Each emergency ordinance or resolution shall determine that it is necessary for the immediate preservation of the public peace, health or safety and shall contain a statement of the necessity for such emergency. Each emergency ordinance or resolution shall require the affirmative vote of at least two-thirds of the members elected to Council for its enactment; provided that if it fails to receive the requisite two-thirds affirmative vote, but receives the necessary majority for passage as a non-emergency ordinance or resolution, it shall be considered passed as such and shall become effective as provided in Section 14 of this Article. No action of the Council granting any franchise shall ever be passed as an emergency.