N.C. Gen. Stat. § 143-139.3: Inspection of liquified petroleum gas piping systems for residential structures.

If the test required under the North Carolina State Building Code for a liquified petroleum gas piping system serving a one or two-family residential dwelling is not performed by a qualified code enforcement official, as defined in G.S. 143-151.8(a)(5), the contractor who installed the system shall verify that the system complies with the test requirements and shall certify the results, in writing, to the code official. (1993, c. 356, s. 3.)