Revision Flashcards
(115 cards)
1
Q
How many statutory and non-statutory regulations are there?
A
Five non-statutory and and 12 structured
2
Q
How many guidance notes are there in which one is important to us?
A
Eight guidance notes number three inspection and testing eighth edition being the most important
3
Q
What are five implications of not following regulation?
A
Prosecution finds prohibition notices improvement notices loss of reputation
4
Q
What is another name for a bar chart?
And what could they be used for?
A
Gangt
Measuring out the amount of time needed for a job or the amount of materials and men required
5
Q
What are the 8 types of building diagrams 
A
Architectural plans including as fit drawings, circuit diagrams, wiring diagrams, schematic diagrams and finally bar chart
6
Q
What are the four different types of switches?
A
One way, two way, intermediate and Pull
7
Q
What is the formula for scale length?
A
Actual length / scale
8
Q
What is an RCB stand for?
A
Residual circuit breaker
9
Q
What does RCBO mean?
A
Residual circuit breaker with overcurrent
10
Q
What does CB stand for?
A
Circuit breaker
11
Q
What are the three colours of three core wire?
A
Brown, black and grey
12
Q
What is the maximum length for flex core wire?
A
2 m
13
Q
Thermoplastic can be heated too
A
75°
14
Q
Thermosetting can be allowed to reach what temperature
A
90° C
15
Q
What is the maximum floor space an A1 ring circuit? It can take up
A
100 m²
16
Q
What is the maximum floor space and A2 radial circuit can take up?
A
75 m²
17
Q
What is the maximum for space and A3 radio? Circuit can take up.
A
50 m²
18
Q
Why is two plate coming back into fashion for wiring lights?
A
So it can connect to smart devices
19
Q
What are the components of a radiant heater?
A
Tungsten filaments in heat resistant quartz envelopes in front of a metal reflector
20
Q
What is the efficiency for a radiant heaters
A
86% the remainder is lost to conductive and convective heat
21
Q
How much each space heater be wired
A
On its own separate circuit going back to a protective device at the consumer unit
22
Q
What is underfloor heating most commonly associated with?
A
Hard flooring but it can be used for carpet if it is not too heavy
23
Q
What makes storage heaters economical?
A
Economy 7
24
Q
Hot water must be stored between
A
55 - 60 to prevent Legionella
25
Which regulation covers heaters?
554.3.3 of BS7671
26
How must a hot water tank be connected to the mains?
On its own individual circuit protected with a switch fuse connection unit and then attached with a heat resistant Flexi cable no longer than 2 m
27
How must an electric shower be connected to the mains
It must be on its own circuit going back to the consumer unit with a double pole switch(normally on a string) which is then followed through to the shower
28
What is the advantage of an open circuit in an alarm system?
It is easier to work on
29
What is the disadvantage of this circuit?
They need a monitoring circuit to make sure that they are not broken
Which is known as an end of line (EOL)
30
What is the advantage of a close circuit security system?
It is considered fail safe as if the circuit breaks it will trigger the alarm
31
What is the disadvantage of a close circuit system?
It’s hard to add additional sensors into and work on
32
What is the range of cable tray sizes
50mm to 1,000mm
33
What is the definition of an auxiliary circuit?
A circuit for transmission of signals intended for control detection supervision and measurement of the function of the static of a main current
34
What is the definition of an auxiliary circuit?
A circuit for transmission of signals intended for control detection supervision and measurement of the function of the static of a main current
35
What is the use of ladder rack
Industrial to deliver large numbers of sub-main cables
36
What are the two types of PVC cables?
Copper and aluminium for cables 16 mm² and above
37
What does PVC stand for?
Polyvinyl chloride
38
PVC cable releases hydrogen chloride fumes as well as producing hydrochloric acid on surfaces when it is burnt what similar alternative can we use to fix this problem?
Low smoke and fume LFSF cable
39
What is the difference between thermoplastic and thermosetting setting PVC cable? 
Thermoplastic has an maximum operating temperature of 70°c
And Thermosetting has a maximum operating temperature of 90° c
39
PVC insulated flat twin and earth and CPC wire comes in what size is and is used most commonly wear (6242y)
In domestic premises and most commonly in 1.5 and 2.5 variations the one you use in practical
40
PVC and PVC insulated shaved fixed cable comes frome what sizes and what variations (3992y and 3093y)
From 0.5 upwards and in two core and three court varieties 
41
What sizes does PVC single core come from? And what are the main use cases?
1mm and commercial domestic, industrial and agricultural 
42
Steel wide armour can be used as the cpc assuming what?
That’s the cross-sectional area corresponds directly with the copper
43
What are the typical sizes range for two core? Steel wire armour. As well as for single core.
Between 50 mm² and 1000 mm²
Between 1.5 mm² and 400mm 
44
What are the two types of fire resistant cable?
Material insulated copper clad (MICC)
And FP 200
45
What material is used to insulate MICC cable
Magnesium oxide powder along with a copper sheath
46
What is the size range for FP 200
Solid is 1 to 1.5 MM squared
And stranded is 4.5 MM 
47
What is the CWZ test referring to fire resistant cable?
C resistant to fire at 950°C for three hours
W resistant to fire and water at 650°C for 30 minutes
Z resistant to fire and mechanical shock at 950°C for 15 minutes 
48
If using steel conduit as earthing then the connections must be
Hand tight +1/4 turn 
49
What are the two types of steel conduit finishes?
Galvanised for outdoor use or we steam is present
And black enamel for dry situations
50
What are the typical sizes for steel conduit?
16 2025 and 32 diameters available in 3.75 m length
51
 what are the 4 types of PVC conduit 
Heavy gauge super high impact
Light gauge super high impact
Heavy gauge standard impact
And heavy gauge high temperature material
52
what are the dimensions that PVC conduit normally comes in?
16 2025 3238 and 50 mm diameter in a three meter length 
53
What are the nine types of trunking?
Steel tray accessory
Lighting trunking
Skirting board trunking
Dado trunking
Underfloor trunking
Busbar trunking suitable for three phase power
Rising main trunking
PVC trunking
PVC mini trunking 
54
What is the maximum voltage drop for a lighting circuit?
3% which on a 230 V supply works out to 6.9 V 
55
What is the maximum voltage drop for any of the circuit other than lighting
5% which on a 230 V supply works out to be 11.5 V
56
At what point in the substation to the neutral and earth come from?
The centre of the star point
57
The sequence of control for a large installation can be MOST simply shown
A wiring diagram
58
What type of protection does a cable sheath provide?
Against mechanical damage
59
From which regulation does this definition come from and refer to: all equipment which is intended to be worn, or held, to protect against risk to health and safety
PPE at work reguiations 1992
60
What does lb stand for
The design current of a circuit
61
What does in stand for? 
The rated design current protective device 
62
What does IZ stand for?
The current carrying capacity  of a cable
for a continuous surface underneath a particular install conditions 
63
What does it stand for? 
The tabulated current carrying capacity of a cable 
64
What are the three levels of distribution voltage?
33 KV
11 KV
And 400/230 v
65
What are the three transmission voltage 
400kv
275kv
132kv
66
A brief overview of what happened to the voltages in 19 33 ,49 and 65 respectively
In 1933 it operated at 132 KV then in 1949 it was upgraded to 275 kW then in 1965 it was upgraded to 400 kW 
67
What does TT stand for?
Terre terre
68
TN-S stand for
Terre neutral separate 
69
TN-C-S
Terre neutral combined separate
70
Which one of the following devices would be BEST suited to fixing 20 mm pvc conduit saddles to a concrete wall?
Wood screw and plastic wall plug
71
main purpose of equipotential bonding is to?
maintain adjacent metalwork at the same electrical potential
72
What are the indicators on a parallel made out of?
Glass ceramic and bake light
73
How many steps are there in power distribution and transmission?
Seven
74
What are the types of microgeneration?
Solar thermal ground source heat pump air source heat pump wood fuel heating photo voltaic micro wind micro Hydro micro combined heat and power 
75
What are the two methods of collecting waste water?
Rainwater harvesting and grey water reuse
76
What type of liquid is used in a ground source heat pump as well as solar thermal?
Antifreeze
77
What is the scheme that makes renewable heating affordable?
 renewable heating incentive
(RHL)
78
What certificate do you need to install micro wind in the UK?
Micro wind certificate scheme
79
What document does hydroelectricity need?
Planning permission and an abtraction license 
80
What is the path for current takes in a TT circuit called?
The general mass of earth (EG ground )
81
What is Ze in terms of ething
The typical maximum value of the Earth fault loop impedance, Ze
82
What is concentrate cable?
The inner core is the lin and the outer core is the neutral and earth 
83
What is the BS value for a semi enclosed fuse
Bs 3036
84
What are some advantages of mineraly insulated copper clad cable
fireproof
• moisture absorption
great mechanical strength
complicated termination process
waterproof
• non-ageing
small overall diameter
• high current carrying capacity earth continuity
• high
85
What are the advantages of Fp 200
Fire resistant good mechanical strength, waterproof easy to terminate and cheaper than mineral insulated copper clad cable
86
How must a shower, be wired
Off a double pole switch with a mechanically driven on off system
87
What switch a Hot water tank be wired in on
A fused switch
88
What is the maximum size for an A2 radio circuit?
75m²
89
What is the maximum size for an A3 radial  circuit?
50 m²
90
What is the maximum size of an A1 Ring circuit?
100 m²
91
What diameter are earth tails?
25mm
92
What are the typical use cases of a type B circuit breaker?
And the tripping percentage
Commercial, when there is no in rush and domestic
Trips between five and 3% of the rated current
93
Type C circuit breaker
Use case and tolerance
Tolerance is between five and 10 times the rated current and it is used for commercial applications when there are motors or fluorescent lamps 
94
Type D circuit breakers
Tolerance and use cases
Between 10 and 20 times the rated current these are industrial units where there is a large in rush motors x-rays so on so forth or somewhere where it cannot trip .
95
What is the exact wording on BS951 thing/bonding clamps?
 safety electrical connection do not remove 
96
Cables in wooden joints must be beat least at what distance from the top or the bottom 
50 mm
97
What is meant by the term zone of protection?
The area covered by the earthing system
98
In a wet room, the bath is located in what zone
Zone 0
99
If an inspector from the HSC determines that there is a risk of personal injury, what will they use?
A prohibition notice
100
What is the name for the component that links the main earthing terminal to the terminal of an insulation to the means of earthing?
Earthing conductor
101
The two key pieces of information required when completing a day worksheet are
The amount of extra time and amount of material that has been used
102
When installing conjure a longer wall, a distant saddle must be used for what?
In order to account for condensation
103
All 230 V circuits in bathroom must be protected by what?
An RcD
104
How can we protect against earth leakage?
A fuse a circuit breaker, a residual current operating breaker with integrated current protection (RcBo) or residual current device RCD
105
What is the maximum that the grid supply is allowed to fluctuate by?
+10% and -6%
106
What is the meaning of ZS?
The total fault loop impedance  
107
What is R2 plus R1?
The combined resistance of the customers line conductor and the customers CPC 
108
A type of emergency light fixture that only illuminates when the power fails is called:
Non-maintained
109
Area Distribution Boards in large factories and commercial premises should normally be positioned
near to the load centres
110
What size should the main earthing wire  and MAIN BONDING be
MAIN BONDING 10
MAIN EARTHING 16
111
35. 230V is represented by which of the following colour outlets
Blue
112
What is the BS value for flexible cables
. BS EN 50525-2-11.
113
What is the BS number for twin and Earth?
Be 6004
114
What is the BS racing for a semi enclosed reliable fuse?
BS3036
