Ive got a 480 feed to a 480/208-120 transformer. It's fed off a 200 amp existing 480 brkr. Out of the transformer I'm feeding a 120/208 panel with a 400 amp main breaker. The 480 breaker is located about 225 ft away from the transformer but yet within sight of. It's a warehouse. My question is do I need to put in a 300 amp over current protection on the secondary side of the transformer? We are on the '08 code if that makes a difference.