I already looked into it when I was A1.

Who is covered under Part IV
Part IV of the Employment Act, which provides for rest days, hours of work and other conditions of service, only applies to:

A workman (doing manual labour) earning a basic monthly salary of not more than $4,500.
An employee who is not a workman, but who is covered by the Employment Act and earns a monthly basic salary of not more than $2,600.

Part IV of the Act does not cover all managers or executives.