[Al Skierkiewicz]

Lior,
The FRC rules do not relate to motor current. They merely size the breaker rating to the wire it is being used with. The chart you link to is based on continuous duty in an enclosed chassis and is specified for the voltage drop across the wire. (This is actually a specification that is derived from aircraft needs.) At 100 amps, a #10 wire will drop 0.1 volt per foot while a #12 with the same current will drop almost twice that. Since the load would remain the same, the available current (at the motor) will decrease a small amount with the #12 wire.