S.C. Code Ann. § 33-31-1023: Bylaw increasing quorum or voting requirement for members.

(a) The members may adopt or amend a bylaw that fixes a greater quorum or voting requirement for the members, or any class of members, than is required by this chapter. The adoption or amendment of a bylaw that adds, changes, or deletes a greater quorum or voting requirement for members, if required, must be approved as provided in Section 33-31-1030 and must meet the same quorum requirement and be adopted by the same vote and class vote required to take action under the quorum and voting requirement then in effect or proposed to be adopted, whichever is greater.

(b) A bylaw that fixes a greater quorum or voting requirement for members under subsection (a) may not be adopted, amended, or repealed by the board of directors.