If it did it would have been installed previously at the factory.
RV Roamer said:Ah Shayne, you have much greater faith in RV manufacturers than I do! :
I've seen a number of gas motorhomes built with 30A service but loaded with enough electrical gear to tax a 50A system. Two a/cs are pretty common; add to that a convection oven, electric water heater, big fridge, and a 50A converter and 30A isn't even close. Pace Arrow, for example, didn't even offer a 50A option on their MH in 2004, yet they build 'em up to 37 feet with 3 slides and all the trimmings of a high end DP. Go figure...
Karl said:Again from the existing junction box, run a 3-wire, 12ga. (hot, neutral, and ground) cable from the OTHER hot lead, the neutral, and the ground, to the new breaker box, connecting the hot lead to the 50A breaker, the neutral to the neutral bus bar, and the ground to the ground bus bar.
Yes, it is. Rated ampacity for 12ga. wire is 41 amps for chassis wiring. 10ga is o.k. for 55A chassis wiring.12 gauge wire is insufficient for 30 amp service. Suggest that you use a length of the existing supply cable that is already connected to the incoming supply box to run to the new 50 amp breaker box you install .
Karl said:Yes, it is. Rated ampacity for 12ga. wire is 41 amps for chassis wiring. 10ga is o.k. for 55A chassis wiring.
That may be true, even probably on the low side. If you use the 700 circular mils per amp rule for power transmission, a 12ga wire would only be rated for 9.32 amps - very, very conservative. Don't forget I suggested the new box be located very closeI believe that if you check you will find tha the cord going from the MH to the 30 amp Park service is, at a minimum, 10 gauge.
, and being in free air and not bundled or in HVAC ducting, the 700 rule does not apply. I agree that bigger is usually better, but we're talking about the difference between a .636 volt drop per 10' of 10ga. wire as opposed to a .932 voltage drop for the same length of 12ga. wire when loaded to [email protected] Hardly worth mentioning. Besides, 10ga. is a whole lot harder to work with.Somewhere very near there I would install a separate, new 50A/240V breaker panel