What is 18th Edition?

If you work in the electrical industry, you’ll know the wiring regulations change all the time, and keeping up with those changes is part of doing the job properly.

The 18th Edition is the name given to BS 7671:2018, which sets the standard for how electrical installations are designed, installed and maintained across the UK. It’s published by the Institution of Engineering and Technology (IET) and the British Standards Institution (BSI). 

It’s what electricians, inspectors and contractors refer to day-to-day, whether they’re planning work or checking that something already in place meets the right requirements.

It’s also part of the City & Guilds 2382 qualification, and passing the assessment isn’t just about knowing what’s in the book. Because it’s an open-book exam, the real test is how quickly you can find the right section and apply it to the situation in front of you.

Like most industry standards, it isn’t replaced every few years. Instead, it’s updated through Amendments. The latest of these, Amendment 4, was published in April 2026 and became the standard from 15 April 2026.

18th Edition Amendment 1

Amendment 1 was fairly focused, but it still gave a clear indication of where things were heading. One of the main areas it covered was electric vehicle charging, which was starting to appear more frequently across both domestic and commercial installations. 

It didn’t overhaul the regulations, but it did show how quickly new technology can influence the standards. For many in the industry, it was a reminder that even smaller updates can affect how work needs to be carried out on site.

18th Edition Amendment 2

Amendment 2 was a more noticeable step forward, particularly when it came to safety. The changes introduced here were more about prevention, aiming to deal with risks before they turn into bigger problems.

For many electricians, this changed how certain jobs were approached, especially in environments where safety is critical.

18th Edition Amendment 3

Amendment 3 didn’t introduce major changes, but it still played an important role. The focus was on corrections and clarifications, tightening up areas that could have been interpreted in different ways. When guidance is clearer, it reduces uncertainty and makes it easier to make the right call on site, particularly when you’re working under time pressure.

18th Edition Amendment 4

Amendment 4 was published in April 2026 and is the most recent update that underpins the exam. There’s a six-month transition period in place until 15 October 2026, after which Amendment 4 becomes the required standard for compliance. It reflects how much electrical installations have evolved, especially with the growth of newer systems and technologies. 

Some of the main areas it covers include: 

• Battery storage systems 

• Power over Ethernet (PoE) 

• Functional earthing for ICT systems 

• Updates to medical locations, including inspection and testing 

This is the version of the regulations professionals need to be comfortable working with in real-world situations.

Can you do 18th Edition online?

If you’re new to BS 7671, a full course usually makes sense, as it gives you the time to work through everything properly. If you’re already using the regulations in your day-to-day work and feel confident with them, an exam-only route can be a quicker way to confirm your knowledge. 

Either way, it’s not about memorising content. Because the assessment is open-book, what matters is how well you can navigate the regulations and apply them, especially with the changes introduced in Amendment 4.

Are you thinking about taking the City & Guilds 18th Edition?

If you’d like to find out more about the City & Guilds 18th Edition exam only, or the full 3-day course, please get in touch on 01926 674340.

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