Inspection & Testing (2391) Prep: Free Mock Test & Practice Questions

Inspection & Testing (2391) Prep

C&G 2391 initial verification & periodic inspection.

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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

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✓ 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

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✓ 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

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✓ 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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Inspection & Testing (2391) Prep — common questions

Frequently asked

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

The exam has 35 questions. Every Revision Robin mock uses the same 35-question format so your practice matches the real thing.

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

You need 24 out of 35 correct to pass, which is about 69%. Our mocks mark you against this exact threshold.

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.