Hey Marc- How does 277v. change anything??
A three way 20 amp Heveyduty toggle switch useally get pretty close to confortable only twice I got little careless with screws it shorted out when I engerized it.
That something you have to remember it once it did happend.
Single pole verison not too bad most case if you are smart enough to know which side you can screw in the box to the stud.
If the screws are on the left side you are fine with it but on right side that where the issue will raise a bit espcally with shallow mudrings deep mud ring it don't happend at all so far.