Before any piece of election equipment can be used in North Carolina elections, it must be certified by the N.C. State Board of Elections. Among other goals, this ensures that voting systems remain reliable, accurate, user-friendly, accessible to persons with disabilities, and capable of secure operation. To that end, the NCSBE administers a certification program for any election systems vendor looking to do business in North Carolina. From this page, you can see the documentation for systems that have been approved by the Board for use in North Carolina, or those that are pending potential approval.
If you wish to view the complete certification procedures, you can find it here. The most recent version of the Elections Systems Certification Program was officially adopted for use by the North Carolina State Board of Elections on January 31, 2017.