The main contractor and the sub-contractor who are under the labour protection law are obligated to carry out an operation on occupational safety, health and environment in the same as an Employer does.
Whereas an Employer, who is the sub-contractor, has the next sub-contractor. All the next sub-contractors and the main contractor whose Employees work in the same establishment are obligated to collaborate in keeping a workplace in safe working condition and hygienic working environment in order to provide safety for the Employee