[Al Skierkiewicz]

Joe,

<R48> All active Power Distribution Board branch circuit wiring with a constant polarity (i.e., except for relay module, speed controller, or sensor outputs) shall be color-coded as follows:
A. Use red, white, brown, or black with stripe wire for +24 Vdc, +12 Vdc and +5 Vdc connections.
B. Use black or blue wire for common (-) connections.

You can use any color you choose for the output side. Red and black can get confusing if you change the motor polarity at the output of the controller. Still red and black wiring keeps you from having to buy additional colors.