Question on wire size for 30a
I need to install a 30a RV outlet on the side of our house for our trailer. I need to go about 60 feet from the panel. Would 10/2 Romex be sufficient, or should I go bigger?
Forum Discussion
NinerBikes wrote:
For runs under 50 feet, 10 gauge wire may be rated for a 30 amp load, but for continuous load, it is derated to 80% of it's value, or 24 amps. This is important to factor in if you ever decide to plug in an Electric car with an EVSE to recharge the car... your circuit is only rated 24 amps. You might want to think about future proofing your installation.
This does not apply to RV pedestals. NEC article 551.73(D) states "feeder-circuit conductors shall have an ampacity not less than the loads supplied and shall be rated not less than 30 amperes." Your RV was built with a #10 supply cord and meets the NEC, no reason a pedestal must have larger wire unless for voltage drop.
60 feet of #10 at 30 amps will drop 3.0-3.5% (3.5-4.0 volts).
