So i have a 600amp/480v MDP i told my boss that he needs to put a OCPD (currently it only has main lugs) in the panel as 408.36 now he said that it doesnt need one because the main service disconnect by the service transformer serves as a disconnecting means. the service transformer with the main service disconnect will be about 400 ft away from our power rack with the MDP. is there exception to this rule,, is he right?