Earth Loop Impedance Quiz

Which of the following is NOT a part of the earth loop impedance path?

• Circuit protective conductor

• Main earthing terminal (MET) and earthing conductor

• The path through the unearthed neutral point of the supply transformer

• The source line winding

What is the symbol used to denote the earth fault loop impedance?

• Zf

• Zs

• Ze

• Zr

In a TN-S system, which part of the earth loop impedance path is specifically mentioned?

• The supply earth

• The circuit protective conductor

• The source line winding

• The line conductor from the source to the point of the fault

What is the unit of measurement for earth fault loop impedance?

• Volts (V)

• Amperes (A)

• Ohms (Ω)

• Watts (W)

What does the external impedance (Ze) comprise of?

• Combined resistances/impedances of the fault path on distribution network operators (DNO) side of the supply intake

• Combined resistance of the consumers' line conductor (R1) and the consumers' cpc conductor (R2)

• The resistance of the metal frame of the appliance

• The resistance of the fuse board

What is the combined resistance of the consumers' line conductor (R1) and the consumers' cpc conductor (R2) referred to as?

• Ze

• Zs

• (R1 + R2)

• MET

What is the earth loop impedance (Zs) measured in?

• Volts (V)

• Amperes (A)

• Ohms (Ω)

• Watts (W)

What does the diagram illustrate in the context of electrical systems?

• The process of power generation

• The Earth loop impedance in a TT system

• The layout of a residential wiring system

• The functioning of a circuit breaker

In the provided diagram, what does "MET" stand for?

• Main Earth Terminal

• Main Electrical Transformer

• Main Energy Transfer

• Main Equipment Terminal

What is the purpose of the "cpc" in the diagram?

• To provide a path for the electrical current

• To act as a circuit breaker

• To provide a protective earth connection

• To measure the voltage