S.C. Code § 4-29-110
Any bonds issued hereunder and at any time outstanding may at any time and from time to time be refunded by a county or incorporated municipality, but only with the approval of the State Fiscal Accountability Authority being first obtained, by the issuance of its refunding bonds in such amount as the governing board may deem necessary but not exceeding an amount sufficient to refund the principal of the bonds to be refunded, together with any unpaid interest thereon and any premiums, expenses and commissions necessary to be paid in connection therewith. Any such refunding may be effected whether the bonds to be refunded have matured or shall thereafter mature, either by sale of the refunding bonds and the application of the proceeds for the payment of the bonds to be refunded, or by exchange of the refunding bonds for the bonds to be refunded thereby; provided, that the holders of any bonds to be refunded shall not be compelled without their consent to surrender their bonds for payment or exchange prior to the date on which they are payable, or, if they are called for redemption, prior to the date on which they are by their terms subject to redemption. All refunding bonds issued under the authority of this chapter shall be payable in the same manner and under the same terms and conditions as are herein provided for the issuance of bonds. In addition to the powers herein granted for the issuance of refunding bonds the county boards may avail themselves of the provisions of Sections 11-21-10 to 11-21-80 (the Advanced Refunding Act).
S.C. Code § 4-29-110