Occupational Safety and Health Act Article 19

(Ⅰ)The employers shall not have laborers work in a high temperature worksite for more than six hours each day; employers shall reduce working hours for laborers performing work under abnormal atmospheric pressure conditions, elevated operation, high precision operation, high physical exertion, or other specially hazardous tasks, and give appropriate rest periods during working hours.(Ⅱ)The standards for the preceding paragraph describing the reduction of working hours and adequate time for rest for working under unusually high temperature, abnormal atmospheric pressure, elevated operation, high precision operation, high physical exertion, and other specially hazardous tasks shall be stipulated by the Central Competent Authority in coordination with relevant authorities.
中文原文 職業安全衛生法第19條
在高溫場所工作之勞工,雇主不得使其每日工作時間超過六小時;異常氣壓作業、高架作業、精密作業、重體力勞動或其他對於勞工具有特殊危害之作業,亦應規定減少勞工工作時間,並在工作時間中予以適當之休息。
前項高溫度、異常氣壓、高架、精密、重體力勞動及對於勞工具有特殊危害等作業之減少工作時間與休息時間之標準,由中央主管機關會同有關機關定之。

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