NEIEP Electrical Theory And Application (430) Practice Exam

In an unmarked 9-lead motor, which leads are the two ends of the same coil?

T1 and T4 T2 and T5 T7 and T8 T9 and T3

Correct Answer:

T1 and T4

Explanation:

In a 9-lead motor, there are three windings, each with two ends and a center tap. The two ends of the same winding show the full winding resistance between them, while each end to its center tap reads about half that resistance, and the center taps themselves are separate leads. Typically the windings are paired as follows: ends T1 and T4 with center tap T7 form one winding; ends T2 and T5 with center tap T8 form another; ends T3 and T6 with center tap T9 form the third. So the two ends of the same coil are T1 and T4.

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