what is the thumb rule or formula for cable size and current ratings

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length of 4 core cable 95mm from substation LV VFD panel to Motor at field approximately 150 meter. Motor stop and power has been isolated from LV MCC ( Substation )to disconnect Motor for services. After Motor completed service propose to reinstall and reconnect Motor Cable, found earth cable sparkling during touching at metal / motor body. Inspect by clamp meter found earth cable have current flow AC 1-2amps and all earth cable at MCC LV also have current flow as same value. why it is happen?

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No load test of induction motor is carried out to compute= A stator resistance B rotor resistance C magnetizing reactance D rotor reactance

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What is tan delta & PPM in transformer? and whats its IS value?

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What are the disadvantages of thermal power plant?

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what is rated current and operating current?

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What is the need of motor starter?

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What is the power plant or power station?

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How I calculate the ELCB for circuit breakers?

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1. what type of winding of slip ring ac induction motor rotor and why. 2. how the heating element use in two phase (415 volt)and what rating of element, you prefered.

1 Answers   Simbhaoli Sugars,

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Compare salient pole and Hndrical rotor machines.

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please describe the Transformer setting, Motor setting, I/C setting, Tie setting

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