Recently got involved with a new account, one of the first projects was going to require a new 480 volt 400 amp bucket in their service gear.
We quickly found the 1200 amp service gear was indeed running at 480 but all the Westinghouse Tags say 208Y/120. It's been that way 20+ years.
It appears it may
be just mislabeled as it uses 600 volt fuses. The PM is researching it.