EARTHING - Practice Mode

1) Which instrument is used to measure earth resistance?
Correct Answer: Earth tester
2) What principle earth tester works?
Correct Answer: Fall of potential method
3) What is the reason for supplying AC to the electrodes for measuring earth resistance?
Correct Answer: Avoid the effect of electrolytic Emf interference
4) How many primary winding required in ELCB?
Correct Answer: Two primary windings
5) What is the purpose of the ELCB?
Correct Answer: Protect the residual current