2382-622 Understand the Requirements of Electrical Installations BS 7671

1. Which is within the scope of BS 7671?

2. What is the maximum nominal DC voltage covered by the requirements of BS 7871?

3. What Part of BS 7871 relates directly to functional requirements?

4. Which of the following is a means of achieving basic protection to satisfy the fundamental principles of BS 7871?

5. Which symbol is used to denote the total earth fault loop impedance of a circuit within an installation?

6. Which conductors do R₁ + R₂ refer to when calculating a final circuit Z_s?

7. What is the first letter of an earthing system where no live part is directly connected to earth?

8. It is recommended that a two-storey dwelling should have a minimum of two lighting circuits.

Which is reason for this recommendation?

9. Who is responsible for considering measures to reduce the electromagnetic interference in an installation?

10. Which characteristics of equipment should be assessed for harmful effects upon other electrical equipment?

11. What can facilitate safe inspection, testing and maintenance of installations?

12. Which of the following should be consulted, with regard to compatibility, if any installation equipment is likely to have a significant influence on the supply?

13. What type of premise must comply with additional requirements for circuits with luminaires when ADS is used for fault protection?

14. What is the maximum rating, for ta final circuit supplying only fixed connected equipment, that must comply with the requirements of Table 41.1?

15. What is the highest rating of a socket-outlet, for use by ordinary persons, where BS 7671 requires additional protection by means of an RCD?

16. Which can provide basic protection as defined in BS 7671?

17. Which condition must apply when an installation uses more than one protective measure against faults?

18. What is the minimum degree of protection for the horizontal top surface of a barrier or enclosure which is readily accessible?

19. Which measure must include protective earthing as a part of ADS?

20. Which is not a measure for fault protection?

21. What is the maximum permitted earth fault loop impedance for a distribution circuit protected by a BS 88-2 general purpose 32 A fuse as part of a TN system?

23. Installed electrical equipment which contains a significant quantity of flammable liquid requires measures to prevent the spread of the liquid?

What is to be the minimum quantity to be considered significant as given in BS 7671?

23. Which is a requirement with regard to any temperature cut-out device where a particular risk of fire exists?

24. What is the minimum rated conditional short-circuit current of a busbar trunking system complying with BS EN 61439-6?

25. What must all overcurrent protective devices, without back-up protection on the supply side, be capable of?

26. What is the minimum distance between information technology cables and discharge lamps, when considering segregation of circuits to reduce electromagnetic disturbance?

27. Which is included within the scope of Chapter 46?

28. What is the maximum permitted residual opening current for an RCD selected to protect a TT installation having an earth electrode resistance of 2 Ω?

29. A circuit has expected earth leakage current downstream of an RCD.

What is the maximum percentage of the RCD’s residual operating current that is permitted in order to reduce the risk of unwanted tripping?

30. What circumstances would require a warning notice of maximum voltage to Earth present as given in BS 7671?

31. What is the correct procedure with regard to a durable copy of a schedule relating to a consumer unit in an industrial premises?

32. What BS EN standard must a power track system comply with?

33. What must protect a flat profile PVC/PVC cable which is installed directly within a partition having metal parts?

34. Which one of the following systems shall not use single-core steel wire armour cable due to electromagnetic effects?

35. What standard must a residual current monitor comply with?

36. Which is a requirement of BS 7671 where an ordinary person may modify the setting or calibration of a circuit-breaker?

37. What is the minimum cross-sectional area of a steel earthing conductor buried in soil and not protected against corrosion or mechanical damage?

38. What is the purpose of connecting main protective bonding to installation pipework?

39. Why should consideration be given to the inclusion of a neutral conductor at a light switch position?

40. What is the minimum csa of a single-core, stranded copper conductor for an auxiliary control circuit?

41. What is the changeover time for an automatic safety circuit classified as short break?

42. Which type of circuit would require a check of phase sequence?

43. What information, relating to a complex installation, must be provided on a legible diagram, chart or table?

44. Which item of information shall be made available to the person carrying out an inspection and test in an industrial installation?

45. What test voltage is applied to a FELV circuit, connected to a 230/25 V transformer, when tested for insulation resistance?

46. What is the minimum height for overhead conductors in a marina for pleasure craft, that are subject to vehicle movement?

47. What is the minimum degree of protection required for electrical equipment installed within a sauna where cleaning water jets are used?

48. What is the minimum distance that a fixed radiant heating appliance should be installed, from livestock, in the absence of manufacturers guidance?

49. Which SELV source shall not be used when supplying equipment in zone 1 of a swimming pool?

50. What is the minimum cross-sectional area of a flexible cable for a caravan connection having a rating of 16 A?

51. What is the minimum degree of protection for electrical equipment installed for normal use within a castle shed?

52. What is the preferred interval that wiring systems installed in caravan, which is not frequently used, be inspected?

53. Which mode means a Prosumer’s installation acts as a producer?

54. Which test may require alternative methods when verifying a PEI?

55. What does the acronym EEMS stand for when used in relation to Prosumer’s electrical installation?

56. What would be the approximate disconnection time, in the event of an earth fault, for a 30 A BS 3036 fuse protecting a circuit with a Z_s value of 1.09 Ω?

57. Which grouping factor should be applied when a common conduit from a lighting distribution board contains four fully loaded individual circuits?

58.A 230 V single-phase supplying a pump motor is protected by a 20 A Type B circuit breaker to BS EN 60898.

What is the minimum value of fault current to cause disconnection between 0.1s and 5.0s?

59. What is the rating factor to apply when calculating the current carrying capacity of a 90^oC thermosetting cable installed in an ambient air temperature of 40^oC?

60. What is the approximate value of fault current if a 60 A BS 3036 protective device operates 5 seconds after a fault develops?