2382-18 Mock Paper B | ascotcollege

C & G 2382-18 , 2018; revision paper B

31. A BS EN 60309 plug and socket-outlet rated at 63A may be used for which purpose

a). isolation

b). emergency switching

c). functional switching

d). firefighters switch

32. The selection of the means of connection need not take account of which one of the following;

a). The material of the conductor and its insulation

b). The cross-sectional area of the conductor

c). The prospective design current to be carried

d). The number and shape of the wires forming the conductor

33. Where a power cable is in the proximity of or crosses an underground telecommunications cable there should be

a minimum clearance of;

a). 50mm

b). 75mm

c). 100mm

d). 300mm

34. Where an RCD provides for the protection against the risk of fire, it should have a rated residual operating current not exceeding

a). 30mA

b). 300mA

c). 100mA

d). 10mA

35. Where protection against the effects of direct lightning strokes to a supply system is provided by the application of surge protection devices utilizing the Lightning Protection Zone concept, Critical equipment is located in;

a). LPZ 0

b). LPZ 1

c). Boundary of LPZ1

d). LPZ 2

36. When calculating the size of a protective conductor, the k factor for the steel armour used as a protective conductor,

for a cable with 90˚C thermosetting insulation is

a). 85

b). 51

c). 64

d). 46

37. High integrity protective connection (earthing) shall be utilized for all circuits intended to supply one or more items

of equipment where the total protective conductor current is likely to exceed

a). 3.5mA

b). 10 mA

c). 15mA

d). 30mA

38. A radial final circuit feeding socket-outlets supplying several items of data processing equipment has a total protective

conductor current in normal service of 18mA. This circuit must have a high integrity protective conductor

a). of cross-sectional area less than 1 mm²

b). connected as a ring

c). controlled by an isolator

d). enclosed in insulated conduit only.

39. An uninterruptible power supply source shall comply with

a). BS 3036

b). BS 1361

c). BS EN 60898

d). BS EN 62040-1

40. Where an autotransformer is connected to a circuit having a neutral conductor, the common terminal of the winding shall

be connected to the

a). neutral conductor

b). line conductor

c). protective conductor

d). bonding conductor.

41. When selecting wiring systems for safety-services, the cables that could be used in fire conditions may comply with

a). IEC 5266

b). BS 60439-3

c). BS EN 60898

d). IEC 60331-2

42. When carrying out a visual inspection of an electrical installation, which one of the following does not have to be verified?

a). The methods of protection against electric shock

b). The electricity supplier

c). The connection of conductors

d). The presence of under-voltage protective devices

43. When surge protection devices are installed, the total ‘lead length’ of connecting conductors should preferably not exceed

a). 600mm

b). 1.4m

c). 0.5m

d). 4mm

44. When carrying out an inspection of a new installation, it is not necessary to verify the

a). total earth fault loop impedance for each circuit

b). connection of conductors

c). methods of protection against electric shock

d). Presence of diagrams, instructions and similar information.

45. An insulation resistance test is to be carried out on a 3-phase 400 V circuit. The test voltage and minimum acceptable reading would be

a). 250 V a.c. and 0.5 MΩ

b). 500 V d.c. and 0.5 MΩ

c). 500 V d.c. and 1 MΩ

d). 800 V d.c. and 0.5 Ω

46. When an addition is made to an existing installation, the contractor shall record on the Electrical Installation Certificate

or the Minor Electrical Installation Works Certificate any

a). changes in ownership

b). records of repair over the last five years

c). defects found in the existing installation

d). voltage drop in the longest circuit.

47. After completion of a periodic inspection, the completed documentation shall be given to the

a). person ordering the inspection

b). local authority

c). insurance company

d). main contractor.

48. In a room containing a bath, electrical equipment installed in zone O shall have a degree of protection of at least

a). IP44

b). IP4X

c). IP7X

d). IPX7

49. A flush downlighter in the ceiling less than 2.25 m height above floor level over a bath will need to fulfil the requirements of

zone 2
zone 1
zone O
outside of zones, so no special requirements

50. Which of the following protective measures is permitted in a room containing a bath or shower?

a). Obstacles

b). Placing out of reach

c). Automatic disconnection of supply

d). Non-conducting location

51. In a swimming pool or other basin, the metallic covering or sheath of a wiring system in zones 0, 1 or 2 shall

not be used
not be earthed
be connected to the supplementary bonding
have reinforced insulation.

52. The requirements of Section 704 of BS 7671 apply to

cloakrooms
offices
construction and demolition site installations
toilets

53. In locations where livestock is kept, for all circuits other than socket-outlet circuits, an RCD shall be provided with a rating not exceeding

500mA
300 mA
100mA
30mA.

54. Equipment on a pontoon in a marina that is subject to impact to level AG2 should have a mechanical protection code of

IPX4
IPX8
IP55
IK08.

55. For marinas, the classification of external influence which does not need to be considered is

56 In caravans, each final circuit shall be protected against Over-current by a device that disconnects

all live conductors in that circuit
the line conductors only
line, neutral and protective conductors
the caravan and site supply system.

57 Electric dodgems shall only be operated at voltages not exceeding

120Va.c.or 50Vd.c.
50 V a.c. or 120 V d.c.
110 V a.c. reduced low voltage
1000 V a.c. or 1500 V d.c.

58 In Group 1 and Group 2 Medical locations, the maximum voltage present between simultaneously accessible exposed-conductive-parts and/or extraneous-conductive-parts shall not exceed

60V AC
50V AC
50V DC
25V AC

59. The correct Rating factor for a 90ºC thermosetting cable operating at 35ºC ambient temperature is

0.91
0.94
0.96
1.02

60 External influences coded BE are classified as

nature of processed or stored materials
conditions of evacuation in an emergency
movement of air
capability of persons.

Answer Paper 2

31 A Table 537.4 Guidance on selection of protective, isolation and switching devices

32 C 526.2 Electrical connections

33 C 528.2 Proximity of communication cables

34 B 532.2 RCD’s and fire protection

35 D 534.1 (Fig 534.1) Devices for protection against overvoltage

36 D Table 54.4 Protective conductors

37 B 543.7.1.203 Earthing requirements – high integrity

38 B 543.7.2.201 (ii)(a) Earthing requirements – high integrity

39 D 560.6.12 (iv) Safety services – U P S

40 A 555.1.1 Transformers

41 D 560.8.1 (ii) Safety services – wiring systems

42 B 642.3 Inspection

43 C 534.4.8 Connection of SPD's (Fig 534.8)

44 A 642.3 Inspection

45 C Table 64 Minimum values of Insulation resistance

46 C App.6 Model forms

47 A 653.6 Periodic Inspection and testing

48 D 701.512.2 Bathrooms - External influences

49 B 701.512.2 Also 701.55 (xi) / Fig 701.2 Bathrooms – current-using equipment

50 C 701.410.3.5 (& 6) Bathrooms – protection against shock

51 C 702.522.21 Pools and basins – wiring systems

704.1.1

Construction sites – scope

705.411.1 (iii)

Agricultural – automatic disconnection

709.512.2.1.4 (iii)

Marinas – Impact (AG)

709.512.2

Marinas – external influences

721.43.1

Caravans – protection against overcurrent

740.55.9

Fairgrounds etc – dodgems

710.411.3.2.5

Medical locations – protection for safety

Appendix 4, Table 4B1

App. 4 – current carrying capacity, cables

Appendix 5, p.377

App.5 – external influences