N.J. Stat. Ann. § 18A:21-4

A board of education may in any school year draw against its capital reserve account, up to the amount of the balance therein, to the extent that the withdrawal is anticipated as a revenue in the school budget for the then current school year or approved by the commissioner for good cause; provided, that no money drawn from the account may be used for current expenses of the general fund or debt service payments but shall be used exclusively for capital expenses of the general fund or capital projects fund when expressly authorized as part of a referendum, except as provided for in section 2 of P.L.2018, c.90 (C.18A:18A-60).