Originally Posted by Batts-toy
I almost did that on my first go round with 30 amp service, I went to the RV dealer and asked for a 220 volt adapter to my 30 amp plug, the young lady at the sales counter straightened me out in a quick minute. This (couldn't have been more than 20 years old) young lady fully explained the how TT circuits worked so went to Home Depot and got the parts and installed a 30 amp wall plug in my garage. She saved me from a lot of misery and expense.
We've had several members do that, and use an adapter to plug into a 240 volt 30 amp outlet. This causes 240 volts to go up both lines of the RV and fries the usual three things......converter, television, and microwave.
A lot of fellow RV'ers don't know (and I didn't either originally), that even though you are hooking up to a split phase 120/240 volt service, that the RV utilizes each line only as 120 volts and doesn't combine them which then has 240 volts.........so you are never ever using 240 volts. The RV only use 120 volts. They (and even electricians) see the big plugs and automatically incorrectly assume it needs 240 volts.
It just seems strange that this didn't happen immediately though to the OP, and it gave up the ghost later, but we did have another member who the same thing happened. She used it for part of an evening with A/C before the converter fried. She had an electrician incorrectly wire her outlet 240 volt on a 30 amp.
That's why I'm also curious to see of there is something else messed up.