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WorksheetsElectrical Regulations Quiz (Revised)
Total questions: 60
Worksheet time: 30mins
Which of the following Regulations are non-statutory?
BS 7671 Requirements for Electrical Installations (ET Regulations)
Electricity Safety, Quality and Continuity Regulations
Electricity at Work Regulations 1989
Health and Safety at Work etc. Act 1974
Which of the following is excluded from the scope of BS 7671?
Equipment of aircraft
Caravans
Commercial premises
Agricultural and horticultural premises
Which of the following is included in the scope of BS 7671?
Lightning protection systems
Equipment of motor vehicles
Those aspects of mines and quarries covered by Statutory Regulations
Photovoltaic systems
Which of the following would not necessarily need to be taken into consideration when additions or alterations are being made?
The rating of any existing equipment.
The condition of existing equipment.
The existing earthing and bonding arrangements.
The existing final circuits are protected by rewireable fuses.
Fault protection is defined as
Protection against electric shock under fault-free conditions
Protection against short circuit
Protection against electric shock under single fault conditions
Protection against overload
The definition 'An operation intended to remove, as quickly as possible, danger, which may have occurred unexpectedly' describes which of the following?
Switching off for mechanical maintenance
Emergency switching
Emergency stopping
Functional switching
Which of the following is not a characteristic that needs to be taken into account when choosing methods of protection for safety?
Maintainability
Continuity of service
External influences
Energy efficiency
In which of the following systems is the protective conductor separate from the neutral conductor inside the installation but combined on the supply side of the installation?
TN-C-S
IT
TN-C
TT
Which of the following items of information might need to be given to the distributor prior to receiving a connection?
Maximum demand
Nominal voltage
Type and rating of the overcurrent devices at the origin
External earth fault loop impedance
Which one of the following is not a reason given in BS 7671 for dividing circuits?
To avoid hazards and minimise inconvenience
To prevent the indirect energizing of a circuit intended to be isolated
To facilitate safe inspection, testing and maintenance
To enable functional switching
Which one of the following is not a characteristic to be considered under the heading compatibility?
DC feedback
Continuity of conductors
Starting currents
Transient overvoltages
Which of the following characteristics of supply cannot be determined by enquiry to the distributor?
The type and rating of the protective device at the origin of the installation
The nature of the current and frequency
The external earth fault loop impedance for a TT system
The nominal voltage and its characteristics
In an installation connected to a 400 V three-phase supply the value of Uo is?
400 V
230 V
240 V
415 V
Which of the following provides basic protection?
Protective bonding
RCDs
FELV
Insulation of live parts
Which of the following is not a basic protection provision?
Placing out of reach
Insulation of live parts
Protective bonding
Barriers or enclosures
For basic protection provision a readily accessible horizontal top surface requires a degree of protection of at least:
IP2X
IPX2
IP4X
IP44
The maximum disconnection time for a TN system with a nominal voltage of 400 V AC is which of the following:
0.2 s
0.4 s
1 s
5 s
The maximum earth fault loop impedance for 0.4 s disconnection time with Uo of 230 V for a BS 88-3 20 A fuse is which of the following:
1.0 Ω
1.93 Ω
1.7 Ω
2.0 Ω
Where a lid or an insulating enclosure can be opened without the use of a tool or key and conductive parts are accessible if the lid or door is open, an insulating barrier should be provided with a minimum degree of protection of which of the following?
IPXXB or IP2X
IPXXB or IP4X
IPXXD or IP2X
IPXXD or IP4X
The maximum permitted voltage of a separated circuit is:
60 V
12 V
23 V
500 V
Which of the following cannot be used as a source for a SELV or PELV system?
Autotransformer
Safety isolating transformer
An electrochemical source
Specific electronic devices
Which of the following provisions for providing basic protection can only be used in installations that are controlled or supervised by skilled persons?
Insulation of live parts
Enclosures
Obstacles
Barriers
The height in the overhead direction to comply with the requirements for placing out of reach is which of the following?
1.25 m
1.75 m
2.25 m
2.5 m
Consumer units used in domestic premises should either be made from, or enclosed in, a cabinet made from:
Heat resistant material
Flame retardant material
Low smoke, halogen free material
Non combustible material
Where overload protection is being provided by a BS 3036 fuse, the correction factor that may need to be applied when calculating the required current-carrying capacity of a conductor is which of the following?
0.707
0.725
0.755
1.45
Which of the following is the recommended standard for an AFFD device for a single-phase final circuit supplying socket-outlets not exceeding 32A?
BS EN 62423
BS EN 62305
BS EN 62606
BS EN 62395
What class of equipment is this symbol used to identify?
Class 0
Class I
Class II
Class III
An automatic supply classified as normal break would be available within which of the following?
0.15 s
0.5 s
5 s
15 s
Which of the following must not be used as an earth electrode?
An earth rod m
A public gas service pipe
Underground structural metalwork
Earth plates
What is the minimum size for a supplementary bonding conductor connecting two extraneous-conductive-parts where mechanical protection is provided?
2.5 mm²
4.0 mm²
6.0 mm²
10 mm²
Which of the following must be incorporated in, or placed in close proximity to, a single-phase water heater having immersed and uninsulated heating elements?
A double pole switch
A single pole switch
A non linked circuit breaker
A fuse
Control equipment incorporating means of protection against overload should be provided for every motor having a rating in excess of which if the following?
0.25 kW
0.37 kW
0.5 kW
3.7 kW
The common terminal of an autotransformer must be connected to which of the following?
The neutral conductor
An earth terminal
The line conductor
The protective conductor
The minimum cross-sectional-area of a screened multicore cable used in an auxiliary circuit is:
0.1 mm²
0.2 mm²
0.5 mm²
1.0 mm²
The value of the nominal voltage that should preferably not be exceeded for an auxiliary circuit connected to a DC supply is:
200 V
220 V
230v
250v
In TT and TN systems, except for E14 and E27 lampholders complying with BS EN 60238, the outer contact of every Edison screw lampholder shall be connected to the:
Neutral conductor
Line conductor
PEN conductor
Circuit protective conductor
The rating factor for a cable surrounded by thermal insulation for a length of 200 mm is which of the following?
0.5
0.63
0.725
0.78
The minimum cross-sectional area of a copper conductor for signalling and control circuits using bare conductors is which of the following?
1.0 mm²
2.5 mm²
4.0 mm²
6.0 mm²
Which Type of RCD should ONLY be used for fixed equipment, where it is known that no D.C. components are contained?
Type F
Type AC
Type B
Type A
For installations with a 230 V single-phase supply rated up to 100 A that are under the control of ordinary persons, the switchgear and controlgear should be?
A single pole switch
A switch in the neutral alone
A consumer unit complying with BS EN 61439-2
A consumer unit complying with BS EN 61439-3
BS 7671 requires that fire detection and fire alarm systems shall comply with the requirements of which series of standards?
BS 5266
BS EN 1838
BS 5839
BS 8519
For which of the following types of electrical installation work would the issue of a Minor Electrical Installation Works Certificate not be suitable?
A socket-outlet added to an existing ring final circuit
A socket-outlet added to an existing radial circuit
Replacement of a socket-outlet
Replacement of a consumer unit
The minimum value of insulation resistance for SELV and PELV circuits should be which of the following?
0.25 MΩ
0.5 MΩ
1.0 MΩ
2.0 MΩ
For initial testing, which of the following is part of the correct test sequence?
Polarity, earth fault loop impedance, insulation resistance, continuity of conductors
Earth fault loop impedance, polarity, continuity of conductors, insulation resistance
Insulation resistance, continuity of conductors, earth fault loop impedance, polarity
Continuity of conductors, insulation resistance, polarity, earth fault loop impedance
For a new installation which of the following persons completes the section on the Electrical Installation Certificate that recommends the time period until the next inspection and test?
The designer
The installer
The inspector
The owner
In a location containing a bath or shower, socket-outlets other than SELV socket-outlets are:
Permitted in zone 0
Permitted in zone 1
Permitted in zone 2
Not permitted in a location containing a bath or shower
The interior of the basin of a swimming pool would be described as which of the following?
Zone 0
Zone 1
Zone 2
Outside the zones
Which of the following is the preferred electrical system for portable hand lamps in confined or damp locations of a construction site?
SELV
110 V centre-point earthed reduced low voltage
110 V 3-phase, star point earthed
230 V, 1-phase
When used under normal conditions, electrical equipment in agricultural or horticultural premises should have a minimum degree of protection of which of the following?
IP42
IP44
IPX4
The minimum height for an overhead line in an area on a caravan site where vehicle movement is expected is which of the following?
3.5 m
5.0 m
6.0 m
8.0 m
Overload protection may be omitted to PV string and PV array cables when the continuous current-carrying capacity of the cable is how many times greater than or equal to the IscSTC of any location?
1.25
1.5
1.75
2
A flexible cable supplying a caravan with a rated supply current of 32 A requires a minimum cross-sectional area of which of the following?
16 mm²
6 mm²
4 mm²
2.5 mm²
Which of the following is not a function of PEI?
Supply
Distrubtion
Location
Consumption
The earthing arrangement needed for operating the PEI in island mode shall be connected to a suitable earth electrode complying with which Regulation?
542.1.1
542.1.2
542.2.1
542.2.2
Selectivity does not concern which of the following devices?
Overload protective device
Short-circuit protective device
Arc fault detection device
Residual current device
Which of the following is NOT a British Standard relating to plugs and socket-outlets?
BS EN 60309-2
BS 546
BS 1362
BS 1363
A 32A protective device to BS 88-3 fuse system C operates 5 seconds after a fault occurs. What was the approximate value of fault current that caused the device to operate?
32 A
125 A
140 A
200 A
The rating factor for the depth of cable (Cd) for a cable buried direct in the ground at a depth of 1 m is?
1.03
0.725
0.9
0.97
Which of the following utilisation categories applies to equipment that is suitable for immersion in liquids?
AA7
AD7
IPX7
IPX7
Model forms for certification and reporting are to be found in which of the following locations in BS 7671?
Appendix 6
Part 6
Appendix 4
Part 4
