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100+ Free City & Guilds 2391-50 Practice Questions

Pass your City & Guilds 2391-50 Level 3 Award in Initial Verification & Certification of Electrical Installations exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: City & Guilds 2391-50 Exam

100

Practice Questions

OpenExamPrep

~40

Theory Test Questions

City & Guilds

80 min

Open-Book Theory Test

City & Guilds

Level 3

Award Level

City & Guilds

BS 7671

Standard Applied

IET

Initial

Verification (new installs)

City & Guilds

The City & Guilds 2391-50 Level 3 Award in Initial Verification & Certification of Electrical Installations is a UK qualification for electricians who inspect, test and certify new installations to BS 7671:2018+A2:2022. It is assessed by an online open-book multiple-choice theory test of around 40 questions in 80 minutes (City & Guilds e-volve) plus a separate practical assessment. It is distinct from the 2391-51 (periodic) and 2391-52 (combined) awards, focusing on initial verification: safe isolation, the prescribed sequence of tests, continuity and ring final circuits, insulation resistance, polarity, earth electrode resistance, loop impedance (Zs = Ze + R1+R2), prospective fault current, RCD testing, and completing the Electrical Installation Certificate. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample City & Guilds 2391-50 Practice Questions

Try these sample questions to test your City & Guilds 2391-50 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which document is the statutory regulation that BS 7671 supports for electrical installations in the UK?
A.BS 7671:2018+A2:2022
B.The Electricity at Work Regulations 1989
C.IET Guidance Note 3
D.The On-Site Guide
Explanation: The Electricity at Work Regulations 1989 (EAWR) is statutory law. BS 7671 is a non-statutory British Standard, but compliance with it is widely accepted as satisfying the relevant duties of the EAWR, which is why initial verification is required.
2IET Guidance Note 3 primarily provides detailed guidance on which activity?
A.Cable selection and protection coordination
B.Inspection and testing of electrical installations
C.Earthing and bonding design
D.Special locations such as bathrooms
Explanation: Guidance Note 3 (Inspection & Testing) is the IET publication that expands on Part 6 of BS 7671, giving detailed methods, test sequences and example certificate forms for initial verification and periodic inspection.
3Which part of BS 7671:2018+A2:2022 covers inspection and testing?
A.Part 4
B.Part 5
C.Part 6
D.Part 7
Explanation: Part 6 of BS 7671 covers Inspection and Testing, including Chapter 64 (Initial Verification) and Chapter 65 (Periodic Inspection and Testing). The 2391-50 award is built around Part 6 initial verification requirements.
4What is the main purpose of initial verification of a new electrical installation?
A.To assess the remaining life of an existing installation
B.To confirm the installation complies with BS 7671 before it is put into service
C.To record deterioration over time
D.To value the installation for insurance
Explanation: Initial verification (Chapter 64) confirms by inspection and testing that a new installation, addition or alteration complies with BS 7671 and is safe to put into service. Assessing deterioration over time is the role of periodic inspection.
5Which certificate is issued following the initial verification of a new installation?
A.Electrical Installation Condition Report (EICR)
B.Minor Electrical Installation Works Certificate only
C.Electrical Installation Certificate (EIC)
D.PAT test certificate
Explanation: The Electrical Installation Certificate (EIC) is issued on completion of initial verification of a new installation, addition or alteration that includes a new circuit. An EICR is the output of a periodic inspection of an existing installation.
6Before any dead testing begins, which procedure must always be carried out first?
A.Insulation resistance testing
B.Safe isolation of the installation
C.Earth fault loop impedance testing
D.Functional testing of RCDs
Explanation: Safe isolation must be carried out before dead testing to ensure conductors are disconnected, proved dead with an approved voltage indicator (proved on a known source before and after), and secured against reconnection. This protects the tester from electric shock.
7When proving a voltage indicator before safe isolation, the GS38-compliant device should be tested on what?
A.The circuit being isolated only
B.A known live source or a proving unit
C.A multimeter on the ohms range
D.An insulation resistance tester
Explanation: The voltage indicator must be proved on a known live source or a proprietary proving unit immediately before and after testing for the absence of voltage. This confirms the device itself is functioning, in line with HSE Guidance Note GS38.
8Why must test instruments used for initial verification be regularly calibrated?
A.To comply with the manufacturer's warranty only
B.To ensure readings are accurate and traceable to national standards
C.To increase the test voltage output
D.To reduce the cost of testing
Explanation: Instruments must be calibrated so that recorded results are accurate and traceable to national standards. An uncalibrated instrument could give misleading readings, causing a non-compliant installation to be certified as safe. Calibration is typically checked annually with regular accuracy checks between calibrations.
9To which British Standard should test instruments for initial verification conform?
A.BS EN 61557
B.BS EN 60898
C.BS EN 61008
D.BS 88
Explanation: BS EN 61557 is the series of standards specifying the requirements for the electrical safety test equipment used to verify low-voltage installations, covering continuity, insulation resistance, loop impedance and RCD testers.
10Inspection during initial verification is normally carried out with the installation in which state?
A.Energised and on load
B.De-energised (isolated)
C.Under fault conditions
D.At reduced voltage only
Explanation: Inspection is generally carried out with the installation disconnected (de-energised) so that the tester can safely examine equipment, connections, enclosures and conductor selection. Inspection precedes testing in the verification process.

About the City & Guilds 2391-50 Exam

The City & Guilds 2391-50 Level 3 Award covers the initial verification and certification of new electrical installations to BS 7671:2018+A2:2022. It focuses on the inspection and prescribed sequence of dead and live tests (continuity, ring final circuits, insulation resistance, polarity, earth electrode resistance, Ze/Zs, prospective fault current and RCD testing) and on completing the Electrical Installation Certificate. Assessment is an online open-book multiple-choice theory test plus a practical assessment.

Assessment

An online open-book multiple-choice theory test of approximately 40 questions in 80 minutes (City & Guilds e-volve), plus a separate practical assessment of initial verification and certification. This practice bank is 100 selected-response items covering the theory.

Time Limit

80 minutes (online theory test), plus a longer practical assessment

Passing Score

Pass mark set by City & Guilds for the theory test (commonly around 60%); practical assessment is pass/fail

Exam Fee

Bundled into the approved-centre course fee, typically £400-£600 (varies by provider) (City & Guilds)

City & Guilds 2391-50 Exam Content Outline

10%

Statutory & Non-Statutory Documents

EAWR 1989, BS 7671 Part 6, Guidance Note 3, the On-Site Guide, and the purpose of initial verification

16%

Initial Verification Requirements

Safe isolation, instrument selection and calibration (BS EN 61557), visual inspection items, and labelling and notices

8%

Sequence of Tests

The prescribed order of dead and live tests under Regulations 643.2-643.11 and why the sequence matters

22%

Continuity & Ring Final Circuits

Continuity of protective conductors and bonding, R1+R2 and wander-lead methods, and the three-step ring final test

19%

Insulation Resistance & Polarity

Insulation resistance test voltages and minimum values, and confirming correct polarity at devices and accessories

16%

Earthing, Loop Impedance & Fault Current

Earth electrode resistance (TT), Ze, Zs = Ze + (R1+R2), and prospective short-circuit and earth fault current

9%

RCD, Functional Testing & Certification

RCD operating times, functional testing, and completing the EIC, Schedule of Inspections and Schedule of Test Results

How to Pass the City & Guilds 2391-50 Exam

What You Need to Know

  • Passing score: Pass mark set by City & Guilds for the theory test (commonly around 60%); practical assessment is pass/fail
  • Assessment: An online open-book multiple-choice theory test of approximately 40 questions in 80 minutes (City & Guilds e-volve), plus a separate practical assessment of initial verification and certification. This practice bank is 100 selected-response items covering the theory.
  • Time limit: 80 minutes (online theory test), plus a longer practical assessment
  • Exam fee: Bundled into the approved-centre course fee, typically £400-£600 (varies by provider)

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

City & Guilds 2391-50 Study Tips from Top Performers

1Memorise the dead-then-live test sequence: continuity, ring final continuity, insulation resistance, polarity, then Ze/Zs, PFC, RCD and functional tests
2Learn the key test values cold: 500 V/1 MΩ insulation resistance (250 V/0.5 MΩ for SELV/PELV), continuity ohmmeter 200 mA, and Zs = Ze + (R1+R2)
3Know the RCD times: no trip at 0.5x, <=300 ms at 1x, and <=40 ms at 5x for additional protection
4Practise the three-step ring final circuit test and why varying step-3 readings indicate a fault
5Because the theory test is open book, drill looking up BS 7671 regulation numbers and Table 64 quickly under time pressure
6Complete all 100 practice questions and review every miss with the AI tutor before sitting the exam

Frequently Asked Questions

How many questions are on the City & Guilds 2391-50 theory test and how long is it?

The online multiple-choice theory test typically has around 40 questions to be answered in 80 minutes, and it is open book so you may use BS 7671. There is also a separate practical assessment of initial verification and certification.

Is the 2391-50 exam open book?

Yes. The online multiple-choice theory test is open book, so you can refer to BS 7671:2018+A2:2022 and Guidance Note 3. Many questions require you to look up regulation numbers and tabulated values quickly, so practise navigating the standard.

What is the difference between 2391-50, 2391-51 and 2391-52?

2391-50 covers initial verification and certification of new installations (EIC). 2391-51 covers periodic inspection and condition reporting (EICR). 2391-52 is the combined award covering both initial verification and periodic inspection.

What topics does the 2391-50 cover?

It covers statutory and non-statutory documents, safe isolation and instruments, the sequence of tests, continuity and ring final circuits, insulation resistance, polarity, earth electrode resistance, Ze and Zs, prospective fault current, RCD testing, functional testing, and completing the Electrical Installation Certificate.

Do I need the 18th Edition before taking 2391-50?

It is strongly recommended. The 2391-50 assumes a working knowledge of BS 7671:2018+A2:2022, so most candidates hold the 18th Edition (2382) award and have practical installation experience before starting.

Is this free 2391-50 practice as good as paid prep?

Our 100 practice questions cover the same initial-verification content as the 2391-50 syllabus, with a teaching explanation and the relevant BS 7671 reasoning for every answer, plus free daily AI tutor interactions. All content is free forever and updated for 2026.