S.C. Code § 5-19-10
The city or town council of any city or town adopting the commission form of government, except a municipality of over two thousand and less than four thousand inhabitants, shall immediately after the organization of the new city council first elected after adoption of such form of government by ordinance appoint three civil service commissioners, who shall hold office for two, four and six years, the successors of each to be thereafter appointed for the term of six years at the expiration of the preceding term of service. Such commissioners shall be removable from office by council only for cause, four councilmen voting for such removal. Council shall have authority to fill any vacancy for the unexpired term. Each such commissioner shall before entering upon his duties take and subscribe the oaths required of councilmen by law.
S.C. Code § 5-19-10