EICR Coding for Electricians

C1, C2, C3 and FI: 138 Graded Scenarios and 150 Worked Observations for BS 7671:2018+A4:2026

The same defect can get a C2 from one inspector and a C3 from the next. This book is practice in getting the code right on an Electrical Installation Condition Report under BS 7671:2018+A4:2026.

What is inside

• 138 original coding scenarios, graded 46 Easy, 57 Core and 35 Challenging, from single findings to short jobs with several findings, limitations and FI
• 18 heating scenarios: night storage and panel heaters, boilers and their controls supplies, electric and flow boilers, heat pump isolators, electric floor heating, immersion heaters, towel rails, frost thermostats and trace heating
• Every answer gives the code, the reasoning, the overall outcome and the page to look up in the free guidance it rests on
• Judgement notes wherever a code turns on what the inspector finds, saying what would change it
• 150 worked observations grouped by area, for reference
• FI or C3: how to tell them apart, with three questions to ask before writing FI
• Extent and limitations: agreed, operational and standard limitations, and what goes in Section D
• What A4 changed for coding, checked against the IET's A4 and A2 model forms
• 33 model observations in plain wording, and 24 common coding mistakes, each linked to practice
• The law for rented homes in England, with the regulation for each point

Every coding point gives its source and page, and every source was checked by computer. Codes depend on the inspector's own assessment of what they find; the book shows the reasoning so you can make that call.

Independent publication. Not produced, endorsed or approved by City & Guilds, the IET or BSI. Nor by Electrical Safety First, whose free guides it cites. BS 7671 and guide text are not reproduced: you will need your own copy of BS 7671:2018+A4:2026 and the free guides.

Written by a City & Guilds 2391-51 qualified electrician.

Printable A4 PDF, 86 pages, with clickable contents. Every question links to its answer and back. Print the practice pages to write your answers.

Also available: the 2391-52 Inspection and Testing Practice Papers, Inspection and Testing Calculations, Electrical Science Calculations and the BS 7671 A4:2026 Practice Papers come together in the Electrician Study Bundle for £34.99. The bundle does not include this book, which is sold separately.