WorksheetsElectrical installation 203 2
Total questions: 20
Worksheet time: 10mins
Which flexible cable would you use for connecting a boiler or electric heater?
90 degree heat resistant thermoplastic PVC
SWA
185 degree glass fibre insulated braided cable
Mineral Insulated cable
Which type of cable would be the best for mechanical protection outdoors
Mineral Insulated
FP 200
HOFR flex
SWA
What colour is a 30 A 3036 fuse?
Blue
White
Red
Green
What is the main use of an RCD in a standard domestic installation?
Additional protection
Automatic disconnection of supply
Class 2 fittings
Supplementary bonding
Where would you most likely use metal trunking?
For data cables in a commercial setting
Industrial installation with singles wiring
Embedded in a wall behind plasterboard
Instead of skirting board in a house
What will affect PVC conduit factor apart from length?
Number of bends in conduit
Type of conduit
The colour of the conduit
the amount of saddles used
When do you need a ferrule on FP200 cable?
Always
If used in wet areas
If it has a silicone inner sheath
Only on red FP200
What does LSF stand for as in cable type?
Lots of small filings
light sheath fire
Low smoke and fume
lots of stranded fibres
What is the disconnection time for a circuit with a 6A MCB?
0.4 seconds
7 seconds
5 seconds
6 seconds
What type of support is the best for lots of small cables?
Basket tray
Conduit
Trunking
Clipped direct
What type of fuse is a BS 3036?
Plug top
cartridge fuse
GM fuse
rewireable fuse
What type of fuse is a BS 1362?
Rewireable fuse
plug top fuse
GM fuse
Cartridge fuse
What rating needs to be equal or higher than the In rating?
Rated current of the protective device
Current carrying capacity due to installation conditions
Design current
Fuse/ MCB breaking capacity
Which one of the following do you not need to consider for cable correction factors?
Ambient temperature
If the cable is buried
If there are more than one cable ran together
How many bends are in the cable
What is the maximum volt drop allowed for power circuits?
10%
3%
5%
8%
What is the maximum volt drop allowed for lighting circuits?
5%
10%
3%
8%
What causes an RCD to operate?
Heat
Magnetism
humidity
time
What must be connected to main bonding conductors?
Incoming metal water and gas pipes
Incoming plastic water and gas pipes
metal heating system pipes
metal taps and sinks
On a TNS earthing system is the earth.....
Separate to the supply neutral coming in
Combined with the neutral cable coming into the property
provided by the customer
Not available
What is a BSEN 60898?
RCBO
RCD
MCB
Rewireable fuse
