Special types of work refers to the job category of personnel engaged in special operations collectively, is prone to casualties, the operation of their own, others and the surrounding facilities of the safety of the major hazards of the types of work. The former Ministry of Labor will be engaged in underground, high altitude, high temperature, extra heavy physical labor or other jobs harmful to health as a special type of work and make clear that the scope of the special types of work by the competent authorities of the industry or the labor department to determine. Such as: welders, electricians, boilermakers, drivers, heavy lifters and so on.