(a) General rule.--Except as may otherwise be provided in this subpart, all ordinances shall be adopted and published as provided by law. Any ordinance may incorporate by reference any standard technical regulation or code, official or unofficial, which need not be so published whenever ten copies of the regulations or code have been placed on file in the office of the municipal clerk or secretary and in the office of the body or department charged with the enforcement of the ordinance. (b) Effective date.--No ordinance, other than the local budget ordinance, shall take effect less than ten days after its final passage by council and approval by the executive (mayor) where that approval is required, unless the council adopts a resolution declaring an emergency and at least a majority plus one of all the members of the council vote in favor of the resolution.
Pennsylvania Legal Code