18th Edition Video Questions Answered 

When the 18th Edition of the Wiring Regulations came into force in January 2019, it changed how electricians across the UK a pproached inspection, testing, and compliance. At Elec Training, we regularly get asked about the practical details, especially from learners preparing for their exams and working sparks who want to stay on top of the latest updates. 

Below we’ve brought together some of the most common questions raised by electricians, apprentices, and career changers — with clear, straightforward answers. 

1 – When Did the 18th Edition Come into Effect?

The 18th Edition regulations officially came into force in January 2019. From that date, all electricians were expected to hold the updated qualification to demonstrate compliance with BS 7671. 

2  – What Do the Regulations Mean for RCD Breakers?

An RCD (Residual Current Device) protects against earth fault leakage but does not provide overload protection. An RCBO combines both functions: circuit b reaker protection plus the residual current monitoring of an RCD. 

In practice, RCBOs are often preferred as they provide both layers of safety in one device. 

3 – What’s the Difference Between Inspection and Testing?

• Inspection – A visual check of the installation. 

• Testing – The use of measuring equipment to verify safety before energising the system. 

Both steps are essential, and electricians must carry them out systematically to comply with BS 7671. 

4 – What Changed Around PFC and Certification?

Chapters 61–63 were replaced with chapters 64 and 65. While the approach remains similar, a few key updates include: 

• Ring final circuits – Continuity now falls under Regulation 643.2. 

• Supply polarity – Regulation 643.6 requires verification before energising. 

• PFC (Prospective Fault Current) – Regulation 643.7.3.201 still requires measurement at relevant points. 

• Certificates – The new forms include added columns for Zs values, insulation resistance test voltages, and AFDD function tests. 

Minor Works Certificates now also require more detail than before. 

5 – Why Are the Regulations Updated So Often?

The UK is legally aligned with European standards through CENELEC. Alongside this, the IET (Institution of Engineering and Technology) writes the regulations and the BSI (British Standards Institution) publishes them. 

Updates occur regularly to reflect innovation, safety improvements, and new technology entering the industry. 

6 – When Can We Expect the 19th Edition?

Typically, a new edition is released every 10 years, with amendments in between. Following that cycle, the 19th Edition could appear around the late 2020s, though amendments are more likely first. 

For sparks thinking about their future career, this is why staying trained and adaptable matters. For more context, see Are electrician jobs safe from robots?. 

7 – Will Cable Standards Change?

Some asked whether the UK might adopt flat twin-and-earth cables with continuous insulation on the CPC. At present, there are no plans to change the long-standing UK design. 

8 – Can YY Type Cables Be Used?

YY cables have no BS or BS EN specification. That means their use is discouraged in fixed installations. If used, it would be considered a departure from BS 7671 and must be formally recorded. 

9 – Are AFDDs Recommended?

Arc Fault Detection Devices (AFDDs) are recommended under Section 421.47 for additional fire protection. While not mandatory for all domestic i nstallations, they are particularly advised for: 

• Sleeping accommodation. 

• Fire-propagating structures. 

• Properties containing irreplaceable goods (e.g., museums). 

AFDDs detect dangerous arcing conditions and isolate circuits before fire can start.

10 – What About SPDs?

Surge Protective Devices (SPDs) are required unless a risk assessment justifies their absence. They protect electrical systems and equipment from transient overvoltages, reducing fire risk and damage to sensitive electronics. 

11 – What Are Fire-Resistant Fixings?

Fire-resistant fixings are typically steel or copper supports that hold cables in place even during a fire. This prevents premature collapse of wiring systems, which previously caused fatal risks for firefighters when plastic fixings melted. 

Today, fire-resistant fixings are a mandatory requirement in new installations. 

Why Updates Matter for Electricians 

While some sparks grumble about constant changes, the reality is that BS 7671 evolves to save lives and reflect how electrical work adapts to new challenges. Whether it’s the introduction of SPDs, AFDDs, or new certification detail, every update builds a safer environment for both tradespeople and the public. 

If you’re preparing for your qualification, see Can you become an electrician if you’re colour blind? for guidance on entry requirements, or explore location-based training at Electrician courses in Stafford and Electrician courses in Worcester. 

For exam preparation tips, Top tips for taking your electrical exams is another essential read. 

The 18th Edition isn’t just a set of rules to learn for an exam; it’s a framework that keeps homes, workplaces, and electricians safe. Understanding the intent behind each regulation helps sparks apply them in practice, not just in theory. 

For learners, employers, and experienced electricians alike, keeping up to date ensures not only compliance but also professional credibility. And when the 19th Edition does eventually arrive, those already familiar with the process of continual learning will adapt fastest. 

FAQ: 18th Edition Wiring Regulations (BS 7671:2018) 

1 – When did the 18th Edition Wiring Regulations come into effect? The 18th Edition (BS 7671:2018) was published on July 1, 2018, and came into effect on January 1, 2019, with a 6-month transition period from the 17th Edition. 

2 – Do I need the 18th Edition qualification to work as an electrician? Yes, the 18th Edition (C&G 2382-18) is mandatory for compliance with BS 7671; without it, you can’t legally certify installations or join schemes like NICEIC. 

3 – What are the main differences between the 17th and 18th Editions? The 18th Edition introduces mandatory RCD protection for all sockets, AFDDs for high-risk areas, surge protection, and EV charging requirements, unlike the 17th’s optional measures. 

4 – How do RCDs and RCBOs differ under the 18th Edition? RCDs protect multiple circuits from residual current; RCBOs combine RCD and MCB for single-circuit protection, both now mandatory for sockets up to 32A. 

5 – What inspection and testing changes should electricians know about? Changes include AFDD testing requirements, enhanced RCD verification, and surge protection checks; EICRs now emphasize fire safety and energy efficiency. 

6 – Are AFDDs now mandatory in domestic installations? No, AFDDs are recommended but mandatory only in high-risk domestic areas like bedrooms; required in HMOs and care homes. 

7 – When are Surge Protective Devices (SPDs) required? SPDs are required in installations with lightning risk or critical equipment, unless risk assessment shows otherwise; mandatory in new builds. 

8 – What are fire-resistant cable fixings, and why are they important? Fire-resistant fixings (metal clips) secure cables to prevent collapse in fires; important for escape routes, maintaining integrity for 30-120 minutes. 

9 – How often are wiring regulations updated, and when is the 19th Edition expected? Wiring regulations are updated every 5-10 years with amendments; 19th Edition is expected in 2027, following Amendment 3 in 2024. 

10 – Can I still use older cables or components if they don’t fully meet BS 7671? Older compliant cables can remain if safe, but new work must meet BS 7671; upgrades recommended for safety during alterations.