Article 551.44 of the National Electrical Code allows only 1 power supply assembly feeding an RV at a time. There has to be a transfer switch for 2 feeds. The 30amp and the 50 amp feeds can't go to same RV.
That’s a bit of an unenforceable article. Code allows you to plug your RV into a 30-amp receptacle, and plug an electric skillet that’s sitting on the picnic table into the 20-amp receptacle. But once you move the skillet inside the RV and run the extension cord in through the doorway, then 551.44 applies.
Plus there’s a bunch of RV shops that will add a second air conditioner with a separate 15-amp plug to an RV with 30-amp shore power. That’s definitely a code violation, but I’ve seen dozens of these installations.
I have never seen a transfer switch for any pedestal in any RV park or campground between the 50-, 30-, and 20-amp receptacles. It seems the only way to enforce NEC, if adopted in a particular jurisdiction, is the pedestals would need transfer switches only allowing one pedestal connection to be used, the 50, the 30, or the 20, and the other two would need to be locked out from use. Interesting.
I saw a mechanical lockout that slides between the 30 or 50-amp receptacles so that only one power cord can be plugged in at a time. I’ll see if I can find a picture…
Article 551.44 of the National Electrical Code allows only 1 power supply assembly feeding an RV at a time. There has to be a transfer switch for 2 feeds. The 30amp and the 50 amp feeds can't go to same RV.
That’s a bit of an unenforceable article. Code allows you to plug your RV into a 30-amp receptacle, and plug an electric skillet that’s sitting on the picnic table into the 20-amp receptacle. But once you move the skillet inside the RV and run the extension cord in through the doorway, then 551.44 applies.
Plus there’s a bunch of RV shops that will add a second air conditioner with a separate 15-amp plug to an RV with 30-amp shore power. That’s definitely a code violation, but I’ve seen dozens of these installations.
I have never seen a transfer switch for any pedestal in any RV park or campground between the 50-, 30-, and 20-amp receptacles. It seems the only way to enforce NEC, if adopted in a particular jurisdiction, is the pedestals would need transfer switches only allowing one pedestal connection to be used, the 50, the 30, or the 20, and the other two would need to be locked out from use. Interesting.
I saw a mechanical lockout that slides between the 30 or 50-amp receptacles so that only one power cord can be plugged in at a time. I’ll see if I can find a picture…
https://woodallscm.com/rv-powergate-stops-use-of-multiple-pedestal-outlets/