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Eleccy > 204: Electrical Technology > Flashcards

204: Electrical Technology Flashcards

1
Q

Why is alternating current used for transmission and distribution of electricity?

A

It is easier to step-up/step-down

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2
Q

Why is voltage stepped-up from the generation to the transmission stage?

A

To reduce voltage drop

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3
Q

What are the 3 transmission voltages?

A

132kV. 275kV. 400kV

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4
Q

What is a DNO?

A

Distribution Network Operator

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5
Q

How many volts are supplied to heavy industry properties?

A

11kV (11,000)

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6
Q

How many volts are supplied to garages?

A

230v/400v

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7
Q

How many volts are supplied to domestic properties?

A

230v

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8
Q

What type of current is in a battery?

A

Direct current

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9
Q

What is earth leakage current?

A

When the earth becomes live

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10
Q

What are the 4 components of a single phase incoming supply up to 100A?

A

Distributors cut out. Electricity meter. Meter tail. Isolator switch

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11
Q

What is over current?

A

Too much current

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12
Q

What is an unfused spur?

A

A socket wired from another socket

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13
Q

What is the maximum socket height?

A

1.2 meters

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14
Q

What is the minimum socket height?

A

450 millimeters

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15
Q

What are 3 examples of fault protection?

A

MCB. RCBO. RCD

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16
Q

What is earthing?

A

Conductors that provide the path of least resistance

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17
Q

What do letters represent in an IP code?

A

Access by persons to electrical or mechanical parts

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18
Q

What does IP stand for?

A

Ingress protection

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19
Q

What is an example of insulating live parts?

A

A plug top

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20
Q

What do obstacles prevent?

A

Accidental contact with live parts

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21
Q

What is an example of placing out of reach?

A

Placing something on the ceiling

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22
Q

What is an example of an enclosure?

A

The cover of a consumer unit

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23
Q

What is an example of a barrier?

A

A line bus bar

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24
Q

What is fault protection?

A

Protection against a fault in a circuit

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25
Q

What is basic protection?

A

Protection against direct contact

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26
Q

What are the 2 conditions for a significant electric shock?

A

Contact with 2 conductors with a voltage potential over 50ac

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27
Q

Who is responsible for overseeing training for the mobile access tower industry?

A

PASMA

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28
Q

What 3 names are the earth wire also known as?

A

Circuit protective conductor. CPC. R2

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29
Q

What are the 5 forms of electricity?

A

Chemical. Thermal. Electrical. Atomic. Mechanical

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30
Q

What is the BS number for ‘Safety electrical connection, do not remove’?

A

BS 951

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31
Q

What does Z stand for?

A

Impedance/ Total resistance

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32
Q

What does TNCS stand for?

A

Terra. Neutral. Combined. Seperate

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33
Q

Where would a TT system be found?

A

Rural areas

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34
Q

What does a TT system rely on for an earth supply?

A

An earth electrode in the ground

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35
Q

What does a TNS system rely on for an earth supply?

A

A lead-lined outer sheath

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36
Q

What is the BS number for wiring regulations?

A

BS 7671

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37
Q

What is the maximum touch voltage?

A

50 Volts

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38
Q

What does Zs mean?

A

Fault current

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39
Q

What number is nominal voltage?

A

230V

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40
Q

What number is nominal voltage in an RCD?

A

50V

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41
Q

What symbol is used for nominal voltage?

A

Uo

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42
Q

What does PME stand for in TN-CS?

A

Protective multiple earths

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43
Q

What does PME stand for in TT?

A

Protective mass of earth

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44
Q

What does PEN stand for?

A

Protective earth and neutral

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45
Q

What is the term for basic protection and fault protection?

A

Protective measure

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46
Q

What is a main earthing terminal?

A

Earth bar

47
Q

A cable of 1.5mm would have a CPC measuring what?

A

1.0mm

48
Q

A cable of 1.0mm would have a CPC measuring what?

A

1.0mm

49
Q

A cable of 4.0mm would have a CPC measuring what?

A

1.5mm

50
Q

A cable of 2.5mm would have a CPC measuring what?

A

1.5mm

51
Q

A cable of 10.0mm would have a CPC measuring what?

A

4.0mm

52
Q

A cable of 6.0mm would have a CPC measuring what?

A

2.5mm

53
Q

What does CU stand for?

A

Cooker unit

54
Q

What does CCU stand for?

A

Consumer unit

55
Q

What does CCC stand for?

A

Current carrying capacity

56
Q

What 2 ways can heaters transfer heat?

A

Convection. Radiation

57
Q

What does single pole turn off?

A

The line conductor

58
Q

What does double pole turn off?

A

Line + neutral conductors

59
Q

What does a fuse protect?

A

Cable

60
Q

What 2 things do a fuse protect against?

A

Overload, Short circiuit

61
Q

What does an MCB protect?

A

Cable

62
Q

What 2 things do an MCB protect against?

A

Overload, short circuit

63
Q

What does an RCD protect?

A

Life

64
Q

What does an RCD protect against?

A

Earth fault

65
Q

What does an RCBO protect?

A

Cable

66
Q

What 3 things to RCBO’S protect against?

A

Overload, Earth fault, Fault current

67
Q

What color is a 5 amp fuse?

A

White

68
Q

What color is a 15 amp fuse?

A

Blue

69
Q

What color is a 20 amp fuse?

A

Yellow

70
Q

What color is a 30 amp fuse?

A

Red

71
Q

What color is a 45 amp fuse?

A

Green

72
Q

What is Ib?

A

Design current

73
Q

What is In?

A

Rated current

74
Q

What is Iz?

A

Current carrying capacity of a cable

75
Q

What is IT?

A

Tabulated current carrying capacity of a cable

76
Q

What is Ca?

A

Ambient or surrounding temperature

77
Q

What is Cf?

A

Semi-enclosed fuse

78
Q

What is Cg?

A

Grouping factor

79
Q

What is Ci?

A

Insulation

80
Q

How do you calculate earth fault loop impedance in an RCD?

A

50 ÷ ampage

81
Q

What does ‘supplementary’ mean?

A

In addition to

82
Q

What is EMS?

A

Electrical Monitoring System

83
Q

What tool is used to determine if an accessory is horizontally level?

A

Spirit level

84
Q

What is the insulator for an 11kV overhead line made from?

A

Glass

85
Q

What does PAT mean?

A

Portable appliance test

86
Q

What happens to the length resistance if a conductor’s diameter is doubled?

A

It is halved

87
Q

What is the constant for RMS values?

A

0.707 AC

88
Q

What is RMS?

A

Root Mean Squared

89
Q

Why should contact between copper and aluminum conductors be avoided?

A

There is a risk of electrolytic action

90
Q

What is electrolytic action?

A

One metal corroding the other

91
Q

How can small hand tools be maintained?

A

Covering with a light coat of oil

92
Q

What does main equipotential bonding provide an earth to?

A

Exposed parts to extraneous parts

93
Q

What is an example of main equipotential bonding?

A

CPC from consumer unit to a copper water pipe

94
Q

What does supplementary bonding provide an earth to?

A

Extraneous parts to extraneous parts

95
Q

What is an example of supplementary bonding?

A

A CPC from a copper water pipe to another copper water pipe

96
Q

What does ADS stand for?

A

Automatic disconnection to supply

97
Q

Where should a bonding connection be provided in a property?

A

Within 60cm of the gas meter before any connections

98
Q

In a TN-S system, how is the installation connected to the general mass of earth?

A

With a PEN conductor

99
Q

What is the purpose of protective electrical bonding?

A

To keep the potential difference at 0

100
Q

What is an example of an extraneous conductive part?

A

Exposed copper pipework

101
Q

What is the formula for earth fault loop impedance?

A

(R1+R2) + Ze

102
Q

What is isolation?

A

Removing all sources of electrical energy

103
Q

What is an example of an exposed conductive part?

A

A metal switch plate

104
Q

What is the BS EN number of an MCB?

A

60898

105
Q

What device wouldn’t protect against overcurrent?

A

An RCD

106
Q

What is BS 88?

A

A HBC fuse

107
Q

What device protects against overcurrent?

A

A Circuit breaker

108
Q

What is the document showing the location of electrical equipment in an installation?

A

A Drawing

109
Q

Which diagram type does not show individual conductors or cables but shows the sequence of equipment?

A

Block

110
Q

Additional cable supports should be provided in trunking where?

A

There are long vertical runs

111
Q

Which earthing system has separate neutral and earth?

A

TNS

112
Q

What are 3 features of an extraneous part?

A

Conductive
Not part of the electrical installation
Usually connected to the ground

113
Q

What are 3 features of an exposed conductive part?

A

Conductive
Part of the electrical installation
Not normally live

Eleccy (9 decks)

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