All primaries and elections in this Commonwealth shall be conducted by ballot, except in districts in which voting machines are used under the provisions of Article XI of this act.¹ All ballots used at primaries and elections in election districts in which ballots are used, shall be provided by the respective county boards of elections, in accordance with the provisions of this act, and, except as otherwise provided in this act, only official ballots furnished by the county boards of elections shall be cast or counted at any primary or election in any district in which ballots are used.