Basic Knowledge Questions About Wire And Cable

1. What Kinds Of Wires And Cables Are Commonly Used According To Their Purpose?

Answer: According to their use, wires and cables can be divided into bare wire, insulated wire, heat-resistant wire, shielded wire, power cables, control cables, communication cables, radio frequency cables, among others.

2. What Types Of Insulated Wires Are There?

Answer: The most common types of insulated wires include; flexible wire, PVC flexible cable, rubber insulated wire, agricultural, underground direct buried aluminum cable, rubber insulated cable,  PVC insulated wire, and PVC insulated cable. 

3. What Kind Of Occasions Is The Cable Tray Suitable For?

Answer: Cable bridges are suitable for general industrial and mining enterprises indoor and outdoor overhead laying of power cables, control cables. They are also ideal for telecommunications, radio, and television departments in indoor and outdoor erection.

4. What Are Cable Accessories?

Answer:  The most commonly used electrical wire and cable accessories include cable terminal junction boxes, cable intermediate junction boxes, connection tubes and terminals, steel plate junction channels, cable bridges, among others.

5. What Are Cable Intermediate Joints?

Answer:  Cable intermediate joints are cable line connection devices that connect the cable and cable conductor and the insulation shield and protection layer.

6. What Is Mains Electrical Wiring?

Answer:  Mains electrical wiring refers to a power plant electrical installation, substation in the leading electrical equipment, and busbar connection, including the primary cable and wire busbar and plant power system according to specific functional requirements of the connection.

7. What Principles Should One Follow When Choosing An Ideal Power Cable Cross-Section?

Answer: You should follow the following principles when selecting an ideal power cable cross-section;

• 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
• The continuous allowable current of the cable should be equal to or greater than the maximum constant current of the supply load
• The core cross-section should meet the requirements of the stability of the power supply system in the event of a short circuit
• Verify that the voltage drop meets the requirements according to the length of the cable.
• The minimum short-circuit current at the end of the line should enable the protective device to act reliably

8. What Are The Advantages Of XLPE Cables Compared With Oil-Paper Cables?

Answer:

• It is easy to install because it allows a small minimum bending radius and lightweight.
• It is not limited by line drop.
• It has good thermal performance thus, allowing high operating temperatures and high transmission capacity.
• Simple wire and cable accessories, all of which are of dry construction
• Simple operation and maintenance, no oil leakage problems
• It is cheap
• High reliability and low failure rate
• The manufacturing process is less complex, and it has significant economic benefits

9. What Are The Requirements For Clamps For Fixing AC Single-Core Cables? Why Are Such Requirements Necessary?

Answer: The main requirement is that iron should not be used as a fixture for single-core AC cables. When current flows through the single-core AC cable, magnetic forces are formed around it.

Generally, the magnetic force produced is proportional to the amount of current transmitted through the single-core AC cable.  If you were to use iron or any other magnetic materials, the electromagnetic induction would produce eddy currents. These eddy currents will make the cable hot or even burn the cable.

10. What Is The Most Critical Feature Of Accessories For Heat Shrinkable Cable Heads?  What Are The Advantages Of This Feature?

Answer: The most crucial feature of the heat-shrinkable accessories is that the traditional stress cone is replaced by a stress tube. It not only simplifies the construction process but also reduces the size of the terminal of the joint.

Its advantages include the fact that it makes installation easy, saves time and labor, has superior performance, and saves metal. Essentially, the heat-shrinkable wire and cable attachment combine the advantages of both the potted and dry pack types.