Section 25306 Of Article 1. Establishment From California Public Utilities Code >> Division 10. >> Part 1. >> Chapter 5. >> Article 1.

. The board may classify and determine the officers and employees who shall be included as members in the retirement system and may change the classification from time to time. Membership of all officers and employees so classified and included in the retirement system is compulsory. The retirement system shall not apply to elective officers.