24 Pa. Stat. § 6-634
Any school district having no indebtedness, or whose indebtedness, incurred or created without the assent of the electors thereof, is less than five (5) per centum of the total valuation of property taxable for school purposes therein, may, at any time, for the purpose of providing funds in any fiscal year for current expenses and debt service, for permanent improvements, the acquiring of school buses, or in anticipation of proceeds from a bond issue already officially authorized and (except in school districts of the first class) approved by the Department of Community Affairs, with such limitations and for such length of term as hereinafter provided, by or through its board of school directors, incur, in addition to any bonds therein authorized, a temporary debt, or borrow money, and issue an obligation or obligations therefor, under the seal of the district, if any, properly executed by the president and attested by the secretary thereof, and bearing interest not exceeding the legal rate, but no such obligation shall be sold for less than par. The incurring of any such temporary debt, or borrowing money upon such obligation, shall receive the affirmative vote of not less than two-thirds of the members of the board of school directors therein.
In addition thereto, any school district may, as hereinbefore provided, incur a temporary debt or borrow money for permanent improvements, where no bond issue has been previously officially authorized, and refund such temporary indebtedness by the issue of bonds, in the manner provided by law, when the exact amount required for such permanent improvement becomes known.
24 P.S. § 6-634