Describe any four methods used to reduce earth resistance.
1 Answer
Answer :
To reduce earth resistance following steps/methods are necessary: 1. Earth pit of more depth & width- breadth should be made. 2. Use of higher size/cross section of earthing material like earthing plate, earthing rod. earthing pipe, earthing wire/strip reduces earth resistance. 3. Use of copper material for earthing reduces earth resistance than use of aluminum material 4. Earth pit are generally filled with alternate layer of charcoal & salt up to 4 feet from the bottom of the pit. 5. Poured sufficient salt water in earth electrode pit. 6. Use chemical or coke/charcoal to increase conductivity, 7. Use earth conductor without joint in between. 8. Tighten the earth connections. 9. Remove Oxidation on joints. 10. Earth resistance can be reduced by increasing number of earth electrodes inter connected in parallel. 11. The electrodes and earth continuity conductor used in the circuit should be of same material i.e. copper or galvanized. 12. Electrodes should be placed in the earth in the upright vertical position.