S.C. Const. art. VII, § 10
The General Assembly may provide for the consolidation of two or more existing Counties if a majority of the qualified electors of such Counties voting at an election held for that purpose shall vote separately therefor, but such election shall not be held oftener than once in four years in the same Counties.
This section should be read in conjunction with Section 4 of Article VIII, which provides for the merger of adjoining counties, and with Section 5 of Article VIII, which provides for the merger of a part or parts of a county with one or more adjoining counties.