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I would take a breath and buy a $4.99 polarity tester from any harware store or Home Depot:
http://www.wiebetech.com/images/prod...ity_Tester.jpg
One of your neigbors probably have one, 2 second test if the electrician knew what he was doing. Beyond that a DVM would confirm there is'nt some strange luner issue like in the movie "Frequency" causing crazy voltage swings :)
http://www.armitronpower.ca/images/tools11.jpg
Unlike automotive electronics there realy isnt any black magin in AC wireing, its very simple but people screw it up often.
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If he's licensed it's pretty easy to get him to lose it.
Electricity is pretty hard to fsck up.