When a borrower has outstanding any bonds issued under the provisions of this chapter, it may thereafter issue and negotiate new bonds on such terms as the governing body shall deem advisable for the purpose of providing for the payment of any such outstanding bonds. Such new bonds shall be designated "revenue refunding bonds" and shall be secured to the same extent and shall have the same source of payment as the bonds which have been thereby refunded.
S.C. Code § 6-21-380