How long is Section D of the AM2?

Section D is 2 hours covering fault diagnosis and rectification on a pre-built rig. The number of faults varies but is typically 2-3 distinct faults of different types. The 2-hour budget includes diagnosis, safe isolation, rectification, and verification re-testing for each fault.

What faults does NET typically set in the AM2?

NET draws faults from a defined pool: open circuits (broken conductor or loose connection), short circuits (touching or damaged conductors), polarity swaps (L and N transposed), missing CPC (protective conductor not terminated), and high-resistance connections (loose or oxidised joints). Each fault type produces a distinctive symptom on the test instruments — the diagnostic skill is recognising the symptom and tracing back to the cause.

How do I identify an open circuit fault?

Symptom: the circuit is completely dead with no power reaching the load. Diagnosis: continuity test on the affected conductor reads infinity. Common locations: terminations at accessories (loose or unmade), conductor breaks inside the cable, blown internal fuses on protective devices. Trace systematically from the load back towards the supply.

How do I identify a high-resistance connection?

Symptom: appliance works but underperforms (motor runs slow, light dim), or testing shows higher than expected resistance on the continuity test. Diagnosis: compare your continuity reading against the calculated value for the cable length + size. A reading materially higher than expected suggests a loose, oxidised, or under-stripped connection somewhere in the circuit.

Why does method matter more than result in Section D?

Because the AM2 assesses your competence as a future qualified electrician — and on real jobs you will face faults you have never seen before. A logical, repeatable diagnostic method works on any fault. Guessing only works on faults you have memorised. The assessor wants to see you can apply the method to unfamiliar problems, which is why they grade the process not just the outcome.

AM2 SECTION D

AM2 Section D: AM2 Section D — Fault Diagnosis + Rectification — 2 hours — systematic method

Section D is fault diagnosis and rectification. 2 hours to find and fix the faults NET has built into the rig. The assessor watches your METHOD as much as your result — a candidate who logically isolates the fault scores higher than one who guesses correctly. Random poking is a fail signal.

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10 min readUpdated 2026-05-19Andrew Moore, Founder of Elec-Mate

Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.

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Key Takeaways

1Section D is 2 hours covering systematic fault diagnosis + rectification.
2NET typically builds in: open circuits, short circuits, polarity swaps, missing CPCs (protective conductors), high-resistance connections.
3Assessors mark your METHOD, not just whether you find the fault. Logical sequence + reasoning is graded.
4Open circuit symptom: circuit completely dead, no power at all to the load.
5Short circuit symptom: very low or zero insulation resistance between the affected conductors.
6High-resistance connection symptom: continuity test shows higher than expected resistance.
7Rectification must be safe + verified — re-test after the fix to confirm the circuit is now compliant.

01 · AM2 Section D

What Section D covers

Section D is fault diagnosis and rectification on a pre-built rig with deliberate faults set by the assessor. You have 2 hours to find, rectify, and verify each fault. The faults vary by sitting but follow common patterns — open circuits, shorts, polarity swaps, missing CPCs, high-resistance connections. The assessor is grading your method: a logical, repeatable diagnostic sequence scores higher than guessing, even if you arrive at the same answer.

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02 · AM2 Section D

Typical AM2 faults NET builds in

Open circuit — broken conductor, loose connection, blown internal fuse. Symptom: dead circuit, no power.
Short circuit — conductors touching, damaged insulation, wrong wiring. Symptom: very low IR (close to zero).
Polarity swap — L and N transposed somewhere in the circuit. Symptom: appliances may work, but live/neutral reversed at the accessory.
Missing CPC — protective conductor not terminated or broken. Symptom: high or infinite continuity reading on R1+R2 test.
High-resistance connection — loose terminal, oxidised joint, badly stripped conductor. Symptom: continuity test reads higher than expected.

03 · AM2 Section D

The logical fault-finding method assessors expect

Read the symptom — confirm what the user reports + what the test indicates.
Form a hypothesis — what type of fault could produce this symptom?
Narrow the location — half-split the circuit, test at the midpoint, identify which half contains the fault.
Test the hypothesis — apply the specific test that confirms or rules out your fault type.
Identify the precise fault location — accessory, terminal, conductor.
Plan the rectification — safe isolation, parts needed, time required.
Rectify safely — make the repair with the circuit isolated and locked off.
Verify — re-test the affected circuit after the fix. The fault must be cleared AND the original test values must now be within BS 7671 limits.

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04 · AM2 Section D

Common Section D mistakes

Random poking — checking accessories without a hypothesis. The assessor sees this as guessing.
Forgetting to safely isolate before rectification.
Not re-testing after the fix — assessor needs to see the verification.
Misreading the symptom — assuming open circuit when it is actually high resistance.
Using the wrong test instrument range or function for the fault type.
Not documenting the fault + rectification on the test sheet.

05 · AM2 Section D

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AM2 Section D — FAQ

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AM2 Section D: AM2 Section D — Fault Diagnosis + Rectification — 2 hours — systematic method

Key Takeaways

What Section D covers

Get the BS 7671 A4:2026 Cheat Sheet — free

Typical AM2 faults NET builds in

The logical fault-finding method assessors expect

Try Elec-Mate free for 7 days

Common Section D mistakes

Study with Elec-Mate

AM2 Section D — FAQ

How long is Section D of the AM2?

What faults does NET typically set in the AM2?

How do I identify an open circuit fault?

How do I identify a high-resistance connection?

Why does method matter more than result in Section D?

Continue reading

AM2 Assessment Structure

AM2 Section A — Composite Installation (8.5h)

AM2 Section B — Inspection + Testing (3.5h)

AM2 Section C — Safe Isolation (45 min)

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