20. Notwithstanding the second paragraph of section 3, the plan applies to employees and persons referred to in Schedule II who were appointed or engaged to hold, with the corresponding classification, non-unionizable employment designated in Schedule I and who are members of a supplemental pension plan with regard to an employer party to this plan, if the employees holding, with the corresponding classification, non-unionizable employment corresponding to at least 40 % of the regular time of an employee holding full-time non-unionizable employment have elected to be members of this plan by a poll held in accordance with sections 6 and 7 of the Act respecting the Government and Public Employees Retirement Plan (chapter R-10).
The plan applies to the extent provided for in this chapter from the date determined in section 8 of the said Act.