2382-15 TEST QUESTIONS PAPER 1
1. BS7671 applies to:
a) aircraft
b) photovoltaic supplies
c) distributors equipment
d) electrical equipment of machines
2. BS 7671 does not apply to:
a) railway traction equipment
b) photovoltaic systems
c) marinas
d) fairgrounds
3. Protection against electric shock under single fault conditions is:
a) basic protection
b) fault protection
c) additional protection
d) supplementary protection
4. Which of the following would not be defined as a live part?
a) neutral conductor
b) line conductor
c) neutral bar
d) PEN conductor
5. Every installation should be divided into circuits as necessary to avoid:
a) fuse discrimination problems
b) hazards to minimise inconvenience in the event of a fault
c) unauthorised interference with safety supplies
d) wiring impracticability
6. The protective measure automatic disconnection of supply:
a) is only permitted if the installation is under effective supervision
b) is a method of reducing thermal effects
c) is a combination of basic and fault protection
d) is a combination of under and over voltage protection
7. The maximum disconnection time for a 16A final circuit having Uo
230V ac on a TN system is:
a) 5 s
b) 0.2 s
c) 0.4 s
d) 0.1 s
8. Where there is a danger of fire due to the nature of stored materials a
motor with star delta starting must be protected against excessive
temperature:
a) in star
b) in delta
c) in both star and delta
d) only if 10 kw or more
9. In the event of failure of the provision for basic protection, additional
protection may be provided by:
a) supplementary bonding
b) use of a time delay 100mA RCD
c) use of a RCD with ln not exceeding 30mA
d) electrical separation
10. Which of the following is not a method of fault protection:
a) placing out of reach
b) use of class II equipment
c) earthing and bonding
d) electrical separation
11. For a TT system where disconnection in the case of earth fault is
achieved by RCD, the maximum disconnection time for a general
socket in a domestic kitchen is:
a) 0.1 s
b) 0.2 s
c) 0.4 s
d) 5 s
12. In the event of an earth fault on the HV side of a substation, the LV
installation may be affected by:
a) power frequency fault currents
b) power frequency stress voltages
c) power current stresses
d) power plus current stresses
13. Connection of extraneous conductive parts to the MET of an
installation forms part of the requirements for:
a) SELV
b) enclosures
c) basic protection
d) fault protection
14. Thermoplastic PVC T&E buried less than 50mm must be protected by:
a) MCB
b) cpc the same size as the P & N
c) 30mA RCD
d) disconnection time of 0.4 s
15. RCD installed for protection against fire must have a rating not
exceeding:
a) 30 mA
b) 100 mA
c) 300 mA
d) 500 mA
16. Which of the following may not be used as an earth electrode:
a) underground structural steel work
b) welded metal reinforcement
c) water utility supply pipes
d) earth plates
17. Socket outlets with a rating not exceeding 20A for general use by
ordinary persons should be:
a) connected as a ring circuit
b) connected as a radial circuit
c) protected by a 30mA RCD
d) protected by a 20A CB
18. Lighting installations in bus shelters must be protected by:
a) CCTV
b) double pole circuit breakers
c) graffiti proof covers
d) 30mA RCD
19. Busbar trunking systems must comply with:
a) BSEN 60439-2
b) BSEN 61534-1
c) BSEN 60898-7
d) BSEN 60309-2
20. The minimum acceptable value for insulation resistance in 230v supply
is:
a) 0.25 MF
b) 0.5 MF
c) 1.0 MF
d) 5.0 MF
21. Insulation resistance measured between line and neutral of a 230v
domestic installation should not be less than:
a) 0.25 MF
b) 0.5 MF
c) 0.75 MF
d) 1.0 MF
22. A PV generator and array junction box must have a warning label
indicating that:
a) high voltage is present
b) parts inside may still be live following isolation
c) PV array must be cleaned regularly
d) PV arrays are fragile
23. All circuits in a bathroom must have:
a) protection by a 30mA RCD
b) disconnection time of 5 s
c) supplementary bonding
d) protected by a CB
24. Electrical cables in Zone 1 of a fountain shall be protected against
mechanical impact to:
a) AG1
b) AG2
c) AH2
d) AH3
25. On agricultural premises an RCD may be used for protection against
fire providing that the rating of the RCD does not exceed:
a) 30 mA
b) 150 mA
c) 300 mA
d) 500 mA
26. Any luminaries of lighting chains used at a circus must be firmly fixed
when at a height less than:
a) 1 m
b) 1.5 m
c) 2 m
d) 2.5 m
27. In a bathroom the protective measure of obstacles is:
a) allowed in all zones
b) allowed in zones 1 & 2
c) allowed in zone 2 only
d) not allowed
28. Where a TN system of earthing is used in a marina the final circuits for
the supply of a pleasure craft must not include:
a) any earth conductors
b) a PEN conductor
c) any RCDs
d) protective devices
29. For a 100 mA non-delay RCD to BSEN 61008 the residual test currents
and maximum permitted disconnection times are:
a) 100 mA 300ms 500 mA 40ms
b) 100 mA 130ms 1500 mA 150ms
c) 100 mA 0ms 100 mA 40ms
d) 100 mA 400ms 500 mA 50ms
30. Flat T & E cable clipped direct to a ceiling joist where thermal insulation
exceeds 100mm thickness is installation method:
a) 101
b) 100
c) 3
d) 20
Answers:
1 B 110.1 (xii)
2 A 110.2 (ii)
3 B Definitions
4 D Definitions
5 B 314.1 (i)
6 C 411.1 (i) (ii)
7 C Table 41
8 C 422.3.7
9 C 415.1.1
10 A 417.1
11 B Table 41.1
12 B 422.2 (ii)
13 D 411.3.1.2
14 C 522.6.7
15 C 532.1 (i)
16 C 542.2.1
17 C 411.3.3 (i) & 415.1
18 D 559.10.3.2 & 415.1
19 A 521.4
20 C Table 61
21 D Table 61
22 B 712.537.2.2.5.1
23 A 701.411.3.3
24 B 702.55.3
25 C 705.411.1 (iii)
26 D 740.55.1.1
27 D 701.410.3.5
28 B 709.411.4
29 A Table 3A Page 243
30 A Table 4A2 Page 265
