Wire and cable knowledge
Wire and cable question and answer
There are many types of wires and cables. We still need to understand the common wires and cables. The following is a general knowledge of wires and cables. We hope to help you.
1. What types of commonly used wires and cables are divided by purpose?
Answer: According to purpose, it can be divided into bare wire, insulated wire, heat-resistant wire, shielded wire, power cable, control cable, communication cable, and radio frequency cable.
2. What are the types of
insulated wires?
Answer: The usually insulated wires are the following: PVC insulated wire, PVC insulated cord, nitrile PVC mixture insulated cord, rubber insulated wire, agricultural buried aluminum core plastic insulated wire, rubber insulated cotton yarn Textile cords, PVC insulated nylon sheathed wires, PVC insulated cords for power and lighting, etc.
3, cable bridge for what kind of occasion?
Answer: Cable trays are suitable for the general laying of power cables and control cables for indoor and outdoor use by industrial and mining companies. They can also be used for indoor and outdoor installations in telecommunications, broadcasting and television departments.
What are the cable accessories?
Answer: The commonly used electrical accessories include cable terminal junction boxes, cable intermediate junction boxes, connecting pipes and terminals, steel wiring slots, and cable trays.
5, what is the cable middle connector?
Answer: The device that connects the cable to the cable conductor, insulation shield and protective layer to connect the cable line is called the cable middle connector.
6, what is the main electrical wiring?
Answer: The main electrical connection is the connection mode of the main electrical equipment and busbars in power plants and substations, including the main busbars and plant power systems according to certain functional requirements.
7. What rules should be followed when selecting the section of a power cable?
A: The selection of power cables should follow the following principles:
(1) The rated voltage of the cable shall 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 shall be equal to or greater than the maximum continuous current of the supply load;
(3) The cross-section of the core must meet the requirements for the stability of the short circuit of the power supply system;
(4) Verify that the voltage drop meets the requirements based on the length of the cable;
(5) The minimum short-circuits current at the end of the line should enable the protection device to operate reliably.
8. What are the advantages of cross-linked polyethylene cable and oil-paper cable?
A: (1) Easy to install because it allows a small minimum bending radius and lightweight;
(2) Not subject to line drop restrictions;
(3) Good thermal performance, allowing high operating temperature and large transmission capacity;
(4) The cable accessories are simple and all have a dry structure;
(5) Simple operation and maintenance, no oil leakage problem;
(6) Lower prices;
(7) High reliability and low failure rate;
(8) The manufacturing process is small, the process is simple, and the economic benefits are significant.
The above is a few questions about wire and cable common sense. If you have any questions when purchasing wires and cables, please contact us!
