School bonds may be authorized and issued in the manner prescribed in section 18A:24-21, notwithstanding the provisions of section 18A:24-19, by, or for the purposes of, any district other than a regional district, within the limitations and upon compliance with the provisions of this article to the extent that the percentage of net debt as stated in a supplemental debt statement required to be filed as to such authorization, and prior thereto, shall not exceed 3 1/2 %.
N.J.S. § 18A:24-20