(iii)The total daily hours of work shall not exceed 10 with a spread over of 12 hours except in an emergency when it is necessary to employ a shift worker for more than 8 hours in any day to enable him to work whole or part of the subsequent shift. In no case shall the worker be employed for more than 16 hours in a period of 24 hours from the commencement of work, and the total number of hours of overtime shall also not exceed 50 in any quarter:
