I had an electrician do it for me as well, as I wanted to make darn sure I followed electrical code. However I discovered that the master electrician who I have worked together with for many years and is very competent, had never wired this type of plug and I ended up knowing more about it than him.
Take a look at this article, it will give you the basics of what is needed for this setup, so you may be able to verify their work or talk to them about their work.
http://www.myrv.us/electric/pg/30amp_service.htm
A few thoughts for your situation (some are dumb but no harm in eliminating the obvious):
- do you see a 4th wire in the receptacle? That would indicate it is possibly 240v
- is the breaker in the house for it a double throw (looks like a double wide breaker with 2 switches attached by a bar)? That would indicate it is probably 240v
- which breaker tripped: one or more trailer breakers, the trailer main, the breaker in the house for the trailer, or the house main? That may help narrow down the situation
- do you know what your house fuse box is 50A or 100A?
- was there anything of significant running in the house at the time ie Stove, Dryer and your wife drying off a St Bernard with 4 hair dryers at once?
- have you ever plugged into a 30A campsite before to confirm it works
- if you have a volt meter look at the first pic in the above link of the receptacle in your garage. Plug the red lead of the volt meter into slot marked with black and the black lead into the white slot or the round slot marked with green. Either of these combo's will measure abt 120v, any other combo will not. If you get anything else let the electrician know. It is good to know how to do this as you should check the pedestal at every campground before you plug into shore power.
Rob
rvtechwithrvrob.com
