50Amp-30/15Y adapter

[Dwayne61]

Hi all. Just wondering if anyone had a link or something to a 50ampfemale to 30amp and 15amp Y adapter. I saw one somewhere but didn’t log it.

 

[Dahillbilly]

available at several locations, Amazon, Wal-mart, majority of RV dealerships. 50 to 30 dogbone & a 30amp/110volt 15 amp

 

[TrailCreek]

Get a few different ones to have flexibility. 50 to 30 and 30 to a Y 110 20amp. Go both ways and you cover everything you need to use any source. Walmart has the best prices. Buy online.

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[Dwayne61]

Thanks for the replies all. I guess I wasn’t clear enough. I am looking for a specific Y that has 50 amp female on one end and has 30 amp male and a 15/20 amp male on the other 2 supply legs. It’s for those times a site doesn’t have 50 available but has both 30 and 20.

 

[TrailCreek]

I wonder if having two legs or one leg of 220 feeding the RV would be a problem. I would be concerned if you have a 220 volt transfer switch and get both feeds from the same leg. In the service panel. Same concern if you have a dual phase inverter. It's not likely that you would get one leg feeding both 30 amp and 20 amp breakers, but some parks have some sketchy hookups.

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[NYSUPstater]

Not that I've ever had the need for this type of "Y" connector as I've always had adapters to allow us to hook up our 50 amp plug to whatever is avail at source and just adapt as to what we can run in the coach.

 

[TrailCreek]

I get it when you have two AC units and a microwave, a coffee maker, and a dryer. We have 3 rooftop AC units (2 are heat pumps) and all of the above so 30 amps is not enough. Not too bad overnight, but long term it could cause issues. Having a dual phase 3000 watt inverter with 600 amps of LI batteries let's us use 30 amps and most of our appliances but not all or long term. I did this search on Amazon and it came up. 15 amp and 30 amp to 50 amp adapter.

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[taskswap]

Please do not try to do this. The reason you cannot find something like this in Walmart or on Amazon is if you cross-connect a 30A outlet to a 20A past the breakers, you do not "get" 50A. Even somebody did make a product like this, current would try to flow relatively equally from both outlets and you will just repeatedly trip the 15/20A's breaker by trying to draw 25A from it. More probably, you'd do something like drawing 42A which would work out to 21A per leg and still trip the smaller breaker, but cause it to run hot for awhile first, which isn't good for their lifetime.

The reason is that per Kirchhoff's Law, if you run X amps through a wire, if you now parallel that with a second wire, X/2 amps will now flow through both. It doesn't matter if there are breakers on those wires or not. Breakers don't SET current, they LIMIT it. It's still your device (AC, etc) that determines what the draw ends up being. So it won't help, and can lead to early breaker failure for the campground.

I tried to post a diagram but I get errors from the site when I add an attachment, sorry.

What TrailCreek said above is also true. My rant above is the best case. In the worst case, the 30A and 20A breakers are fed from opposite legs in the main breaker panel (sometimes, but erroneously, called "phases.") If that happens and you tie them together you're essentially shorting the main breaker for the campground! If you're lucky it will trip immediately, but it's going to be an exciting half-second before it does...