RV Outlet NEC Code Question

rjniles wrote:
Article 551 has been discussed in a few of theses posts.

A minimum of two RV spaces are required to use Article 551 for site wiring.

The feeder to the RV panel is required to be sized for the expected loads. That doesn't necessarily mean a full 50 amps, but it doesn't necessarily mean 30 amps is sufficient either. What is the actual load of the RV and what is the actual load of the equipment you wish to connect to the 20 amp receptacle?

By installing the new RV panel you are changing this circuit from a branch circuit to a feeder. That means you will need to install two ground rods at the new panel. That's the impact not using Article 551 has on you. 551 does not require ground rods, but not using 551 requires them to be added.

Sorry, but the fact that 551 defines an RV park as having two or more sites for the temporary use of RVs does not mean that an inspector has to ignore the means, methods, and materials used to distribute power to an RV distribution box, or the code requirements of doing so. Nor would he, or she, necessarily default to the installation being a residential sub-panel. That is WAY too much supposition on your part. Second, asking what the load is on the OP's particular RV makes it clear that you are reading a section with little understanding of what you are looking at. The minimum branch circuit for a combined 30/20 120V pedestal is 3600VA, or a thirty amp breaker, the demand factor is 100%. Demand calculations are not required as it is spelled out clearly in the section. It's obviously a decision to be made by the individual AHJ, but I serious doubt that you would ever hear, "this jurisdiction is deciding to ignore the code section that clearly delineates how to wire an RV supply pedestal, since technically you aren't installing two of them" Do you even know if a typical pedestal is listed and labeled as a sub-panel?