NCEES Question #529

[MDElec]

On NCEES question #529, can anybody help me understand why the 480V is being divided by sqrt(3) in the solution? I understand they are subtracting the Voltage Drop from the panel voltage, but I can't figure out why the voltage is being divided by sqrt(3). I would really appreciate any help with this.

Thanks in advance!

 

[Flyer_PE]

The panel voltage is 480 V line-to-line. For the voltage drop calculation, you need the line-neutral voltage. (277 Volts for a 480 wye system)

VL-N=VL-L/sqrt(3)

 

[MDElec]

The panel voltage is 480 V line-to-line. For the voltage drop calculation, you need the line-neutral voltage. (277 Volts for a 480 wye system)
VL-N=VL-L/sqrt(3)

Ok, dumbest question of the year...

277V - Line-to-Neutral Voltage

480V - Line-to-Line Voltage

831V - ?

831 = 480V * sqrt(3)

Thanks for the help by the way.