TransformersQuestion 1051 of 1506

What is the most important thing to get right when three transformers are connected into a three-phase bank?

  1. The winding phasing (polarity dots)
  2. The colour of the transformer cases
  3. The weight of the three cores
  4. The wire gauge only
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Correct answer: The winding phasing (polarity dots)

Wrong phasing gives wrong voltages in the bank.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.6: Three-phase Transformer Circuits

Practice transformers

Questions last reviewed: 18 October 2026