N.C. Gen. Stat. § 87-25
Any person, firm or corporation who shall engage in or offer to engage in, or carry on the business of plumbing, heating, or fire sprinkler contracting, or any combination thereof, as defined in G.S. 87-21, without first having been licensed to engage in such business, or businesses, as required by the provisions of this Article; or any person, firm or corporation holding a limited plumbing or heating license under the provisions of this Article who shall practice or offer to practice or carry on any type of plumbing or heating contracting not authorized by said limited license; or any person, firm or corporation who shall give false or forged evidence of any kind to the Board, or any member thereof, in obtaining a license, or who shall falsely impersonate any other practitioner of like or different name, or who shall use an expired or revoked license, or who shall violate any of the provisions of this Article, shall be guilty of a Class 2 misdemeanor. An employee in the course of his work as a bona fide employee of a licensee of the Board shall not be construed to have engaged in the business of plumbing, heating, or fire sprinkler contracting, as the case may be.
N.C. Gen. Stat. § 87-25