Originally Posted by jamesrxx951
The main was not shut off and the generator feed is wired to the transfer switch. Just plug and play.
Then you lucked out and had a transfer switch that sensed the over voltage or an electrician who screwed up in the first place. I'm trying to figure out how he wired a 4 wire (3 + safety gnd) to a 3 wire (2 + safety gnd) connector. Leaving off the neutral would not do it as that is how one gets 240 V for things like Hot Tub heaters.
What might have saved you is that a lot of the newer electronics are rated for 110-240 VAC into the switching power supply they use. Easier than making two supplies for various countries. OTOH I would not depend on that in all cases and bet against it for things like heaters.