S.C. Code § 13-1-1040
Notwithstanding any other provision of law, legislators residing in the congressional district shall meet upon written call of a majority of the members of the delegation of each district at a time and place to be designated in the call for the purpose of electing a commissioner to represent the district. A majority present, either in person or by written proxy, of the delegation from a given congressional district constitutes a quorum for the purpose of electing a district commissioner. No person may be elected commissioner who fails to receive a majority vote of the members of the delegation.
The delegation must be organized by the election of a chairman and a secretary, and the delegations of each congressional district shall adopt rules they consider proper to govern the election. Any absentee may vote by written proxy. When the election is completed, the chairman and the secretary of the delegation shall immediately transmit the name of the person elected to the Secretary of State who shall issue to the person after he has taken the usual oath of office, a certificate of election as commissioner. The Governor then shall issue a commission to the person, and pending the issuance of the commission, the certificate of election is sufficient warrant to the person to perform all of the duties and functions of his office as commissioner. Each commissioner shall serve until his successor is elected and qualified.
S.C. Code § 13-1-1040