Quiz on Supply Earthing Arrangements

After the session on Supply Earthing Arrangements, what should you be able to describe?

• The differences between two common earthing systems/arrangements

• The differences between three common earthing systems/arrangements

• The similarities between three common earthing systems/arrangements

• The cost analysis of three common earthing systems/arrangements

What should you be able to show regarding each earthing system after the session?

• The earth fault path for each system

• The electrical resistance for each system

• The installation process for each system

• The maintenance schedule for each system

Why is an RCD required for a TT earthing systems?

• To increase the energy efficiency of the system

• To monitor the power usage of the system

• To provide additional grounding for the system

• To protect against earth faults in the system

How many common earthing arrangements are mentioned in the supply earthing arrangements?

• One

• Two

• Three

• Four

What does TN-C-S stand for in the context of electrical systems?

• Terra & Neutral combined at the supplier authorities substation and separated at the installation before the meter

• Terra & Neutral combined at the meter and separated at the consumer's unit

• Transformer & Neutral combined at the supplier authorities substation and separated at the installation before the meter

• Terra & Neutral combined at the consumer's unit and separated at the supplier authorities substation

What is the value of the external earth loop impedance (Ze) in the TN-C-S system shown in the diagram?

• 0.15Ω

• 0.25Ω

• 0.35Ω

• 0.45Ω

What does TN-C-S stand for in electrical installations?

• Terra & Neutral combined at the supplier substation and separated at the consumer's installation

• Terra & Neutral combined at the consumer's installation and separated at the supplier substation

• Terra & Neutral combined at the meter and separated at the consumer's installation

• Terra & Neutral combined at the consumer's installation and not separated

What is the cross-sectional area of the circuit protective conductors shown in the diagram?

• 16mm²

• 10mm²

• 100A

• Not specified in the diagram

Where is the main switch located in the electrical installation diagram?

• In the consumer unit

• After the metal water pipe

• Before the gas meter

• At the supplier's substation

What does TN-S stand for in the context of the electrical system shown in the image?

• Terra & Neutral - Separate

• Terra & Neutral - Shared

• Transformer & Neutral - Separate

• Transformer & Neutral - System