NEIEP Mechanics Practice Exam

With a standard 3 phase AC motor lead marking, what is the marking on the other end of the winding that begins at T1?

1. T2

2. T3

3. T4

4. T5

The correct answer is: T4

In a standard three-phase AC motor, the leads are typically marked sequentially to indicate their respective connections to the motor windings. When starting at T1 for one phase of the motor winding, the designation for the end of that winding would follow the established labeling convention of winding terminals. The labeling of the terminals proceeds in a sequential manner for each winding phase. Therefore, if T1 is the starting point of the first winding, the corresponding terminal marking for the end of that same winding is conventionally denoted as T4. This allows for a clear and systematic identification of the motor windings, which simplifies circuit connections and troubleshooting. Thus, when referencing a standard configuration, the other end of the winding starting at T1 would logically be marked as T4, ensuring consistency across three-phase motor designs and facilitating proper electrical connections.