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What class does the slot and phase insulation belong to?(a) B(b) Y(c) H(d) EI had been asked this question in an internship interview.This interesting question is from Stator Winding topic in section Three Phase Induction Motor of Design of Electrical Machines

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Correct ANSWER is (d) E

Best explanation: The modern insulating materials for diamond coils BELONG to class E, B and F. The slot and phase insulation is POLYESTER foil coated with compressed FIBRE for Class E.



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