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Worksheets18th Edition Section 3
Total questions: 14
Worksheet time: 42mins
28. The maximum temperature at the conductors of thermoplastic insulated cables is:
90°C
70°C
105°C
60°C
29. What is the minimum level of IP protection provided by a trunking system for the protection of non-sheathed circuit cables?
IP2X
IP3X
IP4X
IP5X
30. A warning notice of maximum voltage present must be fixed to
Where a nominal voltage of 230 V to earth exists where it would not normally be expected
400V between line conductors
230V single phase in a domestic property
Single-phase motors above 10 kW
31. A legible diagram, chart of table relating to an installation must be provided to indicate
The location of all fixed equipment for testing purposes
Any circuit of equipment vulnerable to a typical test
The location of all portable equipment for testing purposes
That the original installation design has not changed
32. A heater takes a design current of 32 A over a run of 15 metres using 4 mm2 two-core cable having a rated voltage drop of 11 mV/A/m. The total actual drop will be
9.6 V
6.0 V
5.28 V
2.5 V
33. What is the maximum preferable DC power supply system voltage for an auxiliary control circuit?
50 V
110 V
220 V
277 V
34. A cable joint must be accessible if it is
Designed to be buried in the ground
Made by welding, soldering or brazing
Compound-filled or encapsulated joint
Enclosed in a screw terminal junction box
35. Which one of the following can be used as a device for emergency switching?
Semiconductor devices to BS EN 50428
20 A plug and socket-outlet to BS EN 60309
Switched fused connection unit to BS EN 1363-4
Unswitched fused connection unit to BS EN 1363-4
36. Where RCDs are operated by ordinary persons which type of device should not be used
BS EN 61008
BS EN 61009
BS EN 62423
BS EN 60947-2
37. Providing necessary precautions are taken, a metallic pipe may be used as an earth electrode if it
Carries flammable gases
Is owned by a water utility company
Is a private water supply pipe
Is insulated
38. In order to calculate the minimum cross-sectional area of a protective conductor, the following information is available - Fault Current = 400 A, Operating time of protective device = 0.15s, Constant, k, for protective conductor material = 134. What size should the protective conductor be?
1.5 mm2
2.5 mm2
4.0 mm2
6.0 mm2
39. Which one of the following is not classified as an outdoor lighting installation?
An illuminated road sign
The illumination for an outdoor monument
The lighting arrangement for an advertising panel
A luminaire on an outside wall of a building, internally fed
40. An item of equipment is to be installed and, although it complies with foreign national standards, it does not carry an applicable British Standard. What standards should the foreign standards be based on in order to consider compliance with relevant standards?
IEC
NIC
EIC
BSI
41. A source for a safety service should be installed as
Fixed equipment
Portable equipment
Hand held equipment
Class I equipment
