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What will be the size of cable required for 5.5 KW motor (
Full load current 10 Amps approx.), Starting current with
DOL is 120 Amps. Aprrox. Short circuit current with LLLG
fault is 2000 Amps Approx.
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Answer Posted / birinchi87
4 sq. mm is sufficient. In our plant we are using 2.5 sq. mm for 5.5 KW and 4 sq. mm for 11 KW.
| Is This Answer Correct ? | 18 Yes | 11 No |
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In Air circuit breaker LSIG protection unit is used. Without fault in cables (2 runs 3Cx150Sq.mm Copper, 1Kv grade, XPLE armored cable IR value is more than 550Mohm @ 500V Megger) and load section Long time Overcurrent protection is triggers and trips the unit. We changed LSIG protection with new factory tested unit. Even then fault is persisting. Please suggest the possible causes
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