N.C. Gen. Stat. § 90-210.22: Required meetings of the Board.

The Board shall hold at least four meetings in each year. In addition, the Board may meet as often as the proper and efficient discharge of its duties shall require. Five members shall constitute a quorum. (1901, c. 338, ss. 5, 6, 7, 8; Rev., s. 4387; C.S., s. 6780; 1949, c. 951, s. 3; 1957, c. 1240, s. 2; 1969, c. 584, s. 2; 1973, c. 476, s. 128; 1975, c. 571; 1991 (Reg. Sess., 1992), c. 901, s. 4; 2003-420, s. 4.)