installing 30 amp outlet

Look at your breaker he installed. Is it a single or double throw 30 amp? If double he wired 220 and you have a problem.

I was only running about 10 feet of wire, so for the price difference, I had them wire a 240v 50 amp and I use my 50 to 30 pigtail adapter.
If I get a bigger trailer, motorhome, or want to run a welder etc. it's already set up

there was a post either on this forum or the keystone forum about how not to trust the electric ans to install 30 amp 120V. they always think you need 240 volts not 120.

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.

Is the new outlet on a dedicated circuit?
Single or double 30 amp breaker?

Otherwise unplug and check the outlet voltage. s/b 120 volts.

http://www.myrv.us/electric/Pg/30amp_Service.htm

Fourth reply, also thinking that the first one wired it to 220 volts and the second one did not get a volt meter out and check.

I would replace both if that is the case. Both of them should have been checking the voltage at a outlet with a METER to measure the voltage. If you find 220 volts, then the first one should have to pay for the new (and probably failed) microwave, TV, converter, air conditioner, and whatever else is not working now.. .

Good luck!

Fred.

Ill bet its wired 220. Non RV savvy electricians have done that many times. Hope your home insurance pays.

donn0128 wrote:
Did the first electrician wire it 30 amps 240 volts by mistake?

That's my best guess. Stand by to replace every electrical device in your trailer.

I would NEVER trust an electrician to wire up a 30 or 50 amp RV service drop without checking behind 'em (before they leave) to make sure it is wired 120 volts, and with the proper polarity.

Actually, I'd wire the flippin' thing myself in the first place, but that's another story.

Did the first electrician wire it 30 amps 240 volts by mistake?