IET Wiring Regulations 18th Ed

IET Wiring Regulations is the ultimate professional companion for UK electricians. Go beyond exam prep with on-site calculators, quick reference tables, inspection checklists, and digital certificates you’ll use every working day. NEW (May 2026): Updated to BS 7671:2018+A4:2026 with an in-app syllabus picker — switch between 2022 (A2 / 2382-22) and 2026 (A4 / 2382-26) question banks from Settings. --- EXAM PREP --- Over 670 practice questions across 9 topics covering BS 7671:2018+A2:2022 AND BS 7671:2018+A4:2026. Choose your syllabus version from Settings — both question banks are included. Comprehensive explanations with section and page references for every answer. Mock tests with weighted scoring track your readiness for C&G 2382-22 and 2382-26. --- 21 BS 7671 CALCULATORS --- • Cable Sizing - current carrying capacity per BS 7671 • Voltage Drop - mV/A/m calculations (Table 4D5B) • R1+R2 - conductor resistance from Table I1 • Conduit & Trunking Fill - cable fill calculations • Cable Resistance at Temp - temperature correction • Earth Fault Loop (Zs) - impedance check against Table 41 • Prospective Fault Current (PFC) • Adiabatic Equation - minimum CPC size (Table 54.4) • MCB / RCBO Selector - device selection per Reg 411 • Discrimination - upstream/downstream coordination • Connected Load Total - maximum demand (Appendix A) • Diversity - demand reduction factors • Three-Phase Balancing - load distribution • Power Factor Correction • Ohm’s Law / Power - foundational calculations • Ring Final Circuit - R1, R2, Rn checks • EV Charger Installation - Section 722 compliance • Motor Circuit - design per Reg 552 • Solar PV / DC Sizing - Section 712 • Earthing & Bonding - conductor sizing (Table 54.8) • Lighting / Downlights - lumen and spacing calculations --- 12 QUICK REFERENCE CATEGORIES --- • Key Formulas - essential BS 7671 equations • Zs Values - earth fault loop impedance tables • Cable Capacities - current ratings by installation method • Correction Factors - Ca, Cg, Ci grouping and thermal factors • Voltage Drop - mV/A/m tables and permissible limits • Conductor Resistance - R1+R2 reference values • Earthing & Bonding - systems, conductors, and sizing • Special Locations - bathroom zones, swimming pools, saunas • IP Ratings - ingress protection code reference • RCD Requirements - types, ratings, and where required • Disconnection Times - maximum times by circuit type • Insulation Resistance - minimum IR values by voltage --- 8 PROFESSIONAL UTILITIES --- • Amendment Tracker - follow all changes from the 18th Edition through Amendments 1-4 • CPD Logger - log continuing professional development hours with annual target tracking • Dead Testing - digital schedule of test results for dead testing • Live Testing - digital schedule of test results for live testing • Visual Inspection - digital schedule of inspection checklist • Digital Certificates - create and export EICR and EIC certificates as PDF • EICR Coding Guide - quick reference for C1, C2, C3 and FI observation codes • Part P Guide - interactive decision tree for Building Regulations Part P compliance --- EXAM TOPICS --- • Part 1 - Scope, Object and Fundamental Principles • Part 2 - Definitions • Part 3 - Assessment of General Characteristics • Part 4 - Protection for Safety • Part 5 - Selection and Erection of Equipment • Part 6 - Inspection and Testing • Part 7 - Special Installations or Locations • Part 8 - Prosumers Installation • Use of Appendices --- BUILT FOR THE JOB SITE --- Flash cards for quick revision. Mock tests with weighted scoring. Progress tracking with pie charts. Works offline. All data saved locally on your device. Whether you’re preparing for your C&G 2382-22 or 2382-26 exam, carrying out an EICR, or sizing cables on site – IET Wiring Regulations is the one app every electrician needs.