#### jrsparkdog

##### Member

- Location
- Buffalo, NY, USA

I have a 120 V / 30 A, LED sign that i need to run power to. It is located 350 feet from the panel.

My calculations tell me that I need to run 1 AWG to that sign, for proper voltage drop.

Vd = (2 x K x D x I) / CM

Just to me that seems outrageous! Myself and fellow electricians I'ved worked with say the same thing. We believe that it should be more like 6 or 4 AWG. But my calculation says differently?

Am I doing something wrong with my calculation?

Any help is greatly appreciated and if I left anything out just ask.