N.J. Stat. § 18A:9-6
Except as provided below, if the board of education of a type II local school district shall so determine by resolution, or if a petition is filed with the board requesting the submission of the question to the voters, signed by 15% or more of the number of legally qualified voters who voted in the district at the last preceding general election held for the election of all of the members of the general assembly, the question shall be submitted to the voters of the district at the next annual school election of the district which will be held at least 15 days after the adoption of the resolution or the filing of the petition but if in the petition it is requested that the question be submitted at a special school election and the first annual school election to be held in the district after the petition is filed will be held less than 20 days or more than 50 days thereafter, the board shall forthwith call a special school election in the district, for the submission of the question, to be held not more than 50 days after the filing of the petition. No resolution may be adopted and no petition may be filed for the submission of the question of acceptance of N.J.S. 18A:9-2 within four years after an election shall have been held pursuant to any resolution adopted, or petition filed, pursuant to this section or N.J.S. 18A:9-4.
N.J.S. § 18A:9-6