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Inspection & Testing (2391) Prep

C&G 2391 initial verification & periodic inspection.

Written against the published specification.

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Pass mark 24/35 60 minutes C&G 2391 How many can I get wrong?
About this practice. Revision Robin is built and maintained by Bloor Engineering Ltd, a UK-registered company. Our Inspection & Testing (2391) Prep questions are written and reviewed in-house to match the current syllabus, each with a plain-English worked explanation. They are original practice material, not the official exam questions and not affiliated with or endorsed by C&G 2391. Always confirm current test rules, fees and content with the official provider. See our Terms and Privacy.
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Try 3 real Inspection & Testing (2391) Prep questions
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Q1. Which piece of legislation is the primary statutory instrument requiring electrical systems to be constructed and maintained so as to prevent danger, so far as is reasonably practicable?
  • A.  The Electricity at Work Regulations 1989
  • B.  BS 7671 (IET Wiring Regulations)
  • C.  The IET Guidance Note 3
  • D.  The On-Site Guide
Show answer & explanation
✓ Answer: A. The Electricity at Work Regulations 1989
The Electricity at Work Regulations 1989 (EAWR) are made under the Health and Safety at Work etc Act 1974 and are statutory law. BS 7671 and its associated IET guidance are non-statutory documents that provide a recognised means of complying with the statutory duties.
Q2. A test engineer proves a voltage indicator is working correctly before and after use on a proving unit or known live source. What is the primary purpose of this step?
  • A.  To calibrate the instrument to the exact supply voltage
  • B.  To confirm the indicator itself has not failed and would reliably show the presence of voltage
  • C.  To satisfy a manufacturer's warranty condition only
  • D.  To record the ambient temperature for the test certificate
Show answer & explanation
✓ Answer: B. To confirm the indicator itself has not failed and would reliably show the presence of voltage
Proving before and after use confirms the voltage indicator is functioning correctly, so a genuine 'dead' reading during isolation can be trusted rather than being caused by a faulty instrument. This is a core part of the HSE-recommended safe isolation procedure (GS38).
Q3. A periodic inspection reveals that the installation was wired to the 15th Edition of the Wiring Regulations and does not fully comply with the current 18th Edition. Is this alone grounds for a C2 code?
  • A.  Yes, any non-compliance with the current edition is always C2
  • B.  No, non-compliance with the current edition alone is not a reason for a code unless it presents a danger
  • C.  Yes, but only if the installation is domestic
  • D.  No, it should always be recorded as C3 regardless of risk
Show answer & explanation
✓ Answer: B. No, non-compliance with the current edition alone is not a reason for a code unless it presents a danger
BS 7671 and GN3 make clear that an installation is not required to be upgraded to comply with every subsequent edition; non-compliance with the current edition is not, by itself, a reason for a C1, C2 or C3 code unless it gives rise to a genuine element of danger. The inspector must assess actual risk, not just edition compliance.
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Statutory & non-statutory requirements · 34
Initial verification sequence · 36
Periodic inspection & EICR coding · 58
Continuity & insulation resistance testing · 36
Polarity, Zs & RCD testing · 35
Documentation & certification · 38

Who has to sit the Inspection & Testing (2391) Prep

Who needs a Inspection & Testing (2391) Prep?

Practicing electricians with 18th Ed. & Level 3 qualifications, inspecting/testing installations & issuing EICRs.

The real Inspection & Testing (2391) Prep: format

How many questions are in the Inspection & Testing (2391) Prep?

The real Inspection & Testing (2391) Prep has 60 questions and lasts 120 minutes. Our mock uses 35 questions in 60 minutes.

What is the Inspection & Testing (2391) Prep pass mark?

Real exam pass mark: Approx. 75%. Our mock marks you at 24 out of 35, the threshold we mark against.

What it costs, and what a resit costs

How much does the Inspection & Testing (2391) Prep cost?

Real exam fee: 103.20. Rebooking after a fail: At least a few days.

How hard is it

How hard is the Inspection & Testing (2391) Prep?

Difficulty: Harder than 18th Edition, tests judgment.

Why people fail it

Why do people fail the Inspection & Testing (2391) Prep?

Figures for the real exam from vertexaisearch.cloud.google.com, checked October 2026. Fees and rules change, so confirm with the test provider before you book.
Inspection & Testing (2391) Prep: common questions
Frequently asked
How long do you get?
The test is timed at 60 minutes. Our full mock runs on the same clock so you can practise your pacing.
Are these the real exam questions?
No. Our questions are original and written to match the current syllabus, so they give realistic practice without copying the official paper. Every answer comes with a plain-English explanation. Always confirm current rules and content with C&G 2391.