Live testing is performed on the circuits after they are energized to measure the impedance of the earth fault loop and to check functionality of residual current devices. These tests identify how fast the circuit protection will operate.
The Megger test is a method of testing making use of an insulation tester resistance meter that will help to verify the condition of electrical insulation. The IR gives a measure of the enduring power of an insulator to bear the service voltage without any current leakage path.