Implications of New Changes to UK Wiring Regulations: An Overview of the "Corrigendum to BS 7671:2018+A2:2022"

Introduction: Electrical safety is of paramount importance in any country, and the United Kingdom (UK) has long been at the forefront of establishing rigorous regulations to ensure the safety and reliability of electrical installations. These regulations are periodically updated to incorporate advancements in technology, industry best practices, and emerging safety concerns. One such crucial document is the "Corrigendum to BS 7671:2018+A2:2022," introducing changes to the UK wiring regulations. In this article, we will explore the critical modifications outlined in this document and discuss their implications for electrical installations in the UK.

  1. Background: BS 7671:2018+A2:2022 BS 7671, also known as the IET Wiring Regulations, sets the standard for electrical installations in the UK. It provides comprehensive guidance on the design, installation, inspection, and testing of electrical systems. The document ensures the safety of people, livestock, and property against electrical hazards and forms the foundation for compliance with legal obligations.
  2. Overview of the Corrigendum to BS 7671:2018+A2:2022 The Corrigendum to BS 7671:2018+A2:2022 introduces several changes and updates to enhance electrical safety in the UK. Notable amendments include:

a) Arc Fault Detection Devices (AFDDs): One significant change is the expanded requirement for Arc Fault Detection Devices (AFDDs). AFDDs are designed to detect and disconnect electrical circuits when dangerous arc faults occur, thus preventing potential fire hazards. The corrigendum extends the scope of AFDDs to cover additional areas, such as dwelling units with sleeping accommodations and rooms containing a bathtub or shower. This modification aims to provide increased protection against the risk of fires caused by electrical arcs.

b) Surge Protection Devices (SPDs): The updated regulations now emphasize the importance of Surge Protection Devices (SPDs) in safeguarding electrical installations against transient overvoltages caused by lightning strikes and other electrical disturbances. The corrigendum introduces new requirements for the installation of SPDs in various scenarios, including Type 1, Type 2, and Type 3 devices, to protect against different levels of voltage surges.

c) Electric Vehicle Charging Installations: With the rise in electric vehicles (EVs), the corrigendum addresses the need for specific requirements and safety measures for EV charging installations. It provides guidance on the selection, installation, and protection of EV charging equipment, including the incorporation of residual current devices (RCDs) and the prevention of fire risks associated with charging cables and infrastructure.

  1. Implications of the Changes: The amendments introduced by the corrigendum have significant implications for electrical contractors, installers, and inspectors in the UK. Some key implications are as follows:

a) Compliance and Training: Professionals involved in electrical installations need to familiarize themselves with the updated regulations and ensure compliance with the latest requirements. Adequate training and upskilling will be essential to adapt to the changes and maintain high standards of electrical safety.

b) Enhanced Fire Safety: The expanded use of AFDDs will improve fire safety in residential settings, as these devices provide additional protection against electrical arc faults. By promptly detecting and disconnecting faulty circuits, AFDDs can reduce the risk of electrical fires, potentially saving lives and property.

c) Surge Protection: The emphasis on SPDs reinforces the importance of protecting electrical installations from transient overvoltages. Installing the appropriate SPDs can safeguard sensitive electronic equipment, minimize the risk of electrical failure, and prevent damage caused by power surges, thereby reducing repair and replacement costs.

d) EV Charging Safety: The inclusion of specific requirements for EV charging installations ensures that the growing demand for electric vehicles is accompanied by safe and reliable charging infrastructure. This will help mitigate the risks associated with EV charging, such as electrical faults, overheating, and fire hazards.

Conclusion: The "Corrigendum to BS 7671:2018+A2:2022" brings important changes to the UK wiring regulations, enhancing electrical safety and addressing emerging concerns. The expanded use of AFDDs, the emphasis on surge protection, and the inclusion of guidelines for EV charging installations are key amendments that will contribute to safer electrical systems across the UK. Electrical professionals must stay informed about these changes, adapt their practices, and ensure compliance to uphold the highest standards of electrical safety.


  1. Institution of Engineering and Technology. (2022). Wiring Regulations BS 7671:2018+A2:2022 Corrigendum.
  2. Electrical Safety First. (2022). BS 7671:2018+A2:2022 IET Wiring Regulations Corrigendum: Overview of Changes.
  3. The IET (Institution of Engineering and Technology). (2022). Amendments to BS 7671:2018+A2:2022 IET Wiring Regulations.