Expert tips, study strategies, and insights to help you prepare for the IET Wiring Regulations exam.
Getting unequal R1+R2 readings when testing a ring final circuit? Learn the 3-step test procedure, the expected values, and the 5 most common reasons your readings don't match — with diagrams.
Read more →A practical guide to wiring a PIR motion sensor to an outdoor light fitting. Covers terminal connections, IP ratings, override switches, sensor adjustments, and the BS 7671 regulations you need to know.
Read more →A complete guide to the safe isolation procedure for electrical circuits. Covers the prove-dead process, GS38 test equipment requirements, locking off, warning labels, and the BS 7671 regulations you need to know for the exam.
Read more →A comprehensive guide to electrical earthing and bonding. Covers the three earthing systems (TN-C-S, TN-S, TT), main protective bonding, circuit protective conductors, conductor sizes, and the BS 7671 regulations for the IET exam.
Read more →A step-by-step guide to cable sizing per BS 7671. Covers design current, protective device selection, correction factors, voltage drop, and the key formula Ib ≤ In ≤ It with a worked example for the IET exam.
Read more →Understand what earth fault loop impedance (Zs) is, why it matters, how to measure it, and how to verify your results against BS 7671 maximum values. Includes the Zs = Ze + (R1+R2) formula and disconnection time tables.
Read more →A complete guide to insulation resistance (IR) testing per BS 7671. Covers test voltages, minimum values, the neutral conductor problem, false positives and negatives, and practical troubleshooting for the IET exam.
Read more →A clear explanation of the adiabatic equation S = √(I²t) ÷ k from BS 7671. Learn what it does, when to use it, and how to work through the calculation with a step-by-step example for the IET exam.
Read more →A complete guide to Residual Current Devices (RCDs) for the IET exam. Covers how RCDs detect faults, the different types (RCCB, RCBO), where BS 7671 requires 30mA protection, testing procedures, and common exam questions.
Read more →Understand why shared neutral conductors are dangerous and prohibited by BS 7671. Covers the risks of overloading, broken neutrals, RCD incompatibility, and safe isolation failures — with diagrams for the IET exam.
Read more →A practical guide to CPC continuity testing per BS 7671. Covers the R1+R2 method, the wander lead method, expected values, what the results tell you, and why this is the first test in the sequence.
Read more →A practical guide to supplementary equipotential bonding under BS 7671. Covers what touch voltage is, when supplementary bonding is required, conductor sizes, bathroom bonding rules, and how to test your connections.
Read more →Step-by-step cable sizing calculation for a domestic 7.4 kW EV charger per BS 7671 Section 722. Covers design current, correction factors, cable selection, voltage drop, Zs verification, and special requirements for electric vehicle charging installations.
Read more →A study guide for Part 6 of BS 7671 covering initial verification, periodic inspection, and testing procedures for electrical installations.
Read more →Proven strategies and tips for taking the IET Wiring Regulations mock tests. Learn how to manage time, avoid common mistakes, and maximise your score.
Read more →Everything you need to know about Part 7 of BS 7671 covering special installations including bathrooms, swimming pools, construction sites, and more.
Read more →A deep dive into Part 4 of the IET Wiring Regulations covering protection against electric shock, thermal effects, overcurrent, and more.
Read more →A comprehensive guide to preparing for the IET Wiring Regulations exam. Learn about the exam structure, key topics, and effective study strategies.
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