I wouldn't set too much blame on the electrician. Most 30 amp circuits are used to power electric driers, hot tubs, welders and the like, most of which use 220v, not 110v AC. 30A 110 appliances are pretty rare.
As far as I know RVs, on the other hand, use 110v hookups.
wiring in your home isn't beyond the capabilities of a knowledgeable and experienced do-it-yourselfer. I'm no electrician, but I've installed everything from 220V 50-amp circuits to a hot tub on down to 110v 15-amp outlets and lights
, all done with building permits, inspections, and sign-offs.
When it comes to home electrical
wiring the key words in the last paragraph are "knowledgeable" and "experienced." Unless you have both and are willing and able to go through the electrical permitting process, I'd suggest calling in a professional to do the job. In this economy it should be easy to find a pros willing to take on a small job, too.
Working your way through the permit process is important in two ways. First, inspectors are doubly careful about inspecting a do-it-yourselfer electrical project, insisting that it be done in a competent, professional manner and likely catching any errors you may have made. Second, once the project is signed off you can take that permit paperwork to your insurance company or future home buyer if any questions come up about your work to prove it was done right.
Which brings us back to being knowledgeable and experienced. Building inspectors have little patience for people who don't know what they're doing.