First Assessment Flashcards

1
Q

What is the name of the earthing system that combines earth and neutral and then separates at the consumers intake?

A

TN-C-S

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2
Q

Where a three phase supply is provided for commercial or industrial properties, what is the voltage most likely to be?

A

400V

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3
Q

What is an exposed conductive part?

A

Trunking

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4
Q

What does the abbreviation ADS stand for?

A

Automatic Disconnection of Supply

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5
Q

Which of the following indicates how a circuit operates?

A

Circuit diagram

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6
Q

What would you use to determine how a piece of equipment works

A

User Guide

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7
Q

You need to install cable in a high temperature environment, MICC is specified, however the customer asks for a cheaper alternative. what would this be?

A

FP

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8
Q

For a new build domestic property, what would the main service fuse be rated at

A

100A

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9
Q

The term strapper cable is associated with?

A

Two way lighting

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10
Q

If cables are buried in a wall to more than 50mm in depth what further action should be taken?

A

None

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11
Q

When a TNS earthing system is used what element would carry a fault current

A

Metal Sheath

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12
Q

A domestic heater is rated at 4.5kW what would be the design current?

A

4.5kW = 4500W

4500 Divided by 230V = 19.56A

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13
Q

The cable that goes from the L1 side of a one way switch to your light fitting is known as:

A

Switch wire

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14
Q

What are the old Line conductor colors?

A

Red, Yellow, Blue

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15
Q

What is material is the compressed insulation in an MICC cable?

A

Magnesium Oxide

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16
Q

Using the singles method the switch feed from the DB goes to what terminal?

A

Common of the switch

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17
Q

Name the two types of fire alarm systems

A

Addressable & Conventional

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18
Q

The abbreviation 3L1.5 when using MICC would refer to

A

3 core light duty 1.5mm

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19
Q

Main protective bonding on an incoming water supply should be positioned at:

A

600mm from the intake position

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20
Q

Zs is = to

A

Ze +(R1+R2)

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21
Q

Failure to refer to the Wiring Regulations could result in which of the following:

A

Non-compliance with regard to the building regulations
+
non-compliance with regard to health & Safety

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22
Q

Which of the following is regarded as non-statutory

A

BS 7671

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23
Q

Which of the following came about through an act of parliament?

A

Health & Safety Act 1974

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24
Q

A double socket outlet is shown with a scale dimension of 15 mm. Using a scale of 1:100, calculate the actual dimension of the socket.

A

15mm x 100 = 1500mm / 1.5m

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25
Q

Which of the following indicates how a circuit operates

A

Circuit diagram

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26
Q

Which of the following would be beneficial in order to determine how a piece of equipment works?

A

User Guide

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27
Q

Which of the following would you refer to if you were installing unfamiliar equipment

A

Manufacturers instructions

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28
Q

Familiarizing yourself with which document means that you are following a code of practice?

A

BS 7671

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29
Q

An appropriate wiring method for a domestic installation would be:

A

PVC/SWA cables

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30
Q

An appropriate wiring method for a domestic installation would be:

A

PVC flat profile cable

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31
Q

A conductor used in the transfer of data is:

A

Fibre-optic

32
Q

In high temperature environments, a cheaper alternative to mineral insulated cable would be?

A

FP

33
Q

Which of the following is the most appropriate containment system fora low current application such as commercial lighting?

A

Power track.

34
Q

Which of the following would be most appropriate regarding the final connection supplying a motor circuit

A

Flexible conduit

35
Q

Which type of cable is most appropriate regarding the final connection to an immersion heater?

A

Flexible heat resistant cable

36
Q

Which of the following is most appropriate containment system for heavy current applications?

A

Bus-bar systems

37
Q

A steel conduit installation would be suitable for the following type of installation (2marks)

A

Commercial + Industrial

38
Q

A steel trunking installation would be suitable for the following type of installation?

A

Commercial + Industrial

39
Q

For a modern domestic property, the main service fuse should be rated at

A

100 A

40
Q

For a modern domestic property, the meter tails should be

A

25mm

41
Q

For a modern domestic property, which of the following is correct

A

Main earth conductor 16mm Main protective bonding conductor 10mm

42
Q

Main protective bonding conductors provide bonding for what?

A

Extraneous conductive parts

43
Q

A TN-C-S earthing system is also known as what?

A

PME SYSTEM

44
Q

The term strapper cable is associated with what?

A

Two way-lighting

45
Q

The cable that leaves the one-way switch to feed the light fitting is called what?

A

Switch wire

46
Q

What is the normal size and rating of a lighting cable and protective device?

A

1.5 mm and 6A A

47
Q

If cables are buried in a wall to more than 50mm in depth, what additional action should be taken

A

None

48
Q

The maximum floor area an A1 circuit can serve is

A

100m²

49
Q

An A2 circuit is known as what?

A

A radial Circuit 30 A or 32 A wired in 4.0mm²

50
Q

Each power socket within a ring circuit can have

A

one unfused spur installed with a 2.5mm cable

51
Q

In accordance with the wiring regulations, all power sockets rated at 20A or less must be given additional protection this means that;

A

a 30mA RCD must be in place

52
Q

A kitchen is normally fed by it’s own ring main because:

A

it normally houses a lot of current drawing equipment

53
Q

Which of the following applies to polarity

A

protective devices are installed in sequence highest to lowest from the main switch

54
Q

Within a consumer unit, the highest rated circuit breaker should be positioned

A

Next to the main switch

55
Q

When wiring up a spilt-board consumer unit, the downstairs lights should be positioned alongside

A

The upstairs sockets

56
Q

Metal conduit and trunking elements of an installation are

A

Exposed conductive parts

57
Q

The gas, water and central heating pipes of the building not forming part of the electrical installation are called:

A

Extraneous conductive parts

58
Q

The act of connecting the exposed conductive parts of the installation to the main earthing terminal of the installation is called:

A

Earthing

59
Q

According to the on-site guide all final circuits not exceeding 32A in a building supplied with a 230V TN earthing supply, shall have a maximum disconnection time not exceeding

A

0.4 seconds

60
Q

Which of these symbols represents the total earth fault loop impedance:

A

Zs

61
Q

A TNS earthing system makes use of which element to carry fault current?

A

Metal sheath

62
Q

The purpose of earthing is to ensure

A

resistance path is low, fault current is high and disconnection is quick

63
Q

Which of the following is an extraneous conductive part

A

Metal gas pipe

64
Q

An industrial welder has been installed in a domestic garage but cannot operate because the type B circuit breaker protecting the circuit operates instantly. To correct this the circuit breaker needs:

A

to be replaced with a type D

65
Q

The weakest link in the circuit designed to melt when too much over-current flows is one definition of

A

a fuse

66
Q

The main service fuse needs to be able to withstand small supply surges and therefore will be which of the following types

A

BS88-2

67
Q

Which of the following devices incorporates additional protection

A

RCBO

68
Q

Which earthing system is not recommended for a petrol station?

A

TN-C-S

69
Q

Calculate the total current demand for a domestic lighting circuit if it contains 20x100W filaments and the factor for diversity is 66%

A

20 x 100 = 2000
drop the voltage: 2000/230 = 8.69
8.69 x 0.66 = 5.7A

70
Q

What % voltage drop is associated with power circuits

A

5%

71
Q

A cooker can be fitted with a smaller cable after applying

A

Diversity

72
Q

Refer to table F6 in the on-site guide and determine the maximum current associated with a 2.5mm cable which has been clipped direct.

A

27A

73
Q

A domestic instantaneous heater is rated at 3kW. Given that the voltage is 230V work out the design current.

A

3kW = 3000w

3000w / 230 = 13.04 A

74
Q

Refer to table F6 of the on-site guide and determine the voltage drop factor for a 4mm cable:

A

11 mV/A/m

75
Q

Which of the following is the correction factor regarding ambient temperature

A

Ca

76
Q

Which of the following is the symbol regarding current carrying capacity of the a cable?

A

Iz

77
Q

Spike driven into the ground

A

TT System