Is this a place served by "more than one nominal voltage system"?
If not, this does not apply.
*** Opinion bit on***
Even if it did, I would still use tape to give these conductors supplementary identification.
For example we could have 3p 480 indicated "BOY"
and the 3p 208 would be Bk,R,Bl
If I was running a switch loop on the black phase I would use black conductors and put a wrap of pink and purple tape on the travelers if that is your convention.
I think we are trying to convey more information identifying conductors, not less. You just have to stay away from green, gray and white on ungrounded conductors.
*** opinion off ***
This is still new to me. Florida is still on the 08 and unless they do something radical for them we won't get the 11 until March of 15
