needs.
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