In Scenario 230.26, what is the motor nameplate voltage and phase?

• A. 208-V 1Ø
• B. 208-V 3Ø
• C. 120-V 1Ø
• D. 240-V 3Ø

Answer: (A)

The key idea is reading the motor’s rating and matching it to the supply type in the scenario. In a 120/208 V system, the voltage between any two hot lines is 208 V. If the load is a single-phase motor connected across two lines, the motor must be rated for 208 V in a single-phase configuration. That’s why the correct match is 208 V single-phase—the motor nameplate would show 208 V 1Ø to indicate it operates on a single-phase 208‑volt supply.

Why the other possibilities don’t fit here: a three-phase rating would imply a motor designed for a three-wire, three-phase connection, which isn’t used when the circuit is described as single-phase. A 120 V rating would be too low for a motor intended to run on 208 V, and a 240 V three-phase rating would require a 240 V three-phase supply, not the 208 V single-phase supply implied in the scenario.