Which option represents a wye-connected secondary voltage?

• A. 120/240 1Ø
• B. 120/240 3Ø
• C. 120/208 3Ø
• D. 240/480 3Ø

Answer: (C)

In a wye-connected secondary, the three windings meet at a common neutral point, so you have a line-to-neutral voltage for each winding. The line-to-line voltage between any two phases is the phase voltage multiplied by sqrt(3). If the phase (line-to-neutral) voltage is 120 V, the line-to-line voltage becomes about 208 V (120 × 1.732 ≈ 208). This 120/208 configuration is the standard three-phase wye setup.

So the combination that shows 120 V to neutral and 208 V line-to-line represents a wye-connected secondary. The other options don’t fit because they imply either a single-phase arrangement, or line-to-line and phase voltages that don’t align with the sqrt(3) relationship of a wye, or correspond to delta connections where a neutral isn’t present.