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WorksheetsNETK3-04
Total questions: 33
Worksheet time: 33mins
The statutory regulations that set standards which are intended to reduce the risk of electric shock, burns and fire, due to the use of electrical systems, are the:
Electricity at Work Regulations
IEE Wiring Regulations
Personal Protective Equipment Regulations
Health and Safety at Work Act.
Specific guidance is given to the selection of cables, isolation, switching, and inspection and testing for electrical installations in the: ________
Health and Safety at Work Act
Electricity at Work Regulations
Electricity Supply Regulations
IET Wiring Regulations.
In high rise buildings lightning conductors must be bonded to the:
building girder work
water and gas supplies
the installation earth
earthing rod.
BS EN numbers relating to electrical equipment signifies compliance with British and:
International standards
European standards
English standards
Insulation standards.
Exploded views in manufacturers’ manuals are generally used to show:
large machine parts
machines having few parts
wiring diagrams of machines and systems
complex components having many parts.
An electrical contractor, compiling a list of materials and equipment required to complete an installation, will need access to:
delivery records
drawings and specifications
circuit diagrams
day work sheets and variations.
A line on a drawing measuring 200mm, representing a wall on a site measuring 200m will be drawn to a scale of:
1:500
1:1000
1000:1
500:1.
Where two-way switches are used as part of a lighting circuit, these switches will provide, in accordance to BS 7671:
emergency switching
isolation
mechanical maintenance
functional switching.
Circuits that are used to measure and control temperature, air flow and humidity in a building are called:
emergency management circuits
environmental control circuits
power control circuits
security con.
Which of the following wiring systems allow for easy replacement and addition of cables?
PVC conduit
steel-wire-armoured cable
mineral insulated cable
metallic cable trunking.
In an installation where appearance is the most important consideration, the most likely choice of a wiring system will be:
ladder racking
mineral insulated cable
steel-wired-armoured cable
metallic, perforated cable tray.
When deciding the maximum fixing distances for conduit saddles, reference should be made to
BS 7671
On-site guide
Guidance notes 3
The Electricity at Work Regulations.
Specialist cables and installation techniques will be required for:
power supplies to motors
closed circuit TV and data transmission
ring final circuits and domestic lighting
block storage heating.
Copper cored data communication cables are made up of pairs of conductors twisted along their length in order to:
reduce electrical interference
add strength to the cable
reduce overall cable size
increase the cable current rating.
A component designed to disconnect a supply under full load conditions is:
a fuse
an isolator
a detector
a switch.
In situations where there is a risk of an explosion due to the presence of fumes and gases electrical switches and control equipment must be:
remotely controlled
mounted in flameproof enclosures
placed outside the danger zone
connected to a low voltage supply.
The type of earthing arrangement which generally uses the supply cable metal sheath or armouring as the earth return path is known as:
TT
TN-C
TN-C-S
TN-S.
The TT system of earthing is usually used in:
rural areas
urban areas
domestic installations
industrial installations.
An earthing system that can only be used in special circumstances and uses a combined neutral and earth conductor in the supply and the installation is the:
T T system
T N-S system
T N-C-S system
T N-C system.
An isolator used to provide isolation of electrical supplies is designed to operate under:
full load conditions
no-load conditions
overload conditions
short circuit conditions.
Before commencing work on a construction site, a contracting electrician must identify:
hazards and personal protective equipment required
the location of the canteen and dining facilities
the site manager’s office
the name and telephone number of the client.
When working on electrical circuits, the supply should be:
switched off using stop buttons
short circuited to ensure it is not live
isolated and locked in the off position
left connected and treated with care.
Inspection bends, elbows and conduit boxes should be used on long conduit runs to provide a means of:
testing cables after completing the installation
reducing vibration in the conduit
improving the appearance of the installation
reducing stress on cables when drawing them in.
When using metal trunking, continuity is maintained at all joints by:
fitting copper continuity straps
brazing the joints
removing the paint from the trunking
drilling and fitting extra fixing screws.
Spring toggles and screws are used when fixing electrical equipment to:
hollow walls
brick walls
concrete ceilings
wooden floors.
Steel-wired armoured cables must be supported at regular intervals as specified in BS 7671 in order to:
reduce vibration in cables
reduce stress on cables
increase air circulation round cables
improve the appearance of installations.
After cutting and threading conduit, burrs should be removed using a:
reamer
pair of pliers
knife
spanner.
Portable power tools should be inspected:
every three months
after being repaired
before and after use
when being serviced.
Holes in floors and ceilings should be restored on completion of an installation, with suitable materials and to the original thickness, in order to:
prevent the loss of heat
restore the strength of the building
secure cables and conduits installed
prevent the spread of fire.
Three factors which would affect the choice of wiring system would include:
ambient temperature, aesthetics and presence of livestock
the ability of the installer, regulatory requirements and erosion
corrosion, erosion and the current seasonal condition
personal stress, strain and regulatory requirements.
When calculations show that the voltage drop between the supply terminals and a lighting load will exceed 3% of the supply voltage, the action to be taken is:
limit the time the load is connected
increase the supply voltage using a transformer
increase the size of the cable supplying the load
connect the load at off peak times only.
To comply with IEE Wiring Regulations the voltage drop on a three phase 400V power circuit should not exceed:
4V
8V
20V
32V
Dangerous waste materials produced when terminating optical cables should be:
taken off site and placed in suitable containers
left on site with instructions for disposal
thrown outside buildings
ignored and left in situ.
