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

ISI कोड के अनुसार तांबे के भूसम्पर्कन प्लेट का न्यूनतम आयाम क्या है?

1
60 cm × 30 cm × 6.38 mm
2
60 cm × 60 cm × 6.38 mm
3
60 cm × 60 cm × 3.18 mm
4
30 cm × 30 cm × 3.18 mm
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