Bob, Would a circuit going to a RV receptacle be considered a branch circuit (by definition). I think it may be a tough sell. Most RV's have OCPD's within, so the branch circuit would probably be from the OPCD in the RV to the outlet(s) within. But I can see where it could be gray, since before you plug in the RV, the circuit serving the 30A recept would be the branch circuit, then when you plug in the RV, it becomes a feeder (presto ).
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