S.C. Code Ann. § 14-3-370

Whenever, upon the hearing of any cause or question before the Supreme Court in the exercise of its original or appellate jurisdiction, (a) it shall appear to the justices thereof or any three of them that there is involved a question of constitutional law or of conflict between the Constitution and laws of this State and of the United States or between the duties and obligations of her citizens under the same, upon the determination of which the entire court is not agreed or (b) the justices of said court, or any two of them, desire it, the Chief Justice, or in his absence the presiding associate justice, shall call to the assistance of the Supreme Court all the judges of the circuit courts, except that when the matter to be submitted is involved in an appeal from a circuit court the circuit judge who tried the case shall not sit.