18th Edition Practice Exam – Paper 2 (Inspection & Testing Focus)

1. Which regulation requires installations to be designed to protect persons, livestock, and property?

A) 411.3.2 B) 131.1 C) 415.1 D) 132.16

2. What is the nominal voltage of low voltage systems as defined in BS 7671?

A) Up to 50 V B) 50–1000 V AC C) 1000–1500 V DC D) Above 1000 V AC

3. Which regulation covers the requirement for competence of persons?

A) 134.1.1 B) 411.4 C) 415.2 D) 132.5

4. What is the maximum disconnection time for a TN system final circuit not exceeding 32 A?

A) 0.1 s B) 0.2 s C) 0.4 s D) 5.0 s

5. Which device provides both overcurrent and residual current protection?

A) MCB B) RCD C) RCBO D) SPD

6. What is the minimum RCD rating for socket-outlets ≤32 A in dwellings?

A) 10 mA B) 30 mA C) 100 mA D) 300 mA

7. Which regulation requires additional protection by RCDs for circuits supplying mobile equipment outdoors ≤32 A?

A) 411.3.3 B) 415.2 C) 132.5 D) 443.4

8. What is the maximum disconnection time for TT systems for final circuits ≤32 A?

A) 1.2 s B) 0.4 s C) 0.2 s D) 5.0 s

9. What is the minimum cross-sectional area of a protective conductor for a 6 mm² live conductor (copper)?

A) 2.5 mm² B) 6 mm² C) 4 mm² D) 10 mm²

10. Which regulation covers requirements for electrical connections?

A) 528 B) 527 C) 526 D) 524

11. Which regulation requires main protective bonding?

A) 411.3.1.2 B) 132.5 C) 415.2 D) 443.4

12. What is the minimum bonding conductor size for gas pipework in a domestic installation (non-PME typical case)?

A) 4 mm² B) 6 mm² C) 10 mm² D) 16 mm²

13. Which regulation defines requirements for isolation?

A) 537.2 B) 411.3.2 C) 132.16 D) 415.1

14. What is the primary purpose of functional switching?

A) To disconnect for safety B) To control normal operation C) To prevent shock D) To protect against overcurrent

15. Emergency switching must be…

A) Lockable B) Readily accessible C) Hidden D) Remote only

16. Which regulation covers switching off for mechanical maintenance?

A) 537.3 B) 411.3.2 C) 132.5 D) 415.1

17. Which device provides protection against short-circuit currents?

A) SPD B) MCB C) RCD D) Isolator

18. What is the maximum earth fault loop impedance (Zs) for a 32 A Type B MCB?

A) 1.37 Ω B) 1.44 Ω C) 1.15 Ω D) 2.42 Ω

19. Which regulation covers coordination of protective devices?

A) 536.4 B) 411.3.2 C) 443.4 D) 415.2

20. Which device is used to protect against transient overvoltages?

A) SPD B) RCBO C) MCB D) Isolator

21. Which regulation requires initial verification of every installation?

A) 641.1 B) 132.5 C) 411.3.2 D) 415.1

22. What insulation resistance test voltage is used for circuits ≤500 V?

A) 250 V B) 500 V C) 1000 V D) 50 V

23. What is the minimum insulation resistance value for low voltage circuits?

A) 0.25 MΩ B) 0.5 MΩ C) 1 MΩ D) 2 MΩ

24. Which test confirms polarity of socket-outlets?

A) Continuity B) Polarity C) Insulation resistance D) Earth fault loop impedance

25. Which regulation requires periodic inspection and testing?

A) 651.1 B) 651.2 C) 132.5 D) 411.3.2

26. What instrument is used to measure earth fault loop impedance?

A) Insulation tester B) Loop tester C) Multimeter D) Clamp meter

27. Which test ensures continuity of protective conductors?

A) Insulation resistance B) Continuity C) Polarity D) RCD test

28. What is the minimum test current used during RCD testing?

A) 15 mA B) 30 mA C) 1 × IΔn D) 5 × IΔn

29. Which regulation requires certification after inspection and testing?

A) 653.1 B) 132.5 C) 411.3.2 D) 415.1

30. Which form is issued after initial verification?

A) Minor works certificate B) Electrical installation certificate C) Periodic report D) Danger notice

31. Which section covers bathrooms?

A) 701 B) 702 C) 708 D) 721

32. What is the minimum IP rating for equipment in Zone 1 of a bathroom?

A) IPX2 B) IPX4 C) IPX5 D) IPX7

33. Which section covers agricultural locations?

A) 705 B) 701 C) 708 D) 721

34. Which section covers caravan parks?

A) 708 B) 701 C) 702 D) 721

35. Which section covers marinas?

A) 709 B) 701 C) 702 D) 708

36. Which section covers medical locations?

A) 710 B) 701 C) 702 D) 708

37. Which section covers EV charging installations?

A) 722 B) 701 C) 702 D) 708

38. What is the minimum RCD rating required for EV charging points?

A) 10 mA B) 30 mA C) 100 mA D) 300 mA

39. Which section covers temporary installations for construction sites?

A) 704 B) 701 C) 702 D) 708

40. Which section covers exhibitions, shows, and stands?

A) 711 B) 701 C) 702 D) 708

41. Which regulation introduced AFDDs for certain circuits?

A) 421.1.7 B) 443.4 C) 415.2 D) 132.5

42. AFDDs are primarily designed to protect against…

A) Overcurrent B) Arc faults C) Surge voltages D) Earth leakage

43. Which regulation requires SPDs where overvoltage consequences could be serious?

A) 443.4 B) 411.3.2 C) 415.1 D) 132.16

44. Which section covers prosumer installations?

A) Part 8 B) 701 C) 702 D) 708

45. Which regulation requires consideration of energy efficiency in design?

A) Appendix 17 B) 411.3.2 C) 415.1 D) 443.4

46. Proximity of wiring systems to other services is covered by:

A) 527 B) 526 C) 524 D) 528

47. Which regulation requires protective devices to be selected considering coordination?

A) 536.3 B) 411.3.2 C) 415.1 D) 443.4

48. Which regulation requires consideration of external influences?

A) 301.1 B) 411.3.2 C) 415.1 D) 443.4

49. Which regulation requires an electrical installation certificate after completion?

A) 653.1 B) 132.5 C) 411.3.2 D) 415.1

50. Which certificate is issued for minor alterations?

A) Minor works certificate B) Electrical installation certificate C) Periodic report D) Danger notice

51. Which report is issued after periodic inspection?

A) Electrical installation certificate B) Electrical installation condition report C) Minor works certificate D) Danger notice

52. Which regulation requires records to be kept of inspection and testing?

A) 651.4 B) 132.5 C) 411.3.2 D) 415.1

53. Which regulation requires safety documentation to be available to users?

A) 514.9 B) 132.5 C) 411.3.2 D) 415.1

54. Which regulation requires cables to be selected considering current‑carrying capacity?

A) 523.1 B) 411.3.2 C) 415.1 D) 443.4

55. Which regulation requires cables to be protected against mechanical damage?

A) 522.6.1 B) 411.3.2 C) 415.1 D) 443.4

56. Protection against spread of fire in wiring systems is covered by:

A) 523 B) 527 C) 522 D) 528

57. Which regulation requires cables in escape routes to be supported against premature collapse?

A) 521.10.202 B) 411.3.2 C) 415.1 D) 443.4

58. Which regulation requires consideration of voltage drop in cable design?

A) 525.1 B) 411.3.2 C) 415.1 D) 443.4

59. What is the maximum voltage drop allowed for lighting circuits?

A) 3% B) 5% C) 10% D) 15%

60. What is the maximum voltage drop allowed for other circuits?

A) 3% B) 5% C) 10% D) 15%

WOODS-TEC

18th Edition Wiring Regulations Practice Exam – Paper 1

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