I hear you Peter but perhaps cpalm1 is from outside the US judging from his post.
Here are the 'Standard' voltages.
120, 120/240, 208Y/120, 240, 347, 480Y/277, 480, 600Y/347, and 600 volts shall be used.
208. 240, 480, and 600 are all line to line voltages.
I have only run into 347 once, and that was feeder for some sound equipment strangely enough.