Earthing arrangements

What does MET stand for?

• Mega Earthing Terminal

• Multiple Earthing Terminal

• Master Earthing Terminal

• Main Earthing Terminal

The perspective Fault Current (PFC) is determined by dividing the supply voltage by the overall impedance. The lower the PFC the (blank) the Impedance zs?

If the impedance is higher the circuit will disconnect quickly

• True

• False

An earthing arrangement where the supply earth is separate from the Neutral is called

• TNCS

• TNS

• TT

• IT

An earthing arrangement where the supply earth is combined initially then separate from the Neutral is called

• TNCS

• TNS

• TT

• TNC

An earthing arrangement where the supply earth is not provided by the supply regulator and an earth electrode is installed instead is called

• TNCS

• TNS

• TT

• IT

The equation for impedance is

• ZS=ZE-(R1+R2)

• ZE=ZS+(R1+R2)

• ZE=ZS-(R1+R2)

• ZS=ZE+(R1+R2)

The unit given to Impedance is

• Ohm

• Amperes

• Volts

• Resistance

The C in TNCS means

• Corona

• Combined

• Colour

• Earth

What is the maximum disconnection time for any TN earthing arrangement?

• 0.1 seconds

• 0.2 seconds

• 5 seconds

• 0.4 seconds