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

Answer: According to their purposes, they can be divided into bare wires, insulated wires, heat-resistant wires, shielded wires, power cables, control cables, communication cables, RF cables, etc.

2. What are the types of insulated wires?

Answer: There are several types of insulated wires commonly used, including polyvinyl chloride insulated wires, polyvinyl chloride insulated flexible wires, nitrile polyvinyl chloride mixture insulated flexible wires, rubber insulated wires, agricultural underground buried aluminum core plastic insulated wires, rubber insulated cotton yarn textile flexible wires, polyvinyl chloride insulated nylon sheathed wires, and polyvinyl chloride insulated flexible wires for power and lighting.

3. What occasions are cable trays suitable for?

Answer: Cable trays are suitable for overhead laying of power cables and control cables indoors and outdoors in general industrial and mining enterprises. They can also be used for indoor and outdoor installation in telecommunications, broadcasting and television departments.

4. What are the cable accessories?

Answer: Common electrical accessories include cable terminal junction boxes, cable intermediate junction boxes, connecting pipes and terminals, steel plate wiring troughs, cable trays, etc.

5. What is a cable intermediate joint?

Answer: The device that connects the conductors, insulation shielding layers, and protective layers of cables to connect cable lines is called a cable intermediate joint.

6. What is electrical main wiring?

Answer: The main electrical wiring is the connection method of the main electrical equipment and busbar in power plants and substations, including the connection method of the main busbar and the plant power system according to certain functional requirements.

7. What regulations should be followed when selecting the cross-section of power cables?

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

(1) The rated voltage of the cable should be 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 cross-sectional area of the wire core should meet the stability requirements of the power supply system during a short circuit;

(4) Verify whether the voltage drop meets the requirements based on the length of the cable;

(5) The minimum short-circuit current at the end of the line should enable the protection device to operate reliably.

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