Answer Posted / suburavichandran

only 3 phase motors are connected with such 3c cables. it is because the 4th core is used for neutral return particularly during unbalanced condition.It rises when each phase is connected to different single phase loads.since 3phase motors are balanced loads.there s no need for the 4th core i mean neutral.

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ITI r/tv trade APPLY (J.T.O VACANCEY) ALSO INCLUD AITT ELECTRONIC,WRITEEN XAM DONE 23.03.10 BUT NO RESPONCE WHY ANATHER ID gopal_gh007@rediffmail.com

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