Please choose the correct earthing system.

• TN-C

• IT

• TN-S

• TT

Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.

• TRUE

• FALSE

Please choose the correct earthing system

• TT

• TN-C

• TN-C-S

• IT

Why there is no effect of electric shock occurs on the bird?

• Bird standing on neutral line

• Both of the bird’s feet touch the same line

• Both of the bird's feet is high resistance

• One of the bird's feet is not touch the line

Please choose the correct earthing system

• TN-S

• TT

• IT

• TN-C

Please choose the correct earthing system

• TN-C

• TT

• IT

• TN-S

Please choose the correct earthing system.

• TN-C-S

• TN-S

• TN-C

• IT

International standard IEC 60364 distinguishes three families of earthing arrangements, using the two-letter codes TN, TT, and IT. The first letter indicates the connection between earth and the power-supply equipment (generator or transformer)

• FALSE

• TRUE

Please choose the correct earthing system.

• TN-S

• TN-C-S

• TT

• IT

Please choose the correct earthing system.

• TT

• IT

• TN-C

• TN-C-S