Yeah, I'm not sure.  I have special cables ordered so I can put them all on the 208v just to be safe. 

They have August, August, and June 2017 stickers on them if that means anything.  The power is very steady at 117.2v and the Kill-A-Watt I have says the PF is .99 and Hz are 59.99.  There is really no fluctuation in the readings.  Maybe it's because the power is so consistent?