Quick Earth Loop Impedance Quiz

TNS earthing systems use the

• supply cable armour
• earth electrode
• neutral
• transformer

The symbol Ze is associated with

• total loop impedance
• external suppliers earth loop impedance
• R1
• R2

A TNCS earthing system, changes Line to c.p.c faults to

• Line to neutral faults
• Line to Line faults
• Line to c.p.c faults
• c.p.c to Line faults

The symbol for Total earth loop impedance is?

• Zs

• Ib

• Iz

• Ze

which earthing system requires an earth electrode?

• TNC
• TNS
• TN-C-S
• TT

Which one of the following are non-statutory regulations?

• Electricity at Work Regulation
• Manual Handling Regulation
• BS 7671
• Provision and use of Work Equipment Regulations

What is represented by Zs in the following formula: Zs=Ze+(R1+R2)?

• Total earth fault loop impedance

• External earth fault loop impedance

• Final circuit earth fault loop impedance

• Combined resistance of the earth path

What is represented by R1 in the following formula: Zs=Ze+(R1+R2)?

• Resistance in the line conductor

• Resistance in the earth conductor

• Total earth fault loop impedance

• External earth fault loop impedance