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WorksheetsQuiz On Safeguard
Total questions: 26
Worksheet time: 16mins
How much energy does this appliance transfer per second?
240 V
50 Hz
130 W
N533
It is materialthat has an electrical conductivity value falling between that of a conductor, like copper, gold, etc. and an insulator, such as glass.
A semiconductor material
Conductive material
Insulator material
No Idea
It means stopping the supply to an appliance where anyone can operate it when needed.
Isolation
Connection
Electrical safety
Testing procedures
When an imbalance of current is detected in a circuit or appliance, the supply is isolated.
RCD
Isolating transformers
Circuit breakers
RCBO
It is commonly used in applications where there is the need to combine protection against overcurrents (overload and short-circuit) and protection against earth leakage currents.
RCD
Isolating transformers
Circuit breakers
RCBO
Isolates the supply from earth to protect the user from a potential voltage between earth and the live conductors.
RCD
Isolating transformers
Circuit breakers
RCBO
Electrical switch, automatically operated to protect circuits and the electrical equipment connected to it from damage caused by excess current, typically overload or short circuit.
RCD
Isolating transformers
Circuit breakers
RCBO
Provides protection to other services such as data, water and gas by requiring min distances and installation techniques that reduce damage and interference to other services.
Protection of underground cables
Electrical barriers
Service segregation
Protection of electrical circuits and equipment
What is the voltage different between Live and Neutral at secondary side of 230/230 Isolating transformer ?
0
230
400
290
What is the voltage different between Live and Neutral at Primary side of 230/230 Isolating transformer ?
0
230
400
290
What is the minimum insulation resistance between the primary and secondary windings of a fixed wired isolation transformer
1 M-ohm
2 M-ohm
3 M-ohm
999 M-ohm
What are the bonding and earthing requirements when more than one appliance is supplied from an isolating transformer?
The exposed metal of the appliances shall be effectively bonded together and earthed.
The exposed metal of the appliances shall be effectively bonded together but not earthed.
Only earthed
No Idea
Ideally, how many appliances should you have attached to an isolating transformer at any one time?
1
2
3
4
Metal part of Double insulation electrical appliance can be grounded
True
False
No problem
It is okay
Refer to Figure , Identify the class of appliance
Class I
Class II
Class III
No idea
Refer to Figure , Identify the class of appliance
Class I
Class II
Class III
No idea
Refer to Figure , Identify the class of appliance
Class I
Class II
Class III
No idea
