1 . Open the Isolator 1 & 2
2 . Close the Isolator 3
3 . Close the CB
4 . Close Line earth switch
5 . Close Maintenance earth switch 1 & 2
6 . Now the Induction voltage is zero in dead portion
7. Remove the earth link in the Maintenance earth switch
8. Connect the primary leads on that.
9. Start the testing
10. There is no leakage current in earth because primary current enter in to Main earth switch -1 and return at Main earth switch -2.
