N.C. Gen. Stat. § 160B-14
In issuing its general obligation and revenue bonds, a consolidated city-county, except as expressly modified by this chapter, is subject to the provisions of Chapter 159 of the General Statutes of North Carolina.
If a proposed bond issue is required by law to be submitted to and approved by the voters of the consolidated government, and if the proceeds of the proposed bond issue are to be used in connection with a service, facility or function that is or, if the bond issue is approved, will be financed, provided or maintained only for one or more urban service districts, the proposed bond issue must be approved concurrently by a majority of those voting throughout the entire consolidated government and by a majority of the total of those voting in all the affected or to be affected urban service districts.
N.C. Gen. Stat. § 160B-14