Employment Law Questions? Ask an Employment Lawyer.
If you are salaried, it means that you are paid a fixed amount regardless of the hours worked.
The employer CANNOT convert you to salaried employee, but then treat you as an hourly employee. You must be paid a fixed amount for your pay period regardless of the hours that you work.
See Code of Federal Regulations Title 29 Subpart G Section 541.602:
The State of North Carolina has adopted the Section 541 of the Code of Federal Regulation.