What is the objective of the lesson on Earthing, Protective Conductors & ADS?

• To learn about the types of earthing systems

• To understand how an earth fault affects metalwork throughout the installation and its dangers

• To study the history of earthing and protective conductors

• To practice installing protective conductors

What are main protective bonding conductors used to connect in every installation?

• Electrical devices to the power supply

• Extraneous-conductive-parts to the main earthing terminal

• Non-conductive parts to the electrical grid

• The main earthing terminal to the electrical installation

How is an extraneous conductive part defined in BS 7671?

• A conductive part forming the main part of the electrical installation

• A non-conductive part not liable to introduce a potential

• A conductive part liable to introduce a potential, generally Earth potential, and not forming part of the electrical installation

• A conductive part that is insulated from Earth potential

Which of the following is an example of an extraneous conductive part?

• Plastic water pipes

• Wooden building structures

• Metal water pipes

• Glass windows

What is the purpose of the green and yellow striped conductors shown in the diagram?

• To supply power to the systems

• To act as protective conductors for earthing

• To carry data signals for communication

• To provide insulation against electrical faults

What is the purpose of the main protective bonding conductor in the earthing system?

• To provide a path for the fault current to flow back to the supply transformer

• To supply power to electrical devices

• To measure the resistance in the circuit

• To insulate the earthing conductor

What is connected to the 'star point' in the diagram?

• Earth electrode

• Neutral conductor

• Protective devices

• Main protective bonding conductor

What does CPC stand for in the context of this earthing system diagram?

• Central Protection Circuit

• Circuit Protective Conductor

• Current Protection Component

• Circuit Power Controller

Which of the following is directly connected to the earth electrode?

• Supply transformer

• Protective devices

• Earthing conductor

• Main protective bonding conductor

What is the most common measure used for fault protection in electrical systems?

• Automatic reconnection of supply

• Manual disconnection of supply

• Automatic disconnection of supply (ADS)

• Periodic circuit inspection