S.C. Code Ann. § 34-21-290

If the instrument under which a trust institution acts as fiduciary, whether such fiduciary capacity arose before or is created after this article takes effect, shall either expressly or by its silence limit or restrict the investment of moneys of the estate and securities to the class authorized by law as legal investments, 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 the trust institution if the securities composing such fund consist solely of securities of the class authorized as legal investments for funds held by a fiduciary.