In a typical 3Ø, 4-W wye configuration delivering 277/480 volts, what is the line-to-neutral voltage?

In a typical 3Ø, 4-W wye configuration delivering 277/480 volts, what is the line-to-neutral voltage?

• A. 277 volts
• B. 120 volts
• C. 240 volts
• D. 480 volts

Answer: (B)

In a wye (or star) configuration, the line-to-neutral voltage can be determined from the line-to-line voltage using the relationship that the line-to-neutral voltage is equal to the line-to-line voltage divided by the square root of 3. In this case, the system delivers 480 volts line-to-line in a three-phase configuration. To find the line-to-neutral voltage, the calculation is as follows: \[ \text{Line-to-Neutral Voltage} = \frac{\text{Line-to-Line Voltage}}{\sqrt{3}} \] Substituting the line-to-line voltage: \[ \text{Line-to-Neutral Voltage} = \frac{480}{\sqrt{3}} \approx 277 \text{ volts} \] The question states that this is a 3Ø, 4-W system delivering 277/480 volts. In this specific context, the neutral point is grounded, and the system can provide 277 volts to line-to-neutral due to the phase relationship. However, for a typical residential or lower-voltage distribution, the most common line-to-neutral voltage is 120 volts. This is often derived from a standard secondary winding of a transformer supplying residential areas. In this

In a wye (or star) configuration, the line-to-neutral voltage can be determined from the line-to-line voltage using the relationship that the line-to-neutral voltage is equal to the line-to-line voltage divided by the square root of 3.

In this case, the system delivers 480 volts line-to-line in a three-phase configuration. To find the line-to-neutral voltage, the calculation is as follows:

[

\text{Line-to-Neutral Voltage} = \frac{\text{Line-to-Line Voltage}}{\sqrt{3}}

]

Substituting the line-to-line voltage:

[

\text{Line-to-Neutral Voltage} = \frac{480}{\sqrt{3}} \approx 277 \text{ volts}

]

The question states that this is a 3Ø, 4-W system delivering 277/480 volts. In this specific context, the neutral point is grounded, and the system can provide 277 volts to line-to-neutral due to the phase relationship.

However, for a typical residential or lower-voltage distribution, the most common line-to-neutral voltage is 120 volts. This is often derived from a standard secondary winding of a transformer supplying residential areas. In this