What is the primary purpose of an RCD?

• Prevent electrical fires
• Protect against electrocution
• Reduce energy consumption
• Increase circuit capacity

Which type of cable is typically used in domestic installations?

• Mineral Insulated Copper Cable (MICC)
• Twin and Earth
• Steel-Wire Armored (SWA)
• High Voltage Cable

What should be considered first when designing a circuit?

• Insulation resistance
• Maximum demand and diversity
• Earthing conductor size
• Overvoltage protection

What is the purpose of a main protective bonding conductor?

• To increase circuit efficiency
• To connect all exposed-conductive-parts to the main earthing terminal
• To insulate the main supply
• To isolate the installation from fault current

Which is the correct earthing arrangement for most UK domestic installations?

• TT system
• IT system
• TN-C-S system
• TN-S system

What is the minimum cross-sectional area of a main bonding conductor in a typical domestic installation?

• 2.5 mm²
• 4 mm²
• 6 mm²
• 10 mm²

Which type of protective device is most suited for lighting circuits?

• RCBO
• RCD
• MCB
• Fuse link

What is the maximum permissible voltage drop for a lighting circuit?

• 0.03
• 0.05
• 0.08
• 0.1

What factor is considered when choosing a cable size?

• Expected life span
• Installation cost
• Current-carrying capacity
• Protective device brand

What document certifies the compliance of a new electrical installation?

• Part P Certificate
• Electrical Installation Certificate
• Building Regulation Certificate
• Periodic Inspection Report