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Discussion Starter #1
First of all i am not well at english.so please excuse me.
When i was working on a motor control panel which is 120V control, i found some neutral connections are taken from supply transformer instead of control transformer(380V/120V) to complete the control circuit.
My question is, is it necessary to run neutral connection from control transformer to control all the motors?? If yes, why?
 

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Your control circuit can come from your control transformer as long as your VA rating is correct and can handle the load. Or control power can come from another source but the neutrals need to go back to there source,NO CROSSING. And if you have 120 volt control then you need a neutral.
 
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