5 CFR part 6, Exceptions From the Competitive Service (Rule VI) provides extensive information about the authority to except positions from the competitive civil service, including definitions of the types of positions granted under Schedules A, B, and C. This rule also requires OPM to publish notice of all exceptions granted under Schedules A, B, and C.
5 CFR part 213 (January 1, 2004). OPM lists its excepted hiring authorities that apply Governmentwide in title 5, Code of Federal Regulations, under part 213. See Schedule A and Schedule B.