Free 18th Edition mock exam

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Your score against the pass mark, how you did in each Part of BS 7671, and every question explained with the regulation and the route through your book.

1. Sample 1 of 5 Part 4

   An apprentice needs to check the requirements for SELV and PELV systems. Which section of Chapter 41 should they turn to?

   A Option A: Section 411 B Option B: Section 412 C Option C: Section 413 D Option D: Section 414

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   Answer D: Section 414

   Section 414 covers protection by extra-low voltage provided by SELV and PELV. Within Chapter 41, Section 411 is automatic disconnection of supply, 412 is double or reinforced insulation and 413 is electrical separation.

   Section 414

   Find it in your book

   1. Part 4
   2. Chapter 41
   3. Section 414
2. Sample 2 of 5 Part 5

   While checking Table 51 for an installation that includes IT equipment, a learner sees a conductor function identified by the colour pink. Which conductor is it?

   A Option A: Protective conductor B Option B: Functional earthing conductor C Option C: PEN conductor D Option D: Mid-wire of a DC system

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   Answer B: Functional earthing conductor

   Amendment 2 allocated pink in Table 51 to the functional earthing conductor. Functional earthing serves purposes other than electrical safety, so it is kept visually distinct from green-and-yellow protective conductors. A PEN conductor is identified using green-and-yellow and blue in combination, not pink.

   Reg 514.3.1; Table 51

   Find it in your book

   1. Part 5
   2. Chapter 51
   3. 514.3
   4. Table 51
3. Sample 3 of 5 Part 8 + App.

   An electrician revising from A2 notes looks for guidance on energy efficiency in Appendix 17. Where is this subject covered in BS 7671:2018+A4:2026?

   A Option A: Chapter 57 in Part 5 B Option B: Chapter 81 in Part 8 C Option C: Section 716 in Part 7 D Option D: Appendix 16

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   Answer B: Chapter 81 in Part 8

   Amendment 4 introduced Chapter 81, Energy efficiency, in Part 8 and deleted Appendix 17. Chapter 57 covers stationary secondary batteries, Section 716 covers Power over Ethernet and Appendix 16 covers devices for protection against overvoltage.

   Chapter 81

   Find it in your book

   1. Part 8
   2. Chapter 81
4. Sample 4 of 5 Part 7

   When looking up Regulation 701.411.3.3, what does the '411.3.3' part of the number tell you?

   A Option A: It is the page number of the bathroom section B Option B: It is the 411th regulation within Section 701 C Option C: It shows the regulation supplements or modifies general Regulation 411.3.3 D Option D: It identifies the product standard for bathroom RCDs

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   Answer C: It shows the regulation supplements or modifies general Regulation 411.3.3

   Part 7 regulations are numbered 7xx.yyy, where 7xx is the section (701 is bathrooms) and yyy mirrors the general regulation being supplemented or modified. 701.411.3.3 therefore relates to 411.3.3, additional protection by RCD. Knowing this lets you move quickly between the general rule and the special-location rule.

   Reg 701.411.3.3; 411.3.3

   Find it in your book

   1. Part 7
   2. Section 701
   3. 701.411.3.3
5. Sample 5 of 5 Part 3

   An electrician is working out the maximum demand of a small office installation. What does 311.1 allow them to take into account when doing so?

   A Option A: Diversity between loads B Option B: The prospective fault current at the origin C Option C: The external earth fault loop impedance D Option D: The insulation resistance of the wiring

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   Answer A: Diversity between loads

   311.1 requires the maximum demand to be determined and permits diversity to be taken into account, recognising that not every load runs at full rating at the same time. The other options are supply or test values, not factors in assessing demand.

   Reg 311.1

   Find it in your book

   1. Part 3
   2. Chapter 31
   3. 311.1
6. The full free paper

   20 questions against the clock.

   40 minutes, every Part of BS 7671, then your score by Part with every answer explained.

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