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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
What is basic protection?
Protection against direct contact
26
What are the 2 conditions for a significant electric shock?
Contact with 2 conductors with a voltage potential over 50ac
27
Who is responsible for overseeing training for the mobile access tower industry?
PASMA
28
What 3 names are the earth wire also known as?
Circuit protective conductor. CPC. R2
29
What are the 5 forms of electricity?
Chemical. Thermal. Electrical. Atomic. Mechanical
30
What is the BS number for 'Safety electrical connection, do not remove'?
BS 951
31
What does Z stand for?
Impedance/ Total resistance
32
What does TNCS stand for?
Terra. Neutral. Combined. Seperate
33
Where would a TT system be found?
Rural areas
34
What does a TT system rely on for an earth supply?
An earth electrode in the ground
35
What does a TNS system rely on for an earth supply?
A lead-lined outer sheath
36
What is the BS number for wiring regulations?
BS 7671
37
What is the maximum touch voltage?
50 Volts
38
What does Zs mean?
Fault current
39
What number is nominal voltage?
230V
40
What number is nominal voltage in an RCD?
50V
41
What symbol is used for nominal voltage?
Uo
42
What does PME stand for in TN-CS?
Protective multiple earths
43
What does PME stand for in TT?
Protective mass of earth
44
What does PEN stand for?
Protective earth and neutral
45
What is the term for basic protection and fault protection?
Protective measure
46
What is a main earthing terminal?
Earth bar
47
A cable of 1.5mm would have a CPC measuring what?
1.0mm
48
A cable of 1.0mm would have a CPC measuring what?
1.0mm
49
A cable of 4.0mm would have a CPC measuring what?
1.5mm
50
A cable of 2.5mm would have a CPC measuring what?
1.5mm
51
A cable of 10.0mm would have a CPC measuring what?
4.0mm
52
A cable of 6.0mm would have a CPC measuring what?
2.5mm
53
What does CU stand for?
Cooker unit
54
What does CCU stand for?
Consumer unit
55
What does CCC stand for?
Current carrying capacity
56
What 2 ways can heaters transfer heat?
Convection. Radiation
57
What does single pole turn off?
The line conductor
58
What does double pole turn off?
Line + neutral conductors
59
What does a fuse protect?
Cable
60
What 2 things do a fuse protect against?
Overload, Short circiuit
61
What does an MCB protect?
Cable
62
What 2 things do an MCB protect against?
Overload, short circuit
63
What does an RCD protect?
Life
64
What does an RCD protect against?
Earth fault
65
What does an RCBO protect?
Cable
66
What 3 things to RCBO'S protect against?
Overload, Earth fault, Fault current
67
What color is a 5 amp fuse?
White
68
What color is a 15 amp fuse?
Blue
69
What color is a 20 amp fuse?
Yellow
70
What color is a 30 amp fuse?
Red
71
What color is a 45 amp fuse?
Green
72
What is Ib?
Design current
73
What is In?
Rated current
74
What is Iz?
Current carrying capacity of a cable
75
What is IT?
Tabulated current carrying capacity of a cable
76
What is Ca?
Ambient or surrounding temperature
77
What is Cf?
Semi-enclosed fuse
78
What is Cg?
Grouping factor
79
What is Ci?
Insulation
80
How do you calculate earth fault loop impedance in an RCD?
50 ÷ ampage
81
What does 'supplementary' mean?
In addition to
82
What is EMS?
Electrical Monitoring System
83
What tool is used to determine if an accessory is horizontally level?
Spirit level
84
What is the insulator for an 11kV overhead line made from?
Glass
85
What does PAT mean?
Portable appliance test
86
What happens to the length resistance if a conductor's diameter is doubled?
It is halved
87
What is the constant for RMS values?
0.707 AC
88
What is RMS?
Root Mean Squared
89
Why should contact between copper and aluminum conductors be avoided?
There is a risk of electrolytic action
90
What is electrolytic action?
One metal corroding the other
91
How can small hand tools be maintained?
Covering with a light coat of oil
92
What does main equipotential bonding provide an earth to?
Exposed parts to extraneous parts
93
What is an example of main equipotential bonding?
CPC from consumer unit to a copper water pipe
94
What does supplementary bonding provide an earth to?
Extraneous parts to extraneous parts
95
What is an example of supplementary bonding?
A CPC from a copper water pipe to another copper water pipe
96
What does ADS stand for?
Automatic disconnection to supply
97
Where should a bonding connection be provided in a property?
Within 60cm of the gas meter before any connections
98
In a TN-S system, how is the installation connected to the general mass of earth?
With a PEN conductor
99
What is the purpose of protective electrical bonding?
To keep the potential difference at 0
100
What is an example of an extraneous conductive part?
Exposed copper pipework
101
What is the formula for earth fault loop impedance?
(R1+R2) + Ze
102
What is isolation?
Removing all sources of electrical energy
103
What is an example of an exposed conductive part?
A metal switch plate
104
What is the BS EN number of an MCB?
60898
105
What device wouldn't protect against overcurrent?
An RCD
106
What is BS 88?
A HBC fuse
107
What device protects against overcurrent?
A Circuit breaker
108
What is the document showing the location of electrical equipment in an installation?
A Drawing
109
Which diagram type does not show individual conductors or cables but shows the sequence of equipment?
Block
110
Additional cable supports should be provided in trunking where?
There are long vertical runs
111
Which earthing system has separate neutral and earth?
TNS
112
What are 3 features of an extraneous part?
Conductive Not part of the electrical installation Usually connected to the ground
113
What are 3 features of an exposed conductive part?
Conductive Part of the electrical installation Not normally live

Eleccy (9 decks)

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