Blog
Longer pieces on the parts of the 2391-52 that cost candidates marks — written against BS 7671 and named guidance, with the reasoning shown.
How the 18th Edition reorganised Part 6 into Chapters 64 and 65, and what changed for continuity, insulation resistance and ADS checks.
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How to complete an EICR accurately: extent, limitations, observations, test results and the Amendment 4 changes that affect your report.
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Testing a two-way lighting circuit: R1+R2, proving polarity through both strappers, and why insulation resistance is done twice.
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What an EICR covers: the Chapter 65 requirements, the dead-then-live test sequence, inspection intervals and how findings are recorded and coded.
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How the earth fault loop actually works on TN-S and TN-C-S, what Ze, R1 and R2 each contribute, and why the loop has to be low impedance.
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An EICR on a rented property, step by step: inspection before testing, dead tests before live, and why Ze needs the installation isolated first.
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How to measure Ze with the earthing conductor disconnected, then take PEFC and PSCC with it reconnected — and which figure becomes your Ipf.
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How to classify EICR observations as C1, C2, C3 or FI, record defensible reasons and handle limitations under BS 7671 Part 6.
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Where Ze, Zs, PFC and PSCC are measured, the maximum values for TN-S, TN-C-S and TT, and the safe isolation the live tests demand.
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The test that decides between an Electrical Installation Certificate, a Minor Works Certificate and a Condition Report — and the schedules each needs.
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How to choose between the four EICR classification codes, why C3 never makes a report unsatisfactory, and the one question that settles most coding decisions.
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A revision plan for the City & Guilds 2391-52 — how to split open and closed book practice, what the exam weighting tells you, and where marks are lost.
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The prove–test–prove sequence, GS38 requirements for probes and leads, why a multimeter is the wrong instrument, and how CAT ratings work.
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The dead and live test sequence from Regulation 643.1 in order, with the reason each test comes where it does — and the reordering mistakes that cost marks.
Read the article →Free practice questions in every syllabus area, and the full bank with weighted mock exams in the app.
