S.C. Code Ann. § 36-5-116 – Transfer and assignment

(1) The right to draw under a credit can be transferred or assigned only when the credit is expressly designated as transferable or assignable.
(2) Even though the credit specifically states that it is nontransferable or nonassignable the beneficiary may before performance of the conditions of the credit assign his right to proceeds. The assignment is an assignment of an account under Chapter 9 on Secured Transactions and is governed by that chapter except that:
1. (a) the assignment is ineffective until the letter of credit or advice of credit is delivered to the designee which delivery constitutes perfection of the security interest under Chapter 9; and
2. (b) the issuer may honor drafts or demands for payment drawn under the credit until it receives a notification of the assignment signed by the beneficiary which reasonably identifies the credit involved in the assignment and contains a request to pay the assignee; and
3. (c) after what reasonably appears to be a notification has been received the issuer may without dishonor refuse to accept or pay even to a person otherwise entitled to honor until the letter of credit or advice of credit is exhibited to the issuer.
(3) Except where the beneficiary has effectively assigned his right to draw or his right to proceeds, nothing in this section limits his right to transfer or negotiate drafts or demands drawn under the credit.