
bonding and earthing

Quiz
•
Physics
•
12th Grade
•
Hard

Kieran Raynes
Used 2+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of earthing in electrical installations?
To provide a path for telegraph signals
To limit the duration of touch voltages to prevent electric shock
To reduce the cost of electrical installations
To improve the efficiency of electrical appliances
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does bonding aim to achieve in an electrical installation?
To separate metallic parts from each other
To reduce the risk of electric shock by equalizing potential
To facilitate the flow of fault current to earth
To increase the magnitude of touch voltage
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which document covers the safety requirements for earthing and bonding?
Health & Safety Executive guidelines
IET Wiring Regulations
BS7671
National Electrical Code
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a TN-S earthing system?
A system that uses the earth as a conductor
A system with multiple neutral-to-earth connections
A system with a single neutral-to-earth connection near the supply transformer
A system without its own earth connection
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the maximum external earth fault loop impedance for TN-C-S systems?
0.35 Ω
1.0 Ω
0.8 Ω
22 kΩ
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why might the TN-C-S arrangement be hazardous?
If the PEN conductor becomes an open circuit
If it is used in rural areas
If multiple users utilize one supply cable
If it is used in petrol stations
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is required for a TT system?
Multiple neutral-to-earth connections
A combined neutral and PEN return path
Consumers must supply their own earth connection
A separate route back to the sub-station transformer
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