S.C. Code Ann. § 33-7-260: Action by single and multiple voting groups.

(a) If the articles of incorporation or Chapters 1 through 20 of this Title provides for voting by a single voting group on a matter, action on that matter is taken when voted upon by that voting group as provided in Section 33-7-250.

(b) If the articles of incorporation or Chapters 1 through 20 of this Title provides for voting by two or more voting groups on a matter, action on that matter is taken only when voted upon by each of those voting groups counted separately as provided in Section 33-7-250. Action may be taken by one voting group on a matter even though no action is taken by another voting group entitled to vote on the matter.