Expecting that your Association is incorporated as a non-profit (most are),
South Carolina Nonprofit Corporation Act: SECTION 33-31-722. Quorum requirements.
(a) Unless this chapter, the articles, or bylaws provide for a higher or lower quorum, ten percent of the votes entitled to be cast on a matter must be represented at a meeting of members to constitute a quorum on that matter.
(b) A bylaw amendment to change the quorum for a member action may be approved by the members and, if required, be approved as provided in Section 33-31-1030.
(c) An amendment to the articles of incorporation or bylaws that adds, changes, or deletes a greater quorum must be adopted under the quorum then in effect or proposed to be adopted, whichever is greater.
My Association (a VA Association)has the following quorum requirement language:
"The presence at the meeting of members entitled to cast or of proxies entitled to cast, one-tenth (1/10) of the votes of the membership shall constitute a quorum for any action except as otherwise provided in the Articles of Incorporation, the Declaration or these Bylaws. If, however, such quorum shall not be present or represented at any meeting, the members entitled to vote thereat shall have power to adjourn the meeting from time-to-time without notice other than announcement at the meeting, until a quorum as aforesaid shall be present or represented."
Note: We do have a 60% quorum requirement to raise assessments above 5% or to adopt a special assessment. Here is that language:
"At the meeting called, as provided in Sections 3 and 4 hereof, the presence at the meeting of members or of proxies entitled to cast sixty (60) percent of all the votes shall constitute a quorum. If the required quorum is not forthcoming at any meeting, another meeting may be called, subject to the notice requirement set forth in Sections 3 and 4, and the required quorum at any such subsequent meeting shall be one half (1/2) of the required quorum at preceding meeting. No such subsequent meeting shall be held more than sixty (60) days following the preceding meeting."
Hope this helps,
Tim