S.C. Code Ann. § 5-31-1930

The limitations imposed by SECTION 5-31-1910 shall not apply to cities having a population of over fifty thousand and not more than sixty thousand as shown by United States Government census of 1950. Such cities may contract as set forth in said section with persons or other cities or towns, public service commissions or other political subdivisions without the corporate limits of the city, whether contiguous to the corporate limits or not, and may contract for a period not exceeding twenty-five years.