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Old 07-03-2013, 08:08 AM   #15
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Originally Posted by FLYING BUTCH View Post
I have a splitter that I can run a 30 amp outlet into my 50 amp coach cord. This will only run one of mu three air conditioners. There is another 30 amp outlet available. Can't I run that into the other side of my splitter and then have power for my other air conditioners? I think I remember at one of the classes at a rally that 50 amp is really just two 30 amps. Or did I misunderstand. Appreciate any advise.

Safe travels everyone
Last week we had friends using our coach as a guest house for 4 days/nights.
I used a homemade adapter to connect 2 12ga cords, (one each from two different "out of phase" 20a receptacles), to my 50A cord.
That resulted in only 40A total, which was enough to run both roof airs and the inverter but little else, (no refer, WH, microwave, coffee maker, hair dryer, etc).

A 50A campground receptacle usually/normally provides 50A for each leg, (100a total).
However I have found some COE parks with labels on the power boxes stating that the 50A receptacles are protected by 30A breakers...in that case only 60A, (30 X 2), is available.
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Old 07-03-2013, 08:08 AM   #16
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The campground may be supplied with 3 phase service, but only one phase is used to provide the 120/240VAC split phase service being discussed. That's why it's called "split phase" service - it's splitting one primary phase into two hot outputs plus a neutral. That one primary phase powers the primary side (not shown) of the center tap transformer shown in the split phase diagram referenced above. This is no different than the split phase service provided to most homes in the U.S. The other two phases can be used on other rows to provide the split phase service for each row. So, yes, three phases may be provided to the campground, but these phases are hopefully divided up so that each phase is used to power the center-tap neutral transformers for a group of campsites.

If you'll look at the split phase diagram again, it's obvious why the two hot legs of the center tap neutral transformer secondary are 180 degrees out of phase with each other. When the alternating current is traveling from top to bottom of the secondary winding of the transformer, it's traveling from L1 to N and from N to L2 (i.e., 180 degrees out of phase); the opposite occurs when it's traveling from bottom to top.

My RV has a sticker on it that explicitly states "This connection is for 120/240VAC 50 amp split phase service ONLY."


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Old 07-03-2013, 09:47 AM   #17
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Well I am done for today.... I learned something new.
I was unaware they wired it that way.
Thank you for the lesson.

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