1. should have basic knowledge of electrical principles, principles and applications of common electrical appliances in factories.

2. Understand the use and maintenance of commonly used electrical measuring instruments, tools and protective appliances in the electrical wiring diagram.

3. Installation, laying and maintenance of indoor lines, overhead lines and cables, types, selection and connection methods of commonly used wires.

4. Types, uses, operation control, maintenance, installation and overhaul of AC asynchronous motors.

5. Common power transformation and distribution equipment and control low-voltage appliances, as well as the safe operation of power transformation and distribution stations.

6. Electric shock first aid.

7. Transistor polarity and parameter test, transistor circuit application.

8. Applications of other electrical equipment (hand-held power tools, welding equipment), etc.

Extended data

Numerical control machine tool is the abbreviation of computer numerical control machine tool, which is an automatic machine tool with program control system.

The control system can use control codes or other symbolic instructions to logically process, decode and express the program with coded numbers, and input it into the numerical control device through the information carrier. After the operation, the numerical control device sends out various control signals to control the action of the machine tool, and automatically processes the parts according to the shape and size required by the drawings.

reference data

Baidu encyclopedia-numerical control machine tool