N.C. Gen. Stat. § 87-57: License required of persons, firms or corporations engaged in the refrigeration trade.

In order to protect the public health, safety, morals, order and general welfare of the people of this State, all persons, firms or corporations, whether resident or nonresident of the State of North Carolina, before engaging in refrigeration business or contracting, as defined in this Article, shall first apply to the Board and shall procure a license. (1955, c. 912, s. 6.)