City & Guilds 2391-52 Electrical Inspection Exam Prep
Pass your 2391 qualification with confidence. Practice 445 open and closed-book questions, calculate max Zs and adiabatic limits, and master EICR fault coding.
Structured 2391-52 Study Modules
Covering both open-book technical regulations and closed-book quick recall skills.
Open Book Modules (BS 7671 & GN3 Allowed)
Initial Verification
Master the principles and procedures of initial verification for new electrical installations under BS 7671 Part 6.
Periodic Inspection
In-depth guidance on periodic testing, sampling strategies, EICR inspection schedules, and defect classification.
Statutory Requirements
Statutory legislation relevant to electrical inspection, including EAWR 1989, HASWA 1974, CDM 2015, and BS 7671:2018+A4:2026.
Test Procedures
Practical test methods, instrument accuracy standards (BS EN 61557), loop impedance, and RCD testing rules.
Certification & Reporting
Completing Electrical Installation Certificates (EIC), MEIWC, and Electrical Installation Condition Reports (EICR).
Fault Coding (Open)
BS 7671 and Guidance Note 3 classification codes for electrical defects found during condition reporting.
Safe Isolation (Open)
HSE Guidance Note GS38 and safe working procedures during electrical inspection and testing.
Closed Book Recall Modules
Closed: Initial Verification
Closed-book memory test on key safety rules, test sequence order, and fundamental inspection principles.
Closed: Periodic Inspection
Closed-book questions testing immediate recognition of inspection hazards, frequency, and report outcomes.
Closed: Safe Isolation
Essential closed-book memory recall of safe isolation steps, GS38 probe tip dimensions, and safety laws.
Closed: Fault Coding
Rapid recall test for assigning C1, C2, C3, and FI codes under pressure during exam conditions.
Interactive BS 7671 Calculators
Max Zs Calculator (BS 7671)
Calculate maximum earth fault loop impedance (Zs) for Type B, C, D MCBs and fuses with 80% temperature correction rule.
BS 7671:2018+A4:2026 Tables 41.2, 41.3, 41.4 & Appendix 14Adiabatic Equation Calculator
Calculate minimum protective conductor size (S) or maximum fault duration (t) using S = √(I²t) / k.
BS 7671 Regulation 543.1.3 & Formula 543.1.3Voltage Drop Calculator
Calculate cable voltage drop (mV/A/m) with conductor temperature correction factors for single and three-phase circuits.
BS 7671 Appendix 4 Section 6 & Table 4D1B-4L4BRing Final Circuit Continuity
Verify ring final circuit test results (r1, rn, r2), expected figure-of-8 reading (R1 + R2), and detect spurs or cross-connections.
BS 7671 Part 6 / Guidance Note 3 Section 2.7.5Field Inspection & Certificate Tools
Complete schedules of inspection, log dead & live test results, and generate EIC / EICR certificates on iOS and Android.
Schedule of Inspection Checklist
BS 7671 Itemized VerificationComprehensive itemized checklist covering connection of conductors, identification, routing, external influences, and protective devices.
- ✓ Itemized BS 7671 inspection checklist
- ✓ Pass / Fail / N/A state tracking
- ✓ Observation notes and photo attachment
- ✓ Automatic sync to EIC / EICR reports
Schedule of Dead Tests
Pre-Energisation LogStep-by-step test logging for protective conductor continuity, ring final circuit continuity, and insulation resistance prior to energisation.
- ✓ r1, rn, r2 ring circuit calculator & cross-check
- ✓ Insulation resistance log across L-L, L-N, L-E, N-E
- ✓ Temperature correction factor helper
- ✓ Automatic warning on out-of-spec readings
Schedule of Live Tests
Energised Circuit TestingReal-time calculation and validation for Ze, Zs, PFC/Ipf, and RCD trip times (1/2x, 1x, 5x) against BS 7671 maximum disconnect limits.
- ✓ Ze and Zs validation against BS 7671 tables
- ✓ Automatic 80% temp correction comparison
- ✓ RCD trip time compliance check (30mA / 100mA / 300mA)
- ✓ Phase rotation & functional test recorder
Latest 2391 Study Articles
BS 7671:2018+A4:2026 Inspection & Testing Updates Explained
Key changes in Amendment 4 (2026) affecting electrical inspection, EIC certificates, EV charging points, and protective conductor testing.
Mastering EICR Classification Codes: C1, C2, C3 and FI Explained
Learn how to correctly classify electrical inspection defects under BS 7671 and IET Guidance Note 3 with real-world inspection examples.
How to Pass the City & Guilds 2391-52 Exam: The Ultimate 2026 Guide
Master the C&G 2391-52 combined initial verification and periodic inspection exam with our proven study strategy, BS 7671 reference tips, and practical test sequence guide.
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