N.C. Gen. Stat. § 159-60
A petition demanding that a bond order be submitted to the voters may be filed with the clerk within 30 days after the date of publication of the bond order as introduced. The petition shall be in writing, and shall be signed by a number of voters of the issuing unit equal to not less than ten percent (10%) of the total number of voters registered to vote in elections of the issuing unit according to the most recent figures certified by the Board of Elections. The residence address of each signer shall be written after his signature. The petition need not contain the text of the order to which it refers, and need not be all on one sheet.
The clerk shall investigate the sufficiency of the petition and present it to the governing board, with a certificate stating the results of his investigation. The governing board, after hearing any taxpayer who may request to be heard, shall thereupon determine the sufficiency of the petition, and its determination shall be conclusive.
This section does not apply to bonds issued pursuant to G.S.159-48(a)(1), (2), (3), or (5).
N.C. Gen. Stat. § 159-60