New What Size Wire For 30 Amp Rv Service Background. Ultimate guide to rv wiring outlets plugs for all skill levels. This service is very simple to wire just follow the color coding for the connections if marked and use the correct size wire.
Piggy backing on another circuit, especially tapping 120v from a 240v circuit like this, just leaves too many possibilities for future problems and safety hazards.
You can use a bigger wire size to accommodate such distribution of electricity to. Due to the length of this run (120 feet.), to get a full 50a service at 120v, you would have to run #4 awg copper wire to stay within acceptable voltage drop (3%). Most rv owners ask this question since the majority of household equipment hold draw 30 amps. My father has a rv that requires 30 amp 120volt and i was going to run from an outdoor sub panel at the meter.