Following are some Q&A people interested in wire and cables:
1. What types of commonly used wires and cables are classified by purpose?
Answer: According to the purpose, it can be divided into bare conductors, insulated wires, heat-resistant wires, shielded wires, power cables, control cables, communication cables, radio frequency cables, etc.
2. What is the difference between ACSR cable and AAAC cable?
Answer: AAAC: This bare concentric-lay-stranded conductor, made from round aluminum alloy 6201 -T81 wires, is constructed with a central core surrounded by one or more layers of helically laid wires. It provides better corrosion resistance than the one produced by the aluminum conductor steel reinforced(ACSR).
ACSR: This bare concentric-lay-stranded conductor is made from round aluminum 1350-H19 (extra hard) wires and round zinc-coated or aluminum-coated steel core wire(s) to be used as overhead electrical conductors. It provides better strength than AAAC cable.
3. What kinds of insulated wires are there?
Answer: There are the following types of insulated wires: PVC insulated wires, PVC insulated cords, nitrile and polyvinyl chloride compound insulated cords, rubber insulated wires, direct buried aluminum core plastic insulated wires for agricultural use, and rubber insulated cotton yarn Textile cords, PVC insulated nylon sheathed wires, PVC insulated cords for power and lighting, etc.
4. What kind of occasion is the cable tray suitable for?
Answer: The cable tray is suitable for the overhead laying of power cables and control cables indoors and outdoors in general industrial and mining enterprises, and can also be used for indoor and outdoor installations in telecommunications, radio, and television departments.
5. What are the cable accessories?
Answer: Commonly used electrical accessories include cable terminal junction boxes, cable intermediate junction boxes, connecting pipe and terminal blocks, steel plate junction boxes, cable trays, etc.
6. What is the cable middle connector?
Answer: The device that connects the cable and the cable’s conductor, insulation shielding layer, and protective layer to connect the cable line is called the cable intermediate joint.
7. What is electrical main wiring?
Answer: The electrical main wiring is the connection method of the main electrical equipment and the bus in power plants and substations, including the connection of the main bus and the auxiliary power system according to certain functional requirements.
8. When choosing the cross-section of the power cable, which regulations should be followed?
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-section of the core must meet the requirements of stability of the power supply system when it is short-circuited.
(4) Check whether 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 the protection device to operate reliably.
9. What are the advantages of XLPE cables and oil-paper cables?
(1) Easy to install, because it allows a small minimum bending radius and is lightweight.
(2) Not restricted by line drop.
(3) Good thermal performance, high allowable working temperature, and large transmission capacity.
(4) The cable accessories are simple and all are dry structures.
(5) Simple operation and maintenance, no oil leakage problem.
(6) The price is lower.
(7) High reliability and low failure rate.
(8) There are few manufacturing procedures, simple processes, and remarkable economic benefits.
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