Regulations for Implementing Labor-Management Meeting Article 6

When the number of employees of any single gender is more than one half of the total number of employees, the number of labor representatives for the gender shall not be less than one-third of the total number of representatives.The number of alternate representatives for the labor side shall not exceed the number of representatives elected.When a seat of representative for the labor side is vacant, an alternate representative shall fill in the vacancy without being subject to the restrictions prescribed in Paragraph 1.
中文原文 勞資會議實施辦法第6條
事業單位單一性別勞工人數逾勞工人數二分之一者,其當選勞方代表名額不得少於勞方應選出代表總額三分之一。
勞資會議勞方代表之候補代表名額不得超過應選出代表總額。
勞資會議勞方代表出缺時,由候補代表遞補之;其遞補順序不受第一項規定之限制。

English translation for reference only; the Chinese text prevails. Not legal advice.