18th Edition (BS 7671) Exam Prep: Free Mock Test & Practice Questions

Q: Why do people fail the 18th Edition (BS 7671) Exam Prep?

Common reasons: Running out of time due to inefficient navigation of the regulations; Inability to quickly locate relevant information within the BS 7671 book. Figures checked October 2026.

18th Edition (BS 7671) Exam Prep

C&G 2382-style open-book practice: regs navigation under time pressure.

Written against the published specification.

Pass mark 18/30 60 minutes C&G 2382 style How many can I get wrong?

About this practice. Revision Robin is built and maintained by Bloor Engineering Ltd, a UK-registered company. Our 18th Edition (BS 7671) Exam 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 2382 style. Always confirm current test rules, fees and content with the official provider. See our Terms and Privacy.

Little and often beats one big session. Five minutes on the bus counts.

Free practice questions

Try 3 real 18th Edition (BS 7671) Exam Prep questions

Have a go, then reveal the worked explanation. A taster from a bank of 235 original questions. Unlock for unlimited drills and full timed mocks.

Q1. BS 7671 applies to the design, erection and verification of electrical installations operating at voltages up to and including which limit for a.c.?

A. 1000 V
B. 1500 V
C. 650 V
D. 500 V

Show answer & explanation

✓ Answer: A. 1000 V

BS 7671 covers installations operating at voltages up to and including 1000 V a.c. (and 1500 V d.c.). Above these limits the installation falls outside the scope of the Regulations and other standards apply.

Q2. Automatic disconnection of supply (ADS), the principal method of fault protection in BS 7671, relies on which combination of measures?

A. Basic insulation, protective earthing, and either an overcurrent device or RCD, together with protective equipotential bonding
B. Double insulation, SELV and physical barriers
C. Obstacles, placing out of reach and non-conducting locations
D. Electrical separation, PELV and FELV

Show answer & explanation

✓ Answer: A. Basic insulation, protective earthing, and either an overcurrent device or RCD, together with protective equipotential bonding

ADS combines basic protection (insulation of live parts) with fault protection achieved by connecting exposed-conductive-parts to the protective earthing system, protective equipotential bonding, and a protective device that disconnects the supply automatically should a fault occur. The other options describe alternative or supplementary protective measures, not the core ADS requirement.

Q3. Where a single-phase and a three-phase supply share a common consumer unit enclosure, what does BS 7671 require regarding the isolation of each supply?

A. Each supply must have its own separate means of isolation, and a warning notice must indicate the presence of more than one supply
B. A single isolator can serve both supplies provided it is rated for the combined current
C. No warning notice is needed if both supplies are clearly labelled with coloured tape
D. Only the three-phase supply requires isolation

Show answer & explanation

✓ Answer: A. Each supply must have its own separate means of isolation, and a warning notice must indicate the presence of more than one supply

Regulation 537.1.4 (and related notice requirements) requires separate isolation for each source and a durable warning notice at the point of isolation where more than one supply exists, so that a person isolating one supply is not exposed to a second live source. Coloured tape alone does not satisfy the notice requirement.

Exam mode

Full mock exam

30 random questions, real timing, marked against the official pass mark. Different every time.

The first 8 of 30 questions are free, with your score on them. Finishing the paper, your result against the pass mark and every answer explained come with the paid version.

Practice material only. This is revision practice, not official training, assessment or certification, and not a substitute for the required course or supervised experience. Always confirm the current requirements with the official awarding body or test provider before relying on it.

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Topic drills

Ten quick questions on one topic, marked instantly with explanations.

1 free drill left.

Who has to sit the 18th Edition (BS 7671) Exam Prep

Who needs a 18th Edition (BS 7671) Exam Prep?

Practising electricians in the UK, electrical engineers, contractors, and those needing to join competent person schemes or acquire an ECS card.

The real 18th Edition (BS 7671) Exam Prep: format

How many questions are in the 18th Edition (BS 7671) Exam Prep?

The real 18th Edition (BS 7671) Exam Prep has 60 questions and lasts 120 minutes. Our mock uses 30 questions in 60 minutes.

What is the 18th Edition (BS 7671) Exam Prep pass mark?

Real exam pass mark: 60% (36 out of 60). Our mock marks you at 18 out of 30, the threshold we mark against.

What it costs, and what a resit costs

How much does the 18th Edition (BS 7671) Exam Prep cost?

Real exam fee: £150 (in-centre exam only), £200 (remote exam only). Resit fee: £60 (in-centre), £105 (remote)

How hard is it

How hard is the 18th Edition (BS 7671) Exam Prep?

Difficulty: Challenging, requires efficient navigation of BS 7671 under time pressure, not memorisation.

Why people fail it

Why do people fail the 18th Edition (BS 7671) Exam Prep?

Running out of time due to inefficient navigation of the regulations.
Inability to quickly locate relevant information within the BS 7671 book.

Figures for the real exam from totalskills.uk, elec-mate.com, learnzonemedia.com, checked October 2026. Fees and rules change, so confirm with the test provider before you book.

18th Edition (BS 7671) Exam 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 2382 style.