Conn. Gen. Stat. § 7-214: Requirements for exercise of authority.

No municipality shall exercise the authority conferred in section 7-213 until affirmative action for that purpose has been taken by its legislative body by a two-thirds vote of those present at a legal meeting, received the approval of the chief executive officer and thereafter been ratified by a majority of the electors voting thereon at the regular municipal election in the manner prescribed by section 9-369 at which not less than fifteen per cent of the electors have voted. When such vote fails to secure ratification, no similar vote shall be submitted for ratification until after the expiration of one year.