S.C. Code § 34-21-300
If the instrument under which the trust institution acts as fiduciary, whether such fiduciary capacity arose before or is created after this article takes effect, shall authorize investments of moneys of the estate in a common trust fund or in investments other than those designated by law as legal investments, or shall authorize the trust institution, either alone or in conjunction with any person acting with it in a fiduciary capacity, to exercise its or their discretion with respect to the investment of moneys of the estate, the trust institution may, in its capacity as sole fiduciary or with the consent of any person acting with it in a fiduciary capacity, invest and reinvest moneys, of the estate in any such common trust fund maintained by it. Any such common trust fund consisting solely of moneys of estates contributed thereto by the trust institution pursuant to authority contained in any such instruments creating the fiduciary capacity to invest moneys of the estates in a common trust fund, or in investments other than such legal investments, or pursuant to such discretionary powers with respect to the investment of moneys creating the fiduciary capacity, may be composed of investments other than those of the class designated by law as legal investments for funds held by fiduciaries.
S.C. Code § 34-21-300