Even though the industry you may be in is what is known as "24/7", this makes no difference. The maximum normal time remains at 45 hours weekly and the maximum overtime remains at 10 hours weekly. In addition, the Basic Conditions of Employment Act provides for a daily rest period of 12 consecutive hours between finishing work and recommencing work, and provides for a weekly rest period of at least 36 consecutive hours which, unless otherwise agreed, must include a Sunday.
Thus, it is obvious that, from the above, it is unlawful for an employer to force an employee to work a full shift of say 9 hours, and then be on "standby" for the next 12 hours - to do so would violate the condition regarding the daily rest period. Employees in the so-called "24/7" type of industry such as hospitality and IT, are still subject to the 45/10 rule.