Does NFHS not have the unintentional interference when in contact with the base protection? I can't find anything.
OBR Rule 6.01(a) Penalty for Interference Comment: A runner who is adjudged to have hindered a fielder who is attempting to make a play on a batted ball is out whether it was intentional or not. If, however, the runner has contact with a legally occupied base when he hinders the fielder, he shall not be called out unless, in the umpire’s judgment, such hindrance, whether it occurs on fair or foul territory, is intentional