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The NCAA Penetration rule is as follows:

15.2.4.1 Encroachment into the opponent's court with the foot, feet, or hand(s) is permitted, provided some part of the encroaching extremity remains in contact with or directly above the center line, and there is no interference with opponents. It is not a fault to contact the opponent's team court with the hair.
15.2.4.2 Encroachment into the opponent's court with any part(s) of the body is permitted, provided some part of the body remains either in contact with or directly above the center line, and there is no interference with opponents. In addition, completely crossing the center line with the foot, feet, or hands, or encroachment with other body parts must not present a safety hazard to opponents.
15.2.4.3 It is not a fault to cross the center line after the ball is out of play.
15.2.4.4 It is not a fault to cross the extension of the center line outside the boundaries of the court (see Rule 15.1.1.1) and enter the opponent's free zone, provided there is no interference with opponents.