City & Guilds 2391-52
Pass your inspection and testing exam
445 exam-standard questions across open and closed book practice, plus the calculators, reference and coding tools you actually use on site. Written against BS 7671:2018+A4:2026 Part 6 (Inspection and Testing).
Sat in two parts, revised in two parts
The 2391-52 puts you through an open book paper and a closed book paper. The question bank is split the same way, so you practise finding a regulation and recalling one as two separate skills.
Open Book
320 questions
Questions you answer with BS 7671 in front of you — the ones that test whether you can find and apply a regulation, table or appendix quickly.
Practise open book questionsClosed Book
125 questions
Questions you answer from knowledge alone — classification codes, test sequences, safe isolation and the values you are expected to carry in your head.
Practise closed book questionsThe seven syllabus areas
Each area has a study guide, free practice questions, and the weighting it carries in the 60-question mock exam.
Initial Verification
Verifying a new installation before it is energised: the information you need before starting, the inspection schedule, and the dead and live tests required by BS 7671 Part 6.
97 questions 14 in the mock exam
Periodic Inspection
Assessing an existing installation: agreeing the extent and limitations, sampling, the checks that can safely be carried out on an occupied installation, and reaching an overall assessment.
103 questions 14 in the mock exam
Test Procedures
The tests themselves: continuity of protective conductors, ring final circuit continuity, insulation resistance, polarity, earth fault loop impedance, prospective fault current and RCD operation.
48 questions 12 in the mock exam
Certification and Reporting
Choosing and completing the right document — EIC, Minor Works Certificate or EICR — together with the Schedule of Inspections and Schedule of Test Results that must accompany it.
63 questions 8 in the mock exam
Fault Coding
Classifying observations on an EICR as C1, C2, C3 or FI — the single skill the 2391-52 tests hardest, and the one that decides whether a report is satisfactory or unsatisfactory.
67 questions 6 in the mock exam
Safe Isolation and GS38
Proving a circuit dead before working on it: the prove–test–prove sequence, HSE Guidance Note GS38 test-probe and lead requirements, and voltage indicator CAT ratings.
31 questions 3 in the mock exam
Statutory Requirements
The legal framework around inspection and testing: the Electricity at Work Regulations, the Health and Safety at Work etc. Act, Building Regulations Part P and where BS 7671 sits among them.
36 questions 3 in the mock exam
Mock exam
Weighted the way the real paper is
The app's mock test is 60 questions in 120 minutes, drawn across the syllabus in the same proportions as the live 2391-52 paper, against a 75% pass mark. Questions and answer options are shuffled every attempt, so you learn the subject rather than the position of the right answer.
Mock exam weighting
- Initial Verification 14
- Periodic Inspection 14
- Test Procedures 12
- Certification and Reporting 8
- Fault Coding 6
- Safe Isolation and GS38 3
- Statutory Requirements 3
Totals 60 questions. Source: the app's own exam weighting configuration.
Tools that outlast the exam
The parts you keep using once you are qualified — the calculators and reference work in your browser right now.
4 calculators
Max Zs, Ring Final, Adiabatic, Voltage Drop — the same formulas as the app, working in the browser.
14 reference cards
Test values, classification codes, GS38 requirements and the dead/live test sequences, with the regulation behind each one.
Fault coding trainer
12 real EICR observations to classify as C1, C2, C3 or FI — with the reasoning for each.
6 field tools in the app
Digital EIC, Minor Works and EICR certificates with PDF export, the full Schedule of Inspection, and the dead and live test schedules. These stay in the app — they write to your device and sync through your own iCloud account.
Start with the free questions
Every syllabus area has free practice questions on this site, with the same worked explanations as the app. When you want the full 445-question bank and the weighted mock exam, the app is on iPhone, iPad and Android.