5 C.F.R. § 6.2 Schedules of excepted positions.
Title 5 - Administrative Personnel
Title 5: Administrative Personnel
PART 6—EXCEPTIONS FROM THE COMPETITIVE SERVICE (RULE VI)
§ 6.2 Schedules of excepted positions.
OPM shall list positions that it excepts from the competitive service in Schedules A, B, and C, which schedules shall constitute parts of this rule, as follows:
Schedule A. Positions other than those of a confidential or policy-determining character for which it is not practicable to examine shall be listed in Schedule A. Schedule B. Positions other than those of a confidential or policy-determining character for which it is not practicable to hold a competitive examination shall be listed in Schedule B. Appointments to these positions shall be subject to such noncompetitive examination as may be prescribed by OPM. Schedule C. Positions of a confidential or policy-determining character shall be listed in Schedule C.

