railway RRB JE (CBT I + CBT II) Mock Test 2024 Estimation and Costing Earthing Practices

In case of strip earthing, if the electrode is made of copper, then its cross-sectional area should NOT be less than _______.

1
2.5 mm × 16 mm
2
25 mm × 1.6 mm
3
2.5 mm × 40 mm
4
25 mm × 4 mm 
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