(a) Submission.--Except as provided in subsection (b), a proposed ordinance may be submitted to council by a petition signed by the electors of a city in accordance with this subchapter.
(b) Exclusions.--The following proposed ordinances may not be submitted by petition to council in accordance with this subchapter:
(1) Proposed ordinances dealing with the subjects set forth in section 11050(b) (relating to time ordinances go into effect).
(2) Proposed ordinances to repeal, amend or modify an ordinance which took effect after having been subject to the provisions of the referendum for reconsideration of the ordinance.