1, some commonly used national standard, industry standard and professional standard code

2, commonly used international standards and foreign standard code

3. Letter symbols and their meanings

4. Cable cover type and its meaning

5. Common cable structure calculation

1) Circular single wire: circular single wire is a single round wire that is not covered with other metal layers.

2) Area S of a circle single line

PI.

S = -- d2 (mm2)

4

3) Circle single line perimeter L

L = πd (mm)

6, enameled wire varieties, characteristics and uses

7. Varieties, characteristics and uses of special winding wires

8. Code and meaning of each part of the wire and cable product model for electrical equipment

9, general rubber plastic wire use requirements and structural characteristics

10, general rubber plastic flexible wire requirements and structural characteristics

11. Requirements and structural characteristics of shielded insulated wire and cable

12. Requirements and structural characteristics of shielded insulated wire and cable

13, mining cable use requirements and structural characteristics

14, seismic cable use requirements and structural characteristics

15, drilling cable use requirements and structure

16, elevator cable use requirements and structural characteristics

17, control signal cable use requirements and structural characteristics

18. Requirements and structural characteristics of DC high-voltage cables

19. Classification and characteristics of optical cable

20, cable according to the use of environment

21. Types, forms and uses of cable core conductor materials and metal shielding materials