IET and BSI publish the 18th Edition IET Wiring Regulations

The 18th Edition of the IET Wiring Regulations has been published. The essential publication for all professionals working in the electrical industry forms the national standard to which all new and amended electrical installations in the UK are to comply. The IET urges all electrical professionals to ensure they are familiar with the changes before the new requirements come into effect from January 2019.

Significant changes include recommendations for Arc Fault Detection Devices (AFDDs) in AC final circuits; requirements for devices for protection against overvoltage; a change to the requirement for the methods of supporting wiring systems within buildings against their premature collapse in the event of a re’ and a new Appendix focusing on energy efficiency.

Changes have also been made to the requirements for electric vehicle charging installations with PME supplies (the most common form of earthing in new installations) as well as new guidance for the design and erection of electrical installations that have local production and storage of energy for optimising efficiency.

The changes to BS 7671 come from to the revision of international and European standards, of which the UK is obliged to take on the technical intent. JPEL/64 members represent the UK on many of these international committees and the content to be included is discussed in terms of the impact on UK industry, before a new update to BS 7671 is agreed and published.

Mark Coles, Head of Technical Regulations at the IET, said, “The IET is the authority for electrical installation in the UK and ensures that JPEL/64, the national Wiring Regulations committee, carefully considers all necessary updates to the Regulations to ensure they best meet the needs of the industry.

“The 18th Edition of the IET Wiring Regulations contains some significant changes to the way all electrical professionals are required to carry out their work in order to safeguard themselves and the public. With this in mind, it is essential that all electrical professionals ensure that they are up to speed with the new requirements.”

BS 7671:2018 and the IET’s popular suite of guidance are available from To accompany the 18th Edition, the IET is launching online training for the City & Guilds 2382:18 qualification.

The only online training to be endorsed by City & Guilds for this qualification, the Full and Update courses both offer flexible learning, in your own time at your own pace. Accessible via an app, the training also includes three, full, practice exams to fully prepare you for the real thing.

More information can be found at

To find out more about the new requirements for electrical installations, you can also speak to an expert at the IET on 0044 (0)1438 765599 or email