EL03 7
Electrical Safety and Circuit Protection Quiz
Test your knowledge in electrical safety and circuit protection with this comprehensive quiz. Designed for electrical professionals and students alike, it covers key concepts crucial for anyone working with electrical systems.
Engage with 10 multiple choice questions that will challenge your understanding of:
- Fault Loop Impedance
- Overcurrent Definitions
- Cable Ratings and Compliance
- Short Circuit Current
The term 'direct contact ' would apply to a person touching:
A live conductor
A normally live terminal and earth at the same time
A neutral conductor and earth
A part that has become live due to an insulation failure
What is the maximum allowable length, with regards to fault loop impedance, for a 25mm² Cu 2C+E orange circular TPS cable if it was protected by a 100A type B circuit breaker?
53m
66m
99m
124m
An over current is:
A current occurring in an electrically sound circuit
An overload current or a short circuit current
The perspective short circuit current
The maximum demand current
When an electrical circuit is protected by an HRC fuse, the current carrying capacity of the cable must be de-rated by a factor of:
1.1
0.5
0.9
0.75
The maximum demand current must be:
Greater than or equal to the rating of the protective device
Less than or equal to the current rating of the protective device
Equal to the current carrying capacity of the cable
Greater than the the current carrying capacity of the cable
Will a circuit wired with 2.5mm cable with a current carrying capacity of 18 amps, connected to a load drawing 18 amps and protected by a HRC fuse comply with AS3000 wiring rules?
Yes
No
The current ensuring effective operation of a circuit breaker in conventional time is:
1.45 X In
1.6 X Iz
0.9 X Iz
1.45 X Iz
The nominal perspective short circuit current at the point of supply for a suburban residential area is:
6kA
10kA
25kA
30kA
What is the full load current of a three-phase supply transformer with ratings of 230/400 volts, 509 kVA and an impedance of 0.016 ohms(
72.1 amps
650 amps
721 amps
14, 375 amps
The term discrimination when applied to circuit protection means:
The fuse circuit breaker with the highest fault current rating should operate first
Circuit protection on the main switchboard should be the first to operate
The circuit protection should be able to discriminate between a short circuit to earth and a short circuit between active conductors
The circuit protective device closest to the fault or overcurrent should operate before any upstream devices
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