Q. According to 110.14(C) of the 2002 NEC, what would the maximum allowable ampacity be for a 250 kcmil THHN conductor that feeds a piece of equipment protected by a 250A inverse-time circuit breaker ...

The NEC doesn't list a requirement that there be a maximum distance between junction or pull points. However, it does stipulate there shall not be more than 360° of total bends between raceway ...