N.H. Rev. Stat. Ann. § 33:6

Upon recommendation of the commissioner of revenue administration, approved by the governor and council, municipalities and counties may, within such limits as to amount, term and rate of interest as may be prescribed by the commissioner of revenue administration, incur debt outside the debt limit prescribed by RSA 33:4 for purposes made necessary by war or other national or local disaster or emergency. Such debt shall at no time be included in the net indebtedness of the municipality or county for the purpose of determining its borrowing capacity.