Free mock exam
18th Edition Mock Exam (BS 7671:2018+A4:2026)
Free 18th Edition mock exam covering BS 7671:2018 Amendment 4 (2026) — a timed practice exam with a worked answer on every question. 30 questions pulled from a 377-question bank: Chapter 41 protection against electric shock and maximum Zs, RCD selection and the Type AC restriction, AFDDs under Reg 421.1.7, Section 722 EV charging, supplementary bonding, Section 701 special locations, and inspection and testing, plus what changed in A4:2026 (protective neutral bonding, Table 52.1, Chapter 57 batteries, Section 545). Retake it as often as you like — every attempt draws a fresh mock test from the bank, so it works as an exam simulator for the real open-book paper.
- Questions
- 30
- Time limit
- 60 min
- Pass mark
- 60% · 18/30
- Question bank
- 377
Free, no sign-up. Retake as many times as you like — different questions each time.
Sample questions
01Which regulation in BS 7671 sets the general requirement for initial verification?
- ARegulation 314.1
- BRegulation 641.1
- CRegulation 521.8
- DRegulation 411.3.3
Why: Regulation 641.1 requires every installation to be inspected and tested during erection and on completion, before being put into service, to verify so far as is reasonably practicable that BS 7671 has been met. Regulation 643.1 is the general clause for the testing part of initial verification.
02Which regulation requires that circuits supplying portable outdoor equipment be RCD protected?
- ARegulation 643.1
- BRegulation 521.8
- CRegulation 314.1
- DRegulation 411.3.3
Why: Regulation 411.3.3 mandates RCD protection for circuits supplying portable outdoor equipment.
03What is the minimum acceptable insulation resistance value for a 230V circuit?
- A5 MΩ
- B1 MΩ
- C0.5 MΩ
- D2 MΩ
Why: BS 7671 requires a minimum insulation resistance of 1 MΩ for circuits up to 500V.
How the real 18th Edition exam works
The City & Guilds 2382-26 is the current 18th Edition exam, written against BS 7671:2018+A4:2026. It is one online multiple-choice test of 60 questions in 120 minutes, and the pass mark is set at about 60%, so roughly 36 correct. Answer every question.
It is open book, but the only permitted book is BS 7671:2018+A4:2026 itself. City & Guilds allows bookmarks (blank or numbered sticky tabs, folded corners), highlighting and short notes that cross-reference another part of the book. Detailed notes, written answers, sample questions and extra diagrams are not allowed, and a centre can swap your copy for a clean one if it is in doubt. The On-Site Guide and Guidance Notes stay outside. A copy marked +A2:2022 will not do: it has no Chapter 57, Section 545 or Section 716. You also need a non-programmable calculator.
Two minutes a question sounds generous until a cable-sizing or Zs question takes five. Finding a regulation quickly is a skill in its own right, which is why this mock keeps the same two minutes per question.
Where the 60 questions come from
City & Guilds publishes how the paper is split across the book. Parts 4 and 5 carry 29 of the 60 questions, so that is where your tabs and your revision time should go first. Nearly every question sends you to a regulation or a table, so knowing where things live is worth more than memorising them.
- Part 1, Scope and fundamental principles (4 questions). What BS 7671 covers and what it does not. Chapter 13 sets the principles everything else builds on.
- Part 2, Definitions (2 questions). Only two questions test definitions directly, but many others turn on one: exposed-conductive-part, extraneous-conductive-part, skilled person, instructed person.
- Part 3, Assessment of general characteristics (6 questions). Earthing arrangements in 312.2, including TN-C-S (PNB), the arrangement A4:2026 added alongside PME (Figure 3.9B).
- Part 4, Protection for safety (15 questions). The most examined part, a quarter of the paper. Chapter 41 has the disconnection times in Table 41.1, the Zs rule in Regulation 411.4.4 and the maximum Zs tables, 41.2 to 41.4. Chapter 42 has AFDDs (421.1.7) and non-combustible consumer units (421.1.201). Chapter 43 covers overcurrent, including Ib ≤ In ≤ Iz in 433.1.1. Chapter 44 has surge protection in Section 443.
- Part 5, Selection and erection (14 questions). Chapter 52 for wiring systems and cables in walls (522.6.202 and Table 52.1, new in A4). Chapter 53 for RCD types (Type AC only for fixed equipment, 531.3.3). Chapter 54 for earthing and protective conductors (Tables 54.7 and 54.8). Chapter 57 for stationary batteries, new in A4.
- Part 6, Inspection and testing (4 questions). Chapter 64 for initial verification and Chapter 65 for periodic inspection. The RCD test (Regulations 643.7.1 and 643.8) is a single AC test at the rated residual current.
- Part 7, Special installations or locations (7 questions). Bathrooms (701), swimming pools (702), construction sites (704), agricultural premises (705), caravan parks (708), medical locations (710), solar PV (712), power over ICT cables (716), EV charging (722) and heating systems (753). Each section only changes or adds to the general rules, so read the scope first.
- Part 8 and the Appendices (8 questions). Chapter 81 on energy efficiency and Chapter 82 on prosumer installations. Appendix 3 for the time/current curves, Appendix 4 for current-carrying capacity, rating factors and voltage drop, and Appendix 6 for the model forms.
What Amendment 4:2026 changed
Amendment 4 was issued on 15 April 2026, and the A2 and A3 versions were withdrawn on 15 October 2026. The 2382-26 examines the whole book, but expect questions on what is new. The main changes:
- TN-C-S (PNB) added to the earthing arrangements in 312.2.1.1.
- AFDD Regulation 421.1.7(a) now says high rise residential buildings.
- Table 52.1 for cables concealed in walls and partitions.
- New Section 545 on functional earthing for ICT equipment.
- New Chapter 57 for stationary secondary batteries.
- New Section 716 for power over ICT cabling (Power over Ethernet), and a major revision of Section 710 for medical locations.
- New Chapter 81 on energy efficiency, replacing Appendix 17.
- Model form changes in Appendix 6: an FI observation no longer has to make an EICR unsatisfactory.
Rules people credit to the wrong amendment
Several rules that feel new were in force long before A4, and dates come up. Requiring AFDDs (rather than recommending them) for socket circuits in high rise flats, HMOs, purpose-built student accommodation and care homes came in A2:2022. So did the single RCD test at the rated residual current, replacing the old multiple tests. Section 722 for EV charging arrived in A1:2020. RCD protection for domestic lighting circuits (411.3.4) and the 0.95 Cmin factor behind the maximum Zs tables date from the 2018 edition itself.
How to use this mock exam
Sit it with your tabbed BS 7671 open beside you, as you will on the day. When the timer ends, read every explanation, including the ones you got right: a right answer found by guessing will not be there next time. The results show which topics cost you marks, and the topic pages above let you drill just those. When you are scoring 70% or more with time to spare, sit two papers back to back for a full two-hour rehearsal.
Common questions
Is the 18th Edition mock exam free?
Yes, it is free with no sign-up needed. Questions are pulled at random from a substantial bank, with a worked explanation on every question after you submit.
Can I retake the mock exam?
Yes. Every attempt picks a different random selection and reshuffles the options, so each retake gives you genuinely new questions. No limit on retakes.
Does this count as a qualification?
No. This is independent practice material and does not award a qualification, card or certificate. Where a subject has a formal qualification or card, you gain it through an approved provider.
Is this mock exam like the real C&G 2382 18th Edition exam?
The real 2382-26 is one online test of 60 multiple-choice questions in 120 minutes, with a pass mark of about 60%. It is open book, but only BS 7671:2018+A4:2026 is allowed: bookmarks, highlighting and short cross-reference notes are fine, detailed notes and the On-Site Guide are not. This mock uses the same multiple-choice format, regulation coverage and 60% pass mark in a shorter 30-question, 60-minute sitting, so the time per question matches the real paper (2 minutes). Sit two back to back for a full-length rehearsal.
Does this mock exam cover Amendment 4 (A4:2026)?
Yes. The question bank is written against BS 7671:2018+A4:2026, the current edition, including the changes A4:2026 itself made (protective neutral bonding, Table 52.1 for cables in walls, Chapter 57 and Section 545) as well as rules from earlier amendments that are still examined, such as AFDDs in Regulation 421.1.7, the Type AC RCD restriction and Section 722 EV charging.
Can I practise specific 18th Edition topics instead of a full paper?
Yes — below the exam there are topic-by-topic practice pages drawn from the same bank, so you can drill just Chapter 41, special locations, or inspection and testing before sitting a full timed mock.
Should I use the book during this mock exam?
Practise the way you will sit the paper: the real 2382 is open book, and finding a regulation quickly matters as much as knowing it. Using a tabbed copy of BS 7671 under the timer is exactly the skill the exam tests — if a lookup takes you more than two minutes, tab that chapter.