220. (1) The Chairman and other members of a Public Service Commission shall be appointed, in the case of the Commissions and staff of Federal Commission, by the President, and in the case of a Provincial Commission, by the Governor of the Province in his discretion:

Provided that at least one-half of the members of every Public Service Commission shall be persons who at the dates of their respective appointments have held office for at least ten years either under the Federation or under a Province and in computing the said period of ten years any period before the commencement of this Constitution during which a person has held office under the Crown shall be included.

(2) In the case of the Federal Commission, the President and, in the case of a Provincial Commission, the Governor of the Province in his discretion, may by regulations–

(a) determine the number of members of the Commission, their tenure of once and their conditions of service; and

(b) make provision with respect to the number of members of the staff of the Commission and their conditions of service.

(3) On ceasing to hold office–

(a) the Chairman of the Federal Commission shall be ineligible for further employment either under the Federation or under a Province;

(b) the Chairman of a Provincial Commission shall be eligible for appointment as the Chairman to a member of the Federal Commission or as the Chairman Of another Provincial Commission, but not for any other employment either under the Federation or under a Province;

(c) no other member of the Federal or any Provincial Commission shall be eligible for any other appointment either under the Federation or under a Province without the approval, in the case of an appointment in connection with the affairs of a Province, of the Governor of the Province and, in the case of any other appointment, of the President.