electric ppt 2 new

In which earthing system are the neutral and earth separate?

• TN-S

• TN-C-S

• TT

• TN-C

Which component in the TN-S system is responsible for isolating the electrical supply?

• RCBO's

• Main switch

• Electrical company isolator

• Gas meter

What does RCBO stand for in the context of the TN-S system?

• Residual Current Breaker with Overload

• Reactive Circuit Breaker Output

• Regulated Current Breaker Overload

• Rotational Circuit Breaker Output

What is the purpose of the water service pipe in the TN-S system?

• To supply gas

• To provide earthing

• To deliver water

• To measure electricity

What is applied to the copper pipe in the TN-C-S system?

• Insulation tape

• Bonding strap

• Rubber seal

• Metal clamp

What is the purpose of the bonding strap in the TN-C-S system?

• To insulate the pipe

• To connect the pipe to the earth

• To support the pipe

• To prevent leaks

What does the consumer unit in the TN-C-S system contain?

• Fuses and switches

• Water pipes

• Gas valves

• Insulation materials

What is the minimum CSA for bonding conductors in a TT system?

• 4mm²

• 5mm²

• 6mm²

• 7mm²

What is the role of the main switch in a TT system?

• To increase voltage

• To disconnect the power supply

• To regulate current flow

• To measure power usage

What is the voltage step down from and to in a substation transformer for three-phase supplies?

• 11kV to 230V

• 11kV to 400V

• 400V to 230V

• 230V to 11kV