N.C. Gen. Stat. § 62-63
The chief clerk, a deputy clerk, or any authorized agent of the Commission may serve any notice issued by it and his return thereof shall be evidence of said service; and it shall be the duty of the sheriffs and all officers authorized by law to serve process issuing out of the superior courts, to serve any process, subpoenas and notices issued by the Commission, and such officers shall be entitled to the same fees as are prescribed by law for serving similar papers issuing from the superior court. Service of notice of all hearings, investigations and proceedings by the Commission may be made upon any person upon whom a summons may be served in accordance with the provisions governing civil actions in the superior courts of this State, and may be made personally by an authorized agent of the Commission or by mailing in a sealed envelope, registered, with postage prepaid, or by certified mail.
N.C. Gen. Stat. § 62-63