To protect the equipment from excess current
To maintain the line current constant
To maintain the supply voltage constant
To increase the life of the equipments
earth terminal
phase terminal
neutral terminal
live terminal
for over current
for high voltage
for leakage current
for low voltage
Red
Green
Black
Blue
To prevent a damage to the Insulation of wires
To prevent a damage to the wires
For safe current flow
To pass the leakage current to the earth