Which statement about secondary bushing labeling is true?

• A. Secondary labeling changes with polarity
• B. Secondary labeling changes with voltage
• C. Secondary labeling is fixed and never changes
• D. Bushing labeling is unrelated to polarity

Answer: (A)

Polarity drives how secondary bushing labels are assigned. The labels on the secondary bushings indicate which terminal is the reference end for the winding and how the positive and negative ends relate to each other. If you reverse the winding’s polarity or reconfigure the connections so that the reference end changes, the labeling must reflect that change, so the same physical bushing can correspond to opposite polarity in different configurations. The voltage level doesn’t determine the label—it's the direction of the winding’s reference that matters. A labeling scheme that stays fixed or ignores polarity would lead to misphasing and incorrect connections, which is why the labeling is tied to polarity and changes as polarity changes.