Do the revised requirements of 2017 NEC 210.8(B)(4) require RV Park single phase (120/240 vac) receptacles rated either 30 amps or 50 amps to have GFCI protection? The cited subsection [210.8(B)] now requires that for "Other Than Dwelling Units." "All single phase receptacles rated 150 volts to ground or less, 50 amps or less...installed in the following locations shall have ground fault circuit-interrupter protection for personnel". One of the "following locations" is sub subsection "(4) Outdoors)". I am unable to find anything in Article 551 Recreational Vehicles and Recreational Vehicle Parks that "supplement or modify" this requirement as provided for in Section 90.3 Code Arrangement. I have not yet tried contacting an RV Power Outlet manufacturer to see what their position is (perhaps the installation instructions address this question). Thanks for your feedback.