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


  1. zone 2

  2. zone 1

  3. zone O

  4. 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

  1. not be used

  2. not be earthed

  3. be connected to the supplementary bonding

  4. have reinforced insulation.



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

  1. cloakrooms

  2. offices

  3. construction and demolition site installations

  4. 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

  1. 500mA

  2. 300 mA

  3. 100mA

  4. 30mA.


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

  1. IPX4

  2. IPX8

  3. IP55

  4. IK08.



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

  1. AD

  2. AE

  3. AF

  4. AP.

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

  1. all live conductors in that circuit

  2. the line conductors only

  3. line, neutral and protective conductors

  4. the caravan and site supply system.



57 Electric dodgems shall only be operated at voltages not exceeding

  1. 120Va.c.or 50Vd.c.

  2. 50 V a.c. or 120 V d.c.

  3. 110 V a.c. reduced low voltage

  4. 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

  1. 60V AC

  2. 50V AC

  3. 50V DC

  4. 25V AC



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

  1. 0.91

  2. 0.94

  3. 0.96

  4. 1.02



60 External influences coded BE are classified as

  1. nature of processed or stored materials

  2.  conditions of evacuation in an emergency

  3. movement of air

  4. 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




Construction sites – scope



705.411.1 (iii)

Agricultural – automatic disconnection



709.512.2.1.4 (iii)

Marinas – Impact (AG)




Marinas – external influences




Caravans – protection against overcurrent




Fairgrounds etc – dodgems




Medical locations – protection for safety



Appendix 4, Table 4B1

App. 4 – current carrying capacity, cables



Appendix 5, p.377

App.5 – external influences

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