1.What types of commonly used wires and cables are used according to their purpose?

A: According to the use, it can be divided into bare wire, insulated wire, heat-resistant wire, shielded wire, power cable, control cable, communication cable, RF cable, etc.

2.What kinds of insulated wires are there?

A: There are commonly used insulated wires: polyvinyl chloride insulated wire, PVC insulated cord, PVC hybrid insulated cord, rubber insulated wire, agricultural underground direct buried aluminum core plastic insulated wire, rubber insulated cotton yarn Textile cord, PVC insulated nylon sheathed wire, PVC insulated cord for power and lighting, etc.

3.What regulations should be followed when selecting the cross section of a power cable?

A：The selection of power cables should follow the following principles:

（1）The rated voltage of the cable is greater than or equal to the rated voltage of the power supply system at the installation point； 

（2）The continuous allowable current of the cable should be equal to or greater than the maximum continuous current of the power supply load;

（3）The core section must meet the stability requirements of the short circuit of the power supply system

（4）Check if the voltage drop meets the requirements according to the cable length

（5）The minimum short-circuit current at the end of the line should enable reliable operation of the protection device

Unfinished......