I had a job where we had VFDs right next to the 480V Service equipment so there was effectively no voltage drop.
The manufacturer had to make custom drives for us because the normal 460V rating wouldn't tolerate the actual line voltage.
Actually it had no problem with the voltage when it was 480...but when we started going above that (the Utility is allowed + or - 10%) the VFD started blowing boards.
I can't remember how many times they sent their standard 460V components before they realized that we actually knew what we were talking about when we specifically ordered 480V instead of their usual 460V stuff.
And no...we didn't pay them when they repeatedly sent us the wrong stuff and it blew up. GE now officially hates us.
