Electrical and mechanical installation is a large-scale engineering project. Some large enterprises require nearly half a year to complete a single project. Moreover, the technical requirements for installation are quite substantial. The scope of the project includes boilers, ventilation and air conditioning, refrigeration, electrical, instruments, motors, compressor units, as well as broadcasting, film, and television control equipment. The qualification standards for electrical and mechanical installation engineering general contracting enterprises are divided into Level One, Level Two, and Level Three.

The scope of the electromechanical installation professional contracting qualification includes:

Top-tier Qualification: Capable of handling the installation of equipment, wiring, and pipelines for various construction projects, as well as 35kV and below substation engineering, and the manufacturing and installation of non-standard steel structural components.

Level II Qualification: Able to undertake installation of equipment, wiring, and pipelines for construction projects with a contract amount of less than 20 million yuan, engineering projects for substation and transformer stations with voltage below 10 kV, and manufacturing and installation of non-standard steel structural components.

Level 3 Qualification: Capable of undertaking installation of equipment, wiring, and pipelines for various construction projects with a contract amount of less than 10 million yuan, as well as manufacturing and installation of non-standard steel structural components.