N.C. Gen. Stat. § 159-195
The duty of a governmental unit to make the payments required and to perform the other duties of the governmental unit under a swap agreement shall constitute a continuing contractual obligation of the governmental unit, enforceable in accordance with applicable law for the enforcement of contractual obligations of that governmental unit. A governmental unit may limit its duties under a swap agreement to designated property or a designated source of revenues or receipts of the governmental unit, such as the revenues of a specified utility or other public service enterprise system of the governmental unit. If a governmental unit enters into a swap agreement in connection with obligations that are secured by a designated form of security, then, subject to the terms of the bond order or resolution, trust indenture or trust agreement, installment contract or lease purchase agreement, or similar instrument pursuant to which the obligations are issued or incurred, the governmental unit may pledge, mortgage, or grant a security interest in the revenues of the utility or other public service enterprise system, program, receipts, property, or similar arrangement securing the obligations to secure the payment and performance of its duties under the swap agreement. Any pledge of assets, revenues, or receipts to secure the duties of a governmental unit under a swap agreement shall become effective in the same manner and to the same extent as a pledge of those assets, revenues, or receipts to secure the obligations with respect to which the swap agreement is entered.
N.C. Gen. Stat. § 159-195