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Sir, I am a student of Thiagarajar College of Engineering, Madurai, Tamil Nadu, INDIA. I am undergoing Post Graduate Programme in Power System Engineering in the Electrical and Electronics Engineering Department of the college.I wish to get the following doubt clarified : Please suggest possible way(s) of determining whether a given three phase induction motor is connected in star or delta. The constraints being, the motor end connections are made prior, physical veification of which is not possible. and only three terminals of the motor are available externally for supply connections. No other details as regards the number of turns per phase or diameter of the conductor is possible. Please suggest also relevant books, technical literature or web sites from where detailed information regarding this may be obtained. If such a method is not available as of now, please do convey the same. My e-mail ID is : [email protected] Awaiting your response, With regards, prakash.v