WorksheetsBS 7671 Part 1
Total questions: 25
Worksheet time: 13mins
Who can carry out an initial verification of an installation? Mark one answer
A. A member of the public
B. A skilled competent person
C. An instructed person
D. The owner of the installation
What is the maximum d.c. circuit voltage covered by the regulations BS 7671? Mark one answer
1000 V a.c.
1500 V a.c.
1500 V d.c.
230 V a.c.
Which of these methods is not achieving fault protection? Mark one answer
Increasing the earth fault loop impedance to a high value
Limiting the duration of a current resulting from a fault, which can pass through a body, to a non-hazardous value
Limiting the magnitude of a current resulting from a fault, which can pass through a body, to a non-hazardous time period
Preventing a current resulting from a fault passing through the body of any livestock
What characteristic of the supply must be included in an electrical installation certificate? Mark one answer
Details of the client
Particular requirements of the distributor
The material of the main protective bonding conductors
The name and signature of the installer
What is the preferred range of frequencies in BS 7671?
25 Hz, 50 Hz, 60Hz
50 Hz, 100 Hz, 400 Hz
50 Hz, 400 Hz, 1000 Hz
50 Hz, 60 Hz, 400 Hz
Conductors shall be identified in accordance with?
Section 512
Section 513
Section 514
Section 515
BS 7671 includes requirements for?
Electric fences installed on farm-land
Lift installations in office blocks
Wiring systems and cables not specifically covered by the standards for appliances
Wiring systems on military aircraft
BS 7671 is?
Non-statutory and cannot be used as evidence to show compliance, in a court-of-law
Non-statutory but can be used as evidence to claim compliance with a statutory requirement in a court-of-law
Statutory and can be used as evidence to show compliance, in a court-of-law
Statutory and cannot be used as evidence to show compliance, in a court-of-law
When designing an electrical installation, it is necessary to prevent mutual detrimental influences between the electrical installation and non-electrical installations, what should be taken into account?
Electromagnetic interference
The ambient temperature of the installation
The earth fault loop impedance
The short circuit current capacity
Where new materials are invented for use within electrical installations are departures permitted from BS 7671?
No
Sometimes when the designer feels he likes the new materials
With supporting evidence that they are a lower standard than the regulations
Yes providing the resulting degree of safety of the installation is not less than that obtained by compliance with the regulation
Which characteristics of protective equipment is not required be determined with respect to their function including protection against the effects of?
Fault current
No-voltage
Overvoltage
Under-current
Which one of these does BS 7671 NOT apply to? Mark one answer
Highway equipment
Horticultural premises
Operation and maintenance gangways
d.c. cathodic protection systems
In the case of a voltage disturbance causing a power frequency fault voltage appearing on the LV side, between the exposed-conductive parts and earth, what symbol is used? Mark one answer
A. U0
B. U1
C. Ux
D. Uf
Which of these is non-statutory? Mark one answer
BS 7671
ESQCR
HASAWA
RIDDOR
What does BS7671 apply to?
Lift installations covered by BS 5655
Mines
Prefabricated buildings
Ships
BS 7671 is NOT intended to provide safety from electric shock, which may result from?
Interruptions of electrical supply at a travelling fair
Interruptions of supply in an operating theatre
Shock currents on a marina
Unauthorized access to railway signaling equipment
Which one of these does BS 7671 NOT apply to?
Electric vehicle charging
Equipment of electric machines covered by BS EN 60204
Saunas
Swimming pools
Which of the following statements is true about BS 7671? Mark one answer
They are non-statutory and cannot be used in a court of law
They are non-statutory and cannot be used in a court of law
They are non-statutory but may be used in a court of law
They are statutory but cannot be used in a court of law
Which one of the following does BS 7671 apply to? Mark one answer
Extra low voltage lighting
It applies to all the above
Operating and maintenance gangways
Prefabricated buildings
Electrical installations must be designed by?
Electrical engineers
Equipment manufactures
Skilled persons
The electrician
Basic protection is classified as?
Protection against contact with a live part
Protection against indirect and direct contact with a live part
Protection against indirect contact with a live part
Protection against indirect or direct contact with an isolated part
BS 7671 does NOT provide requirements for electrical safety against the risk of?
Electrical fires in aircraft wiring systems
Interruptions of safety services in commercial premises
Power supply interruptions in veterinary clinics
Shock current at construction sites
A voltage of 25 volts a.c. between conductors or to Earth is defined as? Mark one answer
Extra low voltage
High voltage
Low voltage
Separated extra low voltage
Which of these is not covered by BS7671? Mark one answer
External lighting
Installations in mines and quarries
Low voltage generators
Transportable units
Which of the following does BS 7671 apply to? Mark one answer
Equipment of aircraft
Equipment of fixed offshore installations
Equipment on board ships
Marinas
