N.C. Gen. Stat. § 58-72-30
Every surety on an official bond required by law to be taken or renewed and approved by the board of commissioners shall take and subscribe an oath before the chairman of the board or some person authorized by law to administer an oath, that he is worth a certain sum (which shall be not less than one thousand dollars ($1,000)) over and above all his debts and liabilities and his homestead and personal property exemptions, and the sum thus sworn to shall in no case be less in the aggregate than the penalty of the bond. But nothing herein shall be construed to abridge the power of the said board of commissioners to require the personal presence of any such surety before the board when the bond is offered, or at such subsequent time as the board may fix, for examination as to his financial condition or other qualifications as surety.
N.C. Gen. Stat. § 58-72-30