(a) Except an ordinance granting a franchise, the following ordinances shall take effect immediately:
- (1) Those calling or otherwise relating to an election.
- (2) Those specifically required by law to take immediate effect.
- (3) Those fixing the amount of money to be raised by taxation or the rate of taxes to be levied.
- (4) Those for the immediate preservation of the public peace, health, or safety. The ordinances referred to in this subdivision shall contain a declaration of the facts constituting the necessity and shall be passed by a four-fifths vote of the board of supervisors.
- (b) All other ordinances, including ordinances granting a franchise, shall become effective 30 days from and after the date of final passage.