S.C. Code § 7-13-72
For the general election held on the first Tuesday following the first Monday in November in each even-numbered year, the members of the county board of voter registration and elections must appoint three managers of election for each polling place in the county for which they must respectively be appointed for each five hundred electors, or portion of each five hundred electors, registered to vote at the polling place.
For primary elections held on the second Tuesday in June of each general election year, the members of the county board of voter registration and elections must appoint three managers of election for each polling place in the county for which they must respectively be appointed for the first five hundred electors registered to vote in each precinct in the county, and may appoint three additional managers for each five hundred electors registered to vote in the precinct above the first five hundred electors, or portion thereof. The members of the county board of voter registration and elections must also appoint from among the managers a clerk for each polling place in the county, and none of the officers may be removed from office except for incompetence or misconduct. All clerks appointed from among the managers must be residents and registered electors of the respective counties in which they are appointed to work or in an adjoining county.
For all other primary, special, or municipal elections, the authority charged by law with conducting the primary, special, or municipal elections must appoint three managers of election for the first five hundred electors registered to vote in each precinct in the county, municipality, or other election district and one additional manager for each five hundred electors registered to vote in the precinct above the first five hundred electors. The authority responsible by law for conducting the election must also appoint from among the managers a clerk for each polling place in a primary, special, or municipal election. All clerks appointed from among the managers must be residents and registered electors of the respective counties in which they are appointed to work or in an adjoining county.
Forty-five days prior to any primary, except municipal primaries, each political party holding a primary may submit to the county board of voter registration and elections a list of prospective managers for each precinct. The county board of voter registration and elections must appoint at least one manager for each precinct from the list of names submitted by each political party holding a primary. However, the county board of voter registration and elections may refuse to appoint any prospective manager for good cause.
No person may be appointed as a manager in a primary, general, or special election who has not completed a training program approved by the State Election Commission concerning his duties and responsibilities as a poll manager and who has not received certification of having completed the training program. The training program and the issuance of certification must be carried out by the county board of voter registration and elections. After their appointment, the managers and clerks must take and subscribe, before any officer authorized to administer oaths, the following oath of office prescribed by Section 26 of Article III of the Constitution: "I do solemnly swear (or affirm) that I am duly qualified, according to the Constitution of this State, to exercise the duties of the office to which I have been appointed, and that I will, to the best of my ability, discharge the duties thereof, and preserve, protect and defend the Constitution of this State and of the United States. So help me God".
The oath must be immediately filed in the office of the clerk of court of common pleas of the county in which the managers and clerks are appointed, or if there is no clerk of court, in the office of the Secretary of State. Before opening the polls, the managers of election must take and subscribe the oath provided for in Section 7-13-100. Upon the completion of the canvassing of votes, this oath must be filed with the members of the county board of voter registration and elections along with the ballots from that election precinct.
S.C. Code § 7-13-72