17th Edition BS 7671 Quiz
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BS 7671, it's require for electrical installations, Take this quiz and learn more about it!
- 1.Requirements are included in BS 7671 for electrical installations of
- A.
Lift installations
- B.
Mobile offshore electrical systems
- C.
Distributor's networks
- D.
Locations containing a bath or shower
- 2.
- A.
Cabins containing sauna heaters
- B.
Fountains
- C.
Highway power supplies
- D.
Lightning protection
- 3.Which of the following is not included in BS 7671?
- A.
Demolition site installations
- B.
Electric fences
- C.
Medical locations
- D.
Motor caravans
- 4.Which of the following documents is non-statutory?
- A.
Electricity Safety, Quality and Continuity Regulations
- B.
Electricity at Work Regulations
- C.
The Building Regulations
- D.
Requirements for Electrical Installations
- 5.Protective equipotential bonding is achieved by
- A.
Preventing current from passing through the body
- B.
Ensuring adequate continuity between extraneous conductive parts
- C.
Automatic disconnection of supply in the event of a fault
- D.
Separation of equipment from the supply using a safety isolating transformer
- 6.The type of earthing arrangements requiring a consumer’s earth electrode to be installed is where
- A.
No earth facility is supplied by the distributor
- B.
The supply is from a low voltage generator
- C.
Earthing is via the distributor’s cable armour
- D.
The electrical system is TN-C
- 7.Low-voltage is defined in BS 7671 as having a value exceeding
- A.
24V ac
- B.
48V ac
- C.
50V ac
- D.
120V ac
- 8.Tables showing the classification of external influences when considering environmental conditions during the design of an installation can be found in BS 7671
- A.
Chapter 32
- B.
Chapter 53
- C.
Appendix 4
- D.
Appendix 5
- 9.An assessment must be made of harmful effects on other electrical systems when installing
- A.
Large electric motors
- B.
Fire alarm systems
- C.
Emergency lighting circuits
- D.
Reduced low voltage supplies
- 10.For a 32A ring final circuit in similar premises to a dwelling, the minimum size of thermoplastic insulated copper live conductors allowed is
- A.
1.0mm2
- B.
1.5mm2
- C.
2.5mm2
- D.
4.0mm2
- 11.In a domestic dwelling a 32A ring final circuit incorporating BS 1363 socket-outlets historically serves a floor area up to
- A.
75m2
- B.
100m2
- C.
50m2
- D.
200m2
- 12.The following final circuits are to be installed using thermoplastic insulated multicore non-armoured cables 3 x 6A lighting 1 x 20A UPS supply 3 x 32A ring 1 x 40A cooker If the cables are enclosed in a non-metalic trunking where entering the distribution board, how many live conductors would be enclosed?
- A.
9
- B.
16
- C.
22
- D.
32
- 13.
- A.
1.0mm2
- B.
1.5mm2
- C.
2.5mm2
- D.
4.0mm2
- 14.Which of the following is not a characteristic of the supply?
- A.
Nominal voltage
- B.
frequency
- C.
Earth loop impedance Ze
- D.
Power factor
- 15.The requirements for mobile or transportable units are applicable to the following types of unit
- A.
Health screening services
- B.
Pleasure craft
- C.
Mobile machinery to BS EN 60204-1
- D.
Traction equipment of electric vehicles
- 16.Basic protection by means of obstacles is intended to prevent
- A.
Ordinary persons from operating equipment
- B.
Intentional contact with exposed parts
- C.
Intentional bodily approach to a live part
- D.
Unintentional bodily approach to a live part
- 17.Which of the following is a method of fault protection?
- A.
Electrical separation
- B.
Barriers or enclosures
- C.
Insulation of live parts
- D.
Placing out of reach
- 18.
- A.
The supply point and subtracting the value of internal loop impedance (R1 + R2)
- B.
The furthest socket-outlet from the supply
- C.
The origin of supply
- D.
both the supply and at the furthest socket-outlet, and subtracting one result from the other
- 19.In a TN system, final circuits not exceeding 32A supplying fixed equipment are subject to a maximum disconnection time of
- A.
0.4s
- B.
0.8s
- C.
4.0s
- D.
5.0s
- 20.The temperature limit for metalic equipment which is intended to be touched but not hand-held is
- A.
30 degrees Celsius
- B.
55 degrees Celsius
- C.
65 degrees Celsius
- D.
70 degrees Celsius
- 21.
- A.
Due to low insulation resistance
- B.
In a circuit which is electrically sound
- C.
Due to a fault of negligible impedance
- D.
In a line conductor in contact with earth
- 22.The prospective fault current at the origin of a single-phase installation is the greater of the prospective
- A.
Maximum demand and diversity value
- B.
Short circuit and overload current
- C.
Design current and distributor’s main fuse
- D.
Short circuit and earth fault currents
- 23.To meet the requirements of BS 7671, all overcurrent devices without upstream backup protection must
- A.
Be rated lower than the design current
- B.
Meet the requirements of BS 7846
- C.
Be able to withstand the prospective fault current
- D.
Not operate due to a line to earth fault
- 24.Which of the following devices can not be used for emergency switching?
- A.
A push-button controlling an all-pole contactor
- B.
A manually operated switch
- C.
A circuit-breaker
- D.
A luminaire support coupler
- 25.Which of the following arrangements of a firefighter’s switch controlling a discharge lighting installation would comply with BS 7671?
- A.
Switch with off position at the bottom and mounted at 2.75m from the ground
- B.
Switch with off position at the top and mounted at 3.75m from the ground
- C.
Switch with off position at the bottom and mounted at 3.75m from the ground
- D.
Switch with off position at the top and mounted at 2.75m from the ground
- 26.Where overvoltage protection is to be provided in a household appliance, the minimum impulse withstand voltage for Category II equipment would be
- A.
1.5kV
- B.
2.5kV
- C.
4.0kV
- D.
6.0kV
- 27.In locations with risk of fire due to the nature of processed or stored materials (conditions BE2), a wiring system which requires protection by a suitably rated RCD is
- A.
Overhead busbar trunking
- B.
Powertrack systems
- C.
90 degrees Celsius thermosetting cables
- D.
MICC cables
- 28.Which of the following external influences would likely require an increase in the current rating of cables above that normally required?
- A.
Exposure to flooding
- B.
An ambient temperature below 0 degrees Celsius
- C.
Exposure to mechanical damage
- D.
An ambient temperature of 40 degrees Celsius
- 29.
- A.
Less than 25 litres in capacity
- B.
Of a type where combustion produces smoke and gas
- C.
Of quantity 25 litres and above
- D.
In a location under supervision of instructed persons
- 30.The symbol used to denote the rating or setting of a protective device is
- A.
I2
- B.
In
- C.
Ib
- D.
Iz
- 31.
- A.
Brown, black, black, blue
- B.
Black, brown, grey, blue
- C.
Brown, black, grey, blue
- D.
Brown, blue, grey, black
- 32.At which of the following protective conductor terminations would a warning notice not need to be fixed
- A.
An earth electrode
- B.
A connection to exposed structural metalwork
- C.
A gas service metal pipe
- D.
Main earthing terminal in a distribution board
- 33.A device capable of making and breaking load current and automatically breaking fault current is a
- A.
BS 88-2 fuse
- B.
Residual current device to BS EN 61008
- C.
Circuit-breaker
- D.
Disconnector
- 34.Extraneous-conductive-parts require protective equipotential bonding to ensure that
- A.
The exposed parts are isolated from earth
- B.
No dangerous potential difference can occur
- C.
Utility pipes can be used as earth electrodes
- D.
No connection with a cpc is required
- 35.Where the supply to a caravan park is PME, a TT system of earthing must be used in the supply to
- A.
Underground cables
- B.
Pitch socket-outlets
- C.
Lighting circuits
- D.
Instantaneous water heaters
- 36.Except where PME conditions apply, main protective bonding conductors shall have a cross-sectional area not less than
- A.
Half the c.s.a. of the earthing conductor of the installation subject to a minimum of 6.0mm2
- B.
The c.s.a. of the earthing conductor of the installation subject to a minimum of 6.0mm2
- C.
Twice the c.s.a. of the earthing conductor
- D.
Half the c.s.a. of the earthing conductor of the installation subject to a minimum of 10.0mm2
- 37.When using a Class II electric drill outdoors, BS 7671 requires that
- A.
The earth loop impedance at the drill is not less than that shown in Table 41.1
- B.
It is supplied from a BS EN 60898 protected socket-outlet
- C.
An earth connection is made to the drill casing
- D.
It is supplied from an RCD protected socket-outlet
- 38.A 13A socket outlet in a garage of a domestic dwelling must have the following
- A.
Basic protection, fault protection and RCD protection not exceeding 30mA
- B.
Protection by a 30mA RCBO
- C.
Basic protection and additional protection
- D.
Ingress protection to IP56
- 39.Socket-outlets supplying 230V equipment used in the garden must be protected by a residual current device. This device is fitted because the equipment is being used
- A.
Within the equipotential zone and requires additional protection
- B.
Where the earth loop impedance Zs can not be determined
- C.
Where the overload tripping time exceeds 5 seconds
- D.
Outside the equipotential zone and requires additional protection
- 40.
- A.
3.7W
- B.
37W
- C.
0.37kW
- D.
3.7kW
- 41.The circuit of a safety service should be
- A.
Coloured red
- B.
Independent of any other circuit
- C.
Housed in compartmentalised trunking
- D.
Unprotected
- 42.Where an installation and generator are not permanently fixed, every circuit must be protected by a residual current device with a maximum I∆n rating of
- A.
10mA
- B.
30mA
- C.
100mA
- D.
500mA
- 43.In Zone 1 of a bathroom, the following fixed equipment may not be installed
- A.
Whirlpool units
- B.
Towel rails
- C.
Shaver supply units
- D.
luminaires
- 44.The correct temperature rating of the insulating material for flexible cables installed in a hot air sauna is?
- A.
60 degrees Celsius
- B.
105 degrees Celsius
- C.
90 degrees Celsius
- D.
170 degrees Celsius
- 45.A reduced low-voltage supply is strongly preferred on a construction site to supply portable equipment with a loading less than
- A.
0.375kW
- B.
1.0kW
- C.
2.0kW
- D.
3.75kW
- 46.In agricultural premises, a residual current device is required for protection against fire. The RCD operating current must not exceed
- A.
30mA
- B.
150mA
- C.
300mA
- D.
500mA
- 47.The main wiring installed in a frequently used touring caravan should preferably be inspected and tested at intervals not exceeding
- A.
1 year
- B.
3 years
- C.
5 years
- D.
Change of owner
- 48.The maximum disconnection time for circuits supplying fixed equipment used in highway power supplies is
- A.
0.1s
- B.
0.4s
- C.
0.5s
- D.
5.0s
- 49.
- A.
Protective conductors of minimum csa 2.5mm2
- B.
A high integrity protective conductor connection
- C.
Connection to the supply via a PME facility
- D.
Connection via socket-outlets to BS EN 60309
- 50.Which of the following requirements is not part of the inspection of fixed equipment, when inspecting and testing an installation in accordance with BS 7671?
- A.
Presence of BS mark or certification
- B.
Correct selection and erection
- C.
No visible damage
- D.
Type acceptable to the electrical distributor
- 51.A legible diagram, chart or table relating to an installation must provide information
- A.
Necessary for testing the characteristics of protective devices
- B.
Necessary for the identification of protective devices
- C.
Detailing the maximum earth fault loop impedance values
- D.
That enables the maximum demand to be determined
- 52.A test simulating a fault condition would be used when testing
- A.
Residual current devices
- B.
Polarity
- C.
Insulation of non-conducting floors
- D.
Insulation resistance
- 53.In agricultural and horticultural premises all circuits other than for socket-outlets must be protected by an RCD with an operating current not exceeding
- A.
30mA
- B.
300mA
- C.
500mA
- D.
1.0A
- 54.The test voltage required to carry out an insulation resistance test on an installation where the nominal supply voltage is 750V is
- A.
250V dc
- B.
500V dc
- C.
1000V dc
- D.
1500V dc
- 55.No alteration, temporary or permanent, shall be made to an existing installation unless the
- A.
Electricity distributor has been informed
- B.
Building Control has been informed
- C.
Existing equipment is adequate for any additional load
- D.
Existing equipment meets UL and CSA standards
- 56.A signed Electrical Installation Certificate must indicate responsibility for the installation’s
- A.
Design, construction, inspection & testing
- B.
Design, material standards and construction
- C.
Construction, environment and design
- D.
IP Ratings, design, inspection & testing
- 57.An Electrical Installation Condition Report together with appropriate schedules shall be given to the
- A.
Original installer
- B.
Person ordering the inspection
- C.
Representative of the distributor
- D.
Installation designer
- 58.Which of the following classifications of external influence would be appropriate for electrical equipment installed where subject to ‘splashes of water’?
- A.
AB
- B.
BC1
- C.
AD4
- D.
AG1
- 59.If a 63A BS 88-2 protective device operates 5 seconds after a fault develops, the approximate value of fault current will be
- A.
30A
- B.
63A
- C.
280A
- D.
500A
- 60.
- A.
0.39
- B.
0.45
- C.
0.57
- D.
0.69
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