The employer may require his employees to work on any day:
(a) In case of actual or impending emergencies caused by serious accident, fire, flood, typhoon, earthquake, epidemic or other disaster or calamity to prevent loss of life and property, or imminent danger to public safety;
(b) In cases of urgent work to be performed on the machinery, equipment, or installation, to avoid serious loss which the employer would otherwise suffer;
(c) In the event of abnormal pressure of work due to special circumstances, where the employer cannot ordinarily be expected to resort to other measures;
(d) To prevent loss or damage to perishable goods;
(e) Where the nature of the work requires continuous operations and the stoppage of work may result in irreparable injury or loss to the employer; and
(f) Under other circumstances analogous or similar to the foregoing as determined by the Secretary of Labor and Employment.