I'm confused by a couple of online calculators I've found.
I'm trying to determine the proper gauge wire to carry 20A, 120VAC over a distance of 300 ft. with an approx allowable 2% (per NEC) voltage drop. This UF cable will be buried for most of it's length.
This calculator:
However, this calculator seems much more conservative:
Also would like some real world advice on the voltage drop recommendations of the NEC. At what point does one see excessive/dangerous wire heating?
2% ? 5% ? 10% ? 20% ?-- Paul