N.C. Gen. Stat. § 153A-308
A county may issue its general obligation bonds under the Local Government Bond Act to finance services, facilities, or functions provided within a service district. If a proposed bond issue is required by law to be submitted to and approved by the voters of the county, and if the proceeds of the proposed bond issue are to be used in connection with a service that is or, if the bond issue is approved, will be provided only for one or more service districts or at a higher level in service districts than countywide, the proposed bond issue must be approved concurrently by a majority of those voting throughout the entire county and by a majority of the total of those voting in all of the affected or to-be-affected service districts.
N.C. Gen. Stat. § 153A-308