Three Phase Wiring

[dfitzger]

I have the following information for wiring an international three phase
unit;
Five wire-  4 conductors plus ground
         Line-  1 brown, 2 blacks
     Neutral - 1 light blue
     Ground - 1 green/yellow
Are these colors correct?
How do you differentiate between the two blacks?
Is there a standard that mandates colors for three phase wiring?
Thank you for any information.