S.C. Code Regs. § § 103-834
Any party of record to a proceeding may, by written request, ask the Commission or its designee for leave to take the testimony of any witness by deposition. The request shall set forth the facts the requesting party seeks to establish by the deposition. Such written request shall be filed with the Commission at least 10 days prior to the commencement of the scheduled hearing. The requesting party shall give notice by providing a copy of the written request to each party of record to the proceeding. If the Commission or its designee deems the request meritorious, it may issue an Order designating the individual whose deposition may be taken, specifying the subject matter of the examination, and setting forth the time and place of such deposition, and whether it shall be written or oral examination. All costs incidental thereto shall be paid by the party desiring such deposition. If the request is not deemed meritorious, the written request shall be denied by Order or otherwise.
S.C. Code Regs. § 103-834