The labeling of the secondary bushings changes based upon the __________

• A. Polarity
• B. Voltage level
• C. Current flow
• D. Altitude

Answer: (A)

Polarity is what determines how the secondary terminals are labeled. The ends of a winding have a defined polarity relative to a reference, so the terminal that is positive at a given moment is identified with a specific bushing. This labeling lets you connect windings in series or parallel with the correct phase relationship, so voltages add or subtract as intended and you don’t end up with opposite phasing or a fault. Voltage level, current flow, or altitude don’t determine how the bushings are labeled; it’s the winding’s polarity that does.