What size wire.
The distance from my main electrical box to where I want to install a 30 amp receptacle is approximately 30 feet. What size wire should I pull for my RV plug? I also have a 27' shore line on the RV ...
Forum Discussion
joebedford wrote:
I know each leg of a 50A circuit is 120V but the voltage between them is 240V. So what do you put for voltage in this calculator? I'm guessing 120V. Makes a difference between 6ga and 4ga.
The only difference it makes is in the percent voltage drop; the absolute voltage drop is determined by ohm's law, and so depends only on the current and resistance (which, in turn, is determined by the wire size and length).
120V would seem to me to be most applicable to a 50A RV circuit, or indeed more generally to a 120/240V split phase circuit of any sort. 240V would, of course, be used for a "pure" 240V device like a welder or large air compressor.
