N.C. Gen. Stat. § 159-27.1
The finance officer of a unit shall deposit any funds received by the unit as a reimbursement of a loan or advance made by the unit pursuant to G.S. 159-83(a)(8a) in the fund from which the unit originally derived the funds to make the loan or advance.
If the funds originally loaned or advanced were proceeds of a bond issue, any funds received as reimbursement shall be applied as required by this section. The funds shall be applied as provided in the instrument securing payment of the bond issue if the instrument contains applicable provisions. Otherwise, the funds shall be applied to either (i) the same general purposes as those for which the bond issue was authorized, or (ii) payment of debt service on the bond issue, including principal, interest, and premium, if any, upon redemption, or payment of the purchase price of bonds for retirement at not more than their face value and accrued interest. After all the bonds of the issue have been paid or satisfied in full, any funds received as reimbursement shall be deposited in the general fund of the unit and may be used for any general fund purpose.
N.C. Gen. Stat. § 159-27.1