Voltage Drop percentage - percentage of sending/source voltage (Shorebrook Question 49)

[akyip]

Hey guys,

Typically when solving for voltage drop percentage, it is as a percentage of sending or source voltage, correct?

Is the voltage drop solution for this problem incorrect? The solution uses receiving-end voltage Vr in the denominator... I always thought it was sending-end voltage in the denominator for voltage-drop percentage.

Thanks for any help or input on this!

 

[Orchid PE]

I can't seem to find a good reference that has % voltage drop.

 

[Zach Stone P.E.]

This is incorrect. Voltage drop percent by definition in the ratio of the amount dropped across the conductor to the amount supplied by the source. 

 

[Zach Stone P.E.]

I can't seem to find a good reference that has % voltage drop.

The NEC handbook edition gives some good examples using the magnitude approximation method only (by subtracting magnitudes instead of complex numbers).