Conn. Gen. Stat. § 5-275

(b) The board shall determine the appropriateness of a unit which shall be the public employer unit or a subdivision thereof. In determining the appropriateness of the unit, the board shall: (1) Take into consideration, but shall not limit consideration to, the following: (A) Public employees must have an identifiable community of interest, and (B) the effects of overfragmentation; (2) not decide that any unit is appropriate if (A) such unit includes both professional and nonprofessional employees, unless a majority of such professional employees vote for inclusion in such unit, or (B) such unit includes both Department of Correction employees at or above the level of lieutenant and Department of Correction employees below the level of lieutenant; (3) take into consideration that when the state is the employer, it will be bargaining on a state-wide basis unless issues involve working conditions peculiar to a given governmental employment locale; (4) permit the faculties of (A) The University of Connecticut, (B) the Connecticut State University System, and (C) the Technical Education and Career System to each comprise a separate unit, which in each case shall have the right to bargain collectively with their respective boards of trustees or their designated representatives; and (5) permit the community college faculty and the technical college faculty as they existed prior to July 1, 1992, to continue to comprise separate units, which in each case shall have the right to bargain collectively with its board of trustees or its designated representative. Nonfaculty professional staff of the above institutions may by mutual agreement be included in such bargaining units, or they may form a separate bargaining unit of their own. This section shall not be deemed to prohibit multiunit bargaining.

(c) An employee organization or an employer may file a petition with the board seeking a clarification or modification of an existing unit. The power of the board to make such clarifications and modifications shall be limited to those times when a petition for clarification or modification is filed by either an employee organization or an employer. No petition seeking a clarification or modification of an existing unit shall be considered to be timely by the board during the term of a written collective bargaining agreement, except that a petition for clarification or modification filed by an employee organization concerning either (1) a newly created position or (2) any employee who is not represented by an employee organization, may be filed at any time.

Cited. 183 C. 235.