Leads on motor connection diagrams are numbered according to standard as what?

• A. T1, T2, T3
• B. L1, L2, L3
• C. A1, B1, C1
• D. U1, V1, W1

Answer: (A)

Leads on motor connection diagrams are identified by the starts of the three windings as T1, T2, and T3. This standard labeling keeps the three windings clearly identifiable, with the opposite ends usually labeled T4, T5, and T6. Wiring in star or delta often pairs T1 with T4, T2 with T5, and T3 with T6, making the diagram easy to follow and the connections consistent across different motors and diagrams. The other designations (like L1-L3 for supply lines, or U1/V1/W1 in other schemes) aren’t the winding-end identifiers used in these motor diagrams, so they don’t match the usual naming convention shown.