Bill, the province of Alberta and Western Area Power Administration {a federal bulk-power utility} use Red/Black/Blue for 208Y ‘ABC-123’ phasing
There are a number of institutional facilities that publish their “Division 16” (electrical) design standards online.
I learned Brown-Violet-Yellow {Gray} for 480Y/277V phasing in the 1970s.
ucdavis.edu wsu.edu ohio-state.edu and others list the “B-O-Y” 480V code for ‘ABC-123’ phasing.
stanford.edu lists 277/480V 3P 4W… normally Brown, Purple or Orange, Yellow, Gray or White, as does GE metering-retrofit instructions.
berkeley.edu {and sister facilities} list Brown, Yellow, Purple, and White for 480Y/277V systems, as does ci.brisbane.ca.us. Aside—“B-Y-P” in Berkeley evolved from their 1950s standard of Black-Yellow-Green(!) for 480V ∆ systems. Bare copper was the mandatory equipment-grounding conductor within all raceways and enclosures—metal or otherwise. [Green-jacketed grounding conductors are now permitted, but there is tons of existing gear with bare equpemnt grounds.]
The Omaha 480Y/277V utility network ABC-123 phasing is Brown, Orange and Purple in their standards.
Lithonia Lighting shows Yellow-Brown-Orange-White for 480Y/277V.
Last but not least, the City of San Francisco calls out Black-Violet-Blue for 240V 4W∆, to not conflict with the 480V B-O-Y code. Many others use Black-Orange-Blue for 240V 4W∆.
