generally in LT and MV motors we are using 3.5Coresx16,25,35,50 etc cable for supply.although motors is earthed at two point and having all protection.then why we are using that 1/2 core for earthing the motors.while in HT cable we are using only 3core cable for motor supply.generally lt and mv motors are delta connected and ht motors having star connection.whethere it is having any relation with winding connection( star or delta).all motors i am talking about are dol only.can anybody solve my confusion.thanks...

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how step up transformer step up the voltage and what is the reason behind it?

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What is pi controller?

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What are the difference between normal application Transformer and Solar application Transformer?

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Can I do body earthing of machine by using Cable armour or I have to run another GI wire for body earthing and how many wires I need to run. Is there any rule for this. eartnig

3 Answers   HAL,

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during parallel operation of two ac generator which condition must match before taking both parallel i.e speed /voltage rating /kva/exciation

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what are the factors to be considered while design the breaker either HT or LT??

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im working in one private compeny in gujarat. i was complet diploma electric in 2010 from gujarat technical board. now i want electric supervisor licence in gujarat but i dont't know when i apply? plz give me address of the licence dippartment office in gujarat. gandhinagar

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I know the Capacitor value- 12.5KVAR, voltage 440V gas filled, then what is the formula for calculate the microfarad value for this 12.5KVAR capacitor

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A 11 KV motor is working. if the supplay is fail. what will happened with it's breaker? Trip / remain the same condition?

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Why do we use center tap transformer that used with portable tools

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how could we findout the lightning arrester failed or not in live circuit? Is there any instrument to measure the high voltage at the time of sky lighting?

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